subfunction2.inc

这是在C5000系列DSP上实现UART（异步串口）TL16c550芯片的汇编语言实现代码

;==============================================================================
;
;		Initialization McBSP #0
;
;==============================================================================

;==============================================================================
;		1.XRST_=RRST_=0
;==============================================================================
INIT_MCBSP0	.macro
		STM		#SPCR10,SPSA0
		NOP
		NOP
		STM		#0x0000,SPSD0
		NOP
		NOP
	
		STM		#SPCR20,SPSA0
		NOP
		NOP
		STM		#0x0000,SPSD0
		NOP
		NOP
		
;==============================================================================
;		2.Program McBSP registers
;==============================================================================
		STM		#SPCR10,SPSA0
		NOP
		NOP
		STM		#INIT_SPCR10,SPSD0
		NOP
		NOP
	
		STM		#SPCR20,SPSA0
		NOP
		NOP
		STM		#INIT_SPCR20,SPSD0
		NOP
		NOP

		STM		#PCR0,SPSA0
		NOP
		NOP
		STM		#INIT_PCR0,SPSD0
		NOP
		NOP

		STM		#RCR10,SPSA0
		NOP
		NOP
		STM		#INIT_RCR10,SPSD0
		NOP
		NOP	
		
		STM		#RCR20,SPSA0
		NOP
		NOP
		STM		#INIT_RCR20,SPSD0
		NOP
		NOP		
		
		STM		#XCR10,SPSA0
		NOP
		NOP
		STM		#INIT_XCR10,SPSD0
		NOP
		NOP	
		
		STM		#XCR20,SPSA0
		NOP
		NOP
		STM		#INIT_XCR20,SPSD0
		NOP
		NOP	
	
		STM		#SRGR10,SPSA0
		NOP
		NOP
		STM		#INIT_SRGR10,SPSD0
		NOP
		NOP	
		
		STM		#SRGR20,SPSA0
		NOP
		NOP
		STM		#INIT_SRGR20,SPSD0
		NOP
		NOP	
		
		NOP
		NOP
		NOP
		NOP

;==============================================================================
;		3.XRST_=RRST_=1
;==============================================================================	
		STM		#SPCR10,SPSA0
		NOP
		NOP
		STM		#0081h,SPSD0
		NOP
		NOP
		
		STM		#SPCR20,SPSA0
		NOP
		NOP
		STM		#0001h,SPSD0
		NOP
		NOP

;==============================================================================
;		4.Wait for two sample rate generator duration
;==============================================================================			
		NOP
		NOP
		NOP
		NOP
		
		NOP
		NOP
		NOP
		NOP
		.endm