feat(sdmmc_host): force pull-up DAT3 for SD 4-bit mode so that slave will not fall into SPI mode.
@@ -40,6 +40,7 @@ typedef struct {
uint32_t d5;
uint32_t d6;
uint32_t d7;
+ uint8_t d3_gpio;
uint8_t card_detect;
uint8_t write_protect;
uint8_t width;
@@ -57,6 +58,7 @@ static const sdmmc_slot_info_t s_slot_info[2] = {
.d1 = PERIPHS_IO_MUX_SD_DATA1_U,
.d2 = PERIPHS_IO_MUX_SD_DATA2_U,
.d3 = PERIPHS_IO_MUX_SD_DATA3_U,
+ .d3_gpio = 10,
.d4 = PERIPHS_IO_MUX_GPIO16_U,
.d5 = PERIPHS_IO_MUX_GPIO17_U,
.d6 = PERIPHS_IO_MUX_GPIO5_U,
@@ -72,6 +74,7 @@ static const sdmmc_slot_info_t s_slot_info[2] = {
.d1 = PERIPHS_IO_MUX_GPIO4_U,
.d2 = PERIPHS_IO_MUX_MTDI_U,
.d3 = PERIPHS_IO_MUX_MTCK_U,
+ .d3_gpio = 13,
.card_detect = HOST_CARD_DETECT_N_2_IDX,
.write_protect = HOST_CARD_WRITE_PRT_2_IDX,
.width = 4
@@ -328,10 +331,20 @@ esp_err_t sdmmc_host_init_slot(int slot, const sdmmc_slot_config_t* slot_config)
configure_pin(pslot->clk);
configure_pin(pslot->cmd);
configure_pin(pslot->d0);
+
if (slot_width >= 4) {
configure_pin(pslot->d1);
configure_pin(pslot->d2);
- configure_pin(pslot->d3);
+ //force pull-up D3 to make slave detect SD mode. connect to peripheral after width configuration.
+ gpio_config_t gpio_conf = {
+ .pin_bit_mask = BIT(pslot->d3_gpio),
+ .mode = GPIO_MODE_OUTPUT ,
+ .pull_up_en = 0,
+ .pull_down_en = 0,
+ .intr_type = GPIO_INTR_DISABLE,
+ };
+ gpio_config( &gpio_conf );
+ gpio_set_level( pslot->d3_gpio, 1 );
if (slot_width == 8) {
configure_pin(pslot->d4);
configure_pin(pslot->d5);
@@ -404,8 +417,10 @@ esp_err_t sdmmc_host_set_bus_width(int slot, size_t width)
} else if (width == 4) {
SDMMC.ctype.card_width_8 &= ~mask;
SDMMC.ctype.card_width |= mask;
+ configure_pin(s_slot_info[slot].d3); // D3 was set to GPIO high to force slave into SD 1-bit mode, until 4-bit mode is set
} else if (width == 8){
SDMMC.ctype.card_width_8 |= mask;
+ configure_pin(s_slot_info[slot].d3); // D3 was set to GPIO high to force slave into SD 1-bit mode, until 4-bit mode is set
} else {
return ESP_ERR_INVALID_ARG;
}
