753 lines
17 KiB
C
753 lines
17 KiB
C
/******************************************************************//**
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* @file drv_iic.c
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* @brief Serial API of RT-Thread RTOS for EFM32
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* COPYRIGHT (C) 2011, RT-Thread Development Team
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* @author onelife
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* @version 0.4 beta
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**********************************************************************
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* @section License
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* The license and distribution terms for this file may be found in the file LICENSE in this
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* distribution or at http://www.rt-thread.org/license/LICENSE
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**********************************************************************
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* @section Change Logs
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* Date Author Notes
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* 2011-01-06 onelife Initial creation for EFM32
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* 2011-06-17 onelife Modify init function for efm32lib v2 upgrading
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*********************************************************************/
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/******************************************************************//**
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* @addtogroup efm32
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* @{
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*********************************************************************/
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/* Includes -------------------------------------------------------------------*/
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#include "board.h"
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#include "hdl_interrupt.h"
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#include "drv_iic.h"
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#if (defined(RT_USING_IIC0) || defined(RT_USING_IIC1))
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/* Private typedef -------------------------------------------------------------*/
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/* Private define --------------------------------------------------------------*/
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/* Private macro --------------------------------------------------------------*/
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#ifdef RT_IIC_DEBUG
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#define iic_debug(format,args...) rt_kprintf(format, ##args)
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#else
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#define iic_debug(format,args...)
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#endif
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/* Private variables ------------------------------------------------------------*/
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#ifdef RT_USING_IIC0
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#if (RT_USING_IIC0 > 3)
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#error "The location number range of IIC is 0~3"
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#endif
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struct rt_device iic0_device;
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static struct rt_device iic0_rx_index;
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#endif
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#ifdef RT_USING_IIC1
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#if (RT_USING_IIC1 > 3)
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#error "The location number range of IIC is 0~3"
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#endif
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struct rt_device iic1_device;
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static struct rt_device iic1_rx_index;
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#endif
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/* Private function prototypes ---------------------------------------------------*/
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/* Private functions ------------------------------------------------------------*/
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/******************************************************************//**
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* @brief
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* Initialize IIC device
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*
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* @details
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*
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* @note
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*
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* @param[in] dev
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* Pointer to device descriptor
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*
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* @return
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* Error code
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*********************************************************************/
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static rt_err_t rt_iic_init (rt_device_t dev)
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{
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struct efm32_iic_device_t* iic;
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iic = (struct efm32_iic_device_t*)dev->user_data;
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if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
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{
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/* Enable IIC */
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I2C_Enable(iic->iic_device, true);
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iic->rx_buffer = RT_NULL;
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iic->state = 0;
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dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
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}
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return RT_EOK;
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}
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/******************************************************************//**
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* @brief
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* Open IIC device
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*
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* @details
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*
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* @note
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*
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* @param[in] dev
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* Pointer to device descriptor
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*
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* @param[in] oflag
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* Device open flag
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*
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* @return
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* Error code
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*********************************************************************/
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static rt_err_t rt_iic_open(rt_device_t dev, rt_uint16_t oflag)
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{
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RT_ASSERT(dev != RT_NULL);
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iic_debug("IIC: Open with flag %x\n", oflag);
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return RT_EOK;
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}
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/******************************************************************//**
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* @brief
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* Close IIC device
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*
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* @details
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*
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* @note
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*
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* @param[in] dev
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* Pointer to device descriptor
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*
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* @return
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* Error code
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*********************************************************************/
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static rt_err_t rt_iic_close(rt_device_t dev)
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{
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struct efm32_iic_device_t *iic;
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iic = (struct efm32_iic_device_t *)(dev->user_data);
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rt_free(iic->rx_buffer->data_ptr);
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rt_free(iic->rx_buffer);
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iic->rx_buffer = RT_NULL;
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return RT_EOK;
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}
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/******************************************************************//**
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* @brief
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* Read from IIC device
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*
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* @details
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*
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* @note
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*
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* @param[in] dev
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* Pointer to device descriptor
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*
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* @param[in] pos
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* Offset
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*
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* @param[in] buffer
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* Poniter to the buffer
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*
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* @param[in] size
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* Buffer size in byte
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*
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* @return
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* Error code
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*********************************************************************/
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static rt_size_t rt_iic_read (
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rt_device_t dev,
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rt_off_t pos,
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void* buffer,
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rt_size_t size)
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{
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rt_err_t err_code;
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rt_size_t read_size;
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struct efm32_iic_device_t* iic;
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I2C_TransferSeq_TypeDef seq;
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I2C_TransferReturn_TypeDef ret;
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rt_uint8_t data[1];
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if (!size)
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{
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return 0;
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}
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err_code = RT_EOK;
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read_size = 0;
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iic = (struct efm32_iic_device_t*)dev->user_data;
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data[0] = (rt_uint8_t)(pos & 0x000000FF);
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if (iic->state & IIC_STATE_MASTER)
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{
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seq.addr = iic->slave_address;
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seq.flags = I2C_FLAG_WRITE_READ;
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/* Select register to be read */
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seq.buf[0].data = data;
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seq.buf[0].len = 1;
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/* Select location/length of data to be read */
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seq.buf[1].data = (rt_uint8_t *)buffer;
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seq.buf[1].len = size;
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/* Do a polled transfer */
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ret = I2C_TransferInit(iic->iic_device, &seq);
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while (ret == i2cTransferInProgress)
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{
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ret = I2C_Transfer(iic->iic_device);
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}
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if (ret != i2cTransferDone)
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{
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iic_debug("IIC0 read error: %x\n", ret);
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iic_debug("IIC0 read address: %x\n", seq.addr);
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iic_debug("IIC0 read data0: %x -> %x\n", seq.buf[0].data, *seq.buf[0].data);
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iic_debug("IIC0 read len0: %x\n", seq.buf[0].len);
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iic_debug("IIC0 read data1: %x -> %x\n", seq.buf[1].data, *seq.buf[1].data);
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iic_debug("IIC0 read len1: %x\n", seq.buf[1].len);
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err_code = (rt_err_t)ret;
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}
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else
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{
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read_size = size;
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iic_debug("IIC0 read size: %d\n", read_size);
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}
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}
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else
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{
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rt_uint8_t* ptr;
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ptr = buffer;
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/* interrupt mode Rx */
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while (size)
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{
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rt_base_t level;
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struct efm32_iic_int_mode_t *int_rx;
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int_rx = iic->rx_buffer;
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/* disable interrupt */
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level = rt_hw_interrupt_disable();
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if (int_rx->read_index != int_rx->save_index)
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{
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/* read a character */
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*ptr++ = int_rx->data_ptr[int_rx->read_index];
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size--;
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/* move to next position */
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int_rx->read_index ++;
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if (int_rx->read_index >= IIC_RX_BUFFER_SIZE)
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{
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int_rx->read_index = 0;
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}
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}
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else
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{
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/* set error code */
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err_code = -RT_EEMPTY;
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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break;
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}
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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}
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read_size = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
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iic_debug("IIC0 slave read size: %d\n", read_size);
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}
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/* set error code */
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rt_set_errno(err_code);
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return read_size;
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}
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/******************************************************************//**
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* @brief
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* Write to IIC device
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*
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* @details
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*
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* @note
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*
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* @param[in] dev
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* Pointer to device descriptor
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*
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* @param[in] pos
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* Offset
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*
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* @param[in] buffer
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* Poniter to the buffer
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*
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* @param[in] size
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* Buffer size in byte
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*
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* @return
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* Error code
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*********************************************************************/
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static rt_size_t rt_iic_write (
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rt_device_t dev,
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rt_off_t pos,
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const void* buffer,
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rt_size_t size)
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{
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rt_err_t err_code;
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rt_size_t write_size;
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struct efm32_iic_device_t* iic;
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I2C_TransferSeq_TypeDef seq;
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I2C_TransferReturn_TypeDef ret;
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//rt_uint8_t data[1];
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if (!size)
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{
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return 0;
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}
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err_code = RT_EOK;
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write_size = 0;
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iic = (struct efm32_iic_device_t*)dev->user_data;
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//data[0] = (rt_uint8_t)(pos & 0x000000FF);
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if (iic->state & IIC_STATE_MASTER)
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{
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seq.addr = iic->slave_address;
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if (pos != (rt_off_t)(-1))
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{
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seq.flags = I2C_FLAG_WRITE_WRITE;
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/* Select register to be write */
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seq.buf[0].data = (rt_uint8_t *)(pos & 0x000000FF);
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seq.buf[0].len = 1;
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/* Select location/length of data to be write */
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seq.buf[1].data = (rt_uint8_t *)buffer;
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seq.buf[1].len = size;
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}
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else
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{
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seq.flags = I2C_FLAG_WRITE;
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/* Select location/length of data to be write */
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seq.buf[0].data = (rt_uint8_t *)buffer;
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seq.buf[0].len = size;
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}
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}
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else
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{
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// TODO: Slave mode TX
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}
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/* Do a polled transfer */
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ret = I2C_TransferInit(iic->iic_device, &seq);
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while (ret == i2cTransferInProgress)
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{
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ret = I2C_Transfer(iic->iic_device);
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}
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if (ret != i2cTransferDone)
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{
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err_code = (rt_err_t)ret;
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}
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else
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{
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write_size = size;
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}
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/* set error code */
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rt_set_errno(err_code);
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return write_size;
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}
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/******************************************************************//**
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* @brief
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* Configure IIC device
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*
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* @details
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*
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* @note
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*
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* @param[in] dev
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* Pointer to device descriptor
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*
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* @param[in] cmd
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* IIC control command
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*
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* @param[in] args
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* Arguments
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*
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* @return
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* Error code
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*********************************************************************/
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static rt_err_t rt_iic_control (
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rt_device_t dev,
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rt_uint8_t cmd,
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void *args)
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{
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RT_ASSERT(dev != RT_NULL);
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struct efm32_iic_device_t *iic;
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iic = (struct efm32_iic_device_t*)dev->user_data;
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switch (cmd)
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{
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case RT_DEVICE_CTRL_SUSPEND:
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/* suspend device */
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dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
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I2C_Enable(iic->iic_device, false);
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break;
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case RT_DEVICE_CTRL_RESUME:
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/* resume device */
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dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
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I2C_Enable(iic->iic_device, true);
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break;
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case RT_DEVICE_CTRL_IIC_SETTING:
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{
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/* change device setting */
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struct efm32_iic_control_t *control;
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control = (struct efm32_iic_control_t *)args;
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iic->state = control->config & (IIC_STATE_MASTER | IIC_STATE_BROADCAST);
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iic->master_address = control->master_address << 1;
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iic->slave_address = control->slave_address << 1;
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if (!(iic->state & IIC_STATE_MASTER))
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{
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if (iic->rx_buffer == RT_NULL)
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{
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iic->rx_buffer = rt_malloc(sizeof(struct efm32_iic_int_mode_t));
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if (iic->rx_buffer == RT_NULL)
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{
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iic_debug("no memory for IIC RX structure\n");
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return -RT_ENOMEM;
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}
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/* Allocate RX buffer */
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if ((iic->rx_buffer->data_ptr = \
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rt_malloc(IIC_RX_BUFFER_SIZE)) == RT_NULL)
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{
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iic_debug("no memory for IIC RX buffer\n");
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rt_free(iic->rx_buffer);
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return -RT_ENOMEM;
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}
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rt_memset(iic->rx_buffer->data_ptr, 0, IIC_RX_BUFFER_SIZE);
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iic->rx_buffer->data_size = IIC_RX_BUFFER_SIZE;
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iic->rx_buffer->read_index = 0;
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iic->rx_buffer->save_index = 0;
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}
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/* Enable slave mode */
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I2C_SlaveAddressSet(iic->iic_device, iic->slave_address);
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I2C_SlaveAddressMaskSet(iic->iic_device, 0xFF);
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iic->iic_device->CTRL |= I2C_CTRL_SLAVE | I2C_CTRL_AUTOACK | I2C_CTRL_AUTOSN;
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/* Enable interrupts */
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I2C_IntEnable(iic->iic_device, I2C_IEN_ADDR | I2C_IEN_RXDATAV | I2C_IEN_SSTOP);
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I2C_IntClear(iic->iic_device, _I2C_IFC_MASK);
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/* Enable I2Cn interrupt vector in NVIC */
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#ifdef RT_USING_IIC0
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if (dev == &iic0_device)
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{
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NVIC_ClearPendingIRQ(I2C0_IRQn);
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NVIC_SetPriority(I2C0_IRQn, EFM32_IRQ_PRI_DEFAULT);
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NVIC_EnableIRQ(I2C0_IRQn);
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}
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#endif
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#ifdef RT_USING_IIC1
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if (dev == &iic1_device)
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{
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NVIC_ClearPendingIRQ(I2C1_IRQn);
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NVIC_SetPriority(I2C1_IRQn, EFM32_IRQ_PRI_DEFAULT);
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NVIC_EnableIRQ(I2C1_IRQn);
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}
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#endif
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}
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}
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break;
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}
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return RT_EOK;
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}
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/******************************************************************//**
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* @brief
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* Register IIC device
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*
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* @details
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*
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* @note
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*
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* @param[in] device
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* Pointer to device descriptor
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*
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* @param[in] name
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* Device name
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*
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* @param[in] flag
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* Configuration flags
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*
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* @param[in] iic
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* Pointer to IIC device descriptor
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*
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* @return
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* Error code
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*********************************************************************/
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rt_err_t rt_hw_iic_register(
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rt_device_t device,
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const char *name,
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rt_uint32_t flag,
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struct efm32_iic_device_t *iic)
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{
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RT_ASSERT(device != RT_NULL);
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if ((flag & RT_DEVICE_FLAG_DMA_TX) || (flag & RT_DEVICE_FLAG_DMA_RX) ||
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(flag & RT_DEVICE_FLAG_INT_TX))
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{
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RT_ASSERT(0);
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}
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device->type = RT_Device_Class_I2C;
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device->rx_indicate = RT_NULL;
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device->tx_complete = RT_NULL;
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device->init = rt_iic_init;
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device->open = rt_iic_open;
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device->close = rt_iic_close;
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device->read = rt_iic_read;
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device->write = rt_iic_write;
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device->control = rt_iic_control;
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device->user_data = iic;
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/* register a character device */
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return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
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}
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/******************************************************************//**
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* @brief
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* IIC slave mode RX data valid interrupt handler
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*
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* @details
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*
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* @note
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*
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* @param[in] dev
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* Pointer to device descriptor
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*********************************************************************/
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static void rt_hw_iic_slave_isr(rt_device_t dev)
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{
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struct efm32_iic_device_t *iic;
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struct efm32_iic_int_mode_t *int_rx;
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rt_uint32_t status;
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volatile rt_uint32_t temp;
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/* interrupt mode receive */
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RT_ASSERT(dev->flag & RT_DEVICE_FLAG_INT_RX);
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iic = (struct efm32_iic_device_t*)dev->user_data;
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int_rx = iic->rx_buffer;
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status = iic->iic_device->IF;
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|
|
if (status & I2C_IF_ADDR)
|
|
{
|
|
/* Address Match */
|
|
/* Indicating that reception is started */
|
|
temp = iic->iic_device->RXDATA & 0xFFUL;
|
|
if ((temp != 0x00) || (iic->state & IIC_STATE_BROADCAST))
|
|
{
|
|
iic->state |= IIC_STATE_RX_BUSY;
|
|
}
|
|
}
|
|
else if (status & I2C_IF_RXDATAV)
|
|
{
|
|
if (iic->state & IIC_STATE_RX_BUSY)
|
|
{
|
|
rt_base_t level;
|
|
|
|
/* disable interrupt */
|
|
level = rt_hw_interrupt_disable();
|
|
|
|
/* save character */
|
|
int_rx->data_ptr[int_rx->save_index] = \
|
|
(rt_uint8_t)(iic->iic_device->RXDATA & 0xFFUL);
|
|
int_rx->save_index ++;
|
|
if (int_rx->save_index >= IIC_RX_BUFFER_SIZE)
|
|
int_rx->save_index = 0;
|
|
|
|
/* if the next position is read index, discard this 'read char' */
|
|
if (int_rx->save_index == int_rx->read_index)
|
|
{
|
|
int_rx->read_index ++;
|
|
if (int_rx->read_index >= IIC_RX_BUFFER_SIZE)
|
|
{
|
|
int_rx->read_index = 0;
|
|
}
|
|
}
|
|
|
|
/* enable interrupt */
|
|
rt_hw_interrupt_enable(level);
|
|
}
|
|
else
|
|
{
|
|
temp = iic->iic_device->RXDATA;
|
|
}
|
|
}
|
|
|
|
if(status & I2C_IF_SSTOP)
|
|
{
|
|
/* Stop received, reception is ended */
|
|
iic->state &= ~(rt_uint8_t)IIC_STATE_RX_BUSY;
|
|
}
|
|
}
|
|
|
|
/******************************************************************//**
|
|
* @brief
|
|
* Initialize the specified IIC unit
|
|
*
|
|
* @details
|
|
*
|
|
* @note
|
|
*
|
|
* @param[in] unitNumber
|
|
* Unit number
|
|
*
|
|
* @param[in] location
|
|
* Pin location number
|
|
*********************************************************************/
|
|
static struct efm32_iic_device_t *rt_hw_iic_unit_init(
|
|
rt_device_t device,
|
|
rt_uint8_t unitNumber,
|
|
rt_uint8_t location)
|
|
{
|
|
struct efm32_iic_device_t *iic;
|
|
CMU_Clock_TypeDef iicClock;
|
|
I2C_Init_TypeDef init = I2C_INIT_DEFAULT;
|
|
efm32_irq_hook_init_t hook;
|
|
|
|
do
|
|
{
|
|
/* Allocate device */
|
|
iic = rt_malloc(sizeof(struct efm32_iic_device_t));
|
|
if (iic == RT_NULL)
|
|
{
|
|
iic_debug("no memory for IIC%d driver\n", unitNumber);
|
|
break;
|
|
}
|
|
iic->state |= IIC_STATE_MASTER;
|
|
iic->master_address = 0x0000;
|
|
iic->slave_address = 0x0000;
|
|
iic->rx_buffer = RT_NULL;
|
|
|
|
/* Initialization */
|
|
if (unitNumber >= I2C_COUNT)
|
|
{
|
|
break;
|
|
}
|
|
switch (unitNumber)
|
|
{
|
|
case 0:
|
|
iic->iic_device = I2C0;
|
|
iicClock = (CMU_Clock_TypeDef)cmuClock_I2C0;
|
|
break;
|
|
|
|
#if (I2C_COUNT > 1)
|
|
case 1:
|
|
iic->iic_device = I2C1;
|
|
iicClock = (CMU_Clock_TypeDef)cmuClock_I2C1;
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Enabling clock */
|
|
CMU_ClockEnable(iicClock, true);
|
|
|
|
/* Reset */
|
|
I2C_Reset(iic->iic_device);
|
|
|
|
/* Config GPIO */
|
|
GPIO_PinModeSet(
|
|
(GPIO_Port_TypeDef)AF_PORT(AF_I2C_SCL(unitNumber), location),
|
|
AF_PIN(AF_I2C_SCL(unitNumber), location),
|
|
gpioModeWiredAndPullUpFilter,
|
|
1);
|
|
GPIO_PinModeSet(
|
|
(GPIO_Port_TypeDef)AF_PORT(AF_I2C_SDA(unitNumber), location),
|
|
AF_PIN(AF_I2C_SDA(unitNumber), location),
|
|
gpioModeWiredAndPullUpFilter,
|
|
1);
|
|
|
|
hook.type = efm32_irq_type_iic;
|
|
hook.unit = unitNumber;
|
|
hook.cbFunc = rt_hw_iic_slave_isr;
|
|
hook.userPtr = device;
|
|
efm32_irq_hook_register(&hook);
|
|
|
|
/* Enable SDZ and SCL pins and set location */
|
|
iic->iic_device->ROUTE = I2C_ROUTE_SDAPEN | I2C_ROUTE_SCLPEN | \
|
|
(location << _I2C_ROUTE_LOCATION_SHIFT);
|
|
|
|
/* Initializing IIC */
|
|
init.enable = false;
|
|
I2C_Init(iic->iic_device, &init);
|
|
|
|
/* Abort current TX data and clear TX buffers */
|
|
iic->iic_device->CMD = I2C_CMD_ABORT | I2C_CMD_CLEARPC | I2C_CMD_CLEARTX;
|
|
|
|
return iic;
|
|
} while(0);
|
|
|
|
if (iic)
|
|
{
|
|
rt_free(iic);
|
|
}
|
|
rt_kprintf("IIC: Init failed!\n");
|
|
return RT_NULL;
|
|
}
|
|
|
|
/******************************************************************//**
|
|
* @brief
|
|
* Initialize all IIC module related hardware and register IIC device to kernel
|
|
*
|
|
* @details
|
|
*
|
|
* @note
|
|
*********************************************************************/
|
|
void rt_hw_iic_init(void)
|
|
{
|
|
struct efm32_iic_device_t *iic;
|
|
rt_uint32_t flag;
|
|
|
|
flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX;
|
|
|
|
/* register iic0 */
|
|
#ifdef RT_USING_IIC0
|
|
if ((iic = rt_hw_iic_unit_init(&iic0_device, 0, RT_USING_IIC0)) != RT_NULL)
|
|
{
|
|
rt_hw_iic_register(&iic0_device, RT_IIC0_NAME, flag, iic);
|
|
}
|
|
#endif
|
|
|
|
/* register iic1 */
|
|
#ifdef RT_USING_IIC1
|
|
if ((iic = rt_hw_iic_unit_init(&iic1_device, 1, RT_USING_IIC1)) != RT_NULL)
|
|
{
|
|
rt_hw_iic_register(&iic1_device, RT_IIC1_NAME, flag, iic);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
/******************************************************************//**
|
|
* @}
|
|
*********************************************************************/
|