硬件spi从机接收为什么会传输失败，但是接收缓冲区又可以完整打印出来，

发布于 2025-02-13 16:30:48 浏览：14 订阅该版

```
[2] D/NO_TAG: SPI MASTER send successful!
 [31m[1006] E/drv.spi: SPI transfer error: 3 [0m[31m[1010] E/spi.core: SPI device spi30 transfer failed [0m
 SPI rx_buf : ???????????????123456787654321
```

为什么会传输失败，但是接收缓冲区又可以完整打印出来，以下是我的代码：

```c
#include "master_slave.h"

#define MASTER_BUS_NAME     "spi2"
#define MASTER_DEVICE_NAME "spi20"
#define MASTER_CS    GET_PIN(B, 12)

#define SLAVE_DEVICE_NAME "spi30"
#define SLAVE_BUS_NAME     "spi3"
#define SLAVE_CS    GET_PIN(A, 4)

#define BUFFER_SIZE  32

struct rt_spi_device *slave_device;
struct rt_spi_device *master_device;

void master_send_slave_recv(const char *str)
{
    rt_size_t len = strlen(str);
    rt_uint8_t tx_buf[len + 1],rx_buf[len + 1]; 
    memcpy(tx_buf, str, len);
		tx_buf[len ] = '\0';
	
    rt_ssize_t result =  rt_device_write( (rt_device_t) master_device, 0, tx_buf, len);
		if(result > 0)  
			LOG_D("SPI MASTER send successful!\n");
		
		rt_device_read((rt_device_t) slave_device, 0, rx_buf, len);
		rt_kprintf("\n SPI rx_buf : %s\n",rx_buf);
}

/* 主从机初始化并配置 */
void master_slave_init()
{
    rt_err_t result;	
//		__HAL_RCC_GPIOA_CLK_ENABLE();
//		__HAL_RCC_GPIOB_CLK_ENABLE();
	
		rt_hw_spi_device_attach(MASTER_BUS_NAME, MASTER_DEVICE_NAME, MASTER_CS);
		rt_hw_spi_device_attach(SLAVE_BUS_NAME, SLAVE_DEVICE_NAME, SLAVE_CS);
	
    master_device = (struct rt_spi_device *)rt_device_find(MASTER_DEVICE_NAME);
		slave_device = (struct rt_spi_device *)rt_device_find(SLAVE_DEVICE_NAME);
    if (master_device == NULL || slave_device == NULL)
    {
        rt_kprintf("spi failed! can't find %s device!\n", MASTER_DEVICE_NAME);
    }
    
    {		// 配置SPI2
				master_device->bus->owner = master_device;
				struct rt_spi_configuration cfg;
        cfg.data_width = 8;
        cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
        cfg.max_hz = 1 * 1000 *1000;                           /* 1M */
        result = rt_spi_configure(master_device, &cfg);
				if (result != RT_EOK)
					rt_kprintf("SPI2 configuration failed!\n");	
    }
    
    {		// 配置SPI3
				slave_device->bus->owner = slave_device;
				struct rt_spi_configuration cfg;
        cfg.data_width = 8;
        cfg.mode = RT_SPI_SLAVE | RT_SPI_MODE_0 | RT_SPI_MSB;
        cfg.max_hz = 1 * 1000 *1000;                           /* 1M */
        result = rt_spi_configure(slave_device, &cfg);
				if (result != RT_EOK)				
					rt_kprintf("SPI3 configuration failed!\n");		
    }	
		rt_device_open( (rt_device_t) master_device,  RT_DEVICE_FLAG_RDWR);
		rt_device_open( (rt_device_t) slave_device,  RT_DEVICE_FLAG_RDWR);
}

char tx_data[LEN] = "123456787654321";

int main(void)
{	
		master_slave_init();
		master_send_slave_recv(tx_data);
		return RT_EOK;
}
```

0 个回答

暂无答案，快来添加答案吧

撰写答案

关注者

0

被浏览

14

关于作者

xu123456

这家伙很懒，什么也没写！

提问

回答

被采纳

相关问题

1

rtt的SPI作从机怎么编程？我尝试了，收不到数据！

2

请问基于rt-thread的spi slave (从机)应该怎么做

3

spi dma 中断接收的问题

4

rt_thread_delay中，关/开中断，导致SPI从机接收时数据丢失

5

freemodbus 从机运行过程中怎么修改从机地址呢？

6

RT-Thread如何开启SPI中断

7

SPI配置为从模式，设备下电再上电，不能触发SPI中断

8

MCU采用PSI从设备通讯，发送数据到主设备，出现数据重复

9

Gd32 SPI从设备中断，有时无法收到数据，原因不明确

10

rt-thread的spi框架，rt_spi_transfer的详细功能细节理解

本月文章贡献

出出啊

1 篇文章 3 次点赞

小小李sunny

1 篇文章 1 次点赞

张世争

1 篇文章 3 次点赞

crystal266

2 篇文章 2 次点赞

whj467467222

2 篇文章 2 次点赞

回到
顶部

发布
问题

手机
浏览

扫码手机浏览

回到
底部