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tlc3548for msp430程序小弟看不懂，那位仁兄能幫忙 |
| 作者：supersunny 欄目：DSP技術 |
最近作一個項目用到14位ad，沒什么經驗，就選了3548，到用的時候才發(fā)現(xiàn)自己不會用，看datasheet弄了一周也沒效果，郁悶了，感謝那位達人，幫我看看 ;************************************************************************ ; MSP430F149.html">MSP430F149 DEMO – SPI Communication with TLC3544/48 or TLC3574/78 EVM ; Program implements a DIGITAL FILTER – takes the average of 4 SAMPLEs.html">SAMPLEs ; from CH0 of the ADC and returns them to the TLV5636 DAC ; TLV3574/8 MSP430F149.html">MSP430F149 ; ------------- ------------- ; | SDI|<---|P3.1 | ; | SDO|--->|P3.2 | ; CH0~~~>|IN+ SCLK|<---|P3.3 | ; | /CS|<---|P3.5 | ; | FS|<---|P3.6 | ; | | ; TLV5636 DAC | | ; --------------- | | ; | SDI|--->|P3.1 | ; | FS|<---|P3.6 via PLD | ; | /CS|<---|P3.5 via PLD | ; ; Assembled with IAR Embedded Workshop for MSP430 Kickstart ; ; Texas Instruments, Inc. ; Tom Hendrick ; Data Acquisition Applications - DALLAS ; Dec. 2000 ;************************************************************************ #include "MSP430.html">MSP430x14x.h" // STANDARD Equations #include "TLC357X.h" // ADC Equations #include "legal.asm" // TI Legal Information ;************************************************************************ ;Constants ;************************************************************************ CS equ 020h ; Set p3.5 to chip SELECT function FS equ 040h ; Set p3.6 to frame sync function CSTART equ 080h ; Set p3.7 to cstart function SAMPLEs.html">SAMPLEs equ 004h ; Set NUMBER of SAMPLEs.html">SAMPLEs SLAA126A Interfacing the TLC3544/48 ADC to the MSP430F149.html">MSP430F149 9 ;************************************************************************ ;Setup RAM ;************************************************************************ RSEG UDATA0 ADC_Data DS 0 ; Data storage for ADC SAMPLEs.html">SAMPLEs ;************************************************************************ ;Setup Stack ;************************************************************************ RSEG CSTACK DS 0 ;************************************************************************ ;Program Code ;************************************************************************ RSEG CODE ;************************************************************************ RESET_ISR mov #SFE(CSTACK),SP ; define stackpointer call #Init_Sys ; Initialize SYSTEM ports call #SETUP_ADC ; Initialize ADC call #Mainloop ; Start Main Loop Mainloop mov.b #SAMPLEs.html">SAMPLEs, R10 ; Load # of SAMPLEs.html">SAMPLEs in R10 mov #00, R8 ; Clear R8 SampleLoop bic.b #CS,&P3OUT ; Enable TLC3544/48 bis.b #01h,&P1OUT ; Set a TEST.html">TEST bit – Bit is cleared in ISR Read_ADC mov.b #CH0,&U0TXBUF ; DUMMY.html">DUMMY write to SPI (generates SCLK) call #CLEAR mov.b &U0RXBUF,ADC_Data(R8) ; Store Upper Byte inc R8 ; Increment data storage pointer mov.b #DUMMY,&U0TXBUF ; DUMMY.html">DUMMY write to SPI (generates SCLK) call #CLEAR mov.b &U0RXBUF,ADC_Data(R8) ; Store Lower Byte inc R8 ; Increment data storage pointer TEST: mov.b #DUMMY,&U0TXBUF ; DUMMY.html">DUMMY write to SPI SLAA126A 10 Interfacing the TLC3544/48 ADC to the MSP430F149.html">MSP430F149 call #CLEAR bit.b #01h, &P1OUT ; Continue DUMMY writes till interrupt jnz TEST dec R10 cmp #00,R10 jnz SampleLoop ; Repeat till R10 = 0 ; jmp Mainloop ; Repeat ; Remove remark from above LINE to skip transmit BACK to DAC Write_DAC mov #0x0000, R13 ; Clear Register mov #SAMPLEs.html">SAMPLEs, R10 mov #0x0000, R8 ; Load R8 with 0x0000h next mov ADC_Data(R8), R12 swpb R12 ; Swap bytes in R12 and.w #0xFFF0, R12 ; Strip any trailing bits rrc.w R12 ; Shift data 4 places rrc.w R12 ; to conform to rrc.w R12 ; DAC input format rrc.w R12 and.w #0x0FFF, R12 ; Strip any carries add.w R12, R13 ; Add shifted data to R13 incd R8 decd R10 cmp #00, R10 ; Is R10 = 0? jnz next ; Get next SAMPLE rrc.w R13 ; Shift result (divide by 4) rrc.w R13 ; and.w #0x0FFF, R13 ; Strip any carries add.w #0x4000, R13 ; Set DAC FAST Mode bic.b #FS,&P3OUT ; toggle Frame Sync bis.b #FS,&P3OUT ; toggle Frame Sync bic.b #FS,&P3OUT ; to DAC swpb R13 ; Align MSB First mov.b R13,&U0TXBUF ; Transmit upper Data Byte to DAC call #CLEAR swpb R13 ; Prepare Lower Byte mov.b R13,&U0TXBUF ; Transmit lower Data Byte to DAC call #CLEAR bis.b #FS,&P3OUT ; Set Frame Sync jmp Mainloop ; Repeat SLAA126A Interfacing the TLC3544/48 ADC to the MSP430F149.html">MSP430F149 11 ;******************************* ; Clear TX Flag ;******************************* CLEAR bit.b #UTXIFG0, &IFG1 ; Thank You Eric! TXBUF ready? jnc CLEAR ; 1 = ready bic.b #UTXIFG0, &IFG1 ret ;************************************************************************ Init_Sys; MODULES and Controls Registers set-up subroutine ;************************************************************************ StopWDT mov #WDTPW+WDTHOLD,&WDTCTL ; Stop Watchdog Timer SetupClock bic.b #XTOFF, &BCSCTL1 bis.b #SELM1+SELS, &BCSCTL2 HF_WAIT ; 8MHZ CRYSTAL used – wait for stabilization bic.b #OFIFG, &IFG1 bit.b #OFIFG, &IFG1 jnz HF_WAIT bic.b #OFIFG, &IFG1 ; Clear Oscillator fault flag bit.b #OFIFG, &IFG1 ; TEST for clear SetupPort bis.b #001h,&P1DIR ; P1.1 set to OUTPUT – Toggles LED bis.b #01Eh,&P3SEL ; P3.1,2,3,4 SPI option SELECT bis.b #CS+FS+CSTART,&P3DIR ; /CS, FS & CSTART = OUTPUT direction bis.b #CS+FS+CSTART,&P3OUT ; P3.5,6,7 CS & FS set SetupInterrupt bic.b #02h, &P1IFG ; Clear Interrupt flags bis.b #02h, &P1IES ; Set for edge SELECTion bis.b #02h, &P1IE ; Enable external interrupt SetupSPI bis.b #040h,&ME1 ; Enable SPI TX/RX mov.b #CHAR+SYNC+MM,&U0CTL ; 8-bit SPI MASTER bis.b #SSEL0+SSEL1+STC,&U0TCTL mov.b #02h,&U0BR0 ; Set SPI Baud Rate mov.b #00h,&U0BR1 mov.b #00h,&U0MCTL eint ; Enable interrupts SLAA126A 12 Interfacing the TLC3544/48 ADC to the MSP430F149.html">MSP430F149 ret ;********************************************************************************* SETUP_ADC ; Initialize the AtoD Converter ;********************************************************************************* bic.b #CS,&P3OUT ; Set ADC /CS Lo mov.b #WRITE,&U0TXBUF ; DUMMY.html">DUMMY write to SPI (generates SCLK) call #CLEAR ; Clear SPI Flags mov.b #DUMMY,&U0TXBUF ; DUMMY.html">DUMMY write to SPI (generates SCLK) call #CLEAR bis.b #CS,&P3OUT ; Set ADC /CS Hi bic.b #CS,&P3OUT ; Set ADC /CS Lo ; Configuration Write to ADC ; See TLC357X.h file for details on the following parameters mov.b #(WRITE+SHORT_SAMP+EXT_REF),&U0TXBUF call #CLEAR mov.b #DUMMY,&U0TXBUF ; DUMMY.html">DUMMY write to SPI (generates SCLK) call #CLEAR bis.b #CS,&P3OUT ; Set ADC /CS Hi ret ;********************************************************************************* IRQ_ISR; Exit LPM0 on reti ;********************************************************************************* bic.b #01h, &P1OUT bis.b #CS, &P3OUT ; Set ADC /CS High bic.b #02h, &P1IFG reti ; return from interrupt ;********************************************************************************* COMMON INTVEC ; MSP430x11x1/MSP430F14x Interrupt vectors ;********************************************************************************* ORG RESET_VECTOR RESET_VEC DW RESET_ISR ; POR, ext. Reset, Watchdog ORG PORT1_VECTOR PORT1_VEC DW IRQ_ISR ; PORT1, Ext. Int. END |
| 2樓： | >>參與討論 |
| 作者： xiaoxiao99 于 2006/1/6 12:01:00 發(fā)布：
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