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spi自动初始化程序

发布于 2024-05-11 11:08:33 浏览：273 订阅该版

```c
/*****
 *本文件为通用的SPI初始化BSP使用环境RTT
 *自动初始化结构体数组表中注册的设备，只修改表即可
 *表中有两个回调函数，可根据实际情况添加。下方添加了两个回调函数参考。
 *其他线程想使用SPI设备只需要rt_device_find设备返回句柄后即可使用。
**********/
#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#ifdef BSP_USING_SPI
#include "drv_spi.h"
typedef struct {
    const char *spi_name;   	//挂载的总线名称
    const char *spi_dev_name;   //挂载的设备名称
    uint32_t cs_pin;			//CS引脚
    rt_uint8_t mode;			//模式可使用或的形式
    rt_uint8_t data_width;		//数据宽度
    rt_uint32_t max_hz;			//频率
    void (*CallBlack1)(uint8_t index);//回调函数
    void (*CallBlack2)(uint8_t index);//回调函数
} Spi_struct;
static void call_black1_test(uint8_t index);//回调函数参考。
static void call_black2_test(uint8_t index);//回调函数参考。
/***********
SPI结构体数组表根据实际情况更改此表即可
*************/
const Spi_struct spi_struct_par[] = {//按实际情况更改此表数据
//----总线-------设备名------CS引脚--------------模式---------------------------------数据位---频率-------回调函数1-------------回调函数2
    {"spi1",	"spi10",	GET_PIN(C, 4),	RT_SPI_MODE_0 | RT_SPI_MSB,	8,	20000 * 1000,	call_black1_test,	call_black2_test},
    {"spi1",	"spi11",	GET_PIN(B, 1),	RT_SPI_MODE_0 | RT_SPI_MSB,	8,	20000 * 1000,	call_black1_test,	call_black2_test},
	{"spi2",	"spi20",	GET_PIN(D, 9),	RT_SPI_MODE_0 | RT_SPI_MSB,	8,	20000 * 1000,	call_black1_test,	call_black2_test},
    {"spi2",	"spi21",	GET_PIN(D, 12),	RT_SPI_MODE_0 | RT_SPI_MSB,	8,	20000 * 1000,	call_black1_test,	call_black2_test},
	{"spi3",	"spi30",	GET_PIN(D, 3),	RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB,	8,	1000 * 1000,	call_black1_test,	call_black2_test},
};
uint8_t spi_dev_num = sizeof(spi_struct_par)/sizeof(spi_struct_par[0]);//计算表的长度
//回调函数参考。
static void call_black1_test(uint8_t index)
{
    rt_kprintf("init %s device begin.\n",spi_struct_par[index].spi_dev_name);
}
//回调函数参考。
static void call_black2_test(uint8_t index)
{
    rt_kprintf("init %s device end.\n",spi_struct_par[index].spi_dev_name);
}
/**************************************
函数名:spi_init
作  用:初始化spi该函数被自动调用
参  数:
返回值:
*****************************************/
static int spi_init(void)
{
    struct rt_spi_device *spi_device = RT_NULL;//设备句柄
    struct rt_spi_configuration cfg;//模式配置结构体
    for(uint8_t i = 0; i < spi_dev_num; i++)
    {
        if(spi_struct_par[i].CallBlack1 != RT_NULL)
            (spi_struct_par[i].CallBlack1)(i);//调用回调函数
        rt_pin_mode(spi_struct_par[i].cs_pin, PIN_MODE_OUTPUT);
        rt_hw_spi_device_attach(spi_struct_par[i].spi_name,spi_struct_par[i].spi_dev_name,spi_struct_par[i].cs_pin); //注册spi1x设备
        spi_device = (struct rt_spi_device *)rt_device_find(spi_struct_par[i].spi_dev_name);//查找注册的设备
        if (!spi_device)
            rt_kprintf("spi sample run failed! can't find %s device!\n", spi_struct_par[i].spi_dev_name);
        else
        {
            {   //模式设置结构体
                cfg.data_width = spi_struct_par[i].data_width;
                cfg.mode = spi_struct_par[i].mode;
                cfg.max_hz = spi_struct_par[i].max_hz;
                rt_spi_configure(spi_device, &cfg);
            }
            if(spi_struct_par[i].CallBlack2 != RT_NULL)
                (*spi_struct_par[i].CallBlack2)(i);//调用回调函数
        }
    }
    return RT_EOK;
}

INIT_DEVICE_EXPORT(spi_init);//自动初始化
#endif

```