/*
 * MTG RFID Companion - Shared SPI bus manager
 */

#include <string.h>
#include "esp_log.h"
#include "spi_bus_manager.h"
#include "hw_pins.h"

static const char *TAG = "spi_bus";

/* 240 x 80 rows x 2 bytes per pixel. Largest contiguous DMA transfer the
 * display engine will issue. */
#define HW_SPI_MAX_TRANSFER_SZ (240 * 80 * sizeof(uint16_t))

esp_err_t spi_bus_manager_init(void)
{
    spi_bus_config_t buscfg = {
        .sclk_io_num = HW_SPI_SCK_GPIO,
        .mosi_io_num = HW_SPI_MOSI_GPIO,
        .miso_io_num = HW_SPI_MISO_GPIO,
        .quadwp_io_num = -1,
        .quadhd_io_num = -1,
        .max_transfer_sz = HW_SPI_MAX_TRANSFER_SZ,
    };

    esp_err_t ret = spi_bus_initialize(HW_SPI_HOST, &buscfg, SPI_DMA_CH_AUTO);
    if (ret != ESP_OK) {
        ESP_LOGE(TAG, "spi_bus_initialize failed: %s", esp_err_to_name(ret));
        return ret;
    }
    ESP_LOGI(TAG, "SPI2_HOST ready: SCK=%d MOSI=%d MISO=%d",
             HW_SPI_SCK_GPIO, HW_SPI_MOSI_GPIO, HW_SPI_MISO_GPIO);
    return ESP_OK;
}