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pico-led-matrix
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firmware: improvements

main
radex 2024-04-15 00:29:16 +02:00
parent b54dcc93c3
commit 69c6ab51aa
Signed by: radex
SSH Key Fingerprint: SHA256:hvqRXAGG1h89yqnS+cyFTLKQbzjWD4uXIqw7Y+0ws30
1 changed files with 23 additions and 20 deletions
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43
firmware/src/main.cpp
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@ -147,53 +147,60 @@ void loop() {
// start selecting rows
digitalWrite(ROW_SER, HIGH);
for (int y = 0; y < ROW_COUNT; y++) {
for (int yCount = 0; yCount < ROW_COUNT; yCount++) {
int y = ROW_COUNT - 1 - yCount;
// brigthness - pushing data takes 40us, so to maximize brightness (at high brightness phases)
// we want to keep the matrix on during update (except during latch). At low brightness phases,
// we want it off to actually be dim
bool brightPhase = brightnessPhase >= 2;
digitalWrite(ROW_OE, !brightPhase);
// digitalWrite(ROW_OE, !brightPhase);
// next row
pulsePin(ROW_SRCLK);
// only one row
digitalWrite(ROW_SER, LOW);
// we use 7/8 stages on shift registers + 1 is unused
if (y % 20 % 7 == 0) {
int moduleY = yCount % 20;
if (moduleY == 0) {
pulsePin(ROW_SRCLK);
}
if (y % 20 == 0 && y != 0) {
if (moduleY == 7 || moduleY == 14 || (moduleY == 0 && yCount != 0)) {
pulsePin(ROW_SRCLK);
}
// clear columns
clearShiftReg(COL_SRCLK, COL_SRCLR);
// set row with column' data
// set row data
for (int x = 0; x < COL_COUNT; x++) {
// we use 7/8 stages on shift registers + 1 is unused
if (x % 20 % 7 == 0) {
pulsePin(COL_SRCLK);
}
if (x % 20 == 0 && x != 0) {
pulsePin(COL_SRCLK);
}
// get value
// NOTE: values are loaded right-left
uint8_t pxValue = framebuffer[y * ROW_COUNT + x];
// apply brightness
bool gotLight = (pxValue >> (4 + brightnessPhase)) & 1;
// set value (note: inverted logic)
digitalWrite(COL_SER, !gotLight);
// push value
pulsePin(COL_SRCLK);
// we use 7/8 stages on shift registers + 1 is unused
int moduleX = x % 20;
if (moduleX == 0) {
pulsePin(COL_SRCLK);
}
if (moduleX == 6 || moduleX == 13 || moduleX == 19) {
pulsePin(COL_SRCLK);
}
}
// disable columns before latch
outputEnable(ROW_OE, false);
// latch rows and columns
pulsePin(ROW_RCLK);
pulsePin(COL_RCLK);
// enable columns after latch
outputEnable(ROW_OE, brightPhase);
// show for a certain period
outputEnable(ROW_OE, true);
@ -230,11 +237,7 @@ void loop2() {
// copy to framebuffer
// TODO: mutex? double buffer? or something...
// TODO: learn to use memcpy lmao
for (int x = COL_COUNT - 1; x >= 0; x--) {
for (int y = 0; y < ROW_COUNT; y++) {
framebuffer[x * ROW_COUNT + y] = buffer[(COL_COUNT - 1 - x) * ROW_COUNT + y];
}
}
memcpy(framebuffer, buffer, ROW_COUNT * COL_COUNT);
free(buffer);