Sorry if this is a duplicate. My original post was apparently not successful.
We have a TM4C129 connected to an FPGA with separate address+data. Loading the FPGA doesn't work in GP mode because EPI_WR is is the wrong polarity. Switching to HB16 mode so EPI_WR to clocks data out on the rising edge at the end of the write cycle doesn't drive any EPI signals at all.
This works:
EPIModeSet(EPI0_BASE, EPI_MODE_GENERAL);
EPIConfigGPModeSet( EPI0_BASE, // ui32Base
EPI_GPMODE_CLKPIN | EPI_GPMODE_ASIZE_12 | EPI_GPMODE_DSIZE_16, // ui32Config
0, // ui32FrameCount
0);// ui32MaxWait
EPIAddressMapSet(EPI0_BASE, EPI_ADDR_PER_BASE_A | EPI_ADDR_PER_SIZE_64KB);// BASE_A->0xa0000000
This does not:
EPIModeSet(EPI0_BASE, EPI_MODE_HB16);
EPIConfigHB16Set( EPI0_BASE, // ui32Base
EPI_HB16_MODE_ADDEMUX | EPI_HB16_CSCFG_CS, // ui32Config
0xff);// ui32MaxWait
EPIAddressMapSet(EPI0_BASE, EPI_ADDR_PER_BASE_A | EPI_ADDR_PER_SIZE_64KB);// BASE_A->0xa0000000
What am I doing wrong for HB16 mode? Thanks.
