modified ADC driver

ADC/src/adc.h

@@ -14,6 +14,12 @@
 #include "std_types.h"
 
 
+/*******************************************************************************
+ *                          Configurations	                                   *
+ *******************************************************************************/
+
+#define ADC_MAXIMUM_VALUE    1023
+#define ADC_REF_VOLT_VALUE   2.56
 
 /*******************************************************************************
  *                         Types Declaration                                   *
@@ -44,8 +50,6 @@ typedef struct{
  *******************************************************************************/
 
 
-
-
 /*
  * Description :
  * Initialize the ADC:

LM 35 - Temperature Sensor/src/adc.c

@@ -0,0 +1,78 @@
+ /******************************************************************************
+ *
+ * Module: Analog to Digital Converter
+ * File Name: adc.h
+ * Description: source file for the ADC driver
+ * Author: Ibrahim Mohamed
+ *
+ *******************************************************************************/
+
+#include <avr/io.h>
+#include "adc.h"
+#include "common_macros.h"
+#include "gpio.h"
+
+
+/*******************************************************************************
+ *                      Functions Definitions                                  *
+ *******************************************************************************/
+
+
+
+/*
+ * Description :
+ * Initialize the ADC:
+ */
+void ADC_init(const ADC_ConfigType * Config_Ptr){
+
+	/* ADMUX Register Bits Description:
+	 * REFS1:0 = 00 to choose to connect external reference, internal reference or AVCC
+	 * ADLAR   = 0 right adjusted
+	 * MUX4:0  = 00000 to choose channel 0 as initialization
+	 */
+
+	ADMUX = 0;
+
+	/*
+	* insert the required voltage value in the last 2 bits bits (REFS0 and REFS1)
+	* of ADMUX Register
+	*/
+	ADMUX = (ADMUX & 0x3F) | (Config_Ptr->ref_volt);
+
+
+	/* ADCSRA Register Bits Description:
+	* ADEN    = 1 Enable ADC
+	* ADIE    = 0 Disable ADC Interrupt
+	* ADATE   = 0 Disable Auto Trigger
+	* ADPS2:0 = XXX to choose ADC_Clock (F_CPU/X where X is 2,4,8,16,32 or 64) --> ADC must operate in range 50-200Khz
+	*/
+
+	ADCSRA = (1<<ADEN) | (1<<ADPS1);
+	ADCSRA = (ADCSRA & 0xF4) | (Config_Ptr->prescaler);
+
+}
+
+
+
+/*
+ * Description :
+ * reads the channel from the ADC:
+ */
+uint16 ADC_readChannel(uint8 ch_num){
+
+	ch_num &= 0x07;	/* Input channel number must be from 0 --> 7 */
+	ADMUX &= 0X0E;	/* Clear first 5 bits in the ADMUX (channel number MUX4:0 bits) before set the required channel */
+	ADMUX = ADMUX | ch_num; /* Choose the correct channel by setting the channel number in MUX4:0 bits */
+
+	/*	 start conversion	*/
+	SET_BIT(ADCSRA,ADSC);
+
+	/*	 Polling	*/
+	while(BIT_IS_CLEAR(ADCSRA,ADIF)); 	/* Wait for conversion to complete, ADIF becomes '1' */
+
+	/*	clear the flag	*/
+	SET_BIT(ADCSRA,ADIF);
+
+
+	return ADC;	/*	return the value of ADC register that holds the converted value	*/
+}

LM 35 - Temperature Sensor/src/adc.h

@@ -0,0 +1,68 @@
+ /******************************************************************************
+ *
+ * Module: Analog to Digital Converter
+ * File Name: adc.h
+ * Description: header file for the ADC driver
+ * Author: Ibrahim Mohamed
+ *
+ *******************************************************************************/
+
+
+#ifndef SRC_ADC_H_
+#define SRC_ADC_H_
+
+#include "std_types.h"
+
+
+/*******************************************************************************
+ *                          Configurations	                                   *
+ *******************************************************************************/
+
+#define ADC_MAXIMUM_VALUE    1023
+#define ADC_REF_VOLT_VALUE   2.56
+
+/*******************************************************************************
+ *                         Types Declaration                                   *
+ *******************************************************************************/
+
+typedef enum{
+	AREF_OFF = 0,
+	AVCC = 1,
+	INTERNAL_VOLTAGE = 4
+} ADC_ReferenceVolatge;
+
+
+typedef enum{
+	F_CPU_2 = 0,
+	F_CPU_2 = 1,
+	F_CPU_4, F_CPU_8, F_CPU_16, F_CPU_32, F_CPU_64, F_CPU_128
+} ADC_Prescaler;
+
+
+typedef struct{
+	ADC_ReferenceVolatge ref_volt;
+	ADC_Prescaler prescaler;
+} ADC_ConfigType;
+
+
+/*******************************************************************************
+ *                             Functions Prototypes                            *
+ *******************************************************************************/
+
+
+/*
+ * Description :
+ * Initialize the ADC:
+ */
+void ADC_init(const ADC_ConfigType * Config_Ptr);
+
+
+
+/*
+ * Description :
+ * reads the channel from the ADC:
+ */
+uint16 ADC_readChannel(uint8 ch_num);
+
+
+#endif /* SRC_ADC_H_ */