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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023/01/17 chushicheng first version
*/
#include <board.h>
#include "drv_i2c.h"
#include "bl808_common.h"
#ifdef RT_USING_I2C
#define DBG_TAG "drv.i2c"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#if !defined(BSP_USING_I2C1)
#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 bl808_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_I2C1
I2C1_BUS_CONFIG,
#endif
};
static struct bl808_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/**
* This function initializes the i2c pin.
*
* @param bl808 i2c dirver class.
*/
static void bl808_i2c_gpio_init(struct bl808_i2c *i2c)
{
struct bl808_soft_i2c_config* cfg = (struct bl808_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);
}
/**
* This function sets the sda pin.
*
* @param bl808 config class.
* @param The sda pin state.
*/
static void bl808_set_sda(void *data, rt_int32_t state)
{
struct bl808_soft_i2c_config* cfg = (struct bl808_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 bl808 config class.
* @param The scl pin state.
*/
static void bl808_set_scl(void *data, rt_int32_t state)
{
struct bl808_soft_i2c_config* cfg = (struct bl808_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 bl808_get_sda(void *data)
{
struct bl808_soft_i2c_config* cfg = (struct bl808_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 bl808_get_scl(void *data)
{
struct bl808_soft_i2c_config* cfg = (struct bl808_soft_i2c_config*)data;
return rt_pin_read(cfg->scl);
}
/**
* The time delay function.
*
* @param microseconds.
*/
static void bl808_udelay(rt_uint32_t us)
{
arch_delay_us(us);
}
static const struct rt_i2c_bit_ops bl808_bit_ops_default =
{
.data = RT_NULL,
.set_sda = bl808_set_sda,
.set_scl = bl808_set_scl,
.get_sda = bl808_get_sda,
.get_scl = bl808_get_scl,
.udelay = bl808_udelay,
.delay_us = 1,
.timeout = 100
};
/**
* if i2c is locked, this function will unlock it
*
* @param bl808 config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t bl808_i2c_bus_unlock(const struct bl808_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);
bl808_udelay(100);
rt_pin_write(cfg->scl, PIN_LOW);
bl808_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 bl808_i2c); i++)
{
i2c_obj[i].ops = bl808_bit_ops_default;
i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
bl808_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);
bl808_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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