MAX6953是紧凑的行共阴显示驱动器，通过IIC的串行接口将微控制器连接到5X7LED点阵屏。MAX6953可驱动多达4位单色或2位双色的5x7点阵屏，6953包含104个ASCII字符字模、复用扫描电路、行列驱动器以及用于存储每一们字符和24个用户自定义字符字模数据的静态RAM.LED的段电流由内部逐位数字亮度控制电跑设定。
本例运行时，4块点阵屏将流动显示一组信息串，字符由MAX6953提供。
Proteus运行截图：
Atmel Studio6.20编译通过截图：
程序清单：
- /*
- * GccApplication31.c
- *
- * Created: 2014-12-9 22:46:45
- * Author: Administrator
- */
- #define F_CPU 4000000UL
- #include <avr/io.h>
- #include <avr/interrupt.h>
- #include <util/twi.h>
- #include <util/delay.h>
- #include <string.h>
- #include <stdint.h>
- #define MAX6953R 0B10100001 //READ
- #define MAX6953W 0B10100000 //WRITE
- #define Wait() while((TWCR & _BV(TWINT))==0)
- #define START() {TWCR = _BV(TWINT)|_BV(TWSTA)|_BV(TWEN);Wait();}
- #define STOP() (TWCR = _BV(TWINT) | _BV(TWSTO)|_BV(TWEN))
- #define WriteByte(x) {TWDR = (x);TWCR = _BV(TWINT)|_BV(TWEN);Wait();}
- #define ACK() (TWCR |= _BV(TWEA))
- #define NACK() (TWCR &=~_BV(TWEA))
- char LED_String[] = "LEDSHOW: ddllxxrr ========0123456";
- uint8_t MAX6953_Write(uint8_t addr,uint8_t dat)
- {
- START();
- if(TW_STATUS != TW_START) return 0;
- WriteByte(MAX6953W);
- if(TW_STATUS != TW_MT_SLA_ACK) return 0;
- WriteByte(addr);
- if(TW_STATUS != TW_MT_DATA_ACK) return 0;
- WriteByte(dat);
- if(TW_STATUS != TW_MT_DATA_ACK)return 0;
- STOP();
- _delay_ms(2);
- return 1;
-
- }
-
- void MAX6953_INIT()
- {
- MAX6953_Write(0x01,0xFF);
- MAX6953_Write(0x02,0xFF);
- MAX6953_Write(0x03,0x03);
- MAX6953_Write(0x04,0x01);
- MAX6953_Write(0x07,0x00);
-
- }
- int main(void)
- {
- uint8_t i,j;
- DDRD = 0x00;PORTD = 0xFF;
- MCUCR = 0x02;
- GICR = 0x40;
- SREG = 0x80;
- MAX6953_INIT();
-
- while(1)
- {
- //TODO:: Please write your application code
- for(i=0;i<=strlen(LED_String) - 4;i++)
- {
- for(j=0;j<4;j++)
- MAX6953_Write(0x20 | j,(uint8_t)LED_String[i+j]);
- _delay_ms(300);
- }
- _delay_ms(2000);
- }
- }
- ISR(INT0_vect)
- {
- static uint8_t Shut_Down_6955 = 0x01;
- Shut_Down_6955 ^=0x01;
- MAX6953_Write(0x04,0x00 | Shut_Down_6955);
- }
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