Hi,
I am currently trying to add SD card and FatFS functionality to an existing project however I am having some difficulty getting the SD card to initialize correctly. My code is based off the SDK example for using FreeRTOS, FatFS, and SDMMC.
When trying to initialize the SD card using SD_CardInit the project will get stuck waiting when trying to read the SCR from the SD card. Specifically it gets stuck while executing the SDMMCHOST_TransferFunction during the data transfer event, see screenshot attached. Upon executing the SDMMC_OSA_EventWait (as shown in screenshot) FreeRTOS will proceed to return to an idle task and remain there until the program is stopped.
Any ideas on how to resolve this issue?
Thanks,
Jon McLean
Code Screenshot:
Debug Thread Screenshot:
FreeRTOS Task Screenshot:
Card Detect Task Code:
static void CardDetectTask(void *pvParameters) {
cardDetectSemaphore = xSemaphoreCreateBinary();
BOARD_SD_Config(&g_sd, SDCARD_DetectCallback, BOARD_SDMMC_SD_HOST_IRQ_PRIORITY, NULL);
if(SD_HostInit(&g_sd) == kStatus_Success) {
while(true) {
if(xSemaphoreTake(cardDetectSemaphore, portMAX_DELAY) == pdTRUE) {
if(cardInserted != cardInsertedStatus) {
cardInserted = cardInsertedStatus;
if(cardInserted) {
PRINTF("Card Inserted\r\n");
SD_SetCardPower(&g_sd, false);
SD_SetCardPower(&g_sd, true);
PRINTF("\r\n\Initialising SD Card \r\n");
SD_CardInit(&g_sd);
PRINTF("\r\nFinished Card Init\r\n");
if(DEMO_MakeFileSystem() != kStatus_Success) {
continue;
}
// Notify Tasks
}
}
if(!cardInserted) {
PRINTF("\r\n No SD card, please insert \r\n");
}
}
}
}else {
PRINTF("\r\nSD Host Init Failed\r\n");
}
vTaskSuspend(NULL);
}
Hi @Omar_Anguiano ,
Thanks for the response. This issue occurs across all SD cards I have available (all SDHC). I am not using an EVK board and am instead using a custom development board. I am using SDK version 2.12.1.
Also I have done some further investigation since my last post and have managed to use a logic analyzer to get the following output which shows the SCR is sent and a response is given by the card (which as far as I can tell is then ignored by the host, hence causing the program to hang).
Additionally I have contacted the manufacturer of the board I am using to confirm the pin configurations are correct. I've attached the full output from the logic analyzer below (produced using pulseview). Let me know if you have any ideas as to what could be causing this.
Thanks,
Jon McLean
EDIT: I've also attached a better screenshot of the logic analyzer that contains the channel names for each of the traces
