diff --git a/src/main.c b/src/main.c
--- a/src/main.c
+++ b/src/main.c
@@ -1,3 +1,7 @@
+//
+// WSPRHAB: Minimal high-altitude balloon tracker with WSPR telemetry
+//
+
 #include "stm32f0xx_hal.h"
 #include "si5351.h"
 #include "jtencode.h"
@@ -10,6 +14,7 @@
 
 
 void sysclk_init(void);
+
 //#define WSPR_DEFAULT_FREQ 14097100UL
 #define WSPR_DEFAULT_FREQ 10140100UL
 #define WSPR_TONE_SPACING 146 // ~1.46 Hz
@@ -61,8 +66,8 @@ int main(void)
 
     sysclk_init();
     gpio_init();
-    MX_DMA_Init();
-    MX_ADC_Init();
+    dma_init();
+    adc_init();
     i2c_init();
 
     HAL_GPIO_WritePin(OSC_NOTEN, 0);
@@ -192,6 +197,7 @@ void sysclk_init(void)
 
     HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
 
+    __SYSCFG_CLK_ENABLE();
     // SysTick_IRQn interrupt configuration 
     HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
 }