max7219驱动（avr单片机）

/*********************************************************************************** Project: max7219 driver Prozessor: atmega128 family Compiler: winAVR Autor: a tao ***********************************************************************************/ #include <avr/io.h> #include <stdlib.h> #include "max7219.h" //FOR max7219 #define MOS_7219_CLR PORTF &= ~(1 << PF0) /*MOS置低电平*/ #define MOS_7219_SET PORTF |= (1 << PF0) /*MOS置高电平*/ #define S0_7219_CLR PORTF &= ~(1 << PF1) /*S0置低电平*/ #define S0_7219_SET PORTF |= (1 << PF1) /*S0置高电平*/ #define SCK_7219_CLR PORTB &= ~(1 << PB6) /*SCK置低电平*/ #define SCK_7219_SET PORTB |= (1 << PB6) /*SCK置高电平*/ #define S1_7219_CLR PORTD &= ~(1 << PD7) /*S1置低电平*/ #define S1_7219_SET PORTD |= (1 << PD7) /*S1置高电平*/ //两行led，显示参数，row1显示第一行，row2显示第二行 #define row1 0 #define row2 1 uint8_t led_row1[16]={0x01,0x01,0x02,0x02,0x03,0x03,0x04,0x04,0x05,0x05,0x06,0x06,0x07,0x07,0x08,0x08}; uint8_t led_row2[16]={0x01,0x7f,0x02,0xaa,0x03,0x0b,0x04,0x04,0x05,0x7f,0x06,0x06,0x07,0x07,0x08,0x82}; void delay_us(uint16_t u) //延时2us左右，delay(240)＝100us； { while(u) { u--; } } // inti max7219 void init7219() { DDRF |= (1 << PF0) ; /*设置输出*/ DDRF |= (1 << PF1) ; /*设置输出*/ DDRB |= (1 << PB6) ; /*设置输出*/ DDRD |= (1 << PD7) ; /*设置输出*/ //写控制字 //0xff,0xff进入display test模式;0xff,0x00进入normal operation模式;0x0c,0x01进入shutdown模式;0x0b,0x07扫描极限8;0x0a,0xf5 intensity;0x09,0xff选择译码模式 write_byte_7219(0x0c,0x01,row1); write_byte_7219(0x0f,0x00,row1); write_byte_7219(0x09,0x0ff,row1); write_byte_7219(0x0b,0x07,row1); write_byte_7219(0x0a,0x04,row1); write_byte_7219(0x0c,0x01,row2); write_byte_7219(0x0f,0x00,row2); write_byte_7219(0x09,0x0ff,row2); write_byte_7219(0x0b,0x07,row2); write_byte_7219(0x0a,0x04,row2); } void write_byte_7219(unsigned char address, unsigned char data,unsigned char indx) { unsigned char i; if(indx) //写第一排数码管 { S0_7219_CLR; for (i=0x80;i>0;i/=2) //shift bit for masking { SCK_7219_CLR; if (i & address) MOS_7219_SET; //masking value with i , write to SENSI-BUS else MOS_7219_CLR; SCK_7219_SET; //clk for SENSI-BUS delay_us(5); //pulswith approx. 5 us } for (i=0x80;i>0;i/=2) //shift bit for masking { SCK_7219_CLR; if (i & data) MOS_7219_SET; //masking value with i , write to SENSI-BUS else MOS_7219_CLR; SCK_7219_SET; //clk for SENSI-BUS delay_us(5); //pulswith approx. 5 us } S0_7219_SET; } else //写第二排数码管 { S1_7219_CLR; for (i=0x80;i>0;i/=2) //shift bit for masking { SCK_7219_CLR; if (i & address) MOS_7219_SET; //masking value with i , write to SENSI-BUS else MOS_7219_CLR; SCK_7219_SET; //clk for SENSI-BUS delay_us(5); //pulswith approx. 5 us } for (i=0x80;i>0;i/=2) //shift bit for masking { SCK_7219_CLR; if (i & data) MOS_7219_SET; //masking value with i , write to SENSI-BUS else MOS_7219_CLR; SCK_7219_SET; //clk for SENSI-BUS delay_us(5); //pulswith approx. 5 us } S1_7219_SET; } } void display_7219(unsigned indx) { uint8_t i; if(indx) { for(i=0;i<=15;i=i+2)//写入控制字 { write_byte_7219(led_row1[i],led_row1[i+1],indx); } } else { for(i=0;i<=15;i=i+2)//写入控制字 { write_byte_7219(led_row2[i],led_row2[i+1],indx); } } } //---------------------------------------------------------------------------------- int main(void) //---------------------------------------------------------------------------------- { init7219(); while(1) { display_7219(row1); display_7219(row2); for(int j=0;j<0xffff;j++) asm("NOP"); } return 0; }