iPod Classic: ADC updates

Add code to read USB D+/D- and accessory ADCs, it is shown in HW
debug menu, might be useful in future for RB and/or the bootloader
to identify external USB chargers.

Change-Id: Ia48ca5e06bb7ddc52bb55abedde6734653ce8dba

1 files changed, 15 insertions, 5 deletions

diff --git a/firmware/target/arm/s5l8702/ipod6g/adc-target.h b/firmware/target/arm/s5l8702/ipod6g/adc-target.h
index d4dce3d31f..bedc0a8447 100644
--- a/firmware/target/arm/s5l8702/ipod6g/adc-target.h
+++ b/firmware/target/arm/s5l8702/ipod6g/adc-target.h
@@ -21,13 +21,23 @@
 #ifndef _ADC_TARGET_H_
 #define _ADC_TARGET_H_
 
-#define NUM_ADC_CHANNELS 4
+#include <stdbool.h>
+#include "config.h"
 
-#define ADC_UNKNOWN_0   0
-#define ADC_UNKNOWN_1   1
-#define ADC_BATTERY     2
-#define ADC_UNKNOWN_3   3
+enum
+{
+    ADC_BATTERY = 0,
+    ADC_USBDATA,
+    ADC_ACCESSORY,
+    NUM_ADC_CHANNELS
+};
 
 #define ADC_UNREG_POWER ADC_BATTERY /* For compatibility */
 
+unsigned short adc_read_millivolts(int channel);
+unsigned int adc_read_battery_voltage(void);
+unsigned int adc_read_usbdata_voltage(bool dp);
+int adc_read_accessory_resistor(void);
+const char *adc_name(int channel);
+
 #endif