/**
* Waits until busy flag of LCD is cleared
*/
static void lcdBusyWait() {
LCD_RW(1);
LCD_RS(0);
LCD_DATA_DDR = 0x00; /* input */
delay_us(LCD_DELAY_SHORT); /* RS, RW Setup Time (Minimum: 60ns) */
lcdToggleEn();
loop_until_bit_is_clear(LCD_DATA_PIN,LCD_BUSY_FLAG);
lcdToggleEn();
}
/**
* Writes instructions to the LCD
*
* Inputs: db LCD instruction
* rs for commands, rs = 0
* for sending data, rs = 1
*/
static void lcdWrite(BYTE db, BYTE rs) {
lcdBusyWait();
LCD_RW(0);
LCD_RS(rs);
LCD_DATA_DDR = 0xFF; /* output */
LCD_DATA_PORT = db;
delay_us(LCD_DELAY_EN); /* RS, RW Setup Time (Minimum: 60ns) */
lcdToggleEn();
}
static void SendStartByte( unsigned char RW, unsigned char RS)
{
#define LCD_DEV_ID(v) (v<<2)
#define LCD_RS(v) (v<<1)
#define LCD_RW(v) (v<<0)
unsigned char StartByte = 0x70;
StartByte |= (LCD_DEV_ID(0) | LCD_RS(RS) | LCD_RW(RW));
SendByte( StartByte);
}
//写指令
void WriteCommandLCD(unsigned char WCLCD) //BuysC为0时忽略忙检测
{
ReadStatusLCD(); //根据需要检测忙
LCD_RS(0);
LCD_RW(0);
LCD_EN(0);
Delay_us(1);
LCD_WriteData(WCLCD);
LCD_EN(1);
Delay_us(1);
LCD_EN(0);
}
//写数据
void WriteDataLCD(unsigned char WDLCD)
{
ReadStatusLCD(); //检测忙
LCD_RS(1);
LCD_RW(0);
LCD_EN(0);
Delay_us(1);
LCD_WriteData(WDLCD);
LCD_EN(1);
Delay_us(1);
LCD_EN(0);
}
uint8_t
LCD_read(uint8_t RS)
{
volatile uint8_t buf = 0;
LCD_DATA_PORT->DIR &= ~(0xF0);
LCD_RS(RS);
LCD_RW(1);
LCD_EN(1);
LCD_EN(0);
buf = LCD_DATA_PORT->DATA & 0xF0;
LCD_EN(1);
LCD_EN(0);
buf |= LCD_DATA_PORT->DATA >> 4;
return buf;
}
void
__LCD_write(uint8_t RS,uint8_t data,uint8_t wait){
LCD_DATA_PORT->DIR |= 0xF0;
LCD_RS(RS);
LCD_RW(0);
LCD_DATA_PORT->DATA = (LCD_CONTROL_PORT->DATA & ~(0xF0))|(data&0xF0);
LCD_EN(1);
LCD_EN(0);
data <<=4;
LCD_DATA_PORT->DATA = (LCD_CONTROL_PORT->DATA & ~(0xF0))|(data&0xF0);
LCD_EN(1);
LCD_EN(0);
if(wait){
while(LCD_read(0) & 0x80);
}
}
//读状态
void ReadStatusLCD(void)
{
unsigned char lcd_status;
LCD_RS(0);
LCD_RW(1);
LCD_Data_In();
do
{
LCD_EN(1);
Delay_us(1);
lcd_status=GPIO_ReadInputData( LCD12864_GPIO);
LCD_EN(0);
}
while (lcd_status&Busy); //检测忙信号
LCD_Data_Out();
}
