dotled.c

16 16点阵显示汉字原理及显示程序

#include "config.h"

#define		DOTLED_LINE_PORT	PORTB
#define		DOTLED_LINE_DDR		DDRB
#define		DOTLED_LINE_PIN		PINB

#define		DOTLED_LINE_SCKT	PB1
#define		DOTLED_LINE_SCKH	PB5
#define		DOTLED_LINE_SDA		PB3

#define		DOTLED_ROW_PORT		PORTC
#define		DOTLED_ROW_DDR		DDRC
#define		DOTLED_ROW_PIN		PINC

#define		DOTLED_ROW_A0		PC0
#define		DOTLED_ROW_A1		PC1
#define		DOTLED_ROW_A2		PC2
#define		DOTLED_ROW_A3		PC3
#define		DOTLED_ROW_E		PC4



uint8 font[] = {
/*--  调入了一幅图像：这是您新建的图像  --*/
/*--  宽度x高度=16x16  --*/
0x00,0x00,0x00,0x00,0x08,0x38,0x18,0x44,0x08,0x44,0x08,0x04,0x08,0x08,0x08,0x10,
0x08,0x20,0x08,0x40,0x08,0x40,0x08,0x40,0x3E,0x7C,0x00,0x00,0x00,0x00,0x00,0x00
};



static void TransmitByte(uint8 byte);
static void SelectRow(uint8 row);
static void FlipLatchLine(void);


static void TransmitByte(uint8 byte)
{
	uint8 i;
	
	for(i = 0 ; i < 8 ; i ++)
	{
		if(byte & (1 << i))
		{
			DOTLED_LINE_PORT |= _BV(DOTLED_LINE_SDA);
		}
		else
		{
			DOTLED_LINE_PORT &= ~_BV(DOTLED_LINE_SDA);
		}
		//__delay_cycles(100);
		DOTLED_LINE_PORT |= _BV(DOTLED_LINE_SCKH);
		//__delay_cycles(100);
		DOTLED_LINE_PORT &= ~_BV(DOTLED_LINE_SCKH);
		//__delay_cycles(100);
	}
}

static void SelectRow(uint8 row)
{
  	//row -= 1;
	row |= DOTLED_ROW_PIN & 0xe0;
	DOTLED_ROW_PORT = row;
}

static void FlipLatchLine(void)
{
	DOTLED_LINE_PORT |= _BV(DOTLED_LINE_SCKT);
	DOTLED_LINE_PORT &= ~_BV(DOTLED_LINE_SCKT);
}

void InitDotLedPort(void)
{
	DOTLED_LINE_PORT &= ~(_BV(DOTLED_LINE_SCKT) | _BV(DOTLED_LINE_SCKH));
	DOTLED_LINE_PORT |= _BV(DOTLED_LINE_SDA);
	DOTLED_LINE_DDR |= _BV(DOTLED_LINE_SCKT) | _BV(DOTLED_LINE_SCKH) | _BV(DOTLED_LINE_SDA);
	
	DOTLED_ROW_PORT |= 0x1f;
	DOTLED_ROW_PORT &= 0xf0;
	DOTLED_ROW_DDR |= 0x1f;
}
void EnableRow(boolean IsEnable)
{
	if(IsEnable)
	{
		DOTLED_ROW_PORT &= ~_BV(DOTLED_ROW_E);
	}
	else
	{
		DOTLED_ROW_PORT |= _BV(DOTLED_ROW_E);
	}
}
void PrintDotLed(uint8 * buffer)
{
	uint8 i , tmp;
	
	for(i = 0 ; i < 16 ; i ++)
	{
		tmp = *buffer ++;
		TransmitByte(~tmp);
		tmp = *buffer ++;
		TransmitByte(~tmp);
		SelectRow(i);
		FlipLatchLine();
	}
}
void main(void)
{
	InitDotLedPort();
	
	EnableRow(TRUE);
	
	while(1)
	{
		PrintDotLed(font);
		__delay_cycles(5000);
	}
	
}