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[bsp][bl] add drv_soft_i2c (#7406)
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@Z8MAN8
Z8MAN8 authored Apr 29, 2023
1 parent 1dac7db commit 0c55c4d
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Showing 4 changed files with 308 additions and 3 deletions.
52 changes: 51 additions & 1 deletion bsp/bouffalo_lab/libraries/rt_drivers/Kconfig
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Expand Up @@ -174,6 +174,56 @@ menu "General Drivers Configuration"
config BSP_USING_ON_CHIP_FLASH
bool "Enable on-chip FLASH"
default n

menu "General Purpose I2C"

menuconfig BSP_USING_I2C1
bool "Enable I2C1"
default n
select BSP_USING_I2C
select RT_USING_I2C
select RT_USING_I2C_BITOPS
select RT_USING_PIN
if BSP_USING_I2C1
choice
prompt "I2C1 SCL PIN"
default I2C1_SCL_USING_GPIO4 if BSP_USING_BL60X
default I2C1_SCL_USING_GPIO10 if BSP_USING_BL61X
default I2C1_SCL_USING_GPIO08 if BSP_USING_BL70X
default I2C1_SCL_USING_GPIO20 if BSP_USING_BL808

config I2C1_SCL_USING_GPIO0
bool "GPIO_0"
config I2C1_SCL_USING_GPIO4
bool "GPIO_4"
config I2C1_SCL_USING_GPIO8
bool "GPIO_8"
config I2C1_SCL_USING_GPIO10
bool "GPIO_10"
config I2C1_SCL_USING_GPIO20
bool "GPIO_20"

endchoice
choice
prompt "I2C1 SDA PIN"
default I2C1_SDA_USING_GPIO3 if BSP_USING_BL60X
default I2C1_SDA_USING_GPIO11 if BSP_USING_BL61X
default I2C1_SDA_USING_GPIO7 if BSP_USING_BL70X
default I2C1_SDA_USING_GPIO21 if BSP_USING_BL808

config I2C1_SDA_USING_GPIO1
bool "GPIO_1"
config I2C1_SDA_USING_GPIO3
bool "GPIO_3"
config I2C1_SDA_USING_GPIO7
bool "GPIO_7"
config I2C1_SDA_USING_GPIO11
bool "GPIO_11"
config I2C1_SDA_USING_GPIO21
bool "GPIO_21"

endchoice
endif
endmenu

endmenu

4 changes: 2 additions & 2 deletions bsp/bouffalo_lab/libraries/rt_drivers/SConscript
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Expand Up @@ -9,8 +9,8 @@ CPPPATH = [cwd]
if GetDepend('BSP_USING_GPIO'):
src += ['drv_gpio.c']

if GetDepend('BSP_USING_I2C'):
src += ['drv_i2c.c']
if GetDepend('RT_USING_I2C'):
src += ['drv_soft_i2c.c']

if GetDepend('BSP_USING_ADC'):
src += ['drv_adc.c']
Expand Down
211 changes: 211 additions & 0 deletions bsp/bouffalo_lab/libraries/rt_drivers/drv_soft_i2c.c
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@@ -0,0 +1,211 @@
/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023/04/15 chushicheng first version
*/

#include "drv_soft_i2c.h"
#include "bflb_gpio.h"
#include "bflb_common.h"

#ifdef RT_USING_I2C
#define DBG_LEVEL DBG_LOG
#include <rtdbg.h>
#define LOG_TAG "DRV.I2C"

#if !defined(BSP_USING_I2C1) && !defined(BSP_USING_I2C2)
#error "Please define at least one BSP_USING_I2Cx"
/* this driver can be disabled at menuconfig -> RT-Thread Components -> Device Drivers */
#endif

// uart1
#ifdef I2C1_SCL_USING_GPIO0
#define BSP_I2C1_SCL_PIN GPIO_PIN_0
#elif defined(I2C1_SCL_USING_GPIO4)
#define BSP_I2C1_SCL_PIN GPIO_PIN_4
#elif defined(I2C1_SCL_USING_GPIO8)
#define BSP_I2C1_SCL_PIN GPIO_PIN_8
#elif defined(I2C1_SCL_USING_GPIO10)
#define BSP_I2C1_SCL_PIN GPIO_PIN_10
#elif defined(I2C1_SCL_USING_GPIO20)
#define BSP_I2C1_SCL_PIN GPIO_PIN_20
#endif

#ifdef I2C1_SDA_USING_GPIO1
#define BSP_I2C1_SDA_PIN GPIO_PIN_1
#elif defined(I2C1_SDA_USING_GPIO3)
#define BSP_I2C1_SDA_PIN GPIO_PIN_3
#elif defined(I2C1_SDA_USING_GPIO7)
#define BSP_I2C1_SDA_PIN GPIO_PIN_7
#elif defined(I2C1_SDA_USING_GPIO11)
#define BSP_I2C1_SDA_PIN GPIO_PIN_11
#elif defined(I2C1_SDA_USING_GPIO21)
#define BSP_I2C1_SDA_PIN GPIO_PIN_21
#endif

static const struct bl_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_I2C1
I2C1_BUS_CONFIG,
#endif
};

static struct bl_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];

/**
* This function initializes the i2c pin.
*
* @param bl i2c dirver class.
*/
static void bl_i2c_gpio_init(struct bl_i2c *i2c)
{
struct bl_soft_i2c_config* cfg = (struct bl_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 bl config class.
* @param The sda pin state.
*/
static void bl_set_sda(void *data, rt_int32_t state)
{
struct bl_soft_i2c_config* cfg = (struct bl_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 bl config class.
* @param The scl pin state.
*/
static void bl_set_scl(void *data, rt_int32_t state)
{
struct bl_soft_i2c_config* cfg = (struct bl_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 bl_get_sda(void *data)
{
struct bl_soft_i2c_config* cfg = (struct bl_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 bl_get_scl(void *data)
{
struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
return rt_pin_read(cfg->scl);
}

/**
* The time delay function.
*
* @param microseconds.
*/
static void bl_udelay(rt_uint32_t us)
{
arch_delay_us(us);
}

static const struct rt_i2c_bit_ops bl_bit_ops_default =
{
.data = RT_NULL,
.set_sda = bl_set_sda,
.set_scl = bl_set_scl,
.get_sda = bl_get_sda,
.get_scl = bl_get_scl,
.udelay = bl_udelay,
.delay_us = 1,
.timeout = 100
};

/**
* if i2c is locked, this function will unlock it
*
* @param bl config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t bl_i2c_bus_unlock(const struct bl_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);
bl_udelay(100);
rt_pin_write(cfg->scl, PIN_LOW);
bl_udelay(100);
}
}
if (PIN_LOW == rt_pin_read(cfg->sda))
{
return -RT_ERROR;
}

return RT_EOK;
}

/* I2C initialization function */
int rt_hw_i2c_init(void)
{
rt_err_t result;

for (rt_size_t i = 0; i < sizeof(i2c_obj) / sizeof(struct bl_i2c); i++)
{
i2c_obj[i].ops = bl_bit_ops_default;
i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
bl_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);
bl_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_BOARD_EXPORT(rt_hw_i2c_init);

#endif /* RT_USING_I2C */
44 changes: 44 additions & 0 deletions bsp/bouffalo_lab/libraries/rt_drivers/drv_soft_i2c.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,44 @@
/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023/04/15 chushicheng first version
*/

#ifndef __DRV_I2C__
#define __DRV_I2C__

#include <rtthread.h>
#include <rthw.h>
#include <rtdevice.h>

/* bl i2c dirver class */
struct bl_i2c
{
struct rt_i2c_bit_ops ops;
struct rt_i2c_bus_device i2c2_bus;
};

/* bl config class */
struct bl_soft_i2c_config
{
rt_uint8_t scl;
rt_uint8_t sda;
const char *bus_name;
};

#ifdef BSP_USING_I2C1
#define I2C1_BUS_CONFIG \
{ \
.scl = BSP_I2C1_SCL_PIN, \
.sda = BSP_I2C1_SDA_PIN, \
.bus_name = "i2c1", \
}
#endif

int rt_hw_i2c_init(void);

#endif

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