STM32F0 用SPI2,读写异常

发布于 2019-12-30 15:47:56 浏览：1532 订阅该版

初始化成功的，读写也是成功的，但是数据就是不对，示波器一量，引脚都没发生变化，读出来数据都是0xFF!
static void rt_hw_spi_rn8209_init(void)
{
	
	struct rt_spi_configuration cfg;

if(rt_hw_spi_device_attach("spi2", "spi20", GPIOB, GPIO_PIN_12) != RT_EOK)
        rt_kprintf("挂载spi2失败<br>");
    spi2_rn8209 = (struct rt_spi_device *)rt_device_find("spi20");
    if(spi2_rn8209 == RT_NULL)
	{
		rt_kprintf("查找rn8209 SPI设备失败<br>");
		return ;
	}
	else 
		rt_kprintf("查找rn8209 SPI设备成功<br>");

cfg.data_width = 8;
    cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
    cfg.max_hz = 1 * 1000 *1000;   	/*3M*/
	rt_spi_configure(spi2_rn8209, &cfg);
    fnRN8209_WriteEnable();
}

void fnRN8209_WriteEnable(void)
{
	uint8_t temp[2] = {0xEA,0xE5};
	struct rt_spi_message msg1,msg2;
	/*命令字*/
	msg1.send_buf   = &temp[0];
	msg1.recv_buf   = RT_NULL;
	msg1.length     = 1;
	msg1.cs_take    = 1;
	msg1.cs_release = 0;
	msg1.next       = &msg2;
	/*数据*/
	msg2.send_buf   = &temp[1];
	msg2.recv_buf   = RT_NULL;
	msg2.length     = 1;
	msg2.cs_take    = 0;
	msg2.cs_release = 1;
	msg2.next       = RT_NULL;
	if(rt_spi_transfer_message(spi2_rn8209, &msg1)!=RT_NULL)
        rt_kprintf("写使能失败<br>");
}

/* USER CODE END SPI2_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_SPI2_CLK_ENABLE();

__HAL_RCC_GPIOB_CLK_ENABLE();
    /**SPI2 GPIO Configuration    
    PB12     ------> SPI2_NSS
    PB13     ------> SPI2_SCK
    PB14     ------> SPI2_MISO
    PB15     ------> SPI2_MOSI 
    */
    GPIO_InitStruct.Pin = GPIO_PIN_14;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF0_SPI2;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_15;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF0_SPI2;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

都没有报异常！这是什么情况??