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final calculations

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This commit is contained in:
Lukaswnd 2024-06-10 23:08:00 +02:00
parent 249325d532
commit 0829a284bd
1 changed files with 11 additions and 7 deletions
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18
src/platforms/esp32c6/dma_parallel_io.cpp
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@ -38,15 +38,19 @@
// limitation of parlio interface
// PARLIO_LL_TX_MAX_BITS_PER_FRAME = (PARLIO_LL_TX_MAX_BYTES_PER_FRAME * 8)
// PARLIO_LL_TX_MAX_BYTES_PER_FRAME = 0xFFFF
// the problem are not these 2 defines. In "soc/parl_io_struct.h" (esp32-arduino-libs\esp32c6\include\soc\esp32c6\include\soc\parl_io_struct.h)
// there are only 16 bit for the number of bytes. I'm not sure, but I think this is the limiting factor. And I think
// this struct links to registers for die parlio driver, so no software change possible -> maybe software change?
// Max of 65535 bytes for matrix with 2 scan lines the following resulutions are theoretical max for pixeldepths
// theory tested
// pixeldepth 8: 16x16 14x32
// pixeldepth 7: 16x32 32x16 28x32
// pixeldepth 6: 32x32 64x16 55x32
// pixeldepth 5: 32x64 64x32 128x16 102x32
// pixeldepth 4: 64x64 128x32 256x16 186x32
// pixeldepth 3: 128x64 256x32 512x16 341x32
// pixeldepth 2: 128x128 256x64 512x32 1024x16 682x32
// pixeldepth 8: 16x16 14x32 14*16*255 = 57120
// pixeldepth 7: 16x32 32x16 28x32 28*16*127 = 56896
// pixeldepth 6: 32x32 64x16 55x32 55*16*63 = 55440
// pixeldepth 5: 32x64 64x32 128x16 102x32 102*16*31 = 50592
// pixeldepth 4: 64x64 128x32 256x16 186x32 186*16*15 = 44640
// pixeldepth 3: 128x64 256x32 512x16 341x32 341*16*7 = 38192
// pixeldepth 2: 128x128 256x64 512x32 1024x16 682x32 682*16*2 = 32736
// I don't get it