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[add] 添加 软件IIC 驱动

This commit is contained in:
Sherman 2021-10-18 16:56:27 +08:00
parent 3e344b47ae
commit 1e880bc30a
4 changed files with 300 additions and 2 deletions
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9
bsp/ra6m4-cpk/.config
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@ -132,7 +132,10 @@ CONFIG_RT_SERIAL_USING_DMA=y
# CONFIG_RT_USING_CAN is not set
# CONFIG_RT_USING_HWTIMER is not set
# CONFIG_RT_USING_CPUTIME is not set
# CONFIG_RT_USING_I2C is not set
CONFIG_RT_USING_I2C=y
# CONFIG_RT_I2C_DEBUG is not set
CONFIG_RT_USING_I2C_BITOPS=y
# CONFIG_RT_I2C_BITOPS_DEBUG is not set
# CONFIG_RT_USING_PHY is not set
CONFIG_RT_USING_PIN=y
# CONFIG_RT_USING_ADC is not set
@ -580,6 +583,10 @@ CONFIG_BSP_USING_UART7=y
# CONFIG_BSP_UART7_TX_USING_DMA is not set
CONFIG_BSP_UART7_RX_BUFSIZE=256
CONFIG_BSP_UART7_TX_BUFSIZE=0
CONFIG_BSP_USING_I2C=y
CONFIG_BSP_USING_I2C1=y
CONFIG_BSP_I2C1_SCL_PIN=0x0512
CONFIG_BSP_I2C1_SDA_PIN=0x0511
#
# Board extended module Drivers

22
bsp/ra6m4-cpk/drivers/Kconfig
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@ -51,7 +51,27 @@ menu "Hardware Drivers Config"
endif
endif
menuconfig BSP_USING_I2C
bool "Enable I2C BUS"
default n
select RT_USING_I2C
select RT_USING_I2C_BITOPS
select RT_USING_PIN
if BSP_USING_I2C
menuconfig BSP_USING_I2C1
bool "Enable I2C1 BUS (software simulation)"
default y
if BSP_USING_I2C1
config BSP_I2C1_SCL_PIN
int "i2c1 scl pin number"
range 0x0000 0x0B0F
default 0x0512
config BSP_I2C1_SDA_PIN
int "I2C1 sda pin number"
range 0x0000 0x0B0F
default 0x0511
endif
endif
endmenu

218
bsp/ra6m4-cpk/drivers/drv_soft_i2c.c Normal file
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@ -0,0 +1,218 @@
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-07-29 KyleChan first version
*/
#include "board.h"
#include "drv_soft_i2c.h"
#include "drv_config.h"
#ifdef RT_USING_I2C
#define DBG_TAG "drv.i2c"
#ifdef DRV_DEBUG
#define DBG_LVL DBG_LOG
#else
#define DBG_LVL DBG_INFO
#endif /* DRV_DEBUG */
#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
static const struct ra_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_I2C0
I2C0_BUS_CONFIG,
#endif
#ifdef BSP_USING_I2C1
I2C1_BUS_CONFIG,
#endif
};
static struct ra_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/**
* This function initializes the i2c pin.
*
* @param ra i2c dirver class.
*/
static void ra_i2c_gpio_init(struct ra_i2c *i2c)
{
struct ra_soft_i2c_config* cfg = (struct ra_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 ra config class.
* @param The sda pin state.
*/
static void ra_set_sda(void *data, rt_int32_t state)
{
struct ra_soft_i2c_config* cfg = (struct ra_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 ra config class.
* @param The scl pin state.
*/
static void ra_set_scl(void *data, rt_int32_t state)
{
struct ra_soft_i2c_config* cfg = (struct ra_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 ra_get_sda(void *data)
{
struct ra_soft_i2c_config* cfg = (struct ra_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 ra_get_scl(void *data)
{
struct ra_soft_i2c_config* cfg = (struct ra_soft_i2c_config*)data;
return rt_pin_read(cfg->scl);
}
/**
* The time delay function.
*
* @param microseconds.
*/
static void ra_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 ra_bit_ops_default =
{
.data = RT_NULL,
.set_sda = ra_set_sda,
.set_scl = ra_set_scl,
.get_sda = ra_get_sda,
.get_scl = ra_get_scl,
.udelay = ra_udelay,
.delay_us = 1,
.timeout = 100
};
/**
* if i2c is locked, this function will unlock it
*
* @param ra config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t ra_i2c_bus_unlock(const struct ra_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);
ra_udelay(100);
rt_pin_write(cfg->scl, PIN_LOW);
ra_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_size_t obj_num = sizeof(i2c_obj) / sizeof(struct ra_i2c);
rt_err_t result;
for (int i = 0; i < obj_num; i++)
{
i2c_obj[i].ops = ra_bit_ops_default;
i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
ra_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);
ra_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 */

53
bsp/ra6m4-cpk/drivers/drv_soft_i2c.h Normal file
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@ -0,0 +1,53 @@
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-07-29 KyleChan first version
*/
#ifndef __DRV_I2C__
#define __DRV_I2C__
#include <rtthread.h>
#include <rthw.h>
#include <rtdevice.h>
#include <rtdbg.h>
/* ra config class */
struct ra_soft_i2c_config
{
rt_uint32_t scl;
rt_uint32_t sda;
const char *bus_name;
};
/* ra i2c dirver class */
struct ra_i2c
{
struct rt_i2c_bit_ops ops;
struct rt_i2c_bus_device i2c2_bus;
};
#ifdef BSP_USING_I2C1
#define I2C1_BUS_CONFIG \
{ \
.scl = BSP_I2C1_SCL_PIN, \
.sda = BSP_I2C1_SDA_PIN, \
.bus_name = "i2c1", \
}
#endif
#ifdef BSP_USING_I2C2
#define I2C2_BUS_CONFIG \
{ \
.scl = BSP_I2C2_SCL_PIN, \
.sda = BSP_I2C2_SDA_PIN, \
.bus_name = "i2c2", \
}
#endif
int rt_hw_i2c_init(void);
#endif