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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023/12/01 Raman Gopalan First version
*/
#include "drv_soft_i2c.h"
#ifdef BSP_USING_SOFT_I2C
#define DBG_LEVEL DBG_LOG
#include <rtdbg.h>
#define LOG_TAG "DRV.I2C"
static const struct avr32_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_SOFT_I2C1
I2C1_BUS_CONFIG,
#endif
};
static struct avr32_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/**
* This function initializes the I2C pin.
*
* @param AVR32 I2C driver class.
*/
static void avr32_i2c_gpio_init(struct avr32_i2c *i2c)
{
struct avr32_soft_i2c_config* cfg = (struct avr32_soft_i2c_config*)i2c->ops.data;
rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
gpio_set_gpio_open_drain_pin(cfg->scl);
rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
gpio_set_gpio_open_drain_pin(cfg->sda);
}
static void avr32_i2c_pin_init(void)
{
rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct avr32_i2c);
for(rt_size_t i = 0; i < obj_num; i++)
{
avr32_i2c_gpio_init(&i2c_obj[i]);
}
}
/**
* This function sets the SDA pin.
*
* @param AVR32 config class.
* @param The SDA pin state.
*/
static void avr32_set_sda(void *data, rt_int32_t state)
{
struct avr32_soft_i2c_config* cfg = (struct avr32_soft_i2c_config*)data;
if (state)
{
gpio_set_gpio_open_drain_pin(cfg->sda);
}
else
{
gpio_clr_gpio_open_drain_pin(cfg->sda);
}
}
/**
* This function sets the SCL pin.
*
* @param AVR32 config class.
* @param The SCL pin state.
*/
static void avr32_set_scl(void *data, rt_int32_t state)
{
struct avr32_soft_i2c_config* cfg = (struct avr32_soft_i2c_config*)data;
if (state)
{
gpio_set_gpio_open_drain_pin(cfg->scl);
}
else
{
gpio_clr_gpio_open_drain_pin(cfg->scl);
}
}
/**
* This function gets the SDA pin state.
*
* @param The SDA pin state.
*/
static rt_int32_t avr32_get_sda(void *data)
{
struct avr32_soft_i2c_config* cfg = (struct avr32_soft_i2c_config*)data;
return gpio_get_gpio_open_drain_pin_output_value(cfg->sda);
}
/**
* This function gets the SCL pin state.
*
* @param The SCL pin state.
*/
static rt_int32_t avr32_get_scl(void *data)
{
struct avr32_soft_i2c_config* cfg = (struct avr32_soft_i2c_config*)data;
return gpio_get_gpio_open_drain_pin_output_value(cfg->scl);
}
static const struct rt_i2c_bit_ops avr32_bit_ops_default =
{
.data = RT_NULL,
.pin_init = avr32_i2c_pin_init,
.set_sda = avr32_set_sda,
.set_scl = avr32_set_scl,
.get_sda = avr32_get_sda,
.get_scl = avr32_get_scl,
.udelay = rt_hw_us_delay,
.delay_us = 1,
.timeout = 100,
.i2c_pin_init_flag = RT_FALSE
};
/**
* If I2C is locked, this function will unlock it.
*
* @param AVR32 config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t avr32_i2c_bus_unlock(const struct avr32_soft_i2c_config *cfg)
{
rt_int32_t i = 0;
if (PIN_LOW == gpio_get_gpio_open_drain_pin_output_value(cfg->sda))
{
while (i++ < 9)
{
gpio_set_gpio_open_drain_pin(cfg->scl);
rt_hw_us_delay(100);
gpio_clr_gpio_open_drain_pin(cfg->scl);
rt_hw_us_delay(100);
}
}
if (PIN_LOW == gpio_get_gpio_open_drain_pin_output_value(cfg->sda))
{
return -RT_ERROR;
}
return RT_EOK;
}
/* I2C initialization function */
int rt_sw_i2c_init(void)
{
rt_err_t result;
rt_size_t i;
for (i = 0; i < sizeof(i2c_obj) / sizeof(struct avr32_i2c); i++)
{
i2c_obj[i].ops = avr32_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);
avr32_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;
}
#endif /* BSP_USING_SOFT_I2C */
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