//==============================
//读取三个屏中其中一个的存储区数据;
//==============================
unsigned char ReadData(unsigned char chipselect)
{
unsigned char backdat=0;
if(chipselect=='L')
while(ReadBusy('L')); //read busy,if busy stay here;
if(chipselect=='M')
while(ReadBusy('M'));
if(chipselect=='R')
while(ReadBusy('R'));
DataDir=0x00;
ComBus |= EN;
ComBus &= ~EN;
_delay_us(10);
ComBus |= RW;
ComBus |= RS;
if(chipselect=='L')
ComBus &= ~ChipCS1;
if(chipselect=='M')
ComBus &= ~ChipCS2;
if(chipselect=='R')
ComBus &= ~ChipCS3;
ComBus |= EN;
_delay_us(20);
backdat = DataPin;
ComBus &= ~EN;
ComBus |= (ChipCS1|ChipCS2|ChipCS3);
return(backdat);
}
//===========================================
//选择向三个屏中一个写入数据;
//===========================================
void WriteData(const unsigned char dat,unsigned char chipselect)
{
if(chipselect=='L')
while(ReadBusy('L')); //read busy,if busy stay here;
if(chipselect=='M')
while(ReadBusy('M'));
if(chipselect=='R')
while(ReadBusy('R'));
DataDir=0xff;
ComBus |= EN;
ComBus &= ~EN;
_delay_us(10);
ComBus &= ~RW;
ComBus |= RS;
if(chipselect=='L')
ComBus &= ~ChipCS1;
if(chipselect=='M')
ComBus &= ~ChipCS2;
if(chipselect=='R')
ComBus &= ~ChipCS3;
DataBus = dat;
ComBus |= EN;
_delay_us(20); //delay
ComBus &= ~EN;
ComBus |= (ChipCS1|ChipCS2|ChipCS3);
}
/*********************************************
功能：写显示buffer
参数： XSize x方向数量 128点方向，调整为8的整数倍
YSize y方向数量
Dispbuff 显示数据保存位置。 要求数据的排列方式必须正确
*********************************************/
static void EPD_W21_WriteDispRam(unsigned char XSize, unsigned int YSize,
unsigned char *Dispbuff) {
int i = 0, j = 0;
if (XSize % 8 != 0) {
XSize = XSize + (8 - XSize % 8);
}
XSize = XSize / 8;
//while(isEPD_W21_BUSY == 1); //wait
ReadBusy();
EPD_W21_CS_0;
EPD_W21_DC_0; //command write
SPI_Write(0x24);
EPD_W21_DC_1; //data write
for (i = 0; i < YSize; i++) {
for (j = 0; j < XSize; j++) {
SPI_Write(*Dispbuff);
Dispbuff++;
}
}
EPD_W21_CS_1;
}
/*-------------------------------------------------------*/
static void EPD_W21_WriteCMD_p1(unsigned char command, unsigned char para) {
//while(isEPD_W21_BUSY == 1); // wait
ReadBusy();
EPD_W21_CS_0;
EPD_W21_DC_0; // command write
SPI_Write(command);
EPD_W21_DC_1; // command write
SPI_Write(para);
EPD_W21_CS_1;
}
