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/*
* Copyright (c) 2006-2022, Synwit Technology Co.,Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-07-01 lik first version
*/
#include "drv_soft_i2c.h"
#ifdef RT_USING_I2C
#ifdef BSP_USING_I2C
//#define DRV_DEBUG
#define LOG_TAG "drv.i2c"
#include <drv_log.h>
#if !defined(BSP_USING_I2C0) && !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
#ifdef BSP_USING_I2C0
#define I2C0_BUS_CFG \
{ \
.scl = BSP_I2C0_SCL_PIN, \
.sda = BSP_I2C0_SDA_PIN, \
.name = "i2c0", \
}
#endif
#ifdef BSP_USING_I2C1
#define I2C1_BUS_CFG \
{ \
.scl = BSP_I2C1_SCL_PIN, \
.sda = BSP_I2C1_SDA_PIN, \
.name = "i2c1", \
}
#endif
/* swm config class */
struct swm_soft_i2c_cfg
{
rt_uint8_t scl;
rt_uint8_t sda;
const char *name;
};
/* swm i2c dirver class */
struct swm_soft_i2c_device
{
struct rt_i2c_bit_ops ops;
struct rt_i2c_bus_device i2c_bus;
};
static const struct swm_soft_i2c_cfg swm_soft_i2c_cfg[] =
{
#ifdef BSP_USING_I2C0
I2C0_BUS_CFG,
#endif
#ifdef BSP_USING_I2C1
I2C1_BUS_CFG,
#endif
};
static struct swm_soft_i2c_device i2c_obj[sizeof(swm_soft_i2c_cfg) / sizeof(swm_soft_i2c_cfg[0])];
/**
* This function initializes the i2c pin.
*
* @param swm i2c dirver class.
*/
static void swm_i2c_gpio_init(struct swm_soft_i2c_device *i2c)
{
struct swm_soft_i2c_cfg *soft_i2c_cfg = (struct swm_soft_i2c_cfg *)i2c->ops.data;
rt_pin_mode(soft_i2c_cfg->scl, PIN_MODE_OUTPUT_OD);
rt_pin_mode(soft_i2c_cfg->sda, PIN_MODE_OUTPUT_OD);
rt_pin_write(soft_i2c_cfg->scl, PIN_HIGH);
rt_pin_write(soft_i2c_cfg->sda, PIN_HIGH);
}
/**
* This function sets the sda pin.
*
* @param swm config class.
* @param The sda pin state.
*/
static void swm_i2c_set_sda(void *data, rt_int32_t state)
{
struct swm_soft_i2c_cfg *soft_i2c_cfg = (struct swm_soft_i2c_cfg *)data;
rt_pin_mode(soft_i2c_cfg->sda, PIN_MODE_OUTPUT_OD);
if (state)
{
rt_pin_write(soft_i2c_cfg->sda, PIN_HIGH);
}
else
{
rt_pin_write(soft_i2c_cfg->sda, PIN_LOW);
}
}
/**
* This function sets the scl pin.
*
* @param swm config class.
* @param The scl pin state.
*/
static void swm_i2c_set_scl(void *data, rt_int32_t state)
{
struct swm_soft_i2c_cfg *soft_i2c_cfg = (struct swm_soft_i2c_cfg *)data;
rt_pin_mode(soft_i2c_cfg->scl, PIN_MODE_OUTPUT_OD);
if (state)
{
rt_pin_write(soft_i2c_cfg->scl, PIN_HIGH);
}
else
{
rt_pin_write(soft_i2c_cfg->scl, PIN_LOW);
}
}
/**
* This function gets the sda pin state.
*
* @param The sda pin state.
*/
static rt_int32_t swm_i2c_get_sda(void *data)
{
struct swm_soft_i2c_cfg *soft_i2c_cfg = (struct swm_soft_i2c_cfg *)data;
rt_pin_mode(soft_i2c_cfg->sda, PIN_MODE_INPUT_PULLDOWN);
return rt_pin_read(soft_i2c_cfg->sda);
}
/**
* This function gets the scl pin state.
*
* @param The scl pin state.
*/
static rt_int32_t swm_i2c_get_scl(void *data)
{
struct swm_soft_i2c_cfg *soft_i2c_cfg = (struct swm_soft_i2c_cfg *)data;
rt_pin_mode(soft_i2c_cfg->scl, PIN_MODE_INPUT_PULLDOWN);
return rt_pin_read(soft_i2c_cfg->scl);
}
/**
* The time delay function.
*
* @param microseconds.
*/
static void swm_i2c_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 swm_i2c_bit_ops =
{
.data = RT_NULL,
.set_sda = swm_i2c_set_sda,
.set_scl = swm_i2c_set_scl,
.get_sda = swm_i2c_get_sda,
.get_scl = swm_i2c_get_scl,
.udelay = swm_i2c_udelay,
.delay_us = 1,
.timeout = 100};
/* I2C initialization function */
int swm_i2c_init(void)
{
rt_err_t result;
for (int i = 0; i < sizeof(i2c_obj) / sizeof(struct swm_soft_i2c_device); i++)
{
i2c_obj[i].ops = swm_i2c_bit_ops;
i2c_obj[i].ops.data = (void *)&swm_soft_i2c_cfg[i];
i2c_obj[i].i2c_bus.priv = &i2c_obj[i].ops;
swm_i2c_gpio_init(&i2c_obj[i]);
result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c_bus, swm_soft_i2c_cfg[i].name);
RT_ASSERT(result == RT_EOK);
LOG_D("software simulation %s init done, pin scl: %d, pin sda %d",
swm_soft_i2c_cfg[i].name,
swm_soft_i2c_cfg[i].scl,
swm_soft_i2c_cfg[i].sda);
}
return RT_EOK;
}
INIT_DEVICE_EXPORT(swm_i2c_init);
#endif /* BSP_USING_I2C */
#endif /* RT_USING_I2C */
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