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Possible ghosting fix for Cosmic

This commit is contained in:
Mike Bell 2023-04-26 21:30:04 +01:00 committed by Mike Bell
parent 89699fd78f
commit 5b31e018ff
2 changed files with 17 additions and 17 deletions
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19
libraries/cosmic_unicorn/cosmic_unicorn.cpp
View File

@ -31,10 +31,10 @@
// for each row:
// for each bcd frame:
// 0: 00111111 // row pixel count (minus one)
// 1 - 64: xxxxxbgr, xxxxxbgr, xxxxxbgr, ... // pixel data
// 65 - 67: xxxxxxxx, xxxxxxxx, xxxxxxxx // dummy bytes to dword align
// 68: xxxxrrrr // row select bits
// 69 - 71: tttttttt, tttttttt, tttttttt // bcd tick count (0-65536)
// 1: xxxxrrrr // row select bits
// 2 - 65: xxxxxbgr, xxxxxbgr, xxxxxbgr, ... // pixel data
// 66 - 67: xxxxxxxx, xxxxxxxx, // dummy bytes to dword align
// 68 - 71: tttttttt, tttttttt, tttttttt // bcd tick count (0-65536)
//
// .. and back to the start
@ -154,13 +154,14 @@ namespace pimoroni {
uint8_t *p = &bitstream[row * ROW_BYTES + (BCD_FRAME_BYTES * frame)];
p[ 0] = 64 - 1; // row pixel count
p[68] = row; // row select
p[ 1] = row; // row select
// set the number of bcd ticks for this frame
uint32_t bcd_ticks = (1 << frame);
p[69] = (bcd_ticks & 0xff) >> 0;
p[70] = (bcd_ticks & 0xff00) >> 8;
p[71] = (bcd_ticks & 0xff0000) >> 16;
p[68] = (bcd_ticks & 0xff) >> 0;
p[69] = (bcd_ticks & 0xff00) >> 8;
p[70] = (bcd_ticks & 0xff0000) >> 16;
p[71] = (bcd_ticks & 0xff000000) >> 24;
}
}
@ -491,7 +492,7 @@ namespace pimoroni {
// set the appropriate bits in the separate bcd frames
for(uint8_t frame = 0; frame < BCD_FRAME_COUNT; frame++) {
uint8_t *p = &bitstream[y * ROW_BYTES + (BCD_FRAME_BYTES * frame) + 1 + x];
uint8_t *p = &bitstream[y * ROW_BYTES + (BCD_FRAME_BYTES * frame) + 2 + x];
uint8_t red_bit = gamma_r & 0b1;
uint8_t green_bit = gamma_g & 0b1;

15
libraries/cosmic_unicorn/cosmic_unicorn.pio
View File

@ -21,10 +21,10 @@
; for each row:
; for each bcd frame:
; 0: 00111111 // row pixel count (minus one)
; 1 - 64: xxxxxbgr, xxxxxbgr, xxxxxbgr, ... // pixel data
; 65 - 67: xxxxxxxx, xxxxxxxx, xxxxxxxx // dummy bytes to dword align
; 68: xxxxrrrr // row select bits
; 69 - 71: tttttttt, tttttttt, tttttttt // bcd tick count (0-65536)
; 1: xxxxrrrr // row select bits
; 2 - 65: xxxxxbgr, xxxxxbgr, xxxxxbgr, ... // pixel data
; 66 - 67: xxxxxxxx, xxxxxxxx // dummy bytes to dword align
; 68 - 71: tttttttt, tttttttt, tttttttt // bcd tick count (0-65536)
;
; .. and back to the start
@ -33,6 +33,7 @@
; loop over row pixels
out y, 8 ; get row pixel count (minus 1 because test is pre decrement)
out pins, 8 ; output row select
pixels:
; red bit
@ -63,15 +64,13 @@ pixels:
jmp y-- pixels
out null, 24 ; discard dummy bytes
out pins, 8 ; output row select
out null, 16 ; discard dummy bytes
set pins, 0b110 [5] ; latch high, blank high
set pins, 0b000 ; blank low (enable output)
; loop over bcd delay period
out y, 24 ; get bcd delay counter value
out y, 32 ; get bcd delay counter value
bcd_delay:
jmp y-- bcd_delay