From 04885a3b447c82437d919d467328800eb00af629 Mon Sep 17 00:00:00 2001
From: Jack Humbert <jack.humb@gmail.com>
Date: Fri, 21 Aug 2015 10:46:53 -0400
Subject: preonic

---
 keyboard/preonic/analog.h | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 keyboard/preonic/analog.h

(limited to 'keyboard/preonic/analog.h')

diff --git a/keyboard/preonic/analog.h b/keyboard/preonic/analog.h
new file mode 100644
index 0000000000..9b95a93bef
--- /dev/null
+++ b/keyboard/preonic/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
-- 
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