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-rw-r--r--keyboard/planck/analog.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/keyboard/planck/analog.h b/keyboard/planck/analog.h
new file mode 100644
index 0000000000..9b95a93bef
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+++ b/keyboard/planck/analog.h
@@ -0,0 +1,36 @@
+#ifndef _analog_h_included__
+#define _analog_h_included__
+
+#include <stdint.h>
+
+void analogReference(uint8_t mode);
+int16_t analogRead(uint8_t pin);
+int16_t adc_read(uint8_t mux);
+
+#define ADC_REF_POWER (1<<REFS0)
+#define ADC_REF_INTERNAL ((1<<REFS1) | (1<<REFS0))
+#define ADC_REF_EXTERNAL (0)
+
+// These prescaler values are for high speed mode, ADHSM = 1
+#if F_CPU == 16000000L
+#define ADC_PRESCALER ((1<<ADPS2) | (1<<ADPS1))
+#elif F_CPU == 8000000L
+#define ADC_PRESCALER ((1<<ADPS2) | (1<<ADPS0))
+#elif F_CPU == 4000000L
+#define ADC_PRESCALER ((1<<ADPS2))
+#elif F_CPU == 2000000L
+#define ADC_PRESCALER ((1<<ADPS1) | (1<<ADPS0))
+#elif F_CPU == 1000000L
+#define ADC_PRESCALER ((1<<ADPS1))
+#else
+#define ADC_PRESCALER ((1<<ADPS0))
+#endif
+
+// some avr-libc versions do not properly define ADHSM
+#if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
+#if !defined(ADHSM)
+#define ADHSM (7)
+#endif
+#endif
+
+#endif