thanhbinh89 / pn532-esp-idf Goto Github PK

void pn532_spi_init(pn532_t *obj, spi_host_device_t spiHostDevice, uint8_t ss) {

    gpio_set_direction((gpio_num_t) ss, GPIO_MODE_OUTPUT);
    gpio_set_level((gpio_num_t) ss, 1);

    //Config Frequency and SS GPIO
    spi_device_interface_config_t deviceInterfaceConfig = {
            .mode=0,  //SPI mode 0
            .clock_speed_hz= 2000 * 1000,  // Uusually 1.2 Mhz
            .input_delay_ns = 0,
            .spics_io_num = ss,
            .flags = SPI_DEVICE_BIT_LSBFIRST,
            .queue_size = 1
    };

    spi_device_handle_t spiDeviceHandle;

    //Attach the EPD to the SPI bus
    ESP_ERROR_CHECK(spi_bus_add_device(spiHostDevice, &deviceInterfaceConfig, &spiDeviceHandle));

    obj->spi = spiDeviceHandle;
    obj->_ss = ss;

}


void pn532_spi_write(pn532_t *obj, uint8_t data) {
    spi_transaction_t t;
    memset(&t, 0, sizeof(t));       //Zero out the transaction
    t.length = 8;
    t.tx_buffer = &data;
    t.flags = (SPI_TRANS_CS_KEEP_ACTIVE); // instead of gpio_set_level(obj->_ss, 0); and gpio_set_level(obj->_ss, 1); I'm using spi_device_acquire_bus(obj->spi,portMAX_DELAY); and spi_device_release_bus(obj->spi);.

    ESP_LOGI(TAG, "send data: 0x%02x", data);

    ESP_ERROR_CHECK(spi_device_polling_transmit(obj->spi, &t));

}


uint8_t pn532_spi_read(pn532_t *obj) {

    uint8_t data = 1;
    spi_transaction_t t;
    memset(&t, 0, sizeof(t));       //Zero out the transaction
    t.length = 8;
    t.rxlength = 8;
    t.tx_buffer = NULL;
    t.rx_buffer = &data;
    t.flags = (SPI_TRANS_CS_KEEP_ACTIVE); // instead of gpio_set_level(obj->_ss, 0); and gpio_set_level(obj->_ss, 1); I'm using spi_device_acquire_bus(obj->spi,portMAX_DELAY); and spi_device_release_bus(obj->spi);.

    ESP_ERROR_CHECK(spi_device_polling_transmit(obj->spi, &t));

    ESP_LOGI(TAG, "read data: 0x%02x", data);

    return data;

}