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我正在尝试将nRF24L01 库移植到 ESP32（我正在使用 esp-idf）。我所要做的就是替换使用 spi 的函数。我就是这样做的：

static uint8_t *create_tx(uint8_t cmd, const uint8_t *buff, uint8_t length){
    uint8_t *tx = (uint8_t*)heap_caps_malloc(64, MALLOC_CAP_DMA);
    tx[0] = cmd;
    if(buff != NULL)
        memcpy(tx + 1, buff, length);
    return tx;
}

uint8_t NRF24L01::Read(uint8_t cmd, uint8_t *pBuff, uint8_t length){
    uint8_t *recv = (uint8_t*)heap_caps_malloc(64, MALLOC_CAP_DMA);
    uint8_t *send = (uint8_t*)heap_caps_malloc(64, MALLOC_CAP_DMA);
    memset(send, NRF24_CMD_NOP, 32);

    send[0] = cmd;

    CSPIBuilder builder;
    spi_transaction_t t =
        builder
        .SetLength(length)
        .SetTx(send)
        .SetRx(recv)
        .build();

    spi_device_transmit(m_Spi, &t);

    memcpy(pBuff, recv + 1, length);
    uint8_t status = recv[0];
    free(recv);
    free(send);
    return status;
}
uint8_t NRF24L01::Write(uint8_t cmd, uint8_t *pBuff, uint8_t length){
    uint8_t *txBuff = create_tx(cmd, pBuff, length);
    uint8_t *rxBuff = (uint8_t*)heap_caps_malloc(64, MALLOC_CAP_DMA);
    memset(rxBuff, NRF24_CMD_NOP, length + 1);

    spi_transaction_t t = 
        CSPIBuilder()
        .SetLength(length)
        .SetTx(txBuff)
        .SetRx(rxBuff)
        .build();


    spi_device_transmit(m_Spi, &t);
    free(txBuff);
    uint8_t status = rxBuff[0];
    free(rxBuff);
    return status;
}

class CSPIBuilder{
public:
    CSPIBuilder(){
        memset(&t, 0, sizeof(t));
    }

    CSPIBuilder &UseTxData() { t.flags |= SPI_TRANS_USE_TXDATA; return *this; }
    CSPIBuilder &UseRxData() { t.flags |= SPI_TRANS_USE_RXDATA; return *this; }
    CSPIBuilder &UseTRxData() { t.flags |= SPI_TRANS_USE_TXDATA | SPI_TRANS_USE_RXDATA; return *this; }

    CSPIBuilder &SetLength(uint8_t length) { t.length = (length + 1) * 8; return *this; }
    CSPIBuilder &SetRxLength(uint8_t rxLength) { t.rxlength = (rxLength + 1) * 8; return *this; }

    CSPIBuilder &SetTx(uint8_t *txBuffer) { t.tx_buffer = txBuffer; return *this; }
    CSPIBuilder &SetRx(uint8_t *rxBuffer) { t.rx_buffer = rxBuffer; return *this; }

    spi_transaction_t build() {return t;}
private:
    spi_transaction_t t;
};

但是......没有任何工作。SPI 线连接正确。我可以通过 spi 读取状态。我无法确认它是正确的值，但每次我从 nRF24L01 断开 GND 时它都会发生变化。所以我觉得接线没问题。

这段代码有什么问题？

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1 回答 1

1

好吧，据我了解，本机 esp-idf spi api 存在很大问题。解决方案是用小事务逐字节替换完整的 spi 事务（超过 1 个字节）（因为 spi api 只能正确发送第一个字节（至少在我的情况下））。我还必须自己控制 CS 引脚并尊重数据表的时序

这些操作的结果是我自己的库（哈哈）随意使用它

于 2018-07-24T22:05:01.813 回答