📄 zlg_avalon_lcd128_64.c
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/****************************************************************************
*名称: ST7920_CgramAddress
*功能: Set CGRAM address
*入口参数: CgramAddr
*说明: Base instruction
****************************************************************************/
void ST7920_CgramAddress(alt_u8 CgramAddr)
{
CgramAddr &= 0x3F;
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x02);
ST7920_SendCMD (0x30); //Base instruction
ST7920_SendCMD (CgramAddr|0x40);
}
/****************************************************************************
*名称: ST7920_DdramAddress
*功能: Set CGRAM address
*入口参数: DdramAddr
*说明: Base instruction
****************************************************************************/
void ST7920_DdramAddress(alt_u8 DdramAddr)
{
DdramAddr &= 0x3F;
ST7920_SendCMD (DdramAddr|0x80);//
}
//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
/****************************************************************************
*名称: ST7920_IdleMode
*功能: Idle mode enable
*说明: Expand instruction
****************************************************************************/
void ST7920_IdleMode(void)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x01);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_RollInstructionEnable
*功能: Roll instruction enable
*说明: Expand instruction
****************************************************************************/
void ST7920_RollInstructionEnable(void)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x03);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_RollInstructionDisable
*功能: Roll instruction Disable
*说明: Expand instruction
****************************************************************************/
void ST7920_RollInstructionDisable(void)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x02);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_IramAddress
*功能: Set Iram address
*说明: Expand instruction
****************************************************************************/
void ST7920_IramAddress(alt_u8 IramAddr)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x02);
ST7920_SendCMD (IramAddr|0x40);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_SetRollAddress
*功能: Roll instruction set address
*入口参数: WhichLine
*说明: Expand instruction
****************************************************************************/
void ST7920_SetRollAddress(alt_u8 WhichdotLine)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x03); //RollInstructionEnable
ST7920_SendCMD (WhichdotLine|0x40);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_NegativeDisplay
*功能: Negative dispaly
*入口参数:
*说明: Expand instruction
****************************************************************************/
void ST7920_NegativeDisplay(alt_u8 row,alt_u8 col,alt_u8 width)
{
alt_u8 x,y;
alt_u8 i,j;
row = row&0x03;
y = (row&0x01)<<4;
x = row>1?col+8:col;
for(i=0; i<16; i++)
{ //vertical setting
ST7920_SendCMD (0x34);
ST7920_SendCMD (0x80|y);
y++;
//horizontal setting
ST7920_SendCMD (0x80|x);
ST7920_SendCMD (0x30);
for(j=0;j<width;j++)
ST7920_SendDATA(0xff);
}
ST7920_PictureOn();
}
/****************************************************************************
*名称: ST7920_CancelNegDisp
*功能: Cancel Negative dispaly
*入口参数:
*说明: Expand instruction
****************************************************************************/
void ST7920_CancelNegDisp(alt_u8 row,alt_u8 col,alt_u8 width)
{
alt_u8 x,y;
alt_u8 i,j;
row = row&0x03;
y = (row&0x01)<<4;
x = row>1?col+8:col;
for(i=0; i<16; i++)
{ //vertical setting
ST7920_SendCMD (0x34);
ST7920_SendCMD (0x80|y);
y++;
//horizontal setting
ST7920_SendCMD (0x80|x);
ST7920_SendCMD (0x30);
for(j=0;j<width;j++)
ST7920_SendDATA(0x00);
}
ST7920_PictureOn();
}
/****************************************************************************
*名称: ST7920_ClearGDRAM
*功能: Clear Gdram
*入口参数:
*说明: Expand instruction
****************************************************************************/
void ST7920_ClearGDRAM(void)
{
alt_u8 i,j;
for(i=0; i<32; i++)
{ //vertical setting
ST7920_SendCMD (0x34);
ST7920_SendCMD (0x80|i);
//horizontal setting
ST7920_SendCMD (0x80);
ST7920_SendCMD (0x30);
for(j=0;j<16;j++)
ST7920_SendDATA(0x00);
}
for(i=0; i<32; i++)
{ //vertical setting
ST7920_SendCMD (0x34);
ST7920_SendCMD (0x80|i);
//horizontal setting
ST7920_SendCMD (0x80|8);
ST7920_SendCMD (0x30);
for(j=0;j<16;j++)
ST7920_SendDATA(0x00);
}
}
/****************************************************************************
*名称: ST7920_Sleep
*功能: get to sleep
*说明: Expand instruction
****************************************************************************/
void ST7920_Sleep(void)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x08);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_WakeUp
*功能: screen wake up!
*说明: Expand instruction
****************************************************************************/
void ST7920_WakeUp(void)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x0c);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_PictureOn
*功能: Open the picture to screen
*说明: Expand instruction
****************************************************************************/
void ST7920_PictureOn(void)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x36);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_PictureOff
*功能: Close the picture of screen
*说明: Expand instruction
****************************************************************************/
void ST7920_PictureOff(void)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (0x30);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: ST7920_GdramAddress
*功能: Set GDRAM to AC,setup it's address about V or H
*入口参数: VerticalAddr,HorizontalAddr
*说明: Expand instruction
****************************************************************************/
void ST7920_GdramAddress(alt_u8 VerticalAddr,alt_u8 HorizontalAddr)
{
ST7920_SendCMD (0x34); //Expand instruction
ST7920_SendCMD (VerticalAddr|0x80);
ST7920_SendCMD (HorizontalAddr|0x80);
ST7920_SendCMD (0x30); //Base instruction
}
/****************************************************************************
*名称: LCD_init
*功能: initialize the LCD
*入口参数: None
*说明:
****************************************************************************/
void LCD_init(void)
{
//DelayNmS(40);
alt_busy_sleep(40000);//Delay 40ms
//*LCD_WRITE_COMMAND = 0x30;
LCD_WRITE_COMMAND(0x30);
//DelayNmS(10);
alt_busy_sleep(10000);//Delay 10ms
//*LCD_WRITE_COMMAND = 0x30;
LCD_WRITE_COMMAND(0x30);
//DelayNmS(5);
alt_busy_sleep(5000);//Delay 5ms
//*LCD_WRITE_COMMAND = 0x30;
LCD_WRITE_COMMAND(0x30);
ST7920_SendCMD(LCD_CMD_8BIT);
ST7920_SendCMD(LCD_CMD_DISP_ON);
ST7920_SendCMD(LCD_CMD_CLEAR);
ST7920_SendCMD(LCD_CMD_AC_INC);
}
/****************************************************************************
*名称: LCD_printf
*功能: 在指定位置显示指定长度的字符
*入口参数: row ：列位置0-7
col ：行位置0-3
*pdata: 显示数据缓冲区
len ：显示字符长度 0-64 一个汉字为2个字符
*说明: 支持中英文混合显示，支持自动换行,地址为双字节长度自增。
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
ST7920最多可驱动256X64点阵的LCD，市面上很多128X64的LCD也用7920驱动。这些
12864的屏幕是把ST7920所驱动的上面一半256*32点阵取出使用的，这个区域被分割成
左右两半各128*32点，将右面一半折到下面去了。以其DDRAM汉字显示地址排列说明：
ST7920的16*4汉字地址如下：
80,81,82,83,84,85,86,87,88,89,8A,8B,8C,8D,8E,8F
90,91,92,93,94,95,96,97,98,99,9A,9B,9C,9D,9E,9F
A0,A1,A2,A3,A4,A5,A6,A7,A8,A9,AA,AB,AC,AD,AE,AF
B0,B1,B2,B3,B4,B5,B6,B7,B8,B9,BA,BB,BC,BD,BE,BF
市售12864屏幕的汉字地址如下：
80,81,82,83,84,85,86,87
90,91,92,93,94,95,96,97
88,89,8A,8B,8C,8D,8E,8F
98,99,9A,9B,9C,9D,9E,9F
因此编程时要通过查表进行相应的变换。
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****************************************************************************/
int LCD_printf(alt_u8 row,alt_u8 col,alt_u8 *pdata,alt_u8 len)
{
int ret_code;
if(len>64) //最多显示64个字符，超出部分忽略
len = 64;
row = row&0x03;
col = col&0x07;
while(len!=0)
{
ST7920_DdramAddress(DDRAMaddr[row][col]);//进行行调换
for(;col<16&&len!=0;col++)
{
ret_code = ST7920_SendDATA(*pdata++);
if(ret_code == LCD_ERR_TIMEOUT)
return ret_code;
len--;
}
row++;
row = row&0x03;
col = 0;
}
return LCD_ERR_OK;
}
/****************************************************************************
*名称: LCD_PlotPic
*功能: 显示图形128*64点阵。
*入口参数: *pdata 图形128*64点阵缓冲区指针
****************************************************************************/
void LCD_PlotPic(alt_u8 *pdata)
{
alt_u8 i,j;
//ST7920_PictureOff();
for(i=0; i<32; i++)
{ //vertical setting
ST7920_SendCMD(0x34);
ST7920_SendCMD(0x80|i);
//horizontal setting
ST7920_SendCMD(0x80);
ST7920_SendCMD(0x30);
for(j=0;j<16;j++)
ST7920_SendDATA(*pdata++);
}
for(i=0; i<32; i++)
{ //vertical setting
ST7920_SendCMD(0x34);
ST7920_SendCMD(0x80|i);
//horizontal setting
ST7920_SendCMD(0x80|8);
ST7920_SendCMD(0x30);
for(j=0;j<16;j++)
ST7920_SendDATA(*pdata++);
}
ST7920_PictureOn();
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