255 lines
6.7 KiB
C
255 lines
6.7 KiB
C
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/**************************************************************************//**
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*
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* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-5-28 YCHuang12 First version
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*
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******************************************************************************/
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#include <rtconfig.h>
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#if (defined(BSP_USING_SOFT_I2C) && defined(BSP_USING_GPIO))
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#include <rtthread.h>
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#include <rthw.h>
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#include <rtdevice.h>
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#include <NuMicro.h>
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/* Private define ---------------------------------------------------------------*/
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#define LOG_TAG "drv.softi2c"
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#define DBG_ENABLE
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#define DBG_SECTION_NAME LOG_TAG
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#define DBG_LEVEL DBG_INFO
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#define DBG_COLOR
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#include <rtdbg.h>
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#ifdef BSP_USING_SOFT_I2C0
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#define NU_SOFT_I2C0_BUS_CONFIG \
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{ \
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.scl = BSP_SOFT_I2C0_SCL_PIN, \
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.sda = BSP_SOFT_I2C0_SDA_PIN, \
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.bus_name = "softi2c0", \
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}
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#endif
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#ifdef BSP_USING_SOFT_I2C1
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#define NU_SOFT_I2C1_BUS_CONFIG \
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{ \
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.scl = BSP_SOFT_I2C1_SCL_PIN, \
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.sda = BSP_SOFT_I2C1_SDA_PIN, \
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.bus_name = "softi2c1", \
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}
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#endif
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#if (!defined(BSP_USING_SOFT_I2C0) && !defined(BSP_USING_SOFT_I2C1))
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#error "Please define at least one BSP_USING_SOFT_I2Cx"
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/* this driver can be disabled at menuconfig ? RT-Thread Components ? Device Drivers */
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#endif
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/* Private typedef --------------------------------------------------------------*/
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/* soft i2c config class */
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struct nu_soft_i2c_config
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{
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rt_uint8_t scl;
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rt_uint8_t sda;
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const char *bus_name;
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};
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/* soft i2c dirver class */
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struct nu_soft_i2c
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{
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struct rt_i2c_bit_ops ops;
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struct rt_i2c_bus_device soft_i2c_bus;
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};
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/* Private functions ------------------------------------------------------------*/
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static void nu_soft_i2c_udelay(rt_uint32_t us);
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static void nu_soft_i2c_set_sda(void *data, rt_int32_t state);
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static void nu_soft_i2c_set_scl(void *data, rt_int32_t state);
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static rt_int32_t nu_soft_i2c_get_sda(void *data);
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static rt_int32_t nu_soft_i2c_get_scl(void *data);
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/* Private variables ------------------------------------------------------------*/
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static const struct nu_soft_i2c_config nu_soft_i2c_cfg[] =
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{
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#ifdef BSP_USING_SOFT_I2C0
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NU_SOFT_I2C0_BUS_CONFIG,
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#endif
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#ifdef BSP_USING_SOFT_I2C1
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NU_SOFT_I2C1_BUS_CONFIG,
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#endif
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};
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static struct nu_soft_i2c nu_soft_i2c_obj[sizeof(nu_soft_i2c_cfg) / sizeof(nu_soft_i2c_cfg[0])];
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static const struct rt_i2c_bit_ops nu_soft_i2c_bit_ops =
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{
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.data = RT_NULL,
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.set_sda = nu_soft_i2c_set_sda,
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.set_scl = nu_soft_i2c_set_scl,
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.get_sda = nu_soft_i2c_get_sda,
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.get_scl = nu_soft_i2c_get_scl,
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.udelay = nu_soft_i2c_udelay,
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.delay_us = 1,
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.timeout = 100
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};
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/* Functions define ------------------------------------------------------------*/
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/**
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* The time delay function.
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*
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* @param microseconds.
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*/
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static void nu_soft_i2c_udelay(rt_uint32_t us)
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{
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rt_uint32_t ticks;
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rt_uint32_t told, tnow, tcnt = 0;
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rt_uint32_t reload = SysTick->LOAD;
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ticks = us * reload / (1000000 / RT_TICK_PER_SECOND);
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told = SysTick->VAL;
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while (1)
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{
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tnow = SysTick->VAL;
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if (tnow != told)
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{
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if (tnow < told)
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{
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tcnt += told - tnow;
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}
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else
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{
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tcnt += reload - tnow + told;
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}
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told = tnow;
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if (tcnt >= ticks)
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{
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break;
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}
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}
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}
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}
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/**
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* This function initializes the soft i2c pin.
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*
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* @param soft i2c config class.
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*/
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static void nu_soft_i2c_gpio_init(const struct nu_soft_i2c_config *cfg)
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{
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rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
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rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
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rt_pin_write(cfg->scl, PIN_HIGH);
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rt_pin_write(cfg->sda, PIN_HIGH);
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}
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/**
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* if i2c is locked, this function will unlock it
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*
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* @param soft i2c config class
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*
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* @return RT_EOK indicates successful unlock.
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*/
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static rt_err_t nu_soft_i2c_bus_unlock(const struct nu_soft_i2c_config *cfg)
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{
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rt_int32_t i = 0;
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if (PIN_LOW == rt_pin_read(cfg->sda))
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{
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while (i++ < 9)
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{
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rt_pin_write(cfg->scl, PIN_HIGH);
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nu_soft_i2c_udelay(100);
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rt_pin_write(cfg->scl, PIN_LOW);
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nu_soft_i2c_udelay(100);
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}
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}
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if (PIN_LOW == rt_pin_read(cfg->sda))
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{
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return -RT_ERROR;
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}
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return RT_EOK;
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}
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/**
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* This function sets the sda pin.
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*
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* @param soft i2c config class.
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* @param The sda pin state.
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*/
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static void nu_soft_i2c_set_sda(void *data, rt_int32_t state)
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{
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struct nu_soft_i2c_config *cfg = (struct nu_soft_i2c_config *)data;
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rt_pin_write(cfg->sda, state ? PIN_HIGH : PIN_LOW);
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}
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/**
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* This function sets the scl pin.
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*
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* @param soft i2c config class.
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* @param The scl pin state.
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*/
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static void nu_soft_i2c_set_scl(void *data, rt_int32_t state)
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{
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struct nu_soft_i2c_config *cfg = (struct nu_soft_i2c_config *)data;
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rt_pin_write(cfg->scl, state ? PIN_HIGH : PIN_LOW);
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}
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/**
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* This function gets the sda pin state.
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*
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* @param The sda pin state.
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*/
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static rt_int32_t nu_soft_i2c_get_sda(void *data)
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{
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struct nu_soft_i2c_config *cfg = (struct nu_soft_i2c_config *)data;
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return rt_pin_read(cfg->sda);
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}
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/**
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* This function gets the scl pin state.
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*
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* @param The scl pin state.
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*/
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static rt_int32_t nu_soft_i2c_get_scl(void *data)
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{
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struct nu_soft_i2c_config *cfg = (struct nu_soft_i2c_config *)data;
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return rt_pin_read(cfg->scl);
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}
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/* Soft I2C initialization function */
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int rt_soft_i2c_init(void)
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{
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rt_size_t obj_num = sizeof(nu_soft_i2c_obj) / sizeof(struct nu_soft_i2c);
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rt_err_t result;
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for (int i = 0; i < obj_num; i++)
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{
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nu_soft_i2c_obj[i].ops = nu_soft_i2c_bit_ops;
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nu_soft_i2c_obj[i].ops.data = (void *)&nu_soft_i2c_cfg[i];
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nu_soft_i2c_obj[i].soft_i2c_bus.priv = &nu_soft_i2c_obj[i].ops;
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nu_soft_i2c_gpio_init(&nu_soft_i2c_cfg[i]);
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result = rt_i2c_bit_add_bus(&nu_soft_i2c_obj[i].soft_i2c_bus, nu_soft_i2c_cfg[i].bus_name);
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RT_ASSERT(result == RT_EOK);
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nu_soft_i2c_bus_unlock(&nu_soft_i2c_cfg[i]);
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LOG_D("software simulation %s init done, pin scl: %d, pin sda %d",
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nu_soft_i2c_cfg[i].bus_name,
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nu_soft_i2c_cfg[i].scl,
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nu_soft_i2c_cfg[i].sda);
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}
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return 0;
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}
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INIT_BOARD_EXPORT(rt_soft_i2c_init);
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#endif //(defined(BSP_USING_SOFT_I2C) && defined(BSP_USING_GPIO))
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