uart.asm

本人下载的电力系统相关资料,具有极其重要的参考价值

.define 	P_UART_Command1   		0x7021;		// Command1 Port for UART
.define 	P_UART_Command2   		0x7022;		// Command2 Port for UART
.define 	P_UART_Data 	   		0x7023; 	// Data Port for UART
.define 	P_UART_BaudScalarLow 	0x7024;		// Set Baud Rate scalar low
.define 	P_UART_BaudScalarHigh 	0x7025;		// Set Baud Rate scalar high
.define     P_Watchdog_Clear    	0x7012      // Watchdog Reset

.define 	P_IOB_Data       		0x7005      // Write Data into the data register and read from IOB pad
.define 	P_IOB_Buffer     		0x7006      // Write Data into buffer register and read from buffer register
.define 	P_IOB_Dir         		0x7007      // Direction vector for IOB
.define 	P_IOB_Attrib       		0x7008  	// Attribute vector for IOB
.external 	_GB_WrData
.code
//===========================================================================================
// Function Name: SPR4096_IO_WriteAByte
// Description  :  
// Syntax       : SPR4096_IO_WriteAByte(unsigned long int Addr,Data);
// Input        :
// Output       : 
// Destroy 		: 
// Used 		: 
//==========================================================================================
.public		_SP_Uart_Init
_SP_Uart_Init:
		r1=0x0000
		[P_IOB_Data]=r1
		r1=0x0400
		[P_IOB_Attrib]=r1
		r1=0x0400
		[P_IOB_Dir]=r1
		
		r1=0x05									//baud rate = 4800
		[P_UART_BaudScalarHigh]=r1		
		r1=0x00
		[P_UART_BaudScalarLow]=r1
//		r1=0x20
//		[P_UART_Command1]=r1
		r1=0x00
		[P_UART_Command1]=r1
		r1=0x80
		[P_UART_Command2]=r1					//enable Rx
		retf
//===========================================================================================
// Function Name: SPR4096_IO_WriteAByte
// Description  :  
// Syntax       : SPR4096_IO_WriteAByte(unsigned long int Addr,Data);
// Input        :
// Output       : 
// Destroy 		: 
// Used 		: 
//==========================================================================================
.public		_SP_Uart_Rx
_SP_Uart_Rx:
		r1=0x0001
		[P_Watchdog_Clear]=r1		
		r2=0x80
		test  r2,[P_UART_Command2]
		jz	_SP_Uart_Rx
		r1=[P_UART_Data]
		[_GB_WrData]=r1
		retf