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

1 files changed, 46 insertions, 0 deletions

diff --git a/src/c/hardware/avr/adc/u8AVRReadADCs.c b/src/c/hardware/avr/adc/u8AVRReadADCs.c
new file mode 100644
index 00000000..71fe1363
--- /dev/null
+++ b/src/c/hardware/avr/adc/u8AVRReadADCs.c
@@ -0,0 +1,46 @@
+// Function to get voltage on analog pin on AVR
+//
+// Calling Sequence
+//     u8AVRReadADCs(channel)
+//
+// Parameters
+//     channel 	: Select which channel is to be read. Values from 0-7 select one 
+//	             of the pins ADC0-ADC7. For other possible channel values refer
+//               datasheet
+//   Returns->  
+//     result 	: Digital value for the voltage present on channel selected
+//
+// Description
+//     This function returns digital value for present on adc pins. 'channel' 
+//     selects which of the ADC0-ADC7 is to be used for reading analog value.
+//     Apart from reading just ADC0-ADC7 other it can also read differential 
+//     voltages between some pins. For channel values for those options, please 
+//     refer datasheet.      
+//
+// Examples
+//     adc_result = u8AVRReadADC(0)   //Read ADC0
+//
+// Authors
+//     Siddhesh Wani
+//
+
+
+#include "AVRPeripheralADC.h"
+
+uint16 u8AVRReadADCs(uint8 channel)
+{
+	/*Set ADC conversion channel*/
+    ADMUX |= (channel & 0x1F);
+
+	/*Start ADC conversion. Set 'ADSC' bit*/
+	ADCSRA |= (1<<6);
+
+	/*Wait for conversion to complete. Check 'ADIF' bit*/
+    while(!(ADCSRA & (1<<4)));
+
+	/*Clear ADIF flag*/
+    ADCSRA |= (1<<4);
+
+	/*ADC conversion result is stored in ADCH/L registers*/
+	return (ADC);
+}