FPGA中基于niosii的LCD1602显示代码.doc

FPGA 中基于nios ii 的LCD1602显示代码#includesystem.h#includealtera_avalon_pio_regs.h#includealtera_avalon_timer_regs.h#includealt_types.h#includesys/alt_irq.h#includesys/unistd.h#define uchar unsigned char#define uint unsigned intuint sec,min,hour;uint sec_up,sec_down,min_up,min_down,hour_up,hour_down;void write_data(uint data); /写数据void write_command(uchar command); /写指令void lcd1602_init(void); /初始化void updatetime(void);static void mytimer_isr_init(void); /初始化定时器中断int main(void) mytimer_isr_init(); while(1) lcd1602_init(); hour_up=hour/10;hour_down=hour%10; min_up=min/10;min_down=min%10; sec_up=sec/10;sec_down=sec%10; write_data(hour_up); write_data(hour_down); write_data(min_up); write_data(min_down); write_data(sec_up); write_data(sec_down); return 0;void write_data(uint data) uchar temp; switch(data) case 0:temp=0;break; case 1:temp=1;break; case 2:temp=2;break; case 3:temp=3;break; case 4:temp=4;break; case 5:temp=5;break; case 6:temp=6;break; case 7:temp=7;break; case 8:temp=8;break; case 9:temp=9;break; default:temp=0;break; usleep(1000); IOWR_ALTERA_AVALON_PIO_DATA( EN_BASE,0); IOWR_ALTERA_AVALON_PIO_DATA( RS_BASE,1); /RS为1时写数据 IOWR_ALTERA_AVALON_PIO_DATA( RW_BASE,0); usleep(1000); IOWR_ALTERA_AVALON_PIO_DATA( EN_BASE,1); IOWR_ALTERA_AVALON_PIO_DATA(LCD_DATA_BASE,temp); IOWR_ALTERA_AVALON_PIO_DATA( EN_BASE,0); /EN下降沿到来时写数据指令，若晶振速度太高可以在这后加小的延时void write_command(uchar command) usleep(1000); IOWR_ALTERA_AVALON_PIO_DATA( EN_BASE,0); IOWR_ALTERA_AVALON_PIO_DATA( RS_BASE,0); /RS为0时写指令 IOWR_ALTERA_AVALON_PIO_DATA( RW_BASE,0); usleep(1000); IOWR_ALTERA_AVALON_PIO_DATA( EN_BASE,1); IOWR_ALTERA_AVALON_PIO_DATA(LCD_DATA_BASE,command); /EN下降沿到来时写地址 IOWR_ALTERA_AVALON_PIO_DATA(EN_BASE,0);void lcd1602_init(void) write_command(0x02); write_command(0x04); write_command(0x0c); write_command(0x14); write_command(0x3c); write_command(0x01); write_command(0x80); /首行初址void updatetime(void) if(sec=60) sec=0; min+=1; if(min=60) min=0; hour+=1; if(hour=24) hour=0; static void timer_irq_handler(void *context, alt_u32 id) sec+; updatetime(); /清除Timer1中断标志寄存器 IOWR_ALTERA_AVALON_TIMER_STAUS(TIMER_BASE,0);static void timer_isr_init(void) /清除Timer1中断标志寄存器 IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_BASE, 0); /赋初值 IOWR_ALTERA_AVALON_TIMER_PERIODL(TIMER_BASE,50000000&0x0000ffff); IOWR_ALTERA_AVALON_TIMER_PERIODH(TIMER_BASE,5000000016); /注册Time