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sdmmc: Add width field to the slot config.

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Therefore if the width is set to 1, you can choose to only
configure the CLK, DAT0 and CMD pins.

Merges #361 https://github.com/espressif/esp-idf/pull/361
This commit is contained in:
Daniel Campora 2017-02-20 00:42:58 +00:00 committed by Angus Gratton
parent de461671aa
commit 82ef2b9485
2 changed files with 17 additions and 8 deletions
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2
components/driver/include/driver/sdmmc_host.h
View File

@ -50,6 +50,7 @@ extern "C" {
typedef struct {
gpio_num_t gpio_cd; ///< GPIO number of card detect signal
gpio_num_t gpio_wp; ///< GPIO number of write protect signal
uint8_t width; ///< Bus width used by the slot (might be less than the max width supported)
} sdmmc_slot_config_t;
#define SDMMC_SLOT_NO_CD ((gpio_num_t) -1) ///< indicates that card detect line is not used
@ -61,6 +62,7 @@ typedef struct {
#define SDMMC_SLOT_CONFIG_DEFAULT() {\
.gpio_cd = SDMMC_SLOT_NO_CD, \
.gpio_wp = SDMMC_SLOT_NO_WP, \
.width = 4, \
}
/**

23
components/driver/sdmmc_host.c
View File

@ -302,17 +302,24 @@ esp_err_t sdmmc_host_init_slot(int slot, const sdmmc_slot_config_t* slot_config)
// Configure pins
const sdmmc_slot_info_t* pslot = &s_slot_info[slot];
if (slot_config->width > pslot->width) {
return ESP_ERR_INVALID_ARG;
}
configure_pin(pslot->clk);
configure_pin(pslot->cmd);
configure_pin(pslot->d0);
configure_pin(pslot->d1);
configure_pin(pslot->d2);
configure_pin(pslot->d3);
if (pslot->width == 8) {
configure_pin(pslot->d4);
configure_pin(pslot->d5);
configure_pin(pslot->d6);
configure_pin(pslot->d7);
if (slot_config->width >= 4) {
configure_pin(pslot->d1);
configure_pin(pslot->d2);
configure_pin(pslot->d3);
if (slot_config->width == 8) {
configure_pin(pslot->d4);
configure_pin(pslot->d5);
configure_pin(pslot->d6);
configure_pin(pslot->d7);
}
}
if (gpio_cd != -1) {
gpio_set_direction(gpio_cd, GPIO_MODE_INPUT);