Setup stdio to use RTT for debug purposes

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "lib/pico-sdk"]
 	path = lib/pico-sdk
 	url = https://github.com/raspberrypi/pico-sdk
+[submodule "lib/rtt"]
+	path = lib/rtt
+	url = https://github.com/adfernandes/segger-rtt

CMakeLists.txt

@@ -7,7 +7,13 @@ project(vibe-check)
 
 pico_sdk_init()
 
+include_directories(
+    ${CMAKE_SOURCE_DIR}/lib/rtt/RTT
+)
+
 add_executable(vibe-check
+    lib/rtt/RTT/SEGGER_RTT.c
+    src/stdio_rtt.c
     src/main.c
 )
 

lib/rtt

@@ -0,0 +1 @@
+Subproject commit 660fa2589a67cc87c9a112e405531c53b77504ad

shell.nix

@@ -1,7 +1,7 @@
 { pkgs ? import <nixpkgs> {} }:
 pkgs.mkShell {
   buildInputs = with pkgs; [
-    cmake ninja python3 gcc-arm-embedded
+    cmake cmakeCurses ninja python3 gcc-arm-embedded
     picotool
   ];
 }

src/main.c

@@ -1,7 +1,9 @@
 #include <stdio.h>
 #include "pico/stdlib.h"
 #include "pico/cyw43_arch.h"
-#include "btstack.h"
+#include "stdio_rtt.h"
+
+// #include "btstack.h"
 
 #ifndef CYW43_WL_GPIO_LED_PIN
     #error no WiFi LED on board, wrong -DPICO_BOARD?
@@ -11,7 +13,9 @@
 // https://github.com/buttplugio/buttplug/blob/master/buttplug/src/server/device/protocol/sakuraneko.rs
 
 int main() {
-    stdio_init_all();
+    // stdio_init_all();
+    stdio_rtt_init();
+
     if (cyw43_arch_init()) {
         printf("WiFi init failed");
         return -1;

src/stdio_rtt.c

@@ -0,0 +1,20 @@
+#include "pico/stdio/driver.h"
+#include "stdio_rtt.h"
+#include "SEGGER_RTT.h"
+
+void stdio_rtt_init(void) {
+    stdio_set_driver_enabled(&stdio_rtt, true);
+}
+
+static void stdio_rtt_out_chars(const char *buf, int length) {
+    SEGGER_RTT_Write(0, buf, length);
+}
+
+static int stdio_rtt_in_chars(char *buf, int length) {
+    return SEGGER_RTT_Read(0, buf, length);
+}
+
+stdio_driver_t stdio_rtt = {
+    .out_chars = stdio_rtt_out_chars,
+    .in_chars = stdio_rtt_in_chars,
+};

src/stdio_rtt.h

@@ -0,0 +1,8 @@
+#ifndef STDIO_RTT_H
+#define STDIO_RTT_H
+#include "pico/stdio.h"
+
+extern stdio_driver_t stdio_rtt;
+void stdio_rtt_init(void);
+
+#endif