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authorThat-Canadian <poole.chris.11@gmail.com>2017-07-10 16:53:49 -0400
committerThat-Canadian <poole.chris.11@gmail.com>2017-07-10 16:53:49 -0400
commit55ed97af1e2fb183d2b6c34bc8659a03cbda090c (patch)
treea3950f5dbe7d12f29c2b9a77d49b4e807af87ae6 /drivers/avr/analog.h
parent1fdf3c84fe2bb10698bf528a9726aab5af12ca6d (diff)
parent07bf8522ca23a7665852bb9defff0749c76f5e91 (diff)
Merge branch 'master' into minidox
Diffstat (limited to 'drivers/avr/analog.h')
-rw-r--r--drivers/avr/analog.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/avr/analog.h b/drivers/avr/analog.h
new file mode 100644
index 0000000000..8d93de7dc2
--- /dev/null
+++ b/drivers/avr/analog.h
@@ -0,0 +1,52 @@
+/* Copyright 2015 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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