1-Riadková kamera TSLR1401: Rozdiel medzi revíziami

#ifndef KAMERA_H_
#define KAMERA_H_

#define CLK_PORT	B
#define CLK_PIN		5

#define SI_PORT		B
#define SI_PIN		4

#define A0_PORT		C
#define A0_PIN		0

#endif /* KAMERA_H_ */

#include <stdio.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "kamera.h"


/* Global macros */
#define sbit(var, bit)	var |= (1 << bit);
#define cbit(var, bit)	var &= ~(1 << bit);
#define rbit(var, bit)	((var & (1 << bit)) != 0)
#define CONCAT(a, b)	a ## b
#define DDR(port)		CONCAT(DDR, port)
#define INPORT(port)	CONCAT(PIN, port)
#define OUTPORT(port)	CONCAT(PORT, port)


/* Program-specific macros */
#define cam_clk_high()	sbit(OUTPORT(CLK_PORT), CLK_PIN)
#define cam_clk_low()	cbit(OUTPORT(CLK_PORT), CLK_PIN)
#define cam_si_high()	sbit(OUTPORT(SI_PORT), SI_PIN)
#define cam_si_low()	cbit(OUTPORT(SI_PORT), SI_PIN)

static int usart_putchar(char c, FILE *stream);
static FILE mystdout = FDEV_SETUP_STREAM(usart_putchar, NULL, _FDEV_SETUP_WRITE);

/* Global variables */
volatile unsigned char _integrationTime = 10;	// in milliseconds
unsigned char _data[128];

// Send char over USART
static int usart_putchar(char c, FILE *stream) {
    // add '\r' before '\n'
	//if (c == '\n') usart_putchar('\r', stream);
	// wait for empty transmit buffer
	while ( !(UCSR0A & (1 << UDRE0)) );
	// send char
	UDR0 = c;
	return 0;
}


// Send char over USART
void usart_send_char(unsigned char ch) {
	// wait for empty transmit buffer
	while ( !(UCSR0A & (1 << UDRE0)) );
	// send char
	UDR0 = ch;
}

// Read the 8 most significant bits
// of the AD conversion result
unsigned char read_adc() {
	// Start the AD conversion
	ADCSRA |= (1 << ADSC);
	// Wait for the AD conversion to complete
	while ((ADCSRA & (1 << ADIF)) == 0);
	// Clear flag
	ADCSRA |= (1 << ADIF);
	return ADCH;
}

// RX Complete handler
ISR (USART_RX_vect) {

	// received character is set as integration time in [ms], max 100
	unsigned char ch;
	ch = UDR0;
	if (ch > 100) ch = 100;

	_integrationTime = ch;
}


// Main loop
int main(void)
{
	// Pin config
	sbit(DDR(CLK_PORT), CLK_PIN);	// CLK out
	sbit(DDR(SI_PORT), SI_PIN);		// SI out
	cbit(DDR(A0_PORT), A0_PIN);		// analog in


	// Configure UART
	// - parameters: 8 Data, 1 Stop, No Parity
	// - baud rate: 19200
	UCSR0B = (1 << RXCIE0) | (1 << RXEN0) | (1 << TXEN0);
	UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
	UBRR0 = 51;	// @16MHz, 0.2% error


	// ADC initialization
	// - ADC clock frequency: F_CPU / 128 (125kHz @ 16MHz)
	// - reference: AVcc with external cap
	// - channel: as defined in A0_PIN
	// - result left adjusted!
	ADMUX = (1 << REFS0) | (1 << ADLAR) | A0_PIN;
	ADCSRA = (1 << ADEN) | (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);

    // Redirect STDOUT to USART
	stdout = &mystdout;

	// Interrupt global enable
	sei();

	// Init StampPlot
	printf("!PNTS 128\r");
	printf("!PLOT ON\r");
	printf("!MAXR\r");
	printf("!AMAX 255\r");
	printf("!TMAX 1\r");
	printf("!RSET\r");

	// some delay for PC port buffers to clear
	_delay_ms(500);

	// time to send
	unsigned char tts = 0;
    while(1)
    {
        cam_si_high();
		cam_clk_high();
		cam_si_low();

		unsigned char i;
		for (i = 0; i < 128; i++)
		{
			cam_clk_low();
			unsigned char val = read_adc();
			_data[i] = val;
			cam_clk_high();
		}
		cam_clk_low();

		// delay for integration time
		for (i = 0; i < _integrationTime; i++) _delay_ms(1);

		// send data
		if (tts++ == 10)
		{
			tts = 0;
			// data send lasts ~150ms
			for (i = 0; i < 128; i++) printf("%d\r", _data[i]);
		}

    }
}