#include "zh_mcp23s17.h"

#define SPI_HOST (SPI_HOST_MAX - 1)

spi_device_handle_t mcp23s17_handle = NULL;

// To speed up transfers, every SPI transfer sends a bunch of lines. This define specifies how many. More means more memory use,
// but less overhead for setting up / finishing transfers. Make sure 240 is dividable by this.
#define PARALLEL_LINES 16

void app_main(void)
{
    esp_err_t ret;
    spi_device_handle_t spi;
    spi_bus_config_t buscfg = {
        .miso_io_num = 25,
        .mosi_io_num = 23,
        .sclk_io_num = 19,
        .quadwp_io_num = -1,
        .quadhd_io_num = -1,
        .max_transfer_sz = 16 * 320 * 2 + 8};

    spi_device_interface_config_t devcfg = {
        .clock_speed_hz = 10 * 1000 * 1000, // Clock out at 10 MHz
        .mode = 0,                          // SPI mode 0
        .spics_io_num = 22,                 // CS pin
        .queue_size = 7,                    // We want to be able to queue 7 transactions at a time
        // .pre_cb = lcd_spi_pre_transfer_callback, // Specify pre-transfer callback to handle D/C line
    };
    // Initialize the SPI bus
    ret = spi_bus_initialize(SPI_HOST, &buscfg, SPI_DMA_CH_AUTO);
    ESP_ERROR_CHECK(ret);
    // Attach the LCD to the SPI bus
    ret = spi_bus_add_device(SPI_HOST, &devcfg, &mcp23s17_handle);
    ESP_ERROR_CHECK(ret);
}