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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
* Copyright (c) 2022, Xiaohua Semiconductor Co., Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-04-28 CDT first version
*/
/*******************************************************************************
* Include files
******************************************************************************/
#include "drv_soft_i2c.h"
#include "board_config.h"
#if defined(RT_USING_I2C)
#if defined(BSP_USING_I2C1) || defined(BSP_USING_I2C2) || defined(BSP_USING_I2C3) || \
defined(BSP_USING_I2C4) || defined(BSP_USING_I2C5) || defined(BSP_USING_I2C6)
/*******************************************************************************
* Local type definitions ('typedef')
******************************************************************************/
/*******************************************************************************
* Local pre-processor symbols/macros ('#define')
******************************************************************************/
//#define DRV_DEBUG
#define LOG_TAG "drv.i2c"
#include <drv_log.h>
/*******************************************************************************
* Global variable definitions (declared in header file with 'extern')
******************************************************************************/
/*******************************************************************************
* Local function prototypes ('static')
******************************************************************************/
/*******************************************************************************
* Local variable definitions ('static')
******************************************************************************/
static const struct hc32_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_I2C1
I2C1_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C2
I2C2_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C3
I2C3_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C4
I2C4_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C5
I2C5_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C6
I2C6_BUS_CONFIG,
#endif
};
static struct hc32_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/*******************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
/**
* This function initializes the i2c pin.
*
* @param Hc32 i2c dirver class.
*/
static void hc32_i2c_gpio_init(struct hc32_i2c *i2c)
{
struct hc32_soft_i2c_config *cfg = (struct hc32_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);
}
/**
* This function sets the sda pin.
*
* @param Hc32 config class.
* @param The sda pin state.
*/
static void hc32_set_sda(void *data, rt_int32_t state)
{
struct hc32_soft_i2c_config *cfg = (struct hc32_soft_i2c_config *)data;
if (state)
{
rt_pin_write(cfg->sda_pin, PIN_HIGH);
}
else
{
rt_pin_write(cfg->sda_pin, PIN_LOW);
}
}
/**
* This function sets the scl pin.
*
* @param Hc32 config class.
* @param The scl pin state.
*/
static void hc32_set_scl(void *data, rt_int32_t state)
{
struct hc32_soft_i2c_config *cfg = (struct hc32_soft_i2c_config *)data;
if (state)
{
rt_pin_write(cfg->scl_pin, PIN_HIGH);
}
else
{
rt_pin_write(cfg->scl_pin, PIN_LOW);
}
}
/**
* This function gets the sda pin state.
*
* @param The sda pin state.
*/
static rt_int32_t hc32_get_sda(void *data)
{
struct hc32_soft_i2c_config *cfg = (struct hc32_soft_i2c_config *)data;
return rt_pin_read(cfg->sda_pin);
}
/**
* This function gets the scl pin state.
*
* @param The scl pin state.
*/
static rt_int32_t hc32_get_scl(void *data)
{
struct hc32_soft_i2c_config *cfg = (struct hc32_soft_i2c_config *)data;
return rt_pin_read(cfg->scl_pin);
}
/**
* The time delay function.
*
* @param microseconds.
*/
static void hc32_udelay(rt_uint32_t us)
{
rt_uint32_t ticks;
rt_uint32_t told, tnow, tcnt = 0;
rt_uint32_t reload = SysTick->LOAD;
ticks = us * reload / (1000000 / RT_TICK_PER_SECOND);
told = SysTick->VAL;
while (1)
{
tnow = SysTick->VAL;
if (tnow != told)
{
if (tnow < told)
{
tcnt += told - tnow;
}
else
{
tcnt += reload - tnow + told;
}
told = tnow;
if (tcnt >= ticks)
{
break;
}
}
}
}
static const struct rt_i2c_bit_ops hc32_bit_ops_default =
{
.data = RT_NULL,
.set_sda = hc32_set_sda,
.set_scl = hc32_set_scl,
.get_sda = hc32_get_sda,
.get_scl = hc32_get_scl,
.udelay = hc32_udelay,
.delay_us = 1,
.timeout = 100
};
/**
* if i2c is locked, this function will unlock it
*
* @param hc32 config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t hc32_i2c_bus_unlock(const struct hc32_soft_i2c_config *cfg)
{
rt_uint32_t i = 0;
if (PIN_LOW == rt_pin_read(cfg->sda_pin))
{
while (i++ < 9)
{
rt_pin_write(cfg->scl_pin, PIN_HIGH);
hc32_udelay(100);
rt_pin_write(cfg->scl_pin, PIN_LOW);
hc32_udelay(100);
}
}
if (PIN_LOW == rt_pin_read(cfg->sda_pin))
{
return -RT_ERROR;
}
return RT_EOK;
}
/* I2C initialization function */
int hc32_hw_i2c_init(void)
{
rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct hc32_i2c);
rt_err_t result;
for (int i = 0; i < obj_num; i++)
{
i2c_obj[i].ops = hc32_bit_ops_default;
i2c_obj[i].ops.data = (void *)&soft_i2c_config[i];
i2c_obj[i].i2c_bus.priv = &i2c_obj[i].ops;
hc32_i2c_gpio_init(&i2c_obj[i]);
result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c_bus, soft_i2c_config[i].bus_name);
RT_ASSERT(result == RT_EOK);
hc32_i2c_bus_unlock(&soft_i2c_config[i]);
}
return RT_EOK;
}
INIT_BOARD_EXPORT(hc32_hw_i2c_init);
#endif
#endif /* RT_USING_I2C */
/*******************************************************************************
* EOF (not truncated)
******************************************************************************/
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