From 277d1edfa17bf3719d90ddbac8e31f6181e952c3 Mon Sep 17 00:00:00 2001
From: Sandeep Gupta
Date: Sun, 18 Jun 2017 23:55:40 +0530
Subject: First commit

---
 src/c/hardware/avr/adc/u8AVRADCSetups.c | 43 +++++++++++++++++
 src/c/hardware/avr/adc/u8AVRReadADCs.c  | 82 +++++++++++++++++++++++++++++++++
 2 files changed, 125 insertions(+)
 create mode 100644 src/c/hardware/avr/adc/u8AVRADCSetups.c
 create mode 100644 src/c/hardware/avr/adc/u8AVRReadADCs.c

(limited to 'src/c/hardware/avr/adc')

diff --git a/src/c/hardware/avr/adc/u8AVRADCSetups.c b/src/c/hardware/avr/adc/u8AVRADCSetups.c
new file mode 100644
index 00000000..66f491b2
--- /dev/null
+++ b/src/c/hardware/avr/adc/u8AVRADCSetups.c
@@ -0,0 +1,43 @@
+// Function to initialise ADC of AVR
+//
+// Calling Sequence
+//     AVRSetupADC(uint8 prescaler, uint8 adc_ref)
+//
+// Parameters
+//     prescaler: prescaler 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. 'prescaler' is 
+//     needed for deciding ADC clock. ADC clock should be between 50KHz and 200KHz
+//     and it given as (MCU clock/2^prescaler). Select appropriate prescaler depending
+//     on MCU clock. 'adc_ref' selects one of the available reference voltage sources
+//     available
+// Examples
+//     AVRADCSetup(128,0)
+//
+// Authors
+//     Siddhesh Wani
+//     Ashish Kamble  
+
+#include "AVRPeripheralADC.h"
+
+
+uint8 u8AVRADCSetups(uint8 prescaler, uint8 adc_ref)
+{
+/*Set the prescaler value*/
+  ADCSRA |= (prescaler & 0x07);
+
+    /*Set the adc reference voltage*/
+  ADMUX |= ((adc_ref & 0x03) << 6);
+
+    /*Enable ADC hardware. Set ADEN bit*/
+ADCSRA |= (1<<7); 	
+
+return 0;   
+}
+
+
diff --git a/src/c/hardware/avr/adc/u8AVRReadADCs.c b/src/c/hardware/avr/adc/u8AVRReadADCs.c
new file mode 100644
index 00000000..302f8c82
--- /dev/null
+++ b/src/c/hardware/avr/adc/u8AVRReadADCs.c
@@ -0,0 +1,82 @@
+// Copyright (C) 2017 - IIT Bombay - FOSSEE
+//
+// This file must be used under the terms of the CeCILL.
+// This source file is licensed as described in the file COPYING, which
+// you should have received as part of this distribution.  The terms
+// are also available at
+// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+// Organization: FOSSEE, IIT Bombay
+// Email: toolbox@scilab.in
+
+// 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
+//     Ashish Kamble
+
+
+#include "AVRPeripheralADC.h"
+
+uint8 u8AVRReadADCs(uint8 channel)
+{
+
+uint8 i;
+
+  ADCH=0x00;
+
+  i=channel&0x07;
+  ADMUX=i|0x60;                //i|0x40 for 10 bits
+  ADCSRA|=1<<ADSC;
+
+  while(ADCSRA & (1<<ADSC));       // wait for conv. to complete
+  uint8 temp=ADCH;      //unsigned int temp=ADC;   for 10 bits
+
+  return temp;
+	
+}
+
+
+
+
+
+
+
+
+
+
+/*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);
+
+
-- 
cgit