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align bitstream for 32bit dma transfer and fix ghosting issue (#13) 

Co-authored-by: Jonathan Williamson <jon@pimoroni.com>
pull/22/head v0.0.3
Philip Howard 2021-01-24 14:58:48 +00:00 zatwierdzone przez GitHub
rodzic daac2c64d5
commit 356a8857c7
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1 zmienionych plików z 7 dodań i 2 usunięć
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libraries/pico_unicorn/pico_unicorn.cpp
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@ -50,7 +50,8 @@ constexpr uint32_t ROW_BYTES = 12;
constexpr uint32_t BCD_FRAMES = 15; // includes fet discharge frame constexpr uint32_t BCD_FRAMES = 15; // includes fet discharge frame
constexpr uint32_t BITSTREAM_LENGTH = (ROW_COUNT * ROW_BYTES * BCD_FRAMES); constexpr uint32_t BITSTREAM_LENGTH = (ROW_COUNT * ROW_BYTES * BCD_FRAMES);
uint8_t bitstream[BITSTREAM_LENGTH] = {0}; // must be aligned for 32bit dma transfer
alignas(4) uint8_t bitstream[BITSTREAM_LENGTH] = {0};
uint16_t r_gamma_lut[256] = {0}; uint16_t r_gamma_lut[256] = {0};
uint16_t g_gamma_lut[256] = {0}; uint16_t g_gamma_lut[256] = {0};
@ -165,11 +166,15 @@ namespace pimoroni {
// the last bcd frame is used to allow the fets to discharge to avoid ghosting // the last bcd frame is used to allow the fets to discharge to avoid ghosting
if(frame == BCD_FRAMES - 1) { if(frame == BCD_FRAMES - 1) {
bitstream[row_select_offset] = 0b01111111; bitstream[row_select_offset] = 0b11111111;
uint16_t bcd_ticks = 65535; uint16_t bcd_ticks = 65535;
bitstream[bcd_offset + 1] = (bcd_ticks & 0xff00) >> 8; bitstream[bcd_offset + 1] = (bcd_ticks & 0xff00) >> 8;
bitstream[bcd_offset] = (bcd_ticks & 0xff); bitstream[bcd_offset] = (bcd_ticks & 0xff);
for(uint8_t col = 0; col < 6; col++) {
bitstream[offset + col] = 0xff;
}
}else{ }else{
uint8_t row_select_mask = ~(1 << (7 - row)); uint8_t row_select_mask = ~(1 << (7 - row));
bitstream[row_select_offset] = row_select_mask; bitstream[row_select_offset] = row_select_mask;