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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-12-20 BruceOu the first version
*/
#include "drv_soft_i2c.h"
#ifdef RT_USING_I2C
#define LOG_TAG "drv.i2c"
#include <rtdbg.h>
#if !defined(BSP_USING_I2C0) && !defined(BSP_USING_I2C1) && !defined(BSP_USING_I2C2) && !defined(BSP_USING_I2C3)
#error "Please define at least one BSP_USING_I2Cx"
/* this driver can be disabled at menuconfig → RT-Thread Components → Device Drivers */
#endif
static const struct gd32_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_I2C0
I2C0_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C1
I2C1_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C2
I2C2_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C3
I2C3_BUS_CONFIG,
#endif
};
static struct gd32_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/**
* @brief This function initializes the i2c pin.
* @param i2c
* @retval None
*/
static void gd32_i2c_gpio_init(struct gd32_i2c *i2c)
{
struct gd32_soft_i2c_config* cfg = (struct gd32_soft_i2c_config*)i2c->ops.data;
rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
rt_pin_write(cfg->scl, PIN_HIGH);
rt_pin_write(cfg->sda, PIN_HIGH);
}
/**
* @brief This function sets the sda pin.
* @param data, state
* @retval None
*/
static void gd32_set_sda(void *data, rt_int32_t state)
{
struct gd32_soft_i2c_config* cfg = (struct gd32_soft_i2c_config*)data;
if (state)
{
rt_pin_write(cfg->sda, PIN_HIGH);
}
else
{
rt_pin_write(cfg->sda, PIN_LOW);
}
}
/**
* @brief This function sets the scl pin.
* @param data, state
* @retval None
*/
static void gd32_set_scl(void *data, rt_int32_t state)
{
struct gd32_soft_i2c_config* cfg = (struct gd32_soft_i2c_config*)data;
if (state)
{
rt_pin_write(cfg->scl, PIN_HIGH);
}
else
{
rt_pin_write(cfg->scl, PIN_LOW);
}
}
/**
* @brief This function gets the sda pin state.
* @param data
* @retval None
*/
static rt_int32_t gd32_get_sda(void *data)
{
struct gd32_soft_i2c_config* cfg = (struct gd32_soft_i2c_config*)data;
return rt_pin_read(cfg->sda);
}
/**
* @brief This function gets the scl pin state.
* @param data
* @retval None
*/
static rt_int32_t gd32_get_scl(void *data)
{
struct gd32_soft_i2c_config* cfg = (struct gd32_soft_i2c_config*)data;
return rt_pin_read(cfg->scl);
}
/**
* @brief The time delay function.
* @param us
* @retval None
*/
static void gd32_udelay(rt_uint32_t us)
{
int i = ( rcu_clock_freq_get(CK_SYS) / 4000000 * us);
while(i)
{
i--;
}
}
static const struct rt_i2c_bit_ops gd32_bit_ops_default =
{
.data = RT_NULL,
.set_sda = gd32_set_sda,
.set_scl = gd32_set_scl,
.get_sda = gd32_get_sda,
.get_scl = gd32_get_scl,
.udelay = gd32_udelay,
.delay_us = 1,
.timeout = 100
};
/**
* @brief if i2c is locked, this function will unlock it
* @param cfg
* @retval RT_EOK indicates successful unlock.
*/
static rt_err_t gd32_i2c_bus_unlock(const struct gd32_soft_i2c_config *cfg)
{
rt_int32_t i = 0;
if (PIN_LOW == rt_pin_read(cfg->sda))
{
while (i++ < 9)
{
rt_pin_write(cfg->scl, PIN_HIGH);
gd32_udelay(100);
rt_pin_write(cfg->scl, PIN_LOW);
gd32_udelay(100);
}
}
if (PIN_LOW == rt_pin_read(cfg->sda))
{
return -RT_ERROR;
}
return RT_EOK;
}
/**
* @brief I2C initialization function
* @param None
* @retval RT_EOK indicates successful initialization.
*/
int rt_hw_i2c_init(void)
{
rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct gd32_i2c);
rt_err_t result;
for (int i = 0; i < obj_num; i++)
{
i2c_obj[i].ops = gd32_bit_ops_default;
i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
gd32_i2c_gpio_init(&i2c_obj[i]);
result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c2_bus, soft_i2c_config[i].bus_name);
RT_ASSERT(result == RT_EOK);
gd32_i2c_bus_unlock(&soft_i2c_config[i]);
LOG_D("software simulation %s init done, pin scl: %d, pin sda %d",
soft_i2c_config[i].bus_name,
soft_i2c_config[i].scl,
soft_i2c_config[i].sda);
}
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_i2c_init);
#endif /* RT_USING_I2C */
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