main.c

利用单片制作信号发生器

#include "hardware.h"
#include "LCD1602.h"
extern void (enable_timer1)();
extern void (enable_timer0)();
extern void (init_LCD1602)();

extern bit	cur_signal;
extern unsigned int data freq;

/* 方波占空比 */
extern unsigned char data time_high, time_low;

/* 与方波频率相关 */
extern unsigned char data rect_high_TH0;
extern unsigned char data rect_high_TL0;
extern unsigned char data rect_low_TH0;
extern unsigned char data rect_low_TL0;

/* 正弦频率相关 */
extern unsigned char data sin_TH0;
extern unsigned char data sin_TL0;

/* 与幅度相关 */
extern unsigned char data range_low, range_high;
extern float data proportion; /* 幅度与DAC量程之比 */ 

extern mdelay(unsigned int);
void main()
{
	unsigned int count;
	//	unsigned char dec_bit;
	//char rect_line1[] = "F  DR:5/5#";
	cur_signal = SIG_RECT;
	freq = 500;
	range_high = 0xff;
	range_low = 0x00;
	time_high = 1;
	time_low = 1;

	proportion = (float)(range_high - range_low) / 0xff;
	
	count = (HZ * time_high) / (freq * 12 * (time_high + time_low)) * 1000000;
	rect_high_TL0 = (unsigned char) count; 
	rect_high_TH0 = count >> 8;

	count = (HZ * time_low) / (freq * 12 * (time_high + time_low)) * 1000000;
	rect_low_TL0 = (unsigned char) count; 
	rect_low_TH0 = count >> 8;
	
	count = (HZ / (12 * 256 * freq)) * 1000000;
	sin_TL0 = (unsigned char) count;
	sin_TH0 = count >> 8;

	init_LCD1602();
	//if( cur_signal == SIG_RECT)
	//	print_line(0, 10, "F  DR:5/5#");
	//else //cur_signal == SIG_SIN
	//	print_line(0, 10, "Z 0.5-5.0v");  
	
	enable_timer0();
	enable_timer1();
	
	printstr(0x0, 0xf, "SignalGenerator");
	printstr(0x40, 0x4f, "program running!");
	mdelay(1000);
	LCD_write_cmd(0x01);
	//print : program running
	
	printstr(0xa, 0xf, "0500HZ");
	
	while (1) {
		if (cur_signal == SIG_RECT) {
			printstr(0x0, 0x3, "F DR");
			LCD_write_data(0, 4, time_high + 0x30);
			LCD_write_data(0, 5, 'H');
			LCD_write_data(0, 6, time_low + 0x30);
			LCD_write_data(0, 7, 'L');
			LCD_write_data(0, 8, ' ');
			LCD_write_data(0, 9, ' ');
			printstr(0x40, 0x4f, "SET DR: 5L  6H ");
		} else {// 正弦波
			LCD_write_data(0, 0, 'Z');
			LCD_write_data(0, 1, ' ');

			/* range_low / 50 + 0x30;将256个阶分为25份，每份10， 
			 * 对于Vref为5V的情况，10近似地代表0.2V 
			 * 50近似代表1V, 所以这里的dec_bit表示幅度的整数部分
			 */
			LCD_write_data(0, 2, range_low / 50 + 0x30);	
			LCD_write_data(0, 3, '.');
			LCD_write_data(0, 4, ((range_low / 5) % 10) + 0x30);
			// (range_low / 5) % 10 + 0x30;range_low /5 表示0。1V的个数, %10 取个位数
			
			LCD_write_data(0, 5, '-');
			
			LCD_write_data(0, 6, range_high / 50 + 0x30);	
			LCD_write_data(0, 7, '.');
			LCD_write_data(0, 8, (range_high / 5) % 10  + 0x30);
			LCD_write_data(0, 9, 'V');
			
			printstr(0x40, 0x4f, "mod:5 trg,6 crst");   
			//LCD_write_data(0, 4, (unsigned char)
		}
	}
}