求解STM32H750 SPI1作为从机回复错误的问题

yujiahang

遇到的问题：STM32H750 （从机）能正确收到主机的消息，但是不知道为什么回复给主机的不正确，请大佬们不吝解答，感谢！！！

连接方式：其他MCU（主机）<--SPI1-->  STM32H750 （从机）

出错部分代码：STM32H750通过HAL_SPI_TransmitReceive()的方式接收，buf2接收到的内容正确，buf1应该是[1，100]，但是主机收到的是100个0x02（通过逻辑分析仪证实）
                此函数返回HAL_TIMEOUT，通过调试发现__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXP)一直为0，可能压根没往发送寄存器里面写

1. for (size_t i = 0; i < 100; i++)
   
2. {
   
3.        buf1[i] = i + 1;
   
4. }
   
5. 
   
6. HAL_SPI_TransmitReceive(&hspi1, buf1, buf2, 100, 1000);

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1. while ((initial_TxXferCount > 0UL) || (initial_RxXferCount > 0UL))
   
2.     {
   
3.       /* Check the TXP flag */
   
4.       if ((__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXP)) && (initial_TxXferCount > 0UL))
   
5.       {
   
6.         *((__IO uint8_t *)&hspi->Instance->TXDR) = *((const uint8_t *)hspi->pTxBuffPtr);
   
7.         hspi->pTxBuffPtr += sizeof(uint8_t);
   
8.         hspi->TxXferCount--;
   
9.         initial_TxXferCount = hspi->TxXferCount;
   
10.       }
    
11. 
    
12.       /* Check the RXP flag */
    
13.       if ((__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_RXP)) && (initial_RxXferCount > 0UL))
    
14.       {
    
15.         *((uint8_t *)hspi->pRxBuffPtr) = *((__IO uint8_t *)&hspi->Instance->RXDR);
    
16.         hspi->pRxBuffPtr += sizeof(uint8_t);
    
17.         hspi->RxXferCount--;
    
18.         initial_RxXferCount = hspi->RxXferCount;
    
19.       }
    
20. 
    
21.       /* Timeout management */
    
22.       if ((((HAL_GetTick() - tickstart) >=  Timeout) && (Timeout != HAL_MAX_DELAY)) || (Timeout == 0U))
    
23.       {
    
24.         /* Call standard close procedure with error check */
    
25.         SPI_CloseTransfer(hspi);
    
26. 
    
27.         /* Unlock the process */
    
28.         __HAL_UNLOCK(hspi);
    
29. 
    
30.         SET_BIT(hspi->ErrorCode, HAL_SPI_ERROR_TIMEOUT);
    
31.         hspi->State = HAL_SPI_STATE_READY;
    
32.         return HAL_TIMEOUT;
    
33.       }
    
34.     }

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初始化代码：

1. void MX_SPI1_Slave_Init(void)
   
2. {
   
3. hspi1.Instance = SPI1;
   
4. hspi1.Init.Mode = SPI_MODE_SLAVE;
   
5. hspi1.Init.Direction = SPI_DIRECTION_2LINES;
   
6. hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
   
7. hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
   
8. hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
   
9. hspi1.Init.NSS = SPI_NSS_HARD_INPUT;
   
10. hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
    
11. hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
    
12. hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
    
13. hspi1.Init.CRCPolynomial = 0x0;
    
14. hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
    
15. hspi1.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
    
16. hspi1.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
    
17. hspi1.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
    
18. hspi1.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
    
19. hspi1.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_00CYCLE;
    
20. hspi1.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
    
21. hspi1.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;
    
22. hspi1.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_DISABLE;
    
23. hspi1.Init.IOSwap = SPI_IO_SWAP_DISABLE;
    
24. if (HAL_SPI_Init(&hspi1) != HAL_OK)
    
25. {
    
26. Error_Handler();
    
27. }
    
28. }

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xuande

看波形。