ash/loopy_midi_controller
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Make flash latency tunable at runtime via 'latency N' serial command

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ash
2026-07-03 07:57:31 +00:00
parent df1f678845
commit 907279e1ea
1 changed files with 15 additions and 2 deletions
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src/main.cpp
+15 -2
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@@ -21,6 +21,8 @@ UsbMidiTransport midi_transport;
AppTask controller(&led_driver, &switch_driver, &midi_transport);
ExpressionPedal exp_pedal(4);
static volatile uint32_t flash_latency = 20; // ms delay to compensate for Loopy Pro rendering
TaskHandle_t midi_task_handle = NULL;
void midi_task(void* parameter) {
@@ -29,7 +31,6 @@ void midi_task(void* parameter) {
// Beat timing fixes for precise beat alignment - sync to real MIDI time, not hardcoded tempo
uint32_t last_beat = 0;
uint32_t flash_start = 0;
const uint32_t FLASH_LATENCY = 20; // ms delay to compensate for audio buffer
while (true) {
midi_transport.update();
@@ -42,7 +43,7 @@ void midi_task(void* parameter) {
if (current_beat != last_beat) {
last_beat = current_beat;
flash_start = now + FLASH_LATENCY;
flash_start = now + flash_latency;
// Beat 1 (every 4th) = RED, others = WHITE
if (current_beat % 4 == 0) {
mux.set_led_color(6, 255, 0, 0);
@@ -122,6 +123,16 @@ void handle_serial_command(const String& cmd) {
} else if (cmd == "exp") {
Serial.printf("[CMD] EXP ADC=%d MIDI=%d\n",
exp_pedal.get_raw(), exp_pedal.get_value());
} else if (cmd == "latency") {
Serial.printf("[CMD] Current flash latency: %d ms\n", flash_latency);
} else if (cmd.startsWith("latency ")) {
int val = atoi(cmd.c_str() + 8);
if (val >= 0 && val <= 500) {
flash_latency = val;
Serial.printf("[CMD] Flash latency set to %d ms\n", flash_latency);
} else {
Serial.println("[CMD] Latency must be 0-500 ms");
}
} else if (cmd == "usb") {
Serial.printf("[CMD] USB mounted: %s\n", TinyUSBDevice.mounted() ? "YES" : "NO");
Serial.printf("[CMD] USB ready: %s\n", TinyUSBDevice.ready() ? "YES" : "NO");
@@ -166,6 +177,8 @@ void handle_serial_command(const String& cmd) {
Serial.println(" red/green/blue - solid colour");
Serial.println(" pixel0/pixel1 - single pixel test");
Serial.println(" exp - expression pedal ADC/MIDI value");
Serial.println(" latency - show current flash latency");
Serial.println(" latency N - set flash latency to N ms (0-500)");
Serial.println(" usb - USB connection status and descriptor info");
Serial.println(" gpiotest - raw GPIO pin diagnostic");
Serial.println(" rawled - bit-bang WS2812 (no library)");