sensor_main/source/hw_config.c

#include "hw_config.h"

#include "diskio.h"
#include "ff.h"  // FatFs
#include "hardware/spi.h"

// 1. SPI hardware + pin config
static spi_t spi1_config = {
    .hw_inst = spi1,
    .sck_gpio = 10,
    .mosi_gpio = 11,
    .miso_gpio = 12,
    .baud_rate = 10 * 1000 * 1000  // 10 MHz is safe to start
};

// 2. SPI interface for SD card
static sd_spi_if_t spi_if = {
    .spi = &spi1_config,
    .ss_gpio = 9,
    .set_drive_strength = false  // set to true and configure if needed
};

static sd_card_t sd_card = {
    .type = SD_IF_SPI, .spi_if_p = &spi_if, .use_card_detect = false};

/**
 * @brief Get the number of SD cards.
 *
 * @return The number of SD cards, which is 1 in this case.
 */
size_t sd_get_num() { return 1; }

/**
 * @brief Get a pointer to an SD card object by its number.
 *
 * @param[in] num The number of the SD card to get.
 *
 * @return A pointer to the SD card object, or @c NULL if the number is invalid.
 */
sd_card_t* sd_get_by_num(size_t num) {
  if (0 == num) {
    // The number 0 is a valid SD card number.
    // Return a pointer to the sd_card object.
    return &sd_card;
  } else {
    // The number is invalid. Return @c NULL.
    return NULL;
  }
}