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OMAP-L138 Using MMC/SD1 in 4 bit mode along with the LCD

Haroldo
Intellectual 590 points

Hi,

  I´m designing a custom board for the OMAP-138 and have a few doubts regarding the possible muxing options for peripherals.

I was wondering if it is possible to use the MMC/SD1 in 4 bit mode and the LCD peripheral simultaneously ?

 Also when using UART1 can I use the RTS and CTS signals as GPIO if I dont need flow control?

 

Any help on this regard is highly appreciated.

 

  • 0 in reply to Gus Martinez
    Intellectual 590 points

    Hi Gus,

     Yes I have, The thing is if two peripherals share common pins it prompts an alarm but still leaves the pins selected.

    I just want to be sure that the is no problem with the selections I have made, that there are no conflicts between the SD1 and the LCD

    I´m attaching the .PIN file of my configuration for reference (The file extension is .txt you should change it to .pin in order to open it in theconfig utility)

    Fullscreen 3782.nelesys2.txt.txt Download 
    PRU0_R30[20]
PRU0_R30[19]
PRU0_R31[20]
PRU0_R31[19]
PRU0_R30[18]
USB_REFCLKIN
UART2_RTS
UART2_CTS
ECAP2_APWM2
GP0[6]
GP0[5]
GP0[4]
GP0[3]
GP0[2]
GP0[1]
ECAP1_APWM1
GP1[15]
MII_TXEN
MII_TXCLK
MII_COL
MII_TXD[3]
MII_TXD[2]
MII_TXD[1]
MII_TXD[0]
MII_RXCLK
MII_RXDV
MII_RXER
MII_CRS
MII_RXD[3]
MII_RXD[2]
MII_RXD[1]
MII_RXD[0]
MDIO_CLK
MDIO_D
I2C0_SCL
I2C0_SDA
UART2_RXD
UART2_TXD
UART1_RXD
UART1_TXD
SPI1_SCS[1]
SPI1_SCS[0]
SPI1_CLK
SPI1_ENA
SPI1_SOMI
SPI1_SIMO
GP2[9]
GP2[8]
GP2[7]
GP2[6]
GP2[5]
GP2[4]
GP2[3]
GP2[2]
GP2[1]
GP2[0]
GP3[15]
EMA_CS[3]
EMA_CS[4]
GP3[12]
EMA_WE
EMA_OE
GP3[9]
EMA_WAIT[0]
GP3[7]
GP3[6]
GP3[5]
GP3[4]
GP3[3]
GP3[2]
GP3[1]
GP3[0]
EMA_D[7]
EMA_D[6]
EMA_D[5]
EMA_D[4]
EMA_D[3]
EMA_D[2]
EMA_D[1]
EMA_D[0]
MMCSD0_CLK
MMCSD0_CMD
MMCSD0_DAT[0]
MMCSD0_DAT[1]
MMCSD0_DAT[2]
MMCSD0_DAT[3]
MMCSD0_DAT[4]
MMCSD0_DAT[5]
MMCSD0_DAT[6]
MMCSD0_DAT[7]
GP5[13]
GP5[12]
GP5[11]
GP5[10]
GP5[9]
GP5[8]
GP5[7]
GP5[6]
GP5[5]
GP5[4]
GP5[3]
EMA_A[2]
EMA_A[1]
GP5[0]
RESETOUT
OBSCLK0
GP6[13]
GP6[12]
UPP_CH1_CLK
UPP_CH1_START
UPP_CH1_ENABLE
UPP_CH1_WAIT
UPP_2xTXCLK
PRU1_R30[9]
UPP_D15
UPP_D14
UPP_D13
UPP_D12
UPP_D11
UPP_D10
UPP_D9
UPP_D8
UPP_D7
UPP_D6
UPP_D5
UPP_D4
UPP_D3
UPP_D2
UPP_D1
UPP_D0
LCD_D[7]
LCD_D[6]
LCD_D[5]
LCD_D[4]
LCD_D[3]
LCD_D[2]
LCD_D[1]
LCD_D[0]
LCD_D[15]
LCD_D[14]
LCD_D[13]
LCD_D[12]
LCD_D[11]
LCD_D[10]
LCD_D[9]
LCD_D[8]
MMCSD1_DAT[0]
MMCSD1_CLK
MMCSD1_CMD
PRU1_R31[24]
LCD_PCLK
LCD_MCLK
LCD_HSYNC
LCD_VSYNC
MMCSD1_DAT[3]
MMCSD1_DAT[2]
MMCSD1_DAT[1]
PRU1_R31[1]
LCD_AC_ENB_CS
RTCK
    , if you could take a look I would appreciate it.

    The peripherals I`m using are:

     

    -EMIFA for 8 bit NAND FLASH

    -UART2 with flow control, UART 1 witout flow control

    -SP1 with 2 chip selects (0,1)

    -LCD

    -MMC/SD0 8 bit mode, MMC/SD1 4 bit mode

    -I2C0

    -uPP with one 16 bit channel only (CH1)

    -MII  and MDIO for ethernet

    -3 PRU1 pins,5 PRU0 pins

    -eCAP1 and eCAP2

    -41 GPIO pins

     

    Thank You

     

     

     

     

  • 0
    TI__Mastermind 29141 points

    Haroldo said:

    I was wondering if it is possible to use the MMC/SD1 in 4 bit mode and the LCD peripheral simultaneously ?

    Yes, this is definitely possible.  Only the MMCSD1_DAT[7:4] pins are muxed with the LCD; in 4-bit mode, these pins are not used for MMC/SD operation.

    Haroldo said:
    Also when using UART1 can I use the RTS and CTS signals as GPIO if I dont need flow control?

    Yes.

  • 0 in reply to Gus Martinez
    Intellectual 590 points

    Hi Gus,

     

     Thanks for the support and the quick response!