On Revison B boards the documentation (UM10940) states:
3.4
Boards from revision B onward include a FET placed in-line with the VDD connection to the SD/MMC card slot (see Section 4.7). Revision B and later boards have revision printed on the silkscreen on the underside of the board near the board name; revision A boards do not have the revision shown.
4.7
On revision B and later boards there is a FET placed in-line with the VDD connection to the SD/MMC card slot. This enables the power to this peripheral to be controlled using a GPIO connection from pin 1 of CN8 LPC GP Shield.
So it's very easy to enable VDD for the SD-Card slot:
Pin1 of CN8 is connected to P2_12 (GPIO1.12). We have to set this GPIO to low to enable VDD.
In the LPCOpen 3.02 samples we have to add in file lpc_board_nxp_lpcxpresso_4337\src\board.c a few lines of code in function Board_SDMMC_Init():
void Board_SDMMC_Init(void)
{
Chip_SCU_PinMuxSet(0x1, 9, SDIO_DAT_PINCFG); /* P1.9 connected to SDIO_D0 */
Chip_SCU_PinMuxSet(0x1, 10, SDIO_DAT_PINCFG); /* P1.10 connected to SDIO_D1 */
Chip_SCU_PinMuxSet(0x1, 11, SDIO_DAT_PINCFG); /* P1.11 connected to SDIO_D2 */
Chip_SCU_PinMuxSet(0x1, 12, SDIO_DAT_PINCFG); /* P1.12 connected to SDIO_D3 */
Chip_SCU_ClockPinMuxSet(2, (SCU_MODE_INACT | SCU_MODE_INBUFF_EN | SCU_MODE_FUNC4)); /* CLK2 connected to SDIO_CLK */
Chip_SCU_PinMuxSet(0x1, 6, SDIO_DAT_PINCFG); /* P1.6 connected to SDIO_CMD */
Chip_SCU_PinMuxSet(0x1, 13, (SCU_MODE_INBUFF_EN | SCU_MODE_FUNC7)); /* P1.13 connected to SDIO_CD */
/* Enable VDD for MMMC */
Chip_SCU_PinMuxSet(0x2, 12, (SCU_PINIO_FAST | SCU_MODE_FUNC0));
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 1, 12);
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 1, 12, (bool) false);
}
With this fix the sample was running without a wire between SD pin 4 and VDD.
Hi Omid Athari,
I found the OM13082 general purpose board didn't connect the SD card pin 4 to the VDD.
So, please add a wire between your OM13082 general purpose board SD card pin 4 to VDD, you also can check the SD card pin 4, whether it has 3.3V after you connect the board to your LPCXpresso LPC43S67 board.
Now, I modify my board, and test the lpcopen periph_sdmmc example which download from this link:
LPCOpen Software for LPC43XX|NXP
After insert a SD card, I can create the hello.txt successfully.
1. Solid a wire between SD pin 4 to 3.3V like this picture:
SD PIN4->CN7_12
2. Because in the lpcopen periph_sdmmc example , the code read the MESSAGE.TXT at first:
rc = f_open(&Fil, "MESSAGE.TXT", FA_READ);
you can create a MESSAGE.txt in your SD card before, the he code will read successfully.
3. These are the printf in the com from my side:
After running the code, you will find there has a HELLO.text file in the SD card.
Please follow my step, and do it again.
BTW, if in your own SD card design, for the stable working, I suggest you add the external 10K pull up in the SD card pin like the mini card circuit in the MCB4357 board:
Wish it helps you!
If you still have question, please let me know!
Have a great day,
Kerry
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