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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-03-04 stevetong459 first version
*/
#include "board.h"
#include <sys/time.h>
#ifdef RT_USING_I2C
#define DBG_TAG "drv.i2c"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#if !defined(BSP_USING_I2C1) && !defined(BSP_USING_I2C2) && !defined(BSP_USING_I2C3) && !defined(BSP_USING_I2C4)
#error "Please define at least one BSP_USING_I2Cx"
#endif
/* apm32 i2c config class */
struct apm32_soft_i2c_config
{
rt_uint8_t scl_pin;
rt_uint8_t sda_pin;
const char *bus_name;
};
/* apm32 i2c dirver class */
struct apm32_soft_i2c
{
struct rt_i2c_bit_ops ops;
struct rt_i2c_bus_device i2c_bus;
};
static const struct apm32_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_I2C1
{
BSP_I2C1_SCL_PIN,
BSP_I2C1_SDA_PIN,
"i2c1"
},
#endif
#ifdef BSP_USING_I2C2
{
BSP_I2C2_SCL_PIN,
BSP_I2C2_SDA_PIN,
"i2c2"
},
#endif
#ifdef BSP_USING_I2C3
{
BSP_I2C3_SCL_PIN,
BSP_I2C3_SDA_PIN,
"i2c3"
},
#endif
#ifdef BSP_USING_I2C4
{
BSP_I2C4_SCL_PIN,
BSP_I2C4_SDA_PIN,
"i2c4"
},
#endif
};
static struct apm32_soft_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/**
* @brief This function will config gpio of soft i2c.
*
* @param i2c is a pointer to the object of soft i2c.
*/
static void apm32_soft_i2c_gpio_init(struct apm32_soft_i2c *i2c)
{
struct apm32_soft_i2c_config *cfg = (struct apm32_soft_i2c_config *)i2c->ops.data;
rt_pin_mode(cfg->scl_pin, PIN_MODE_OUTPUT_OD);
rt_pin_mode(cfg->sda_pin, PIN_MODE_OUTPUT_OD);
rt_pin_write(cfg->scl_pin, PIN_HIGH);
rt_pin_write(cfg->sda_pin, PIN_HIGH);
}
static void apm32_i2c_pin_init(void)
{
rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct apm32_soft_i2c);
for(rt_size_t i = 0; i < obj_num; i++)
{
apm32_soft_i2c_gpio_init(&i2c_obj[i]);
}
}
/**
* @brief This function sets the sda pin.
*
* @param data is a pointer to the i2c config class.
*
* @param state is the level of sda pin.
*/
static void apm32_soft_i2c_set_sda(void *data, rt_int32_t state)
{
struct apm32_soft_i2c_config *cfg = (struct apm32_soft_i2c_config *)data;
rt_pin_write(cfg->sda_pin, state ? PIN_HIGH : PIN_LOW);
}
/**
* @brief This function sets the scl pin.
*
* @param data is a pointer to the i2c config class.
*
* @param state is the level of scl pin.
*/
static void apm32_soft_i2c_set_scl(void *data, rt_int32_t state)
{
struct apm32_soft_i2c_config *cfg = (struct apm32_soft_i2c_config *)data;
rt_pin_write(cfg->scl_pin, state ? PIN_HIGH : PIN_LOW);
}
/**
* @brief This function gets the sda pin state.
*
* @param data is a pointer to the i2c config class.
*/
static rt_int32_t apm32_soft_i2c_get_sda(void *data)
{
struct apm32_soft_i2c_config *cfg = (struct apm32_soft_i2c_config *)data;
return rt_pin_read(cfg->sda_pin);
}
/**
* @brief This function gets the scl pin state.
*
* @param data is a pointer to the i2c config class.
*/
static rt_int32_t apm32_soft_i2c_get_scl(void *data)
{
struct apm32_soft_i2c_config *cfg = (struct apm32_soft_i2c_config *)data;
return rt_pin_read(cfg->scl_pin);
}
/**
* @brief The time delay function in microseconds.
*
* @param us is the microseconds to delay.
*/
static void apm32_soft_i2c_udelay(rt_uint32_t us)
{
rt_uint32_t count_old = SysTick->VAL;
rt_uint32_t count_now;
rt_uint32_t count = 0;
rt_uint32_t reload = SysTick->LOAD;
rt_uint32_t count_pre_us = (reload * RT_TICK_PER_SECOND) / 1000000;
while (count_pre_us * us > count)
{
count_now = SysTick->VAL;
if (count_now != count_old)
{
if (count_now < count_old)
{
count += count_old - count_now;
}
else
{
count += reload - count_now + count_old;
}
count_old = count_now;
}
}
}
/**
* @brief This function will unlock i2c, if it is locked.
*
* @param cfg is a pointer to i2c config class.
*
* @return RT_EOK indicates successful unlock, other value indicates failed.
*/
static rt_err_t apm32_i2c_bus_unlock(const struct apm32_soft_i2c_config *cfg)
{
rt_int32_t i = 0;
if (PIN_LOW == rt_pin_read(cfg->sda_pin))
{
while (i++ < 9)
{
rt_pin_write(cfg->scl_pin, PIN_HIGH);
apm32_soft_i2c_udelay(100);
rt_pin_write(cfg->scl_pin, PIN_LOW);
apm32_soft_i2c_udelay(100);
}
}
if (PIN_LOW == rt_pin_read(cfg->sda_pin))
{
return -RT_ERROR;
}
return RT_EOK;
}
static const struct rt_i2c_bit_ops apm32_bit_ops_default =
{
.data = RT_NULL,
.pin_init = apm32_i2c_pin_init,
.set_sda = apm32_soft_i2c_set_sda,
.set_scl = apm32_soft_i2c_set_scl,
.get_sda = apm32_soft_i2c_get_sda,
.get_scl = apm32_soft_i2c_get_scl,
.udelay = apm32_soft_i2c_udelay,
.delay_us = 1,
.timeout = 100,
.i2c_pin_init_flag = RT_FALSE
};
/**
* @brief I2C initialization function.
*
* @return RT_EOK indicates successful initialization, other value indicates failed;
*/
int rt_hw_i2c_init(void)
{
rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct apm32_soft_i2c);
rt_err_t result;
for (rt_size_t i = 0; i < obj_num; i++)
{
i2c_obj[i].ops = apm32_bit_ops_default;
i2c_obj[i].ops.data = (void *)&soft_i2c_config[i];
i2c_obj[i].i2c_bus.priv = &i2c_obj[i].ops;
result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c_bus, soft_i2c_config[i].bus_name);
RT_ASSERT(result == RT_EOK);
apm32_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_pin,
soft_i2c_config[i].sda_pin);
}
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_i2c_init);
#endif /* RT_USING_I2C */
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