topic Does SD card interface work on 208 pin LPC54608? in LPC Microcontrollers

Does SD card interface work on 208 pin LPC54608?

padraig_fogarty — Tue, 08 Jan 2019 18:03:08 GMT

I'm trying to get the SD card interface working on an LPC54608 208 pin part. I'm aware of the errata regarding SD card interface 4-bit mode, and I have configured my device pins accordingly (as shown below).

However, the when I run the 'lpcxpresso54608_sdcard_polling' demo software on my target, it fails if I include the code which sets 4-bit mode; without 4-bit mode the SD card can be accessed correctly.

The same demo code work on my lpcxpresso demo hardware (180 pin device) so the code seems to be fine, which leaves me wondering if there is something extra that I need to do to get this to work on the 208 pin part?

// PIN CONFIGURATION DATA

/* clang-format off */
/*
* TEXT BELOW IS USED AS SETTING FOR TOOLS *************************************
BOARD_InitPins_SDCARD:
- options: {callFromInitBoot: 'true', prefix: BOARD_, coreID: core0, enableClock: 'true'}
- pin_list:
- {pin_num: '9', peripheral: SDIF, signal: SD_CMD, pin_signal: PIO2_4/ENET_TXD3/SD_CMD/FC1_TXD_SCL_MISO/CTIMER2_MAT1, mode: inactive, slew_rate: fast}
- {pin_num: '12', peripheral: SDIF, signal: SD_POW_EN, pin_signal: PIO2_5/ENET_TX_ER/SD_POW_EN/FC1_CTS_SDA_SSEL0/CTIMER1_MAT2, mode: inactive}
- {pin_num: '7', peripheral: SDIF, signal: SD_CLK, pin_signal: PIO2_3/ENET_TXD2/SD_CLK/FC1_RXD_SDA_MOSI/CTIMER2_MAT0, mode: inactive, slew_rate: fast}
- {pin_num: '17', peripheral: SDIF, signal: 'SD_D, 0', pin_signal: PIO2_6/ENET_TX_CLK/SD_D(0)/FC1_RTS_SCL_SSEL1/CTIMER0_CAP0, mode: inactive, slew_rate: fast}
- {pin_num: '29', peripheral: SDIF, signal: 'SD_D, 1', pin_signal: PIO2_7/ENET_COL/SD_D(1)/FREQME_GPIO_CLK_B/CTIMER0_CAP1, mode: inactive, slew_rate: fast}
- {pin_num: '32', peripheral: SDIF, signal: 'SD_D, 2', pin_signal: PIO2_8/ENET_RXD2/SD_D(2)/CTIMER0_MAT0, mode: inactive, slew_rate: fast}
- {pin_num: '36', peripheral: SDIF, signal: 'SD_D, 3', pin_signal: PIO2_9/ENET_RXD3/SD_D(3)/CTIMER0_MAT1, mode: inactive, slew_rate: fast}
- {pin_num: '39', peripheral: SDIF, signal: SD_CARD_DET, pin_signal: PIO2_10/ENET_RX_ER/SD_CARD_DET_N}
- {pin_num: '80', peripheral: SDIF, signal: 'SD_D, 5', pin_signal: PIO4_30/ENET_TX_CLK/SD_D(5)/CTIMER3_MAT0/FC1_RTS_SCL_SSEL1/CTIMER1_CAP3/EMC_D(25), slew_rate: fast}
- {pin_num: '68', peripheral: SDIF, signal: 'SD_D, 6', pin_signal: PIO3_18/FC8_CTS_SDA_SSEL0/SD_D(6)/CTIMER4_MAT0/CAN0_TD/SCT0_OUT5, slew_rate: fast}
- {pin_num: '44', peripheral: SDIF, signal: 'SD_D, 7', pin_signal: PIO3_19/FC8_RTS_SCL_SSEL1/SD_D(7)/CTIMER4_MAT1/CAN0_RD/SCT0_OUT6, slew_rate: fast}
- {pin_num: '19', peripheral: SDIF, signal: 'SD_D, 4', pin_signal: PIO3_16/FC8_RXD_SDA_MOSI/SD_D(4), slew_rate: fast}
- {pin_num: '46', peripheral: SDIF, signal: SD_CARD_INT, pin_signal: PIO3_20/FC9_SCK/SD_CARD_INT_N/CLKOUT/SCT0_OUT7}
- {pin_num: '11', peripheral: SDIF, signal: SD_WR_PRT, pin_signal: PIO3_15/FC8_SCK/SD_WR_PRT, identifier: '', mode: pullDown}
* BE CAREFUL MODIFYING THIS COMMENT - IT IS YAML SETTINGS FOR TOOLS ***********
*/
/* clang-format on */

Re: Does SD card interface work on 208 pin LPC54608?

soledad — Tue, 15 Jan 2019 04:35:45 GMT

Hi,

Please check the following thread,

SDIO Errata + SDRAM on LPCXPRESSO 54608 Notice

Have a great day,

Sol

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Re: Does SD card interface work on 208 pin LPC54608?

soledad — Tue, 15 Jan 2019 04:38:58 GMT

Hi,

Please check the following thread,

SDIO Errata + SDRAM on LPCXPRESSO 54608 Notice

Have a great day,

Sol

Re: Does SD card interface work on 208 pin LPC54608?

padraig_fogarty — Tue, 15 Jan 2019 09:39:14 GMT

I'm aware of the errata and the link you provided, however my configuration for the SD card does not use the SDRAM pins. I've also created a basic project which does not include any SDRAM module but the results are the same.

Does the errata require the unused pins (D[4:7]) to all be at a logic high level?

Because our design has external pull-down resistors on some of the SDIO pins (D[4:7]).

Re: Does SD card interface work on 208 pin LPC54608?

soledad — Wed, 16 Jan 2019 19:32:35 GMT

You don't need to connect the pins externally, but it is necessary to program the IOCON registers to select the SD_[D4] to SD_D[7] functions and to enable the on-chip pull-up resistors onto 4 unused GPIO pins.

Have a great day,

Sol

Re: Does SD card interface work on 208 pin LPC54608?

padraig_fogarty — Fri, 18 Jan 2019 11:16:35 GMT

I finally managed to resolve this problem by lifting the four I/O pins routed to SD_[D7:D4] from the PCB.

So for others, it might be worth clarifying that not only do these the four extra pins have to be assigned to SD, and configured with pull-ups, but any external load on these pins will most likely to make the interface inoperable.

regards

Padraig