Simplify the data structure to get SD/MMC to SPI mode, and use SPI

functions instead of direct GPIO access

extdrv/sdmmc.c

@@ -165,28 +165,23 @@ static int sdmmc_send_app_command(const struct sdmmc_card* mmc, uint8_t index, u
 	return sdmmc_send_command(mmc, index, arg, NULL, 0);
 }
 
+#define MMC_TO_SPI_BYTES  10 /* We need at least 74 bit : 10 x 8 bits is OK */
 void sdmmc_set_card_to_spi_mode(const struct sdmmc_card* mmc)
 {
-	int i = 0;
+	uint8_t mmcdata[MMC_TO_SPI_BYTES];
+
 	/* Get SPI Bus */
 	spi_get_mutex(mmc->ssp_bus_num);
 
-	/* Set SPI pins to GPIO mode */
-	set_pins(mmc->pin_cfg_mode_gpio);
-	/* Configure GPIOs */
+	/* Configure Chip Sslect GPIO */
 	config_gpio(&(mmc->chip_select), LPC_IO_MODE_PULL_UP, GPIO_DIR_OUT, 1);
-	config_gpio(&(mmc->sclk), LPC_IO_MODE_PULL_UP, GPIO_DIR_OUT, 1);
-	config_gpio(&(mmc->mosi), LPC_IO_MODE_PULL_UP, GPIO_DIR_OUT, 1);
 
 	/* Toggle SCLK to get 74 clock cycles while holding MOSI and CS high */
+	/* CS high */
 	gpio_set(mmc->chip_select);
-	gpio_set(mmc->mosi);
-	for (i = 0; i < (80 * 2); i++) {
-		gpio_toggle(mmc->sclk);
-	}
-
-	/* Set SPI pins to GPIO mode */
-	set_pins(mmc->pin_cfg_mode_spi);
+	/* Send 10 bytes of 0xFF, which makes MOSI High */
+	memset(mmcdata, 0xFF, MMC_TO_SPI_BYTES);
+	spi_transfer_multiple_frames(mmc->ssp_bus_num, mmcdata, NULL, MMC_TO_SPI_BYTES, 8);
 
 	/* Release SPI Bus */
 	spi_release_mutex(mmc->ssp_bus_num);

include/extdrv/sdmmc.h

@@ -36,11 +36,6 @@ struct sdmmc_card {
 	uint16_t block_size;
 	uint8_t block_shift;
 	struct pio chip_select;
-	struct pio sclk;
-	struct pio mosi;
-	struct pio miso;
-	struct pio_config* pin_cfg_mode_spi;
-	struct pio_config* pin_cfg_mode_gpio;
 };