* Improve uart dma ring buffer. Sending dma still missing

* Add digio module for controlling LEDs, Loudspeaker, and the Digital IOs
* General code improvements

stm-firmware/main.c

@@ -15,6 +15,7 @@
 #include <clock-enable-manager.h>
 #include <uart/uart.h>
 #include <shell.h>
+#include <digio.h>
 
 static void setup_nvic_priorities()
 {
@@ -35,18 +36,16 @@ int main()
 	size_t uart_input_len;
 	shellmatta_handle_t shell_handle;
 
-	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(RCC_AHB1ENR_GPIOBEN));
-
-	__DSB();
-	GPIOB->MODER = OUTPUT(2) | OUTPUT(3);
-	GPIOB->ODR |= (1<<2);
-
 	setup_nvic_priorities();
 	systick_setup();
 
 	//setup_dma(&adc_results, 3);
 	adc_pt1000_setup_meas();
 
+	digio_setup_default_all();
+	led_setup();
+	loudspeaker_setup();
+
 	uart_init_with_dma();
 
 	shell_handle = shell_init();