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【NuMaker-M2354试用】spi测试分享

发布于 2021-12-20 21:06:25 浏览：887 订阅该版

[tocm]

##功能模块的硬件介绍
SPI是串行外设接口（Serial Peripheral Interface）的缩写，是一种高速的，全双工，同步的通信总线，并且在芯片的管脚上只占用四根线，节约了芯片的管脚，同时为PCB的布局上节省空间，提供方便，正是出于这种简单易用的特性，越来越多的芯片集成了这种通信协议，比如AT91RM9200。
##功能模块的使用说明
### 工程创建
rtthread的numaker-m2354工程模板是下载的其他大佬修改好了的工程，[https://gitee.com/werper/nu-maker-m2354_-test。]
### 工程裁剪
![image.png](https://oss-club.rt-thread.org/uploads/20211220/e1d8648be323de6a6a1267b84915d51a.png.webp)
### 查看spi1总线是否使能
![image.png](https://oss-club.rt-thread.org/uploads/20211220/a0ee69cb54c81de3d85e5b56a2892cc8.png)
### 挂载spi外设
```
#include <rtthread.h>
#include "spi_flash.h"
#include "spi_flash_sfud.h"
#include "drv_spi.h"
#include "drv_gpio.h"

static int rt_hw_spi_flash_init(void)
{
      rt_err_t result;
    
		struct rt_spi_device *spi_device;	
		char *bus_name="spi0";
		char *device_name="spi01";
	  char *spi_flash_dev_name="W25Q128";

nutool_modclkcfg_init_gpa();
    
    CLK_EnableModuleClock(SPI0_MODULE);
    /* Select SPI0 peripheral clock source as PCLK1 */
    CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL2_SPI0SEL_PCLK1, MODULE_NoMsk);

/*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/        
    SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA3MFP_Msk | SYS_GPA_MFPL_PA2MFP_Msk | SYS_GPA_MFPL_PA1MFP_Msk | SYS_GPA_MFPL_PA0MFP_Msk);
    SYS->GPA_MFPL |= (SYS_GPA_MFPL_PA3MFP_SPI0_SS | SYS_GPA_MFPL_PA2MFP_SPI0_CLK | SYS_GPA_MFPL_PA1MFP_SPI0_MISO | SYS_GPA_MFPL_PA0MFP_SPI0_MOSI);
    SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA3MFP_Msk | SYS_GPA_MFPL_PA2MFP_Msk | SYS_GPA_MFPL_PA1MFP_Msk | SYS_GPA_MFPL_PA0MFP_Msk);

/* attach the device to spi bus*/
    spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
    RT_ASSERT(spi_device != RT_NULL);

result=rt_spi_bus_attach_device(spi_device,device_name,bus_name,RT_NULL);
    if (result != RT_EOK)
    {
        LOG_E("%s attach to %s faild, %d\n", device_name, bus_name, result);
    }
        
    RT_ASSERT(result == RT_EOK);

LOG_D("%s attach to %s done", device_name, bus_name);

if (RT_NULL == rt_sfud_flash_probe(spi_flash_dev_name, device_name))
    {
        return -RT_ERROR;
    }

return RT_EOK;
}
INIT_COMPONENT_EXPORT(rt_hw_spi_flash_init);
```
参考官方spi示例写代码
```
/*
 * 程序清单：这是一个 SPI 设备使用例程
 * 例程导出了 spi_w25q_sample 命令到控制终端
 * 命令调用格式：spi_w25q_sample spi10
 * 命令解释：命令第二个参数是要使用的SPI设备名称，为空则使用默认的SPI设备
 * 程序功能：通过SPI设备读取 w25q 的 ID 数据
*/

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

#define W25Q_SPI_DEVICE_NAME     "qspi10"

static void spi_w25q_sample(int argc, char *argv[])
{
    struct rt_spi_device *spi_dev_w25q;
    char name[RT_NAME_MAX];
    rt_uint8_t w25x_read_id = 0x90;
    rt_uint8_t id[5] = {0};

if (argc == 2)
    {
        rt_strncpy(name, argv[1], RT_NAME_MAX);
    }
    else
    {
        rt_strncpy(name, W25Q_SPI_DEVICE_NAME, RT_NAME_MAX);
    }

/* 查找 spi 设备获取设备句柄 */
    spi_dev_w25q = (struct rt_spi_device *)rt_device_find(name);
    if (!spi_dev_w25q)
    {
        rt_kprintf("spi sample run failed! can't find %s device!\n", name);
    }
    else
    {
        /* 方式1：使用 rt_spi_send_then_recv()发送命令读取ID */
        rt_spi_send_then_recv(spi_dev_w25q, &w25x_read_id, 1, id, 5);
        rt_kprintf("use rt_spi_send_then_recv() read w25q ID is:%x%x\n", id[3], id[4]);

/* 方式2：使用 rt_spi_transfer_message()发送命令读取ID */
        struct rt_spi_message msg1, msg2;

msg1.send_buf   = &w25x_read_id;
        msg1.recv_buf   = RT_NULL;
        msg1.length     = 1;
        msg1.cs_take    = 1;
        msg1.cs_release = 0;
        msg1.next       = &msg2;

msg2.send_buf   = RT_NULL;
        msg2.recv_buf   = id;
        msg2.length     = 5;
        msg2.cs_take    = 0;
        msg2.cs_release = 1;
        msg2.next       = RT_NULL;

rt_spi_transfer_message(spi_dev_w25q, &msg1);
        rt_kprintf("use rt_spi_transfer_message() read w25q ID is:%x%x\n", id[3], id[4]);

}
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(spi_w25q_sample, spi w25q sample);

```
##心得体会
买的spi传感器还没有到，暂时没有没有测试读取数据，但是spi使能，挂载，完全没有问题，rt已经将spi的驱动，读写完成调用函数就行非常方便，待传感器回来，补上更新。参考大佬文章https://club.rt-thread.org/ask/article/3219.html。