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core: use set_clr_card_detect to disable SD card pull-up resistor

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This commit is contained in:
Pavol Rusnak 2019-09-24 19:04:25 +00:00
parent 6c14ee7ec0
commit dcff4ade01
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GPG Key ID: 91F3B339B9A02A3D
2 changed files with 73 additions and 0 deletions
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61
core/embed/trezorhal/sdcard-set_clr_card_detect.h Normal file
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@ -0,0 +1,61 @@
#include "stm32f4xx_ll_sdmmc.h"
// this function is adapted from stm32f4xx_ll_sdmmc.c
static uint32_t SDMMC_GetCmdResp1(SDIO_TypeDef *SDIOx, uint8_t SD_CMD,
uint32_t Timeout) {
/* 8 is the number of required instructions cycles for the below loop
statement. The Timeout is expressed in ms */
register uint32_t count = Timeout * (SystemCoreClock / 8U / 1000U);
do {
if (count-- == 0U) {
return SDMMC_ERROR_TIMEOUT;
}
} while (!__SDIO_GET_FLAG(
SDIOx, SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CMDREND | SDIO_FLAG_CTIMEOUT));
if (__SDIO_GET_FLAG(SDIOx, SDIO_FLAG_CTIMEOUT)) {
__SDIO_CLEAR_FLAG(SDIOx, SDIO_FLAG_CTIMEOUT);
return SDMMC_ERROR_CMD_RSP_TIMEOUT;
} else if (__SDIO_GET_FLAG(SDIOx, SDIO_FLAG_CCRCFAIL)) {
__SDIO_CLEAR_FLAG(SDIOx, SDIO_FLAG_CCRCFAIL);
return SDMMC_ERROR_CMD_CRC_FAIL;
}
/* Check response received is of desired command */
if (SDIO_GetCommandResponse(SDIOx) != SD_CMD) {
return SDMMC_ERROR_CMD_CRC_FAIL;
}
/* Clear all the static flags */
__SDIO_CLEAR_FLAG(SDIOx, SDIO_STATIC_FLAGS);
/* We have received response, retrieve it for analysis */
uint32_t response_r1 = SDIO_GetResponse(SDIOx, SDIO_RESP1);
if ((response_r1 & SDMMC_OCR_ERRORBITS) == SDMMC_ALLZERO) {
return SDMMC_ERROR_NONE;
} else {
return SDMMC_ERROR_GENERAL_UNKNOWN_ERR;
}
}
// this function is inspired by functions in stm32f4xx_ll_sdmmc.c
uint32_t SDMMC_CmdSetClrCardDetect(SDIO_TypeDef *SDIOx, uint32_t Argument) {
SDIO_CmdInitTypeDef sdmmc_cmdinit;
uint32_t errorstate = SDMMC_ERROR_NONE;
sdmmc_cmdinit.Argument = (uint32_t)Argument;
sdmmc_cmdinit.CmdIndex = SDMMC_CMD_SD_APP_SET_CLR_CARD_DETECT;
sdmmc_cmdinit.Response = SDIO_RESPONSE_SHORT;
sdmmc_cmdinit.WaitForInterrupt = SDIO_WAIT_NO;
sdmmc_cmdinit.CPSM = SDIO_CPSM_ENABLE;
SDIO_SendCommand(SDIOx, &sdmmc_cmdinit);
errorstate = SDMMC_GetCmdResp1(SDIOx, SDMMC_CMD_SD_APP_SET_CLR_CARD_DETECT,
SDIO_CMDTIMEOUT);
return errorstate;
}

12
core/embed/trezorhal/sdcard.c
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@ -47,6 +47,7 @@
#include <string.h>
#include "sdcard-set_clr_card_detect.h"
#include "sdcard.h"
static SD_HandleTypeDef sd_handle;
@ -143,6 +144,17 @@ secbool sdcard_power_on(void) {
HAL_Delay(50);
}
// disable the card's internal CD/DAT3 card detect pull-up resistor
// to send ACMD42, we have to send CMD55 (APP_CMD) with with the card's RCA as
// the argument followed by CMD42 (SET_CLR_CARD_DETECT)
if (SDMMC_CmdAppCommand(sd_handle.Instance, sd_handle.SdCard.RelCardAdd
<< 16U) != SDMMC_ERROR_NONE) {
goto error;
}
if (SDMMC_CmdSetClrCardDetect(sd_handle.Instance, 0) != SDMMC_ERROR_NONE) {
goto error;
}
// configure the SD bus width for wide operation
if (HAL_SD_ConfigWideBusOperation(&sd_handle, SDIO_BUS_WIDE_4B) != HAL_OK) {
HAL_SD_DeInit(&sd_handle);