I'm trying to set up a VGA sync signal for 640x480, using a Pi Pico 2, and using arduino-pico core, but all i get on my display is "Invalid Format".
I'm not using PIOs, instead i'm using one regular core. I know it can be done without PIOs because PicoMiteVGA also handles video generation using regular cores instead of PIOs. I'm gonna be using a full Pico 2 just for video generation so performance overhead is not a concern. And i'm sure the correct Pico pins are connected to the correct VGA connector pins, so it has to be the code. Here is the code:
Any ideas why the sync signal is not working properly and not being detected properly by the VGA display? I appreciate the help!
I'm not using PIOs, instead i'm using one regular core. I know it can be done without PIOs because PicoMiteVGA also handles video generation using regular cores instead of PIOs. I'm gonna be using a full Pico 2 just for video generation so performance overhead is not a concern. And i'm sure the correct Pico pins are connected to the correct VGA connector pins, so it has to be the code. Here is the code:
Code:
int VSYNC = 17;int HSYNC = 16;void setup() { pinMode(VSYNC, OUTPUT); pinMode(HSYNC, OUTPUT); pinMode(19, OUTPUT); // Initialize sync signals gpio_put(VSYNC, HIGH); gpio_put(HSYNC, HIGH); gpio_put(19, HIGH); // put your setup code here, to run once:}int line = 0;void generate_sync() { while(true) { // Horizontal Sync Timing // Front Porch busy_wait_us(0.635); // Sync Pulse gpio_put(HSYNC, LOW); busy_wait_us(3.81); gpio_put(HSYNC, HIGH); // Back Porch + Visible Area busy_wait_us(1.906); line++; // Vertical Sync Timing if (line == 525) { line = 0; } if (line == 0) // Start VSYNC pulse { gpio_put(VSYNC, LOW); }else if (line == 2) // End VSYNC pulse after 2 lines { gpio_put(VSYNC, HIGH); } } }void loop() { generate_sync();}Statistics: Posted by PU5PSY — Thu Feb 13, 2025 2:09 am — Replies 0 — Views 13