5 关于VS1053模块驱动问题

发布于 2022-08-17 20:33:05 浏览：682 订阅该版

1.STM32H743的SPI2连接VS1053模块，连接关系如下：
```c
    PC2_C     ------> SPI2_MISO
    PC3_C     ------> SPI2_MOSI
    PB13     ------> SPI2_SCK
		
		
#define XCS         GET_PIN(E,14)
#define XDCS        GET_PIN(B,12)
#define DREQ        GET_PIN(B,11)
#define XRST        GET_PIN(B,10)

```
2.根据文档中心示例编写部分测试代码
```c
static void spi_vs1053(int argc, char *argv[])
{
        rt_pin_mode(XCS, PIN_MODE_OUTPUT);
    rt_pin_mode(XDCS, PIN_MODE_OUTPUT);
    rt_pin_mode(DREQ, PIN_MODE_INPUT);
    rt_pin_mode(XRST, PIN_MODE_OUTPUT);

__HAL_RCC_GPIOB_CLK_ENABLE();
    rt_hw_spi_device_attach("spi2", "spi20", GPIOB, GPIO_PIN_12);
	
	struct rt_spi_device *spi_dev_vs1053;
    char name[RT_NAME_MAX];
    rt_uint8_t vs1053_buf = 0x02;
    rt_uint16_t vs1053_buf2 = 0xffff;
    rt_uint8_t id[2] = {0};

if (argc == 2)
    {
        rt_strncpy(name, argv[1], RT_NAME_MAX);
    }
    else
    {
        rt_strncpy(name, vs1053_SPI_DEVICE_NAME, RT_NAME_MAX);
    }

/* 查找 spi 设备获取设备句柄 */
    spi_dev_vs1053 = (struct rt_spi_device *)rt_device_find(name);
    if (!spi_dev_vs1053)
    {
        rt_kprintf("spi2 run failed! can't find %s device!\n", name);
    }
    else
    {
        rt_kprintf("spi2 run success! find %s device!\n", name);

// owner必须配置,因为默认为空,为空时无法进行初始化操作
        spi_dev_vs1053->bus->owner = spi_dev_vs1053; // 必须!!!
        // 配置spi
        struct rt_spi_configuration cfg;
        cfg.data_width = 8;
        cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;  // 主机,模式0,高位在前
        cfg.max_hz = 20 * 1000 * 1000; // SPI 接口时钟频率
        rt_spi_configure(spi_dev_vs1053, &cfg); // 此时才进行MspInit相关的时钟及IO口初始化

struct rt_spi_message msg1, msg2,msg3;

msg1.send_buf   = &vs1053_buf;
        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   = RT_NULL;
        msg2.length     = 1;
        msg2.cs_take    = 0;
        msg2.cs_release = 0;
        msg2.next       = &msg3;

msg3.send_buf   = &vs1053_buf2;
        msg3.recv_buf   = id;
        msg3.length     = 2;
        msg3.cs_take    = 0;
        msg3.cs_release = 1;
        msg3.next       = RT_NULL;

rt_spi_transfer_message(spi_dev_vs1053, &msg1);
        rt_kprintf("use rt_spi_transfer_message() read is:%x%x\n", id[1], id[2]);
    }
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(spi_vs1053, spi_vs1053);
```
运行出现错误：```c
spi_vs1053 spi20
spi2 run success! find spi20 device!
sys freq: 400000000, pclk2 freq: 400000000, SPI limiting freq: 20000000, BaudRatePrescaler: 1073741824
[32m[I/drv.spi] spi transfer error : 1[0m
use rt_spi_transfer_message() read is:00
```
目前最不明白的是像VS1053这种两个CS引脚的模块，在RTThread里具体要如何去驱动呢，在挂载device的时候只是一个cs引脚。如果有大佬做过的请赐教一下。。。