adc-power: add parallel parent makefile

and fix the bugs it shows from me not maintaining this code!

tests/adc-power/Makefile

@@ -0,0 +1,15 @@
+# This is just a stub makefile used for travis builds
+# to keep things all compiling. Normally you'd use
+# one of the makefiles directly.
+
+# These hoops are to enable parallel make correctly.
+GZ_ALL := $(wildcard Makefile.*)
+
+all: $(GZ_ALL:=.all)
+clean: $(GZ_ALL:=.clean)
+
+%.all:
+	make -f $* all
+%.clean:
+	make -f $* clean
+	

tests/adc-power/adc-power.c

@@ -147,6 +147,7 @@ static float adc_calc_tempf(unsigned int ts_v, unsigned int vref) {
 	float slope = (110-30) * 1.0f / (ST_TSENSE_CAL2_110C - ST_TSENSE_CAL1_30C) * 1.0f;
 	return slope * (adjusted_vtemp - ST_TSENSE_CAL1_30C) + 30;
 #else
+	(void)vref;
 	return ts_v * 1.0;
 #endif
 }
@@ -157,6 +158,7 @@ static int adc_calc_tempi(unsigned int ts, unsigned int vref) {
 	int slope = (110-30) / (ST_TSENSE_CAL2_110C - ST_TSENSE_CAL1_30C);
 	return slope * (adjusted_vtemp - ST_TSENSE_CAL1_30C) + 30;
 #else
+	(void)vref;
 	return ts * 1.00;
 #endif
 }

tests/adc-power/main-stm32f072-disco.c

@@ -23,7 +23,7 @@ void setup_usart(void)
 	usart_set_baudrate(dev, 115200);
 	usart_set_databits(dev, 8);
 	usart_set_parity(dev, USART_PARITY_NONE);
-	usart_set_stopbits(dev, USART_CR2_STOP_1_0BIT);
+	usart_set_stopbits(dev, USART_CR2_STOPBITS_1);
 	usart_set_mode(dev, USART_MODE_TX);
 	usart_set_flow_control(dev, USART_FLOWCONTROL_NONE);
 

tests/adc-power/main-stm32l4-disco.c

@@ -20,7 +20,7 @@
 #define LED_DISCO_GREEN_PORT GPIOE
 #define LED_DISCO_GREEN_PIN GPIO8
 
-int hack(void) {
+static int hack(void) {
 	pwr_set_vos_scale(PWR_SCALE1);
 	flash_set_ws(FLASH_ACR_LATENCY_2WS);
 	rcc_set_msi_range(RCC_CR_MSIRANGE_48MHZ);