关于LCD12864（ST7920）和扩展板dvk511的一个问题
买了一个DVK511扩展板，相接12864显示器，但是扩展板自带的例程都跑不起来，请大家帮我看看，多谢了！扩展板地址：
http://item.taobao.com/item.htm?id=26424216746
lcd12864.c：
/*
define from bcm2835.h define from Board DVK511
3.3V | | 5V -> 3.3V | | 5V
RPI_V2_GPIO_P1_03 | | 5V -> SDA | | 5V
RPI_V2_GPIO_P1_05 | | GND -> SCL | | GND
RPI_GPIO_P1_07 | | RPI_GPIO_P1_08 -> IO7 | | TX
GND | | RPI_GPIO_P1_10 -> GND | | RX
RPI_GPIO_P1_11 | | RPI_GPIO_P1_12 -> IO0 | | IO1
RPI_V2_GPIO_P1_13 | | GND -> IO2 | | GND
RPI_GPIO_P1_15 | | RPI_GPIO_P1_16 -> IO3 | | IO4
VCC | | RPI_GPIO_P1_18 -> VCC | | IO5
RPI_GPIO_P1_19 | | GND -> MOSI | | GND
RPI_GPIO_P1_21 | | RPI_GPIO_P1_22 -> MISO | | IO6
RPI_GPIO_P1_23 | | RPI_GPIO_P1_24 -> SCK | | CE0
GND | | RPI_GPIO_P1_26 -> GND | | CE1
::if your raspberry Pi is version 1 or rev 1 or rev A
RPI_V2_GPIO_P1_03->RPI_GPIO_P1_03
RPI_V2_GPIO_P1_05->RPI_GPIO_P1_05
RPI_V2_GPIO_P1_13->RPI_GPIO_P1_13
::
*/
#include <bcm2835.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
void lcdint(void);
void sendcode(unsigned char code);
void senddata(unsigned char data);
void hexToAscii(unsigned char* str,unsigned int hex,unsigned char width);
void decToAscii(unsigned char* str,unsigned int dec,unsigned char width);
void refreshlcd(const unsigned char *lcdstack);
void showLine(const unsigned char x,const unsigned char y,unsigned char* lcd_stack,unsigned char * str,...);
#define CS RPI_GPIO_P1_15
char lcd_buffer;
int main(int argc, char **argv)
{
unsigned char num,i;
if (!bcm2835_init())
return 1;
bcm2835_spi_begin();
bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST); // The default
bcm2835_spi_setDataMode(BCM2835_SPI_MODE3); // The default
bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_256); // The default
bcm2835_gpio_fsel(CS, BCM2835_GPIO_FSEL_OUTP);//bcm2835_spi_chipSelect(BCM2835_SPI_CS0);
bcm2835_gpio_write(CS, HIGH);
printf("spi-lcd12864 :\n Start .......\n");
lcdint();
// "1234567890123456"
showLine(0,0,lcd_buffer," waveshare ");
showLine(0,1,lcd_buffer," welcome ");
showLine(0,2,lcd_buffer," DVK511 ");
showLine(0,3,lcd_buffer," raspberryPi");
refreshlcd(lcd_buffer);
while(1);
bcm2835_delay(10000);
// sendcode(0x01);//off the lcd ,if you don't want to off the lcd ,you can cancel the code
printf("\n.......now the lcd12864 had closed the show............\n");
bcm2835_spi_transfer(0xf8);bcm2835_spi_end();
bcm2835_close();
return 0;
}
void lcdint(void)
{
bcm2835_gpio_write(CS, HIGH);
sendcode(0X0C);
sendcode(0X01);
bcm2835_delay(2);
memset(lcd_buffer,0,sizeof(lcd_buffer));
}
void refreshlcd(const unsigned char *lcd_stack)
{
unsigned char addr;
sendcode(0X02);
for(addr=0;addr < 16;addr++)
{
senddata(*(lcd_stack + addr));
}
for(addr=32;addr < 48;addr++)
{
senddata(*(lcd_stack + addr));
}
for(addr=16;addr < 32;addr++)
{
senddata(*(lcd_stack + addr));
}
for(addr=48;addr < 64;addr++)
{
senddata(*(lcd_stack + addr));
}
}
void showLine(const unsigned char x,const unsigned char y,unsigned char* lcd_stack,unsigned char * str,...)
{
unsigned char coordinate = 16*y + x;
va_list marker;
va_start(marker,str); /* Initialize variable arguments. */
while(*str!='\0')
{
if(coordinate>64) break; /*·ÀÖ¹¶ÑÕ»Òç³ö*/
if(*str == '\\')
{
str++;
lcd_stack = *str;
}
else if(*str == '%')
{
str++;
if (*str=='d'||*str=='D')
{
str++;
decToAscii(&lcd_stack,va_arg(marker,unsigned int),(*str-'0'));
coordinate+=(*str-'0'-1);
}
else if(*str=='c'||*str=='C')
{
lcd_stack = va_arg(marker,unsigned int);
}
else if(*str=='x'||*str=='X')
{
str++;
hexToAscii(&lcd_stack,va_arg(marker,unsigned int),(*str-'0'));
coordinate+=(*str-'0'-1);
}
}
else
{
lcd_stack = *str;
}
str++;
coordinate++;
}
va_end( marker ); /* Reset variable arguments. */
}
void sendcode(unsigned char code)
{
bcm2835_spi_transfer(0xf8);
bcm2835_spi_transfer(code&0xf0);
bcm2835_spi_transfer(code<<4);
bcm2835_delayMicroseconds(75);
}
void senddata(unsigned char data)
{
bcm2835_spi_transfer(0xFA);
bcm2835_spi_transfer(data & 0xF0);
bcm2835_spi_transfer((data<<4));
bcm2835_delayMicroseconds(75);
}
void decToAscii(unsigned char* str,unsigned int dec,unsigned char width)
{
while(width)
{
switch(width)
{
case 5:
{
*str = (dec/10000+'0');
dec%=10000;
break;
}
case 4:
{
*str = (dec/1000+'0');
dec%=1000;
break;
}
case 3:
{
*str = (dec/100+'0');
dec%=100;
break;
}
case 2:
{
*str = (dec/10+'0');
dec%=10;
break;
}
case 1:
{
*str = (dec+'0');
break;
}
default: *str = '0';
}
width--;
str++;
}
}
void hexToAscii(unsigned char* str,unsigned int hex,unsigned char width)
{
unsigned int tmp;
while(width)
{
switch(width)
{
case 4:
{
tmp=(hex>>12);
if(tmp>9) *str = tmp+('A'-10);
else *str = tmp+'0';
break;
}
case 3:
{
tmp=(hex>>8)&0x000F;
if(tmp>9) *str = tmp+('A'-10);
else *str = tmp+'0';
break;
}
case 2:
{
tmp=(hex>>4)&0x000F;
if(tmp>9) *str = tmp+('A'-10);
else *str = tmp+'0';
break;
}
case 1:
{
tmp=hex&0x000F;
if(tmp>9) *str = tmp+('A'-10);
else *str = tmp+'0';
break;
}
default: *str = '0';
}
width--;
str++;
}
}
lcd12863液晶地址：
http://trade.taobao.com/trade/detail/tradeSnap.htm?spm=a1z09.2.9.7.oDwaBC&tradeID=543875927233397
现状是背光可以亮，但是显示不了示例文字，求指导，多谢！
有人吗知道吗？ 我的这个板子也刚刚到手，昨天测试，12864LCD显示英文正常，显示中文有问题。用的就是dvk511板子自带的实例程序 佛缘 发表于 2014-4-6 00:19 static/image/common/back.gif
我的这个板子也刚刚到手，昨天测试，12864LCD显示英文正常，显示中文有问题。用的就是dvk511板子自带的实例 ...
请问你的LCD是3.3v还是5v？我用的是5v的。 我是3.3V的
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