第9章MSP430模数转换ADC分析.ppt

有限长通道序列：某些通道的EOS=1 无限长通道序列：所有通道的EOS=0 #include msp430x14x.h A0result EQU 0200h ; Channel A0 results A1result EQU 0210H ; Channel A1 results A2result EQU 0220H ; Channel A2 results A3result EQU 0230H ; Channel A3 results ;------------------------------------------------------------------------------ ORG 01100h ; Program Start ;------------------------------------------------------------------------------ RESET mov #0A00h,SP ; Initialize stackpointer mov #WDTPW+WDTHOLD,WDTCTL ; Stop watchdog clr R5 ; Clear pointer bis.b #BIT0+BIT1+BIT2+BIT3,P6SEL ; Enable A/D inputs mov #SHT0_8+MSC+ADC12ON,ADC12CTL0 mov #SHP+CONSEQ_3,ADC12CTL1 mov #BIT3,ADC12IE ; Enable ADC12IFG.3 mov.b #INCH_0,ADC12MCTL0 ; A0 goes to MEM0 mov.b #INCH_1,ADC12MCTL1 ; A1 goes to MEM1 mov.b #INCH_2,ADC12MCTL2 ; A2 goes to MEM2 mov.b #EOS+INCH_3,ADC12MCTL3 ; A3 goes to MEM3, end of sequence Main bis #ENC,ADC12CTL0 ; Enable conversions bis #ADC12SC,ADC12CTL0 ; 软件启动采样和转换 bis #CPUOFF+GIE,SR ; Hold in LPM0, Enable interrupts nop ; 软件启动后，通道序列的采样和转换无需CPU的干预 ;------------------------------------------------------------------------------ ADC12ISR ; 当通道3转换完毕后进入该中断子程 mov ADC12MEM0,A0result(R5) ; Move results to RAM mov ADC12MEM1,A1result(R5) ; Move results to RAM mov ADC12MEM2,A2result(R5) ; Move results to RAM mov ADC12MEM3,A3result(R5) ; Move results to RAM, IFG reset incd R5 ; Increment results table pointer and #0Eh,R5 ; Modulo pointer reti ;---------------------------------------------