SPI operation

[!Note]

1. Currently only SV50PB module supports this function.
2. Before use, you need to enable the SPI function in the module configuration and upgrade with the generated new system package before it can be used normally.
3. More about the module Using Tutorial。

Introduce header files

  #include "utils/SpiHelper.h"

Specific operation

  // Required header files
  #include "utils/SpiHelper.h"

  static void testSpi() {
    uint8_t tx[512], rx[512];

    /**
     * Define variables
     *
     * Parameter 1: SPI bus number
     * Parameter 2: Mode, optional values: SPI_MODE_0, SPI_MODE_1, SPI_MODE 2, SPI_MODE_3
     * Parameter 3: SPI clock frequency, 50M is set here
     * Parameter 4: How many bits does a word have, default value: 8
     * Parameter 5: Bit order, true: means low bit first, false: means high bit first; default value: false, high bit first
     */
    SpiHelper spi(1, SPI_MODE_0, 50*1000*1000, 8, false);

    memset(tx, 0, 512);
    memset(rx, 0, 512);

    tx[0] = 0x4B;

    /**
     * Simplex write
     *
     * Parameter 1: Write data address
     * Parameter 2: Data length
     */
    if (!spi.write(tx, 5)) {
        LOGD("spi tx error!\n");
    }

    /**
     * Simplex read
     *
     * Parameter 1: Read data address
     * Parameter 2: Data length
     */
    if (!spi.read(rx, 8)) {
        LOGD("spi rx error!\n");
    }

    for (int i = 0; i < 8; i++) {
        LOGD("spi[%d]=0x%x\n", i, rx[i]);
    }

    /**
     * Half-duplex transmission
     *
     * Parameter 1: Write data address
     * Parameter 2: Write data length
     * Parameter 3: Read data address
     * Parameter 4: Read data length
     */
    if (!spi.halfduplexTransfer(tx, 5, rx, 8)) {
        LOGD("spi spi_halfduplex_transfer rx error!\n");
    }

    for (int i = 0; i < 8; i++) {
        LOGD("spi[%d]=0x%x\n", i, rx[i]);
    }
  }

For other interface operations, please refer to the header file notes.