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rt-thread-official/bsp/bouffalo_lab/libraries/rt_drivers/drv_soft_i2c.c

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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023/04/15 chushicheng first version
*/
#include "drv_soft_i2c.h"
#include "bflb_gpio.h"
#include "bflb_common.h"
#ifdef BSP_USING_SOFT_I2C1
#define DBG_LEVEL DBG_LOG
#include <rtdbg.h>
#define LOG_TAG "DRV.I2C"
// i2c1
#ifdef SOFT_I2C1_SCL_USING_GPIO0
#define BSP_I2C1_SCL_PIN GPIO_PIN_0
#elif defined(SOFT_I2C1_SCL_USING_GPIO2)
#define BSP_I2C1_SCL_PIN GPIO_PIN_2
#elif defined(SOFT_I2C1_SCL_USING_GPIO4)
#define BSP_I2C1_SCL_PIN GPIO_PIN_4
#elif defined(SOFT_I2C1_SCL_USING_GPIO6)
#define BSP_I2C1_SCL_PIN GPIO_PIN_6
#elif defined(SOFT_I2C1_SCL_USING_GPIO8)
#define BSP_I2C1_SCL_PIN GPIO_PIN_8
#elif defined(SOFT_I2C1_SCL_USING_GPIO10)
#define BSP_I2C1_SCL_PIN GPIO_PIN_10
#elif defined(SOFT_I2C1_SCL_USING_GPIO12)
#define BSP_I2C1_SCL_PIN GPIO_PIN_12
#elif defined(SOFT_I2C1_SCL_USING_GPIO14)
#define BSP_I2C1_SCL_PIN GPIO_PIN_14
#elif defined(SOFT_I2C1_SCL_USING_GPIO16)
#define BSP_I2C1_SCL_PIN GPIO_PIN_16
#elif defined(SOFT_I2C1_SCL_USING_GPIO18)
#define BSP_I2C1_SCL_PIN GPIO_PIN_18
#elif defined(SOFT_I2C1_SCL_USING_GPIO20)
#define BSP_I2C1_SCL_PIN GPIO_PIN_20
#elif defined(SOFT_I2C1_SCL_USING_GPIO22)
#define BSP_I2C1_SCL_PIN GPIO_PIN_22
#elif defined(SOFT_I2C1_SCL_USING_GPIO24)
#define BSP_I2C1_SCL_PIN GPIO_PIN_24
#elif defined(SOFT_I2C1_SCL_USING_GPIO26)
#define BSP_I2C1_SCL_PIN GPIO_PIN_26
#elif defined(SOFT_I2C1_SCL_USING_GPIO28)
#define BSP_I2C1_SCL_PIN GPIO_PIN_28
#elif defined(SOFT_I2C1_SCL_USING_GPIO30)
#define BSP_I2C1_SCL_PIN GPIO_PIN_30
#elif defined(SOFT_I2C1_SCL_USING_GPIO32)
#define BSP_I2C1_SCL_PIN GPIO_PIN_32
#elif defined(SOFT_I2C1_SCL_USING_GPIO34)
#define BSP_I2C1_SCL_PIN GPIO_PIN_34
#elif defined(SOFT_I2C1_SCL_USING_GPIO36)
#define BSP_I2C1_SCL_PIN GPIO_PIN_36
#elif defined(SOFT_I2C1_SCL_USING_GPIO38)
#define BSP_I2C1_SCL_PIN GPIO_PIN_38
#elif defined(SOFT_I2C1_SCL_USING_GPIO40)
#define BSP_I2C1_SCL_PIN GPIO_PIN_40
#elif defined(SOFT_I2C1_SCL_USING_GPIO42)
#define BSP_I2C1_SCL_PIN GPIO_PIN_42
#elif defined(SOFT_I2C1_SCL_USING_GPIO44)
#define BSP_I2C1_SCL_PIN GPIO_PIN_44
#endif
#ifdef SOFT_I2C1_SDA_USING_GPIO1
#define BSP_I2C1_SDA_PIN GPIO_PIN_1
#elif defined(SOFT_I2C1_SDA_USING_GPIO3)
#define BSP_I2C1_SDA_PIN GPIO_PIN_3
#elif defined(SOFT_I2C1_SDA_USING_GPIO5)
#define BSP_I2C1_SDA_PIN GPIO_PIN_5
#elif defined(SOFT_I2C1_SDA_USING_GPIO7)
#define BSP_I2C1_SDA_PIN GPIO_PIN_7
#elif defined(SOFT_I2C1_SDA_USING_GPIO9)
#define BSP_I2C1_SDA_PIN GPIO_PIN_9
#elif defined(SOFT_I2C1_SDA_USING_GPIO11)
#define BSP_I2C1_SDA_PIN GPIO_PIN_11
#elif defined(SOFT_I2C1_SDA_USING_GPIO13)
#define BSP_I2C1_SDA_PIN GPIO_PIN_13
#elif defined(SOFT_I2C1_SDA_USING_GPIO15)
#define BSP_I2C1_SDA_PIN GPIO_PIN_15
#elif defined(SOFT_I2C1_SDA_USING_GPIO17)
#define BSP_I2C1_SDA_PIN GPIO_PIN_17
#elif defined(SOFT_I2C1_SDA_USING_GPIO19)
#define BSP_I2C1_SDA_PIN GPIO_PIN_19
#elif defined(SOFT_I2C1_SDA_USING_GPIO21)
#define BSP_I2C1_SDA_PIN GPIO_PIN_21
#elif defined(SOFT_I2C1_SDA_USING_GPIO23)
#define BSP_I2C1_SDA_PIN GPIO_PIN_23
#elif defined(SOFT_I2C1_SDA_USING_GPIO25)
#define BSP_I2C1_SDA_PIN GPIO_PIN_25
#elif defined(SOFT_I2C1_SDA_USING_GPIO27)
#define BSP_I2C1_SDA_PIN GPIO_PIN_27
#elif defined(SOFT_I2C1_SDA_USING_GPIO29)
#define BSP_I2C1_SDA_PIN GPIO_PIN_29
#elif defined(SOFT_I2C1_SDA_USING_GPIO31)
#define BSP_I2C1_SDA_PIN GPIO_PIN_31
#elif defined(SOFT_I2C1_SDA_USING_GPIO33)
#define BSP_I2C1_SDA_PIN GPIO_PIN_33
#elif defined(SOFT_I2C1_SDA_USING_GPIO35)
#define BSP_I2C1_SDA_PIN GPIO_PIN_35
#elif defined(SOFT_I2C1_SDA_USING_GPIO37)
#define BSP_I2C1_SDA_PIN GPIO_PIN_37
#elif defined(SOFT_I2C1_SDA_USING_GPIO39)
#define BSP_I2C1_SDA_PIN GPIO_PIN_39
#elif defined(SOFT_I2C1_SDA_USING_GPIO41)
#define BSP_I2C1_SDA_PIN GPIO_PIN_41
#elif defined(SOFT_I2C1_SDA_USING_GPIO43)
#define BSP_I2C1_SDA_PIN GPIO_PIN_43
#elif defined(SOFT_I2C1_SDA_USING_GPIO45)
#define BSP_I2C1_SDA_PIN GPIO_PIN_45
#endif
static const struct bl_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_SOFT_I2C1
I2C1_BUS_CONFIG,
#endif
};
static struct bl_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/**
* This function initializes the i2c pin.
*
* @param bl i2c dirver class.
*/
static void bl_i2c_gpio_init(struct bl_i2c *i2c)
{
struct bl_soft_i2c_config* cfg = (struct bl_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);
}
static void bl_i2c_pin_init(void)
{
rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct bl_i2c);
for(rt_size_t i = 0; i < obj_num; i++)
{
bl_i2c_gpio_init(&i2c_obj[i]);
}
}
/**
* This function sets the sda pin.
*
* @param bl config class.
* @param The sda pin state.
*/
static void bl_set_sda(void *data, rt_int32_t state)
{
struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
if (state)
{
rt_pin_write(cfg->sda, PIN_HIGH);
}
else
{
rt_pin_write(cfg->sda, PIN_LOW);
}
}
/**
* This function sets the scl pin.
*
* @param bl config class.
* @param The scl pin state.
*/
static void bl_set_scl(void *data, rt_int32_t state)
{
struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
if (state)
{
rt_pin_write(cfg->scl, PIN_HIGH);
}
else
{
rt_pin_write(cfg->scl, PIN_LOW);
}
}
/**
* This function gets the sda pin state.
*
* @param The sda pin state.
*/
static rt_int32_t bl_get_sda(void *data)
{
struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
return rt_pin_read(cfg->sda);
}
/**
* This function gets the scl pin state.
*
* @param The scl pin state.
*/
static rt_int32_t bl_get_scl(void *data)
{
struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
return rt_pin_read(cfg->scl);
}
/**
* The time delay function.
*
* @param microseconds.
*/
static void bl_udelay(rt_uint32_t us)
{
bflb_mtimer_delay_us(us);
}
static const struct rt_i2c_bit_ops bl_bit_ops_default =
{
.data = RT_NULL,
.pin_init = bl_i2c_pin_init,
.set_sda = bl_set_sda,
.set_scl = bl_set_scl,
.get_sda = bl_get_sda,
.get_scl = bl_get_scl,
.udelay = bl_udelay,
.delay_us = 1,
.timeout = 100,
.i2c_pin_init_flag = RT_FALSE
};
/**
* if i2c is locked, this function will unlock it
*
* @param bl config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t bl_i2c_bus_unlock(const struct bl_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);
bl_udelay(100);
rt_pin_write(cfg->scl, PIN_LOW);
bl_udelay(100);
}
}
if (PIN_LOW == rt_pin_read(cfg->sda))
{
return -RT_ERROR;
}
return RT_EOK;
}
/* I2C initialization function */
int rt_hw_i2c_init(void)
{
rt_err_t result;
for (rt_size_t i = 0; i < sizeof(i2c_obj) / sizeof(struct bl_i2c); i++)
{
i2c_obj[i].ops = bl_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);
bl_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 /* BSP_USING_SOFT_I2C1 */
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