/*
*****************************************************************************
*
* File Name - adc.c
* Function - Reads the voltage on each of the uFlash ADC pins prints the
* voltage out each second,
*
* You will need:
* (1) uFlash & & CCS PIC C Compiler (PCM/PCW)
* (2) PC Terminal emulator (such as Hyperterm)
*
* Instructions:
* (1) Compile & downloading to the uFlash
* (2) Setup Hyprterm for 57K6 Baud,8 bits, no parity, no echo, no handshaking
* (3) Remove the Pgrm Jumper from the uFlash (this stops Hyperterm from
* holding the uFlash in reset).
* (4) Run Hyperterm
* (5) Put voltages of between 0 and 5V on pins P4,P5,P6 & P7 & observe readout
*
*****************************************************************************
*/
#include <uF876.h>

void init_hardware(void);
float read_voltage(BYTE ch);

/*
******************************** main ***************************************
*/

void main(void)
	{
	init_hardware();				// set up the adc port
	while(TRUE)					// loop forever
		{
		printf("%1.2f,",read_voltage(0));	// print each of the voltages
		printf("%1.2f,",read_voltage(1));
		printf("%1.2f,",read_voltage(2));
		printf("%1.2f\r",read_voltage(3));
		delay_ms(1000);				// delay 1 sec
		}
	}

/*
************************** init_hardware ************************************
*
*	Sets up the uFlash ADC port
*/

void init_hardware(void)
	{
	setup_adc(ADC_CLOCK_DIV_32);
	setup_adc_ports(ALL_ANALOG);
	}

/*
************************** read_voltage ************************************
*
*	Reads the adc value on a specified port and returns it scaled
*	as a voltage.
*/

float read_voltage(BYTE ch)
	{
	float v;			// the voltage on the channel

	set_adc_channel(ch);		// select the required channel
	delay_us(500);			// allow to settle
	v=read_adc();			// read the raw adc value
	v*=(5.0/1024.0);		// scale to a voltage

	return v;			// return the voltage
	}