74HC595是串转并芯片。它的特点是锁存数据，所以用它来驱动LED没有闪炼感。
以下是Proteus运行的载图：
Stduio6.2编译通过的结果。
程序清单：
- /*
- * GccApplication18.c
- *
- * Created: 2014-11-17 21:03:06
- * Author: Administrator
- */
- #define F_CPU 1000000UL
- #include <avr/io.h>
- #include <util/delay.h>
- #include <stdint.h>
- //管脚定义
- #define SH_CP PC0
- #define DS PC1
- #define SP_CP PC3
- #define SH_CP_0() PORTC &= ~_BV(SH_CP)
- #define SH_CP_1() PORTC |= _BV(SH_CP)
- #define DS_0() PORTC &= ~_BV(DS)
- #define DS_1() PORTC |=_BV(DS)
- #define ST_CP_0() PORTC &=~_BV(SP_CP)
- #define ST_CP_1() PORTC |= _BV(SP_CP)
- const uint8_t SEG_CODE[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
- void Serial_Input_595(uint8_t dat)
- {
- uint8_t i;
- for(i = 0;i<8;i++)
- {
- if(dat & 0x80) DS_1(); else DS_0();
- dat <<= i;
- SH_CP_0(); _delay_us(2);
- SH_CP_1(); _delay_us(2);
- SH_CP_0(); _delay_us(2);
-
- }
- }
- void Paraller_Output_595()
- {
- ST_CP_0(); _delay_us(1);
- ST_CP_1(); _delay_us(1);
- ST_CP_0(); _delay_us(1);
- }
- int main(void)
- {
- uint8_t i=0;
- DDRC = 0xFF;
- while(1)
- {
- for(i = 0;i<10;i++)
- {
- Serial_Input_595(SEG_CODE[i]);
- Paraller_Output_595();
- _delay_ms(300);
- }
- //TODO:: Please write your application code
- }
- }
| 
楼主
