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Spike fixes #13

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Merged
merged 7 commits into from
Nov 28, 2025
Merged

Spike fixes #13

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dc90f8c
more accurate autodetect
PastorL69 Nov 27, 2025
684a507
Seperate entry for sega & data east
PastorL69 Nov 27, 2025
366ea52
swap de and sega entry
PastorL69 Nov 27, 2025
ab908b7
as per daniel's original pio file, rdata is used for jump control
PastorL69 Nov 27, 2025
4760774
typo
PastorL69 Nov 27, 2025
de83eeb
data east more robust
PastorL69 Nov 28, 2025
9a78d28
sega too
PastorL69 Nov 28, 2025
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29 changes: 22 additions & 7 deletions src/dmd_reader.c
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Original file line number Diff line number Diff line change
Expand Up @@ -336,34 +336,49 @@ int detect_dmd() {
uint32_t de = count_clock(&dmd_count_de_program);
uint32_t rdata = count_clock(&dmd_count_rdata_program);

// By checking DOTCLK, DE and RDATA we can identify system types
// All values are based on a 500ms sample of data, multiplied by 2

printf("", dotclk, de, rdata);

// WPC: DOTCLK: 500000 | DE: 3900 | RDATA: 120
if ((dotclk > 450000) && (dotclk < 550000) && (de > 3800) && (de < 4000) &&
(rdata > 115) && (rdata < 130)) {
printf("WPC detected\n");
spi_notify_onoff(DMD_WPC);
return DMD_WPC;

} else if ((dotclk > 630000) && (dotclk < 650000) && (de > 4900) &&
(de < 5100) && (rdata > 75) && (rdata < 2600)) {
printf("Data East/Sega detected\n");
// Data East: DOTCLK: 640000 | DE: 5000 | RDATA: 80
} else if ((dotclk > 630000) && (dotclk < 650000) && (de > 4930) &&
(de < 5070) && (rdata > 75) && (rdata < 85)) {
printf("Data East detected\n");
spi_notify_onoff(DMD_DESEGA);
return DMD_DESEGA;

// SEGA: DOTCLK: 640000 | DE: 5000 | RDATA: 2580
} else if ((dotclk > 630000) && (dotclk < 650000) && (de > 4930) &&
(de < 5070) && (rdata > 2530) && (rdata < 2630)) {
printf("Sega detected\n");
spi_notify_onoff(DMD_DESEGA);
return DMD_DESEGA;

} else if ((dotclk > 645000) && (dotclk < 665000) && (de > 5075) &&
// Whitestar -> DOTCLK: 657000 | DE: 5140 | RDATA: 80
} else if ((dotclk > 645000) && (dotclk < 669000) && (de > 5075) &&
(de < 5200) && (rdata > 75) && (rdata < 85)) {
printf("Stern Whitestar detected\n");
spi_notify_onoff(DMD_WHITESTAR);
return DMD_WHITESTAR;

// SPIKE1 -> unknown for now
} else if ((dotclk > 1000000) && (dotclk < 1100000) && (de > 8000) &&
(de < 8400) && (rdata > 240) && (rdata < 270)) {
printf("Stern Spike1 detected\n");
spi_notify_onoff(DMD_SPIKE1);
return DMD_SPIKE1;

} else if ((dotclk > 1000000) && (dotclk < 1100000) && (de > 8000) &&
(de < 8400) && (rdata > 60) && (rdata < 70)) {
// SAM -> DOTCLK: 1025000 | DE: 8000 | RDATA: 60
} else if ((dotclk > 1000000) && (dotclk < 1050000) && (de > 7900) &&
(de < 8100) && (rdata > 55) && (rdata < 65)) {
printf("Stern SAM detected\n");
spi_notify_onoff(DMD_SAM);
return DMD_SAM;
Expand Down Expand Up @@ -614,7 +629,7 @@ bool init() {
pio_sm_config frame_config =
dmd_framedetect_spike_program_get_default_config(offset);
dmd_framedetect_program_init(frame_pio, frame_sm, offset, frame_config,
input_pins, 2, 0);
input_pins, 2, RDATA);
pio_sm_set_enabled(frame_pio, frame_sm, true);
printf("Spike frame detection initialized\n");

Expand Down