spi 接收一个字节

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uint8_t cmd2[1] = {0x00};  char sendbuf2[1];  char recvbuf2[1];  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); */    spi_transaction_t recv2;  memset(&recv2, 0, sizeof(recv2));  recv2.length = 1 * 8;  recv2.rxlength = 1 * 8;  recv2.rx_buffer = recvbuf2;  ret = spi_device_polling_transmit(dev._SPIHandle, &recv2);    assert(ret == ESP_OK);  if (_DEBUG_)      ESP_LOGI(TAG, "W25Q64_readStatusReg2=%x", recvbuf2[0]);