added guhRF; added atmega256rfr2 support

platform/RaspBee/dev/adc.h

@@ -0,0 +1,65 @@
+#ifndef __ADC_ARCH_H__
+#define __ADC_ARCH_H__
+
+#include <avr/io.h>
+
+/*
+ * Reference voltage
+ * The default is 1.6V reference voltage
+ * The selected reference voltage is the maximum voltage that can be
+ * measured.
+ * Directly provide shifted variants so we don't need to shift.
+ */
+#define ADC_1_5      (2<<6)
+#define ADC_1_6      (3<<6)
+#define ADC_1_8      (1<<6)
+#define ADC_EXTERNAL (0<<6)
+#define ADC_DEFAULT  ADC_1_6
+
+/* sometimes it's desirable to decouple setup / finish from sampling */
+
+static inline void adc_setup (uint8_t ref_volt, uint8_t pin)
+{
+  ADMUX = ref_volt | (pin & 0x7);
+  ADCSRA = _BV(ADEN) | _BV(ADPS0) | _BV(ADPS2);
+}
+
+static inline int adc_read (void)
+{
+  ADCSRA |= (1 << ADSC);
+  loop_until_bit_is_clear (ADCSRA, ADSC);
+  return ADC;
+}
+
+static inline void adc_fin (void)
+{
+    ADCSRA = 0;
+    ADMUX  = 0;
+}
+  
+static inline void adc_init (void)
+{
+    uint8_t temp;
+    ADCSRC = 0;
+    ADCSRB = 0;
+    adc_fin ();
+    /*
+     * Disable JTAG interface
+     * Hardware manual about JTD bit:
+     * "In order to avoid unintentional disabling or enabling of the
+     * JTAG interface, a timed sequence must be followed when changing
+     * this bit: The application software must write this bit to the
+     * desired value twice within four cycles to change its value."
+     * 15.4.1 "MCUCR - MCU Control Register", p. 219
+     */
+    temp = MCUCR | (1 << JTD);
+    MCUCR = temp;
+    MCUCR = temp;
+}
+
+int readADC(uint8_t pin);
+long readVcc();
+int readInternalTemp(void);
+void analogReference(uint8_t mode);
+
+#endif /* __ADC_ARCH_H__ */