add UI to tune each channel to a constant offset (#75)

src/ansible_grid.c

@@ -289,7 +289,8 @@ void refresh_grid_tuning(void) {
 
 	memset(monomeLedBuffer + R5, L0, 10);
 	monomeLedBuffer[R5 + tuning_octave] = L1;
-	monomeLedBuffer[R5 + 12] = L1; // reload / longpress to restore factory default
+	monomeLedBuffer[R5 + 11] = L1; // reload / longpress to restore factory default
+	monomeLedBuffer[R5 + 13] = L1; // save offsets key
 	monomeLedBuffer[R5 + 14] = L1; // save interpolated key
 	monomeLedBuffer[R5 + 15] = L1; // save as-is key
 
@@ -389,7 +390,7 @@ void grid_keytimer(void) {
 
 			if (view_tuning) {
 				if (y == 5) {
-					if (x == 12) {
+					if (x == 11) {
 						// reload factory default, don't immediately save it
 						for (uint8_t i = 0; i < 4; i++) {
 							for (uint8_t j = 0; j < 120; j ++) {
@@ -398,9 +399,15 @@ void grid_keytimer(void) {
 						}
 						restore_grid_tuning();
 					}
+					if (x == 13) {
+						// apply fixed offset and save
+						fit_tuning(0);
+						flashc_memcpy((void*)f.tuning_table, tuning_table, sizeof(tuning_table), true);
+						restore_grid_tuning();
+					}
 					if (x == 14) {
 						// interpolate octaves and save
-						fit_tuning();
+						fit_tuning(1);
 						flashc_memcpy((void*)f.tuning_table, tuning_table, sizeof(tuning_table), true);
 						restore_grid_tuning();
 					}
@@ -1634,11 +1641,14 @@ void handler_KriaGridKey(s32 data) {
 			}
 			else if(view_tuning) {
 				if (y == 5) {
-					if (x == 12) {
+					if (x == 11) {
 						init_tuning();
 						restore_grid_tuning();
+					} else if (x == 13) {
+						fit_tuning(0);
+						restore_grid_tuning();
 					} else if (x == 14) {
-						fit_tuning();
+						fit_tuning(1);
 						restore_grid_tuning();
 					}
 				}

src/main.c

@@ -466,21 +466,36 @@ void init_tuning(void) {
 	memcpy((void *)&tuning_table, &f.tuning_table, sizeof(tuning_table));
 }
 
-void fit_tuning(void) {
-	for (uint8_t i = 0; i < 4; i++) {
-		fix16_t step = 0;
-		for (uint8_t j = 0; j < 10; j++) {
-			fix16_t acc = fix16_from_int(tuning_table[i][j*12]);
-			if (j < 9) {
-				step = fix16_div(
-					fix16_from_int(tuning_table[i][(j+1)*12] - tuning_table[i][j*12]),
-					fix16_from_int(12));
+void fit_tuning(int mode) {
+	switch (mode) {
+		case 0: { // fixed offset per channel
+			for (uint8_t i = 0; i < 4; i++) {
+				uint16_t offset = tuning_table[i][0];
+				for (uint8_t j = 0; j < 120; j++) {
+					tuning_table[i][j] = (ET[j] << 2) + offset;
+				}
 			}
-			for (uint8_t k = j*12; k < (j+1)*12; k++) {
-				tuning_table[i][k] = fix16_to_int(acc);
-				acc = fix16_add(acc, step);
+			break;
+		}
+		case 1: { // linear fit between octaves
+			for (uint8_t i = 0; i < 4; i++) {
+				fix16_t step = 0;
+				for (uint8_t j = 0; j < 10; j++) {
+					fix16_t acc = fix16_from_int(tuning_table[i][j*12]);
+					if (j < 9) {
+						step = fix16_div(
+							fix16_from_int(tuning_table[i][(j+1)*12] - tuning_table[i][j*12]),
+							fix16_from_int(12));
+					}
+					for (uint8_t k = j*12; k < (j+1)*12; k++) {
+						tuning_table[i][k] = fix16_to_int(acc);
+						acc = fix16_add(acc, step);
+					}
+				}
 			}
+			break;
 		}
+		default: break;
 	}
 }
 

src/main.h

@@ -77,7 +77,7 @@ extern uint16_t tuning_table[4][120];
 void (*clock)(u8 phase);
 void init_tuning(void);
 void default_tuning(void);
-void fit_tuning(void);
+void fit_tuning(int mode);
 
 extern void handler_None(s32 data);
 extern void clock_null(u8 phase);