Add missing board detection macros (#448)

* add board detection macros for Sparkfun & RPi Pico / VGA Board

src/boards/include/boards/pico.h

@@ -14,6 +14,9 @@
 #ifndef _BOARDS_PICO_H
 #define _BOARDS_PICO_H
 
+// For board detection
+#define RASPBERRYPI_PICO
+
 // --- UART ---
 #ifndef PICO_DEFAULT_UART
 #define PICO_DEFAULT_UART 0

src/boards/include/boards/sparkfun_micromod.h

@@ -17,6 +17,9 @@
 #ifndef _BOARDS_SPARKFUN_MICROMOD_H
 #define _BOARDS_SPARKFUN_MICROMOD_H
 
+// For board detection
+#define SPARKFUN_MICROMOD
+
 #ifndef PICO_DEFAULT_UART
 #define PICO_DEFAULT_UART 0
 #endif

src/boards/include/boards/sparkfun_promicro.h

@@ -17,6 +17,9 @@
 #ifndef _BOARDS_SPARKFUN_PROMICRO_H
 #define _BOARDS_SPARKFUN_PROMICRO_H
 
+// For board detection
+#define SPARKFUN_PROMICRO
+
 #ifndef PICO_DEFAULT_UART
 #define PICO_DEFAULT_UART 0
 #endif

src/boards/include/boards/sparkfun_thingplus.h

@@ -17,6 +17,9 @@
 #ifndef _BOARDS_SPARKFUN_THINGPLUS_H
 #define _BOARDS_SPARKFUN_THINGPLUS_H
 
+// For board detection
+#define SPARKFUN_THINGPLUS
+
 #ifndef PICO_DEFAULT_UART
 #define PICO_DEFAULT_UART 0
 #endif

src/boards/include/boards/vgaboard.h

@@ -12,6 +12,9 @@
 #ifndef _BOARDS_VGABOARD_H
 #define _BOARDS_VGABOARD_H
 
+// For board detection
+#define RASPBERRYPI_VGABOARD
+
 // Audio pins. I2S BCK, LRCK are on the same pins as PWM L/R.
 // - When outputting I2S, PWM sees BCK and LRCK, which should sound silent as
 //   they are constant duty cycle, and above the filter cutoff