Intermediate commit aith support added for AVR (GPIO,ADC). Does not support other targets.

1 files changed, 42 insertions, 0 deletions

diff --git a/src/c/hardware/avr/adc/u8AVRADCSetups.c b/src/c/hardware/avr/adc/u8AVRADCSetups.c
new file mode 100644
index 0000000..620f80f
--- /dev/null
+++ b/src/c/hardware/avr/adc/u8AVRADCSetups.c
@@ -0,0 +1,42 @@
+// Function to initialise ADC of AVR
+//
+// Calling Sequence
+//     AVRSetupADC(uint8 prescalar, uint8 adc_ref)
+//
+// Parameters
+//     prescalar: prescalar to be used for generating ADC clock (0-7)
+//     adc_ref	: reference voltage to be used for ADC conversion
+//              0 -> Voltage on VREF pin
+//              1 -> Voltage on AVCC pin
+//              2 -> Internal 2.56 reference voltage       
+//
+// Description
+//     This function initialises ADc of AVR with given parameters. 'prescalar' is 
+//     needed for deciding ADC clock. ADC clock should be between 50KHz and 200KHz
+//     and it given as (MCU clock/2^prescalar). Select appropriate prescalar depending
+//     on MCU clock. 'adc_ref' selects one of the available reference voltage sources
+//     available
+// Examples
+//     AVRADCSetup(128,0)
+//
+// Authors
+//     Siddhesh Wani
+//
+
+#include "AVRPeripheralADC.h"
+
+
+uint8 u8AVRADCSetups(uint8 prescalar, uint8 adc_ref)
+{
+    /*Set the prescalar value*/
+    ADCSRA |= (prescalar & 0x07);
+
+    /*Set the adc reference voltage*/
+    ADMUX |= ((adc_ref & 0x03) << 6);
+
+    /*Enable ADC hardware. Set ADEN bit*/
+    ADCSRA |= (1<<7); 	
+
+    return 0;
+}
+