SD Card Logical Blocks

audim — Tue, 11 Mar 2025 13:05:02 GMT

I am working with...
MCUXpresso IDE v24.9 [Build 25][2024-09-26]
FreeRTOS Kernel V10.3.0
SDK 2.9.0
K64 processor

I have setup my SDHC something like this...

// global variables
static sd_card_t g_sdCard;
SDK_ALIGN(uint8_t g_dataBuf[DATA_BUFFER_SIZE], BOARD_SDMMC_DATA_BUFFER_ALIGN_SIZE);

// configure SD card descriptor, include card detect ISR
BOARD_SD_Config(&g_sdCard, isr_SDHC_CD, BOARD_SDMMC_SD_HOST_IRQ_PRIORITY, NULL);
SD_HostInit(&g_sdCard);
SD_SetCardPower(&g_sdCard, false);
SD_SetCardPower(&g_sdCard, true);
SD_CardInit(&g_sdCard);

To read block 0, I issue the following command...
SD_ReadBlocks(&g_sdCard, g_dataBuf, 0U, 1U);

Unfortunately, this is returning data from the physical block, not the logical block.

I don't care which physical block the Flash controller in the SD card is using to store my data.
When I say I need "block 0," I need the data in logical block 0.

How do I read logical blocks from an SD card?

Re: SD Card Logical Blocks

Habib_MS — Thu, 13 Mar 2025 22:56:16 GMT

Hello @audim,

I will ask internally if there is any recommendation for using logic blocks. However, this API is propably not currently implemented. In that case, the application will implement itself.

BR
Habib

MCUXpresso SDK中的主题 SD Card Logical Blocks

SD Card Logical Blocks

Re: SD Card Logical Blocks