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TM4C129 EPI ALE

Victor L-S
Intellectual 925 points

Hello,

I've been using this code to configure the EPI with EPIS030 as ALE strobe high. My signal capture shows it as strobe low. 


MAP_EPIModeSet(EPI0_BASE, EPI_MODE_HB8);

MAP_EPIDividerSet(EPI0_BASE, 0x1);

MAP_EPIAddressMapSet(EPI0_BASE, (EPI_FLASH_SIZE | EPI_ADDR_RAM_BASE));

MAP_EPIConfigHB8Set(EPI0_BASE, EPI_HB8_MODE_ADMUX, EPI_HB8_ALE_HIGH);

Might someone tell me what I am missing.

Thank you,

Victor

  • 0
    TI__Guru**** 244440 points
    Hello Victor

    And when you make the parameter as EPI_HB8_ALE_LOW, then does it strobe high?

    Please provide the snapshot of the register window in CCS for EPI.
  • 0 in reply to Amit Ashara
    Intellectual 925 points
    Hello Amit,

    Thanks for the insight on the EPI register dump.

    Here are the before and after dumps for

    MAP_EPIConfigHB8Set(EPI0_BASE, EPI_HB8_MODE_ADMUX, (EPI_HB8_RDWAIT_0 | EPI_HB8_ALE_HIGH));

    EPI0 External Peripheral Interface register offsets
    EPI_CFG 0x00000012 EPI Configuration [Memory Mapped]
    EPI_BAUD 0x00000001 EPI Main Baud Rate [Memory Mapped]
    EPI_BAUD2 0x00000000 EPI Main Baud Rate [Memory Mapped]
    EPI_HB16CFG 0x0008FF00 EPI Host-Bus 16 Configuration [Memory Mapped]
    EPI_GPCFG 0x0008FF00 EPI General-Purpose Configuration [Memory Mapped]
    EPI_SDRAMCFG 0x0008FF00 EPI SDRAM Configuration [Memory Mapped]
    EPI_HB8CFG 0x0008FF00 EPI Host-Bus 8 Configuration [Memory Mapped]
    EPI_HB8CFG2 0x00080000 EPI Host-Bus 8 Configuration 2 [Memory Mapped]
    EPI_HB16CFG2 0x00080000 EPI Host-Bus 16 Configuration 2 [Memory Mapped]

    EPI0 External Peripheral Interface register offsets
    EPI_CFG 0x00000012 EPI Configuration [Memory Mapped]
    EPI_BAUD 0x00000001 EPI Main Baud Rate [Memory Mapped]
    EPI_BAUD2 0x00000000 EPI Main Baud Rate [Memory Mapped]
    EPI_HB16CFG 0x08000000 EPI Host-Bus 16 Configuration [Memory Mapped]
    EPI_GPCFG 0x08000000 EPI General-Purpose Configuration [Memory Mapped]
    EPI_SDRAMCFG 0x08000000 EPI SDRAM Configuration [Memory Mapped]
    EPI_HB8CFG 0x08000000 EPI Host-Bus 8 Configuration [Memory Mapped]
    EPI_HB8CFG2 0x00000000 EPI Host-Bus 8 Configuration 2 [Memory Mapped]
    EPI_HB16CFG2 0x00000000 EPI Host-Bus 16 Configuration 2 [Memory Mapped]
    EPI_ADDRMAP 0x0000000D EPI Address Map [Memory Mapped]

    The default Host8 seems to be working for me so I'll go with that for now and not use MAP_EPIConfigHB8Set. Let me know if you need anything more from me.

    Thanks,

    Victor
  • 0 in reply to Victor L-S
    TI__Guru**** 244440 points
    Hello Victor

    And can you show a signal capture? I checked one of my older code

    EPIModeSet(EPI0_BASE, EPI_MODE_HB8);

    EPIDividerSet(EPI0_BASE, 0x1);

    EPIConfigHB8CSSet(EPI0_BASE, 0, (EPI_HB8_CSCFG_ALE_SINGLE_CS | EPI_HB8_ALE_HIGH | EPI_HB8_WRWAIT_0 |
    EPI_HB8));

    And this works...