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[bsp][pico]add: drv_soft_i2c

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褚仕成 2023-06-01 23:18:21 +08:00 committed by supperthomas
parent e88a19467e
commit 761a28e4d9
3 changed files with 248 additions and 0 deletions
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177
bsp/raspberry-pico/drivers/drv_soft_i2c.c Normal file
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@ -0,0 +1,177 @@
/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023/06/01 chushicheng 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 pico_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_SOFT_I2C1
I2C1_BUS_CONFIG,
#endif
};
static struct pico_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/**
* This function initializes the i2c pin.
*
* @param pico i2c dirver class.
*/
static void pico_i2c_gpio_init(struct pico_i2c *i2c)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)i2c->ops.data;
rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
rt_pin_write(cfg->scl, PIN_HIGH);
rt_pin_write(cfg->sda, PIN_HIGH);
}
/**
* This function sets the sda pin.
*
* @param pico config class.
* @param The sda pin state.
*/
static void pico_set_sda(void *data, rt_int32_t state)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
if (state)
{
rt_pin_write(cfg->sda, PIN_HIGH);
}
else
{
rt_pin_write(cfg->sda, PIN_LOW);
}
}
/**
* This function sets the scl pin.
*
* @param pico config class.
* @param The scl pin state.
*/
static void pico_set_scl(void *data, rt_int32_t state)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
if (state)
{
rt_pin_write(cfg->scl, PIN_HIGH);
}
else
{
rt_pin_write(cfg->scl, PIN_LOW);
}
}
/**
* This function gets the sda pin state.
*
* @param The sda pin state.
*/
static rt_int32_t pico_get_sda(void *data)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
return rt_pin_read(cfg->sda);
}
/**
* This function gets the scl pin state.
*
* @param The scl pin state.
*/
static rt_int32_t pico_get_scl(void *data)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
return rt_pin_read(cfg->scl);
}
/**
* The time delay function.
*
* @param microseconds.
*/
static void pico_udelay(rt_uint32_t us)
{
busy_wait_us_32(us);
}
static const struct rt_i2c_bit_ops pico_bit_ops_default =
{
.data = RT_NULL,
.set_sda = pico_set_sda,
.set_scl = pico_set_scl,
.get_sda = pico_get_sda,
.get_scl = pico_get_scl,
.udelay = pico_udelay,
.delay_us = 1,
.timeout = 100
};
/**
* if i2c is locked, this function will unlock it
*
* @param pico config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t pico_i2c_bus_unlock(const struct pico_soft_i2c_config *cfg)
{
rt_int32_t i = 0;
if (PIN_LOW == rt_pin_read(cfg->sda))
{
while (i++ < 9)
{
rt_pin_write(cfg->scl, PIN_HIGH);
pico_udelay(100);
rt_pin_write(cfg->scl, PIN_LOW);
pico_udelay(100);
}
}
if (PIN_LOW == rt_pin_read(cfg->sda))
{
return -RT_ERROR;
}
return RT_EOK;
}
/* I2C initialization function */
int rt_soft_i2c_init(void)
{
rt_err_t result;
for (rt_size_t i = 0; i < sizeof(i2c_obj) / sizeof(struct pico_i2c); i++)
{
i2c_obj[i].ops = pico_bit_ops_default;
i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
pico_i2c_gpio_init(&i2c_obj[i]);
result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c2_bus, soft_i2c_config[i].bus_name);
RT_ASSERT(result == RT_EOK);
pico_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;
}
INIT_DEVICE_EXPORT(rt_soft_i2c_init);
#endif /* BSP_USING_SOFT_I2C */

46
bsp/raspberry-pico/drivers/drv_soft_i2c.h Normal file
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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023/06/01 chushicheng first version
*/
#ifndef __DRV_SOFT_I2C__
#define __DRV_SOFT_I2C__
#include <rtdevice.h>
#include "drv_gpio.h"
#include "board.h"
#ifdef BSP_USING_SOFT_I2C
/* pico i2c dirver class */
struct pico_i2c
{
struct rt_i2c_bit_ops ops;
struct rt_i2c_bus_device i2c2_bus;
};
/* pico config class */
struct pico_soft_i2c_config
{
rt_uint8_t scl;
rt_uint8_t sda;
const char *bus_name;
};
#ifdef BSP_USING_SOFT_I2C1
#define I2C1_BUS_CONFIG \
{ \
.scl = BSP_SOFT_I2C1_SCL_PIN, \
.sda = BSP_SOFT_I2C1_SDA_PIN, \
.bus_name = "i2c1", \
}
#endif
int rt_soft_i2c_init(void);
#endif /* BSP_USING_SOFT_I2C */
#endif

25
bsp/raspberry-pico/libraries/Kconfig
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@ -22,4 +22,29 @@ menu "Onboard Peripheral Drivers"
endif
endmenu
menu "On-chip Peripheral Drivers"
menuconfig BSP_USING_SOFT_I2C
bool "Enable I2C BUS (software simulation)"
default n
select RT_USING_I2C
select RT_USING_I2C_BITOPS
select RT_USING_PIN
if BSP_USING_SOFT_I2C
config BSP_USING_SOFT_I2C1
bool "Enable I2C1 Bus (software simulation)"
default n
if BSP_USING_SOFT_I2C1
config BSP_SOFT_I2C1_SCL_PIN
int "i2c1 scl pin number (GP)"
range 0 28
default 2
config BSP_SOFT_I2C1_SDA_PIN
int "I2C1 sda pin number (GP)"
range 0 28
default 3
endif
endif
endmenu
endmenu