lcdiof.c

ST7032i驱动应用实例(I2C接口)

// ------------------ The Basic I/O functions for LCD --------------------------
/*  FileName: lcdiof.c
	Version : 0.1
	Last Updated: 2007-4-25
	Description:
	This library contains the necessary functions for input and output data 
	to the controller IC of LCM.
	Program Coder: Seeseawe
*/

#ifdef __PORT_CONFIG__
	// Port configuration of MCU
	void PortConfig(void)
	{
		//PortDir(LCD_CtrlPort_DDR, 0xFF);
		//PortDir(LCD_DataPort_DDR, 0xFF);	
		#if defined(MCU_6800_8BIT)
			sbi(LCD_CtrlPort, LCD_BM1);
			sbi(LCD_CtrlPort, LCD_BM0);
		#elif defined(MCU_6800_4BIT)
			sbi(LCD_CtrlPort, LCD_PS);
			sbi(LCD_CtrlPort, LCD_C86);
		#elif defined(MCU_8080_8BIT)
			sbi(LCD_CtrlPort, LCD_BM1);
			cbi(LCD_CtrlPort, LCD_BM0);
		#elif defined(MCU_8080_4BIT)
			sbi(LCD_CtrlPort, LCD_PS);
			cbi(LCD_CtrlPort, LCD_C86);
		#elif defined(LCD_4SPI)
			LCD_DataPort = 0xFF;
			cbi(LCD_CtrlPort, LCD_BM1);
			cbi(LCD_CtrlPort, LCD_BM0);
			sbi(LCD_DataPort, LCD_SM1);
			cbi(LCD_DataPort, LCD_SM0);
			cbi(LCD_CtrlPort, LCD_WR1);
			cbi(LCD_CtrlPort, LCD_WR0);			
		#elif defined(LCD_3SPI)
			spi_init();
			/*
			cbi(LCD_CtrlPort, LCD_BM1);
			sbi(LCD_CtrlPort, LCD_BM0);
			sbi(LCD_DataPort, LCD_SM1);
			cbi(LCD_DataPort, LCD_SM0);
			cbi(LCD_CtrlPort, LCD_WR1);
			cbi(LCD_CtrlPort, LCD_WR0);
			cbi(LCD_CtrlPort, LCD_A0);
			*/
		#elif defined(LCD_I2C)
			LCD_DataPort_DDR |= (1 << I2C_SDA)|(1 << I2C_SCL);
			LCD_DataPort |= (1 << I2C_SDA)|(1 << I2C_SCL);
			//sbi(LCD_CtrlPort, LCD_PS);
			//sbi(LCD_CtrlPort, LCD_C86);
		#endif
	}
#endif

#ifdef LCD_RST
	// Reset LCD
	void LCD_Reset(void)
	{
		cbi(LCD_CtrlPort, LCD_RST);
		DelayUs(10);
		sbi(LCD_CtrlPort, LCD_RST);
		DelayMs(100);
	}
#endif

// Function for sending a byte to LCD
void SendByte(uint8 DatCmd, uint8 dByte)
{
	#ifdef MCU_6800_8BIT
		PortDir(LCD_DataPort_DDR, 0xFF);	// Set the port as Output		
		LCD_Enable();
		//LCD_A0 = DatCmd;
		if (DatCmd)
			sbi(LCD_CtrlPort, LCD_A0);
		else
			cbi(LCD_CtrlPort, LCD_A0);
		//LCD_RW = 0;
		cbi(LCD_CtrlPort, LCD_RW);
		//LCD_E = 1;
		sbi(LCD_CtrlPort, LCD_E);
		LCD_DataPort = dByte;
		//LCD_E = 0;
		cbi(LCD_CtrlPort, LCD_E);
		//LCD_RW = 1;
		sbi(LCD_CtrlPort, LCD_RW);
		LCD_Disable();
	#elif defined(MCU_6800_4BIT)
		PortDir(LCD_DataPort_DDR, 0xF0);
		LCD_Enable();
		if (DatCmd)
			sbi(LCD_CtrlPort, LCD_A0);
		else
			cbi(LCD_CtrlPort, LCD_A0);
		cbi(LCD_CtrlPort, LCD_RW);
		sbi(LCD_CtrlPort, LCD_E);
		LCD_DataPort = dByte & 0xF0;	//Higher 4-bit
		cbi(LCD_CtrlPort, LCD_E);
		sbi(LCD_CtrlPort, LCD_E);
		LCD_DataPort = dByte << 4;		//Lower 4-bit
		cbi(LCD_CtrlPort, LCD_E);
		sbi(LCD_CtrlPort, LCD_RW);
		LCD_Disable();
	#elif defined(MCU_8080_8BIT)
		PortDir(LCD_DataPort_DDR, 0xFF);		// Set the port as Output
		LCD_Enable();
		if (DatCmd)
			sbi(LCD_CtrlPort, LCD_A0);
		else
			cbi(LCD_CtrlPort, LCD_A0);
		sbi(LCD_CtrlPort, LCD_RD);
		cbi(LCD_CtrlPort, LCD_WR);
		LCD_DataPort = dByte;
		sbi(LCD_CtrlPort, LCD_WR);
		LCD_Disable();
	#elif defined(MCU_8080_4BIT)
		PortDir(LCD_DataPort_DDR, 0xFF);
		LCD_Enable();
		if (DatCmd)
			sbi(LCD_CtrlPort, LCD_A0);
		else
			cbi(LCD_CtrlPort, LCD_A0);
		sbi(LCD_CtrlPort, LCD_RD);
		cbi(LCD_CtrlPort, LCD_WR);
		LCD_DataPort = dByte & 0xF0;	//Higher 4-bit
		sbi(LCD_CtrlPort, LCD_WR);
		cbi(LCD_CtrlPort, LCD_WR);
		LCD_DataPort = dByte << 4;		//Lower 4-bit
		sbi(LCD_CtrlPort, LCD_WR);
		LCD_Disable();
	#elif defined(LCD_4SPI)
		LCD_Enable();
		if (DatCmd)
			sbi(LCD_CtrlPort, LCD_A0);
		else
			cbi(LCD_CtrlPort, LCD_A0);
		spi_sendbyte(dByte);
		LCD_Disable();
	#elif defined(LCD_3SPI)
		LCD_Enable();
		spi_sendbit(DatCmd);	// Sendout LCD_A0
		spi_sendbyte(dByte);
		LCD_Disable();
	#elif defined(LCD_I2C)
		I2C_Start();
		I2C_SendByte(LCD_I2C_ADDR);
		if (DatCmd == iDat)
		{
			I2C_SendByte(0x40);
		}
		else
		{
			I2C_SendByte(0x00);
		}
		I2C_SendByte(dByte);
		I2C_Stop();
	#endif
	//DelayUs(100);	// Special Delay for Character LCD
}

#ifdef LCD_READABLE
	// Read a data from LCD DDRAM
	// Page Address & Column Address should be set at first.
	// E.G. Gotoxy(PAddr, CAddr);
	uint8 LCD_ReadData(void)
	{
		uint8 dByte;
		SendByte(iCmd, 0xEF);		// Enter RMW Mode
		#if defined(MCU_6800_8BIT)
			PortDir(LCD_DataPort_DDR, 0x00);	// Set the port as input
			LCD_Enable();
			//LCD_A0 = iDat;
			if (iDat)
				sbi(LCD_CtrlPort, LCD_A0);
			else
				cbi(LCD_CtrlPort, LCD_A0);
			sbi(LCD_CtrlPort, LCD_E);
			DelayUs(4);			// A dummy read
			cbi(LCD_CtrlPort, LCD_E);
			DelayUs(4);
			sbi(LCD_CtrlPort, LCD_E);
			DelayUs(4);
			dByte = LCD_DataPins;	// Actual read
			cbi(LCD_CtrlPort, LCD_E);
			LCD_Disable();
		#elif defined(MCU_8080_8BIT)
			PortDir(LCD_DataPort_DDR, 0x00);	// Set the port as input
			LCD_Enable();
			//LCD_A0 = iDat;
			if (iDat)
				sbi(LCD_CtrlPort, LCD_A0);
			else
				cbi(LCD_CtrlPort, LCD_A0);
			sbi(LCD_CtrlPort, LCD_WR);
			cbi(LCD_CtrlPort, LCD_RD);
			DelayUs(4);			// A dummy read
			sbi(LCD_CtrlPort, LCD_RD);
			DelayUs(4);
			cbi(LCD_CtrlPort, LCD_RD);
			DelayUs(4);
			dByte = LCD_DataPins;	// Actual read
			sbi(LCD_CtrlPort, LCD_RD);
			LCD_Disable();
		#elif defined(LCD_4SPI)
			LCD_Enable();
			//LCD_A0 = iDat;
			if (iDat)
				sbi(LCD_CtrlPort, LCD_A0);
			else
				cbi(LCD_CtrlPort, LCD_A0);
			dByte = spi_readbyte();
			LCD_Disable();
		#elif defined(LCD_3SPI)
			LCD_Enable();
			spi_sendbit(iDat);	// Sendout LCD_A0
			dByte = spi_readbyte();
			LCD_Disable();
		#elif defined(LCD_I2C)
			I2C_Start();
			I2C_SendByte(LCD_I2C_ADDR | 0x01);
			dByte = I2C_ReadByte();
			I2C_SendAck(1);
			I2C_Stop();
		#endif
		SendByte(iCmd, 0xEE);		// Enter RMW Mode
		return dByte;
	}
	
	// Send a byte overlayed with the orginal data
	void AndByte(uint8 dByte)
	{
		uint8 OldData;
		OldData = LCD_ReadData();
		SendByte(iDat, OldData|dByte);
	}
#endif

// Write a Byte of data to the LCD
void LCD_WriteData(uint8 dByte)
{
	#ifdef LCD_READABLE
		AndByte(dByte);
	#else
		SendByte(iDat, dByte);
	#endif
}