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rt-thread-official/bsp/efm32/drv_leuart.c

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/***************************************************************************//**
* @file drv_leuart.c
* @brief LEUART driver of RT-Thread RTOS for EFM32
* COPYRIGHT (C) 2011, RT-Thread Development Team
* @author onelife
* @version 0.4 beta
*******************************************************************************
* @section License
* The license and distribution terms for this file may be found in the file
* LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
*******************************************************************************
* @section Change Logs
* Date Author Notes
* 2011-12-09 onelife Initial creation for EFM32
* 2011-12-27 onelife Utilize "LEUART_PRESENT" and "LEUART_COUNT"
******************************************************************************/
/***************************************************************************//**
* @addtogroup efm32
* @{
******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "board.h"
#include "hdl_interrupt.h"
#include "drv_leuart.h"
#if (defined(RT_USING_LEUART0) || defined(RT_USING_LEUART1))
#if !defined(LEUART_PRESENT)
#error "LEUART module is not available"
#endif
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#ifdef RT_LEUART_DEBUG
#define leuart_debug(format,args...) rt_kprintf(format, ##args)
#else
#define leuart_debug(format,args...)
#endif
/* Private variables ---------------------------------------------------------*/
#if defined(RT_USING_LEUART0)
#if (RT_USING_LEUART0 >= EFM32_LEUART_LOCATION_COUNT)
#error "Wrong location number"
#endif
struct rt_device leuart0_device;
static struct rt_semaphore leuart0_lock;
#endif
#if defined(RT_USING_LEUART1)
#if (LEUART_COUNT <= 1)
#error "Wrong unit number"
#endif
#if (RT_USING_LEUART1 >= EFM32_LEUART_LOCATION_COUNT)
#error "Wrong location number"
#endif
struct rt_device leuart1_device;
static struct rt_semaphore leuart1_lock;
#endif
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/***************************************************************************//**
* @brief
* Initialize LEUART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @return
* Error code
******************************************************************************/
static rt_err_t rt_leuart_init (rt_device_t dev)
{
struct efm32_leuart_device_t *leuart;
leuart = (struct efm32_leuart_device_t *)(dev->user_data);
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
{
struct efm32_leuart_dma_mode_t *dma_tx;
dma_tx = (struct efm32_leuart_dma_mode_t *)(leuart->tx_mode);
leuart->state |= LEUART_STATE_RX_BUSY;
}
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
struct efm32_leuart_int_mode_t *int_rx;
int_rx = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);
int_rx->data_ptr = RT_NULL;
}
/* Enable LEUART */
LEUART_Enable(leuart->leuart_device, leuartEnable);
dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
return RT_EOK;
}
/***************************************************************************//**
* @brief
* Open LEUART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] oflag
* Device open flag
*
* @return
* Error code
******************************************************************************/
static rt_err_t rt_leuart_open(rt_device_t dev, rt_uint16_t oflag)
{
RT_ASSERT(dev != RT_NULL);
struct efm32_leuart_device_t *leuart;
leuart = (struct efm32_leuart_device_t *)(dev->user_data);
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
IRQn_Type rxIrq;
//if (leuart->state & LEUART_STATE_CONSOLE)
{ /* Allocate new RX buffer */
struct efm32_leuart_int_mode_t *int_mode;
int_mode = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);
if ((int_mode->data_ptr = rt_malloc(LEUART_RX_BUFFER_SIZE)) == RT_NULL)
{
leuart_debug("LEUART%d err: no mem for RX BUF\n", leuart->unit);
return -RT_ENOMEM;
}
rt_memset(int_mode->data_ptr, 0, LEUART_RX_BUFFER_SIZE);
int_mode->data_size = LEUART_RX_BUFFER_SIZE;
int_mode->read_index = 0;
int_mode->save_index = 0;
}
/* Enable RX interrupt */
leuart->leuart_device->IEN = LEUART_IEN_RXDATAV;
/* Enable IRQ */
switch (leuart->unit)
{
case 0:
rxIrq = LEUART0_IRQn;
break;
#if (LEUART_COUNT > 1)
case 1:
rxIrq = LEUART1_IRQn;
break;
#endif
}
if (oflag != RT_DEVICE_OFLAG_WRONLY)
{
NVIC_ClearPendingIRQ(rxIrq);
NVIC_SetPriority(rxIrq, EFM32_IRQ_PRI_DEFAULT);
NVIC_EnableIRQ(rxIrq);
}
}
/* Clear Flag */
leuart->leuart_device->IFC = _LEUART_IFC_MASK;
if ((dev->flag & RT_DEVICE_FLAG_DMA_TX) && (oflag != RT_DEVICE_OFLAG_RDONLY))
{
/* DMA IRQ is enabled by DMA_Init() */
NVIC_SetPriority(DMA_IRQn, EFM32_IRQ_PRI_DEFAULT);
}
leuart->counter++;
leuart_debug("LEUART%d: Open with flag %x\n", leuart->unit, oflag);
return RT_EOK;
}
/***************************************************************************//**
* @brief
* Close LEUART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @return
* Error code
******************************************************************************/
static rt_err_t rt_leuart_close(rt_device_t dev)
{
RT_ASSERT(dev != RT_NULL);
struct efm32_leuart_device_t *leuart;
leuart = (struct efm32_leuart_device_t *)(dev->user_data);
if (--leuart->counter == 0)
{
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
struct efm32_leuart_int_mode_t *int_rx;
int_rx = (struct efm32_leuart_int_mode_t *)leuart->rx_mode;
rt_free(int_rx->data_ptr);
int_rx->data_ptr = RT_NULL;
}
}
return RT_EOK;
}
/***************************************************************************//**
* @brief
* Read from LEUART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] pos
* Offset
*
* @param[in] buffer
* Poniter to the buffer
*
* @param[in] size
* Buffer size in byte
*
* @return
* Number of read bytes
******************************************************************************/
static rt_size_t rt_leuart_read (
rt_device_t dev,
rt_off_t pos,
void *buffer,
rt_size_t size)
{
struct efm32_leuart_device_t *leuart;
rt_uint8_t *ptr;
rt_err_t err_code;
rt_size_t read_len;
leuart = (struct efm32_leuart_device_t *)(dev->user_data);
/* Lock device */
if (rt_hw_interrupt_check())
{
err_code = rt_sem_take(leuart->lock, RT_WAITING_NO);
}
else
{
err_code = rt_sem_take(leuart->lock, RT_WAITING_FOREVER);
}
if (err_code != RT_EOK)
{
rt_set_errno(err_code);
return 0;
}
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
ptr = buffer;
/* interrupt mode Rx */
while (size)
{
rt_base_t level;
struct efm32_leuart_int_mode_t *int_rx;
int_rx = (struct efm32_leuart_int_mode_t *)\
(((struct efm32_leuart_device_t *)(dev->user_data))->rx_mode);
/* disable interrupt */
level = rt_hw_interrupt_disable();
if (int_rx->read_index != int_rx->save_index)
{
/* read a character */
*ptr++ = int_rx->data_ptr[int_rx->read_index];
size--;
/* move to next position */
int_rx->read_index ++;
if (int_rx->read_index >= LEUART_RX_BUFFER_SIZE)
{
int_rx->read_index = 0;
}
}
else
{
/* set error code */
err_code = -RT_EEMPTY;
/* enable interrupt */
rt_hw_interrupt_enable(level);
break;
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
read_len = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
}
else
{
LEUART_TypeDef *leuart_device;
leuart = (struct efm32_leuart_device_t *)(dev->user_data);
leuart_device = ((struct efm32_leuart_device_t *)(dev->user_data))->leuart_device;
ptr = buffer;
/* polling mode */
while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)
{
while (leuart_device->STATUS & LEUART_STATUS_RXDATAV)
{
*ptr = leuart_device->RXDATA & 0xff;
ptr ++;
}
}
read_len = size;
}
/* Unlock device */
rt_sem_release(leuart->lock);
/* set error code */
rt_set_errno(err_code);
return read_len;
}
/***************************************************************************//**
* @brief
* Write to LEUART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] pos
* Offset
*
* @param[in] buffer
* Poniter to the buffer
*
* @param[in] size
* Buffer size in byte
*
* @return
* Number of written bytes
******************************************************************************/
static rt_size_t rt_leuart_write (
rt_device_t dev,
rt_off_t pos,
const void* buffer,
rt_size_t size)
{
rt_err_t err_code;
rt_size_t write_size;
struct efm32_leuart_device_t* leuart;
write_size = 0;
leuart = (struct efm32_leuart_device_t*)(dev->user_data);
/* Lock device */
if (rt_hw_interrupt_check())
{
err_code = rt_sem_take(leuart->lock, RT_WAITING_NO);
}
else
{
err_code = rt_sem_take(leuart->lock, RT_WAITING_FOREVER);
}
if (err_code != RT_EOK)
{
rt_set_errno(err_code);
return 0;
}
if ((dev->flag & RT_DEVICE_FLAG_DMA_TX) && (size > 2))
{ /* DMA mode Tx */
struct efm32_leuart_dma_mode_t *dma_tx;
if (dev->flag & RT_DEVICE_FLAG_STREAM)
{
if (*((rt_uint8_t *)buffer + size - 1) == '\n')
{
*((rt_uint8_t *)buffer + size - 1) = '\r';
*((rt_uint8_t *)buffer + size++) = '\n';
*((rt_uint8_t *)buffer + size) = 0;
}
}
dma_tx = (struct efm32_leuart_dma_mode_t *)(leuart->tx_mode);
dma_tx->data_ptr = (rt_uint32_t *)buffer;
dma_tx->data_size = size;
leuart->state |= LEUART_STATE_TX_BUSY;
DMA_ActivateBasic(
dma_tx->dma_channel,
true,
false,
(void *)&(leuart->leuart_device->TXDATA),
(void *)buffer,
(rt_uint32_t)(size - 1));
/* Wait, otherwise the TX buffer is overwrite */
// if (leuart->state & LEUART_STATE_CONSOLE)
// {
while(leuart->state & LEUART_STATE_TX_BUSY);
// }
// else
// {
// while(leuart->state & LEUART_STATE_TX_BUSY)
// {
// rt_thread_sleep(LEUART_WAIT_TIME_TX);
// }
// }
// TODO: This function blocks the process
write_size = size;
}
else
{ /* polling mode */
rt_uint8_t *ptr = (rt_uint8_t *)buffer;
if (dev->flag & RT_DEVICE_FLAG_STREAM)
{
/* stream mode */
while (size)
{
if (*ptr == '\n')
{
while (!(leuart->leuart_device->STATUS & LEUART_STATUS_TXBL));
leuart->leuart_device->TXDATA = '\r';
}
while (!(leuart->leuart_device->STATUS & LEUART_STATUS_TXBL));
leuart->leuart_device->TXDATA = (rt_uint32_t)*ptr;
++ptr; --size;
}
}
else
{
/* write data directly */
while (size)
{
while (!(leuart->leuart_device->STATUS & LEUART_STATUS_TXBL));
leuart->leuart_device->TXDATA = (rt_uint32_t)*ptr;
++ptr; --size;
}
}
write_size = (rt_size_t)ptr - (rt_size_t)buffer;
}
/* Unlock device */
rt_sem_release(leuart->lock);
/* set error code */
rt_set_errno(err_code);
return write_size;
}
/***************************************************************************//**
* @brief
* Configure LEUART device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] cmd
* IIC control command
*
* @param[in] args
* Arguments
*
* @return
* Error code
******************************************************************************/
static rt_err_t rt_leuart_control (
rt_device_t dev,
rt_uint8_t cmd,
void *args)
{
RT_ASSERT(dev != RT_NULL);
rt_err_t err_code;
struct efm32_leuart_device_t *leuart;
leuart = (struct efm32_leuart_device_t *)(dev->user_data);
/* Lock device */
if (rt_hw_interrupt_check())
{
err_code = rt_sem_take(leuart->lock, RT_WAITING_NO);
}
else
{
err_code = rt_sem_take(leuart->lock, RT_WAITING_FOREVER);
}
if (err_code != RT_EOK)
{
return err_code;
}
switch (cmd)
{
case RT_DEVICE_CTRL_SUSPEND:
/* Suspend device */
dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
LEUART_Enable(leuart->leuart_device, leuartDisable);
break;
case RT_DEVICE_CTRL_RESUME:
/* Resume device */
dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
LEUART_Enable(leuart->leuart_device, leuartEnable);
break;
case RT_DEVICE_CTRL_LEUART_RBUFFER:
/* Set RX buffer */
{
struct efm32_leuart_int_mode_t *int_rx;
rt_uint8_t size;
int_rx = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);
size = (rt_uint8_t)((rt_uint32_t)args & 0xFFUL);
/* Free previous RX buffer */
if (int_rx->data_ptr != RT_NULL)
{
if (size == 0)
{ /* Free RX buffer */
rt_free(int_rx->data_ptr);
int_rx->data_ptr = RT_NULL;
}
else if (size != int_rx->data_size)
{
/* Re-allocate RX buffer */
if ((int_rx->data_ptr = rt_realloc(int_rx->data_ptr, size)) \
== RT_NULL)
{
leuart_debug("LEUART%d err: no mem for RX BUF\n", leuart->unit);
err_code = -RT_ENOMEM;
break;
}
// TODO: Is the following line necessary?
//rt_memset(int_rx->data_ptr, 0, size);
}
}
else
{
/* Allocate new RX buffer */
if ((int_rx->data_ptr = rt_malloc(size)) == RT_NULL)
{
leuart_debug("LEUART%d err: no mem for RX BUF\n", leuart->unit);
err_code = -RT_ENOMEM;
break;
}
}
int_rx->data_size = size;
int_rx->read_index = 0;
int_rx->save_index = 0;
}
break;
}
/* Unlock device */
rt_sem_release(leuart->lock);
return err_code;
}
/***************************************************************************//**
* @brief
* LEUART RX data valid interrupt handler
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
******************************************************************************/
void rt_hw_leuart_rx_isr(rt_device_t dev)
{
struct efm32_leuart_device_t *leuart;
struct efm32_leuart_int_mode_t *int_rx;
rt_uint32_t flag;
/* interrupt mode receive */
RT_ASSERT(dev->flag & RT_DEVICE_FLAG_INT_RX);
leuart = (struct efm32_leuart_device_t *)(dev->user_data);
int_rx = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);
RT_ASSERT(int_rx->data_ptr != RT_NULL);
/* Set status */
leuart->state |= LEUART_STATE_RX_BUSY;
/* save into rx buffer */
while (leuart->leuart_device->STATUS & LEUART_STATUS_RXDATAV)
{
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* save character */
int_rx->data_ptr[int_rx->save_index] = \
(rt_uint8_t)(leuart->leuart_device->RXDATA & 0xFFUL);
int_rx->save_index ++;
if (int_rx->save_index >= LEUART_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 >= LEUART_RX_BUFFER_SIZE)
{
int_rx->read_index = 0;
}
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
/* invoke callback */
if (dev->rx_indicate != RT_NULL)
{
rt_size_t rx_length;
/* get rx length */
rx_length = int_rx->read_index > int_rx->save_index ?
LEUART_RX_BUFFER_SIZE - int_rx->read_index + int_rx->save_index : \
int_rx->save_index - int_rx->read_index;
dev->rx_indicate(dev, rx_length);
}
}
/***************************************************************************//**
* @brief
* DMA for LEUART TX interrupt handler
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
******************************************************************************/
void rt_hw_leuart_dma_tx_isr(rt_device_t dev)
{
/* DMA mode receive */
struct efm32_leuart_device_t *leuart;
struct efm32_leuart_dma_mode_t *dma_tx;
RT_ASSERT(dev->flag & RT_DEVICE_FLAG_DMA_TX);
leuart = (struct efm32_leuart_device_t *)(dev->user_data);
dma_tx = (struct efm32_leuart_dma_mode_t *)(leuart->tx_mode);
/* invoke call to notify tx complete */
if (dev->tx_complete != RT_NULL)
{
dev->tx_complete(dev, dma_tx->data_ptr);
}
/* Set status */
leuart->state &= ~(rt_uint32_t)LEUART_STATE_TX_BUSY;
}
/***************************************************************************//**
* @brief
* Register LEUART device
*
* @details
*
* @note
*
* @param[in] device
* Pointer to device descriptor
*
* @param[in] name
* Device name
*
* @param[in] flag
* Configuration flags
*
* @param[in] leuart
* Pointer to LEUART device descriptor
*
* @return
* Error code
******************************************************************************/
rt_err_t rt_hw_leuart_register(
rt_device_t device,
const char *name,
rt_uint32_t flag,
struct efm32_leuart_device_t *leuart)
{
RT_ASSERT(device != RT_NULL);
if ((flag & RT_DEVICE_FLAG_DMA_RX) ||
(flag & RT_DEVICE_FLAG_INT_TX))
{
RT_ASSERT(0);
}
device->type = RT_Device_Class_Char;
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
device->init = rt_leuart_init;
device->open = rt_leuart_open;
device->close = rt_leuart_close;
device->read = rt_leuart_read;
device->write = rt_leuart_write;
device->control = rt_leuart_control;
device->user_data = leuart;
/* register a character device */
return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
}
/***************************************************************************//**
* @brief
* Initialize the specified LEUART unit
*
* @details
*
* @note
*
* @param[in] device
* Pointer to device descriptor
*
* @param[in] unitNumber
* Unit number
*
* @param[in] location
* Pin location number
*
* @param[in] flag
* Configuration flag
*
* @param[in] dmaChannel
* DMA channel number for TX
*
* @param[in] console
* Indicate if using as console
*
* @return
* Pointer to LEUART device
******************************************************************************/
static struct efm32_leuart_device_t *rt_hw_leuart_unit_init(
rt_device_t device,
rt_uint8_t unitNumber,
rt_uint8_t location,
rt_uint32_t flag,
rt_uint32_t dmaChannel,
rt_uint8_t config)
{
struct efm32_leuart_device_t *leuart;
struct efm32_leuart_dma_mode_t *dma_mode;
DMA_CB_TypeDef *callback;
CMU_Clock_TypeDef leuartClock;
rt_uint32_t txDmaSelect;
GPIO_Port_TypeDef port_tx, port_rx, port_clk, port_cs;
rt_uint32_t pin_tx, pin_rx, pin_clk, pin_cs;
LEUART_Init_TypeDef init = LEUART_INIT_DEFAULT;
efm32_irq_hook_init_t hook;
do
{
/* Allocate device */
leuart = rt_malloc(sizeof(struct efm32_leuart_device_t));
if (leuart == RT_NULL)
{
leuart_debug("LEUART%d err: no mem\n", unitNumber);
break;
}
leuart->counter = 0;
leuart->unit = unitNumber;
leuart->state = config;
leuart->tx_mode = RT_NULL;
leuart->rx_mode = RT_NULL;
/* Allocate TX */
dma_mode = RT_NULL;
if (flag & RT_DEVICE_FLAG_DMA_TX)
{
leuart->tx_mode = dma_mode = rt_malloc(sizeof(struct efm32_leuart_dma_mode_t));
if (dma_mode == RT_NULL)
{
leuart_debug("LEUART%d err: no mem for DMA TX\n", unitNumber);
break;
}
dma_mode->dma_channel = dmaChannel;
}
/* Allocate RX */
if (flag & RT_DEVICE_FLAG_INT_RX)
{
leuart->rx_mode = rt_malloc(sizeof(struct efm32_leuart_int_mode_t));
if (leuart->rx_mode == RT_NULL)
{
leuart_debug("LEUART%d err: no mem for INT RX\n, unitNumber");
break;
}
}
/* Initialization */
if (unitNumber >= LEUART_COUNT)
{
break;
}
switch (unitNumber)
{
case 0:
leuart->leuart_device = LEUART0;
leuartClock = (CMU_Clock_TypeDef)cmuClock_LEUART0;
txDmaSelect = DMAREQ_LEUART0_TXBL;
port_tx = AF_LEUART0_TX_PORT(location);
pin_tx = AF_LEUART0_TX_PIN(location);
port_rx = AF_LEUART0_RX_PORT(location);
pin_rx = AF_LEUART0_RX_PIN(location);
break;
#if (LEUART_COUNT > 1)
case 1:
leuart->leuart_device = LEUART1;
leuartClock = (CMU_Clock_TypeDef)cmuClock_LEUART1;
txDmaSelect = DMAREQ_LEUART1_TXBL;
port_tx = AF_LEUART1_TX_PORT(location);
pin_tx = AF_LEUART1_TX_PIN(location);
port_rx = AF_LEUART1_RX_PORT(location);
pin_rx = AF_LEUART1_RX_PIN(location);
break;
#endif
default:
break;
}
/* Do not prescale clock */
CMU_ClockDivSet(leuartClock, cmuClkDiv_1);
/* Enable LEUART clock */
CMU_ClockEnable(leuartClock, true);
/* Config GPIO */
GPIO_PinModeSet(
port_tx,
pin_tx,
gpioModePushPull,
0);
GPIO_PinModeSet(
port_rx,
pin_rx,
gpioModeInputPull,
1);
/* Config interrupt and NVIC */
if (flag & RT_DEVICE_FLAG_INT_RX)
{
hook.type = efm32_irq_type_leuart;
hook.unit = unitNumber;
hook.cbFunc = rt_hw_leuart_rx_isr;
hook.userPtr = device;
efm32_irq_hook_register(&hook);
}
/* Config DMA */
if (flag & RT_DEVICE_FLAG_DMA_TX)
{
DMA_CfgChannel_TypeDef chnlCfg;
DMA_CfgDescr_TypeDef descrCfg;
hook.type = efm32_irq_type_dma;
hook.unit = dmaChannel;
hook.cbFunc = rt_hw_leuart_dma_tx_isr;
hook.userPtr = device;
efm32_irq_hook_register(&hook);
callback = (DMA_CB_TypeDef *)rt_malloc(sizeof(DMA_CB_TypeDef));
if (callback == RT_NULL)
{
leuart_debug("LEUART%d err: no mem for callback\n", unitNumber);
break;
}
callback->cbFunc = DMA_IRQHandler_All;
callback->userPtr = RT_NULL;
callback->primary = 0;
/* Setting up DMA channel */
chnlCfg.highPri = false; /* Can't use with peripherals */
chnlCfg.enableInt = true; /* Interrupt for callback function */
chnlCfg.select = txDmaSelect;
chnlCfg.cb = callback;
DMA_CfgChannel(dmaChannel, &chnlCfg);
/* Setting up DMA channel descriptor */
descrCfg.dstInc = dmaDataIncNone;
descrCfg.srcInc = dmaDataInc1;
descrCfg.size = dmaDataSize1;
descrCfg.arbRate = dmaArbitrate1;
descrCfg.hprot = 0;
DMA_CfgDescr(dmaChannel, true, &descrCfg);
}
/* Init specified LEUART unit */
LEUART_Init(leuart->leuart_device, &init);
/* Enable RX and TX pins and set location */
leuart->leuart_device->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN | \
(location << _LEUART_ROUTE_LOCATION_SHIFT);
/* Clear RX/TX buffers */
leuart->leuart_device->CMD = LEUART_CMD_CLEARRX | LEUART_CMD_CLEARTX;
return leuart;
} while(0);
if (leuart->rx_mode)
{
rt_free(leuart->rx_mode);
}
if (leuart->tx_mode)
{
rt_free(leuart->tx_mode);
}
if (leuart)
{
rt_free(leuart);
}
if (callback)
{
rt_free(leuart);
}
leuart_debug("LEUART%d err: init failed!\n", unitNumber);
return RT_NULL;
}
/***************************************************************************//**
* @brief
* Initialize all LEUART module related hardware and register LEUART device to
* kernel
*
* @details
*
* @note
******************************************************************************/
void rt_hw_leuart_init(void)
{
struct efm32_leuart_device_t *leuart;
rt_uint32_t flag;
rt_uint8_t config;
do
{
#ifdef RT_USING_LEUART0
config = 0;
flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX;
#if (RT_CONSOLE_DEVICE == EFM_LEUART0)
config |= LEUART_STATE_CONSOLE;
flag |= RT_DEVICE_FLAG_STREAM;
#endif
#ifdef RT_LEUART0_USING_DMA
RT_ASSERT(RT_LEUART0_USING_DMA < DMA_CHAN_COUNT);
flag |= RT_DEVICE_FLAG_DMA_TX;
#else
#define RT_LEUART0_USING_DMA EFM32_NO_DMA
#endif
/* Initialize and Register leuart0 */
if ((leuart = rt_hw_leuart_unit_init(
&leuart0_device,
0,
RT_USING_LEUART0,
flag,
RT_LEUART0_USING_DMA,
config)) != RT_NULL)
{
rt_hw_leuart_register(&leuart0_device, RT_LEUART0_NAME, flag, leuart);
}
else
{
break;
}
/* Initialize lock for leuart0 */
leuart->lock = &leuart0_lock;
if (rt_sem_init(leuart->lock, RT_LEUART0_NAME, 1, RT_IPC_FLAG_FIFO) != RT_EOK)
{
break;
}
#endif
#if ((LEUART_COUNT > 1) && defined(RT_USING_LEUART1))
config = 0;
flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX;
#if (RT_CONSOLE_DEVICE == EFM_LEUART1)
config |= LEUART_STATE_CONSOLE;
flag |= RT_DEVICE_FLAG_STREAM;
#endif
#ifdef RT_LEUART1_USING_DMA
RT_ASSERT(RT_LEUART1_USING_DMA < DMA_CHAN_COUNT);
flag |= RT_DEVICE_FLAG_DMA_TX;
#else
#define RT_LEUART1_USING_DMA EFM32_NO_DMA
#endif
/* Initialize and Register leuart1 */
if ((leuart = rt_hw_leuart_unit_init(
&leuart1_device,
1,
RT_USING_LEUART1,
flag,
RT_LEUART1_USING_DMA,
config)) != RT_NULL)
{
rt_hw_leuart_register(&leuart1_device, RT_LEUART1_NAME, flag, leuart);
}
else
{
break;
}
/* Initialize lock for leuart1 */
leuart->lock = &leuart1_lock;
if (rt_sem_init(leuart->lock, RT_LEUART1_NAME, 1, RT_IPC_FLAG_FIFO) != RT_EOK)
{
break;
}
#endif
leuart_debug("LEUART: H/W init OK!\n");
return;
} while (0);
rt_kprintf("LEUART: H/W init failed!\n");
}
#endif /* (defined(RT_USING_LEUART0) || defined(RT_USING_LEUART1)) */
/***************************************************************************//**
* @}
******************************************************************************/
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