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rt-thread/components/drivers/i2c/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
* 2023-07-30 sp-cai first version
*/
#include <rtdevice.h>
#ifdef RT_USING_SOFT_I2C
#if !defined(RT_USING_SOFT_I2C1) && !defined(RT_USING_SOFT_I2C2) &&\
!defined(RT_USING_SOFT_I2C3) && !defined(RT_USING_SOFT_I2C4) &&\
!defined(RT_USING_SOFT_I2C5) && !defined(RT_USING_SOFT_I2C6) &&\
!defined(RT_USING_SOFT_I2C7) && !defined(RT_USING_SOFT_I2C8)
#error "Please define at least one RT_USING_SOFT_I2Cx"
/*
This driver can be disabled at:
menuconfig -> RT-Thread Components -> Device Drivers -> Using I2C device drivers
*/
#endif
#define DBG_ENABLE
#define DBG_TAG "I2C_S"
#ifdef RT_I2C_BITOPS_DEBUG
#define DBG_LEVEL DBG_LOG
#endif
#include <rtdbg.h>
/* i2c config class */
struct soft_i2c_config
{
rt_base_t scl_pin;
rt_base_t sda_pin;
const char *bus_name;
rt_uint16_t timing_delay; /* scl and sda line delay */
rt_uint16_t timing_timeout; /* in tick */
};
/* i2c dirver class */
struct rt_soft_i2c
{
struct rt_i2c_bus_device i2c_bus;
struct rt_i2c_bit_ops ops;
};
struct soft_i2c_config i2c_cfg[] =
{
#ifdef RT_USING_SOFT_I2C1
{
.scl_pin = RT_SOFT_I2C1_SCL_PIN,
.sda_pin = RT_SOFT_I2C1_SDA_PIN,
.bus_name = RT_SOFT_I2C1_BUS_NAME,
.timing_delay = RT_SOFT_I2C1_TIMING_DELAY,
.timing_timeout = RT_SOFT_I2C1_TIMING_TIMEOUT,
},
#endif //RT_USING_SOFT_I2C1
#ifdef RT_USING_SOFT_I2C2
{
.scl_pin = RT_SOFT_I2C2_SCL_PIN,
.sda_pin = RT_SOFT_I2C2_SDA_PIN,
.bus_name = RT_SOFT_I2C2_BUS_NAME,
.timing_delay = RT_SOFT_I2C2_TIMING_DELAY,
.timing_timeout = RT_SOFT_I2C2_TIMING_TIMEOUT,
},
#endif //RT_USING_SOFT_I2C2
#ifdef RT_USING_SOFT_I2C3
{
.scl_pin = RT_SOFT_I2C3_SCL_PIN,
.sda_pin = RT_SOFT_I2C3_SDA_PIN,
.bus_name = RT_SOFT_I2C3_BUS_NAME,
.timing_delay = RT_SOFT_I2C3_TIMING_DELAY,
.timing_timeout = RT_SOFT_I2C3_TIMING_TIMEOUT,
},
#endif //RT_USING_SOFT_I2C3
#ifdef RT_USING_SOFT_I2C4
{
.scl_pin = RT_SOFT_I2C4_SCL_PIN,
.sda_pin = RT_SOFT_I2C4_SDA_PIN,
.bus_name = RT_SOFT_I2C4_BUS_NAME,
.timing_delay = RT_SOFT_I2C4_TIMING_DELAY,
.timing_timeout = RT_SOFT_I2C4_TIMING_TIMEOUT,
},
#endif //RT_USING_SOFT_I2C4
#ifdef RT_USING_SOFT_I2C5
{
.scl_pin = RT_SOFT_I2C5_SCL_PIN,
.sda_pin = RT_SOFT_I2C5_SDA_PIN,
.bus_name = RT_SOFT_I2C5_BUS_NAME,
.timing_delay = RT_SOFT_I2C5_TIMING_DELAY,
.timing_timeout = RT_SOFT_I2C5_TIMING_TIMEOUT,
},
#endif //RT_USING_SOFT_I2C5
#ifdef RT_USING_SOFT_I2C6
{
.scl_pin = RT_SOFT_I2C6_SCL_PIN,
.sda_pin = RT_SOFT_I2C6_SDA_PIN,
.bus_name = RT_SOFT_I2C6_BUS_NAME,
.timing_delay = RT_SOFT_I2C6_TIMING_DELAY,
.timing_timeout = RT_SOFT_I2C6_TIMING_TIMEOUT,
},
#endif //RT_USING_SOFT_I2C6
#ifdef RT_USING_SOFT_I2C7
{
.scl_pin = RT_SOFT_I2C7_SCL_PIN,
.sda_pin = RT_SOFT_I2C7_SDA_PIN,
.bus_name = RT_SOFT_I2C7_BUS_NAME,
.timing_delay = RT_SOFT_I2C7_TIMING_DELAY,
.timing_timeout = RT_SOFT_I2C7_TIMING_TIMEOUT,
},
#endif //RT_USING_SOFT_I2C7
#ifdef RT_USING_SOFT_I2C8
{
.scl_pin = RT_SOFT_I2C8_SCL_PIN,
.sda_pin = RT_SOFT_I2C8_SDA_PIN,
.bus_name = RT_SOFT_I2C8_BUS_NAME,
.timing_delay = RT_SOFT_I2C8_TIMING_DELAY,
.timing_timeout = RT_SOFT_I2C8_TIMING_TIMEOUT,
},
#endif //RT_USING_SOFT_I2C8
};
static struct rt_soft_i2c i2c_bus_obj[sizeof(i2c_cfg) / sizeof(i2c_cfg[0])] =
{ 0 };
/**
* This function initializes the i2c pin.
* @param i2c config class.
*/
static void pin_init(const struct soft_i2c_config *cfg)
{
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 i2c config class.
* @param The sda pin state.
*/
static void set_sda(void *cfg, rt_int32_t value)
{
rt_pin_write(((const struct soft_i2c_config*)cfg)->sda_pin, value);
}
/**
* This function sets the scl pin.
* @param i2c config class.
* @param The sda pin state.
*/
static void set_scl(void *cfg, rt_int32_t value)
{
rt_pin_write(((const struct soft_i2c_config*)cfg)->scl_pin, value);
}
/**
* This function gets the sda pin state.
* @param i2c config class.
*/
static rt_int32_t get_sda(void *cfg)
{
return rt_pin_read(((const struct soft_i2c_config*)cfg)->sda_pin);
}
/**
* This function gets the scl pin state.
* @param i2c config class.
*/
static rt_int32_t get_scl(void *cfg)
{
return rt_pin_read(((const struct soft_i2c_config*)cfg)->scl_pin);
}
static const struct rt_i2c_bit_ops soft_i2c_ops =
{
.set_sda = set_sda,
.set_scl = set_scl,
.get_sda = get_sda,
.get_scl = get_scl,
.udelay = rt_hw_us_delay,
};
/**
* if i2c is locked, this function will unlock it
*
* @param i2c config class.
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t i2c_bus_unlock(const struct soft_i2c_config *cfg)
{
rt_ubase_t i = 0;
if(PIN_LOW == rt_pin_read(cfg->sda_pin))
{
while(i++ < 9)
{
rt_pin_write(cfg->scl_pin, PIN_HIGH);
rt_hw_us_delay(cfg->timing_delay);
rt_pin_write(cfg->scl_pin, PIN_LOW);
rt_hw_us_delay(cfg->timing_delay);
}
}
if(PIN_LOW == rt_pin_read(cfg->sda_pin))
{
return -RT_ERROR;
}
return RT_EOK;
}
/* I2C initialization function */
int rt_soft_i2c_init(void)
{
int err = RT_EOK;
struct rt_soft_i2c *obj;
int i;
for(i = 0; i < sizeof(i2c_bus_obj) / sizeof(i2c_bus_obj[0]); i++)
{
struct soft_i2c_config *cfg = &i2c_cfg[i];
pin_init(cfg);
obj = &i2c_bus_obj[i];
obj->ops = soft_i2c_ops;
obj->ops.data = cfg;
obj->i2c_bus.priv = &obj->ops;
obj->ops.delay_us = cfg->timing_delay;
obj->ops.timeout = cfg->timing_timeout;
if(rt_i2c_bit_add_bus(&obj->i2c_bus, cfg->bus_name) == RT_EOK)
{
i2c_bus_unlock(cfg);
LOG_D("Software simulation %s init done"
", SCL pin: 0x%02X, SDA pin: 0x%02X"
, cfg->bus_name
, cfg->scl_pin
, cfg->sda_pin
);
}
else
{
err++;
LOG_E("Software simulation %s init fail"
", SCL pin: 0x%02X, SDA pin: 0x%02X"
, cfg->bus_name
, cfg->scl_pin
, cfg->sda_pin
);
}
}
return err;
}
INIT_PREV_EXPORT(rt_soft_i2c_init);
#endif // RT_USING_SOFT_I2C
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