spi一个标准流程

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uint8_t cmd[10] = {0x55, 0x00, 0xB0, 0x99, 0x00, 0x00, 0x02, 0x00, 0x08, 0x00};     cmd[9] = getLRCx(&cmd[1], 8);     char sendbuf[10];     char recvbuf[10];       memcpy(sendbuf, cmd, 10);       // vSetSSN(0); //   vSetMOSI(1); //    vSetMISO(1);     //vSetSCK(1);       vSetSSN(0);     vTaskDelay(pdMS_TO_TICKS(100));     spi_transaction_t recv;     memset(&recv, 0, sizeof(recv));     recv.length = 10 * 8;     recv.rxlength = 10 * 8;     recv.rx_buffer = recvbuf;     esp_err_t ret = spi_device_polling_transmit(dev._SPIHandle, &recv);           spi_transaction_t SPITransaction;     memset(&SPITransaction, 0, sizeof(spi_transaction_t));     SPITransaction.length = 10 * 8;     SPITransaction.tx_buffer = sendbuf;     SPITransaction.rx_buffer = recvbuf;     ret = spi_device_transmit(dev._SPIHandle, &SPITransaction);     assert(ret == ESP_OK);     vTaskDelay(pdMS_TO_TICKS(5));     //  vTaskDelay(100);     vSetSSN(1);     vTaskDelay(pdMS_TO_TICKS(10));     vSetSSN(0);     vTaskDelay(pdMS_TO_TICKS(100));     if (_DEBUG_)         ESP_LOGI(TAG, "W25Q64_readStatusReg2=%x %x %x", recvbuf[0], recvbuf[1], recvbuf[2]);       uint8_t cmd2[1] = {};     char sendbuf2[1];     char recvbuf2[100];     memcpy(sendbuf2, cmd2, 1);        spi_transaction_t SPITransaction2;     memset(&SPITransaction2, 0, sizeof(spi_transaction_t));     SPITransaction2.length = 1 * 8;     SPITransaction2.tx_buffer = sendbuf2;     SPITransaction2.rx_buffer = recvbuf2;     ret = spi_device_transmit(dev._SPIHandle, &SPITransaction2);     assert(ret == ESP_OK);     if (_DEBUG_)         ESP_LOGI(TAG, "W25Q64_readStatusReg2=%x %x %x", recvbuf2[0], recvbuf2[1], recvbuf2[2]);