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/*
* Copyright (c) 2026 HPMicro
*
* SPDX-License-Identifier: BSD-3-Clause
*
*/
#include "drv_soft_i2c.h"
#include <rtthread.h>
#include <rthw.h>
#include <rtdevice.h>
#include "rtt_board.h"
#ifdef BSP_USING_SOFT_I2C
#define DBG_TAG "drv.soft_i2c"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
/*
* I2C device structure initialization macro
* This macro initializes a soft I2C configuration structure with pin names and bus name
* Usage: I2C_INIT_STRUCT(n) where n is the I2C number (1-8)
*/
#define I2C_INIT_STRUCT(n) \
{ \
.scl_pin_name = BSP_SOFT_I2C##n##_SCL_PIN, \
.sda_pin_name = BSP_SOFT_I2C##n##_SDA_PIN, \
.bus_name = "soft_i2c"#n, \
}
/*
* Dynamically build configuration array using weak symbol.
* Users define I2C configuration macros in board.h or rtconfig.h:
#define I2C1_BUS_CONFIG \
{ \
.scl = "PD20", \
.sda = "PD21", \
.bus_name = "i2c1", \
}
*/
ATTR_WEAK struct hpm_soft_i2c_config soft_i2c_configs[] = {
#if defined(BSP_USING_SOFT_I2C0)
I2C_INIT_STRUCT(0),
#endif
#if defined(BSP_USING_SOFT_I2C1)
I2C_INIT_STRUCT(1),
#endif
#if defined(BSP_USING_SOFT_I2C2)
I2C_INIT_STRUCT(2),
#endif
#if defined(BSP_USING_SOFT_I2C3)
I2C_INIT_STRUCT(3),
#endif
#if defined(BSP_USING_SOFT_I2C4)
I2C_INIT_STRUCT(4),
#endif
#if defined(BSP_USING_SOFT_I2C5)
I2C_INIT_STRUCT(5),
#endif
#if defined(BSP_USING_SOFT_I2C6)
I2C_INIT_STRUCT(6),
#endif
#if defined(BSP_USING_SOFT_I2C7)
I2C_INIT_STRUCT(7),
#endif
#if defined(BSP_USING_SOFT_I2C8)
I2C_INIT_STRUCT(8),
#endif
};
/* Number of soft I2C devices configured */
#define SOFT_I2C_PTRS_NUM (sizeof(soft_i2c_configs) / sizeof(soft_i2c_configs[0]))
static struct hpm_i2c i2c_obj[SOFT_I2C_PTRS_NUM];
/**
* This function initializes the i2c pin.
*
* @param hpm i2c driver class.
*/
static void hpm_i2c_gpio_init(struct hpm_i2c *i2c)
{
struct hpm_soft_i2c_config* cfg = (struct hpm_soft_i2c_config*)i2c->ops.data;
rt_base_t scl_pin = rt_pin_get(cfg->scl_pin_name);
rt_base_t sda_pin = rt_pin_get(cfg->sda_pin_name);
if (scl_pin < 0 || sda_pin < 0)
{
LOG_E("i2c bus %s pin init error!", cfg->bus_name);
return;
}
rt_pin_mode(scl_pin, PIN_MODE_OUTPUT_OD);
rt_pin_mode(sda_pin, PIN_MODE_OUTPUT_OD);
rt_pin_write(scl_pin, PIN_HIGH);
rt_pin_write(sda_pin, PIN_HIGH);
}
static void hpm_i2c_pin_init(void)
{
rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct hpm_i2c);
for(rt_size_t i = 0; i < obj_num; i++)
{
hpm_i2c_gpio_init(&i2c_obj[i]);
}
}
/**
* This function sets the sda pin.
*
* @param hpm config class.
* @param The sda pin state.
*/
static void hpm_set_sda(void *data, rt_int32_t state)
{
struct hpm_soft_i2c_config* cfg = (struct hpm_soft_i2c_config*)data;
rt_base_t sda_pin = rt_pin_get(cfg->sda_pin_name);
if (state)
{
rt_pin_write(sda_pin, PIN_HIGH);
}
else
{
rt_pin_write(sda_pin, PIN_LOW);
}
}
/**
* This function sets the scl pin.
*
* @param hpm config class.
* @param The scl pin state.
*/
static void hpm_set_scl(void *data, rt_int32_t state)
{
struct hpm_soft_i2c_config* cfg = (struct hpm_soft_i2c_config*)data;
rt_base_t scl_pin = rt_pin_get(cfg->scl_pin_name);
if (state)
{
rt_pin_write(scl_pin, PIN_HIGH);
}
else
{
rt_pin_write(scl_pin, PIN_LOW);
}
}
/**
* This function gets the sda pin state.
*
* @param The sda pin state.
*/
static rt_int32_t hpm_get_sda(void *data)
{
struct hpm_soft_i2c_config* cfg = (struct hpm_soft_i2c_config*)data;
rt_base_t sda_pin = rt_pin_get(cfg->sda_pin_name);
return rt_pin_read(sda_pin);
}
/**
* This function gets the scl pin state.
*
* @param The scl pin state.
*/
static rt_int32_t hpm_get_scl(void *data)
{
struct hpm_soft_i2c_config* cfg = (struct hpm_soft_i2c_config*)data;
rt_base_t scl_pin = rt_pin_get(cfg->scl_pin_name);
return rt_pin_read(scl_pin);
}
static const struct rt_i2c_bit_ops hpm_bit_ops_default =
{
.data = RT_NULL,
.pin_init = hpm_i2c_pin_init,
.set_sda = hpm_set_sda,
.set_scl = hpm_set_scl,
.get_sda = hpm_get_sda,
.get_scl = hpm_get_scl,
.udelay = rt_hw_us_delay,
.delay_us = BSP_USING_SOFT_I2C_TIMING_DELAY_US,
.timeout = BSP_USING_SOFT_I2C_TIMING_TIMEOUT,
.i2c_pin_init_flag = RT_FALSE
};
/**
* if i2c is locked, this function will unlock it
*
* @param hpm config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t hpm_i2c_bus_unlock(const struct hpm_soft_i2c_config *cfg)
{
rt_int32_t i = 0;
rt_base_t sda_pin = rt_pin_get(cfg->sda_pin_name);
rt_base_t scl_pin = rt_pin_get(cfg->scl_pin_name);
if (PIN_LOW == rt_pin_read(sda_pin))
{
while (i++ < 9)
{
rt_pin_write(scl_pin, PIN_HIGH);
rt_hw_us_delay(100);
rt_pin_write(scl_pin, PIN_LOW);
rt_hw_us_delay(100);
}
}
if (PIN_LOW == rt_pin_read(sda_pin))
{
return -RT_ERROR;
}
return RT_EOK;
}
/* I2C initialization function */
int rt_software_i2c_init(void)
{
rt_err_t result = RT_EOK;
for (rt_size_t i = 0; i < SOFT_I2C_PTRS_NUM; i++)
{
if ((soft_i2c_configs[i].scl_pin_name == RT_NULL)
|| (soft_i2c_configs[i].sda_pin_name == RT_NULL))
{
LOG_E("soft i2c%d pin config error!", i);
result = -RT_ERROR;
continue;
}
if ((rt_strcmp(soft_i2c_configs[i].scl_pin_name, "None") == 0)
|| (rt_strcmp(soft_i2c_configs[i].sda_pin_name, "None") == 0))
{
LOG_E("soft i2c%d pin name is None, please check!", i);
result = -RT_ERROR;
continue;
}
i2c_obj[i].ops = hpm_bit_ops_default;
i2c_obj[i].ops.data = (void*)&soft_i2c_configs[i];
i2c_obj[i].i2c_bus.priv = &i2c_obj[i].ops;
result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c_bus, soft_i2c_configs[i].bus_name);
RT_ASSERT(result == RT_EOK);
hpm_i2c_bus_unlock(&soft_i2c_configs[i]);
LOG_D("software simulation %s init done, pin scl: %s, pin sda %s",
soft_i2c_configs[i].bus_name,
soft_i2c_configs[i].scl_pin_name,
soft_i2c_configs[i].sda_pin_name);
}
return result;
}
INIT_BOARD_EXPORT(rt_software_i2c_init);
#endif /* BSP_USING_SOFT_I2C */
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