Rebuild DAC and first functioning PoC

By just counting the gpio mask up, we can see the different voltages update they should :^)

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.20)
 
 include(pico_sdk_import.cmake)
 
-project(PicoNix C CXX ASM)
+project(PicoVGA C CXX ASM)
 
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_CXX_STANDARD 23)
@@ -15,7 +15,9 @@ add_executable(main
 
 target_link_libraries(main
     pico_stdlib
-    pico_cyw43_arch_none
+    hardware_gpio
 )
 
 pico_add_extra_outputs(main)
+pico_enable_stdio_usb(main 0)
+pico_enable_stdio_uart(main 1)

flake.nix

@@ -36,6 +36,7 @@
 
                     usbutils
                     picotool
+                    picocom
                   ]
                   ++ [ pico-sdk ];
 

src/main.cpp

@@ -1,22 +1,25 @@
-/**
+#include "hardware/gpio.h"
- * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include "pico/cyw43_arch.h"
 #include "pico/stdlib.h"
+#include <cstdint>
+#include <cstdio>
+#include <pico/time.h>
+
+constexpr static uint start_pin = 2;
+constexpr static uint pin_mask = (0xFFF) << start_pin;
 
 int main() {
   stdio_init_all();
-  if (cyw43_arch_init()) {
+
-    printf("Wi-Fi init failed");
+  for (uint offset{}; offset != 14; ++offset) {
-    return -1;
+    auto const pin = start_pin + offset;
+    gpio_init(pin);
+    gpio_set_dir(pin, GPIO_OUT);
   }
-  while (true) {
+
-    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
+  for (uint16_t pixel{};; ++pixel) {
-    sleep_ms(500);
+    auto const set_mask = (pixel & 0xFFF) << start_pin;
-    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
+    printf("Set mask=%03x", pixel);
-    sleep_ms(500);
+    gpio_put_masked(pin_mask, set_mask);
+    sleep_ms(100);
   }
 }