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; --COPYRIGHT--,BSD_EX | |
; Copyright (c) 2012, Texas Instruments Incorporated | |
; All rights reserved. | |
; | |
; Redistribution and use in source and binary forms, with or without | |
; modification, are permitted provided that the following conditions | |
; are met: | |
; | |
; * Redistributions of source code must retain the above copyright | |
; notice, this list of conditions and the following disclaimer. | |
; | |
; * Redistributions in binary form must reproduce the above copyright | |
; notice, this list of conditions and the following disclaimer in the | |
; documentation and/or other materials provided with the distribution. | |
; | |
; * Neither the name of Texas Instruments Incorporated nor the names of | |
; its contributors may be used to endorse or promote products derived | |
; from this software without specific prior written permission. | |
; | |
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
; THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
; EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
; | |
;******************************************************************************* | |
; MSP430F20x2/3 Demo - USI SPI Interface to TLC549 8-bit ADC | |
; | |
; Description: This program demonstrate a USI in SPI mode interface to a | |
; TLC549 8-bit ADC. If AIN > 0.5(REF+ - REF-), P1.0 set, else reset. | |
; ACLK = n/a, MCLK = SMCLK = default DCO, UCICLK = SMCLK/4 | |
; //** VCC must be at least 3v for TLC549 **// | |
; | |
; MSP430F20x2/3 | |
; ----------------- | |
; /|\| XIN|- | |
; TLC549 | | | | |
; ------------- --|RST XOUT|- | |
; | CS|<---|P1.1 | | |
; | DATAOUT|--->|P1.7/SOMI P1.0|-->LED | |
; ~>|AIN I/O CLK|<---|P1.5/UCLK0 | | |
; | |
; P.Thanigai | |
; Texas Instruments Inc. | |
; May 2007 | |
; Built with Code Composer Essentials Version: 2.0 | |
;******************************************************************************* | |
.cdecls C,LIST, "msp430.h" | |
;------------------------------------------------------------------------------ | |
.text ; Program Start | |
;------------------------------------------------------------------------------ | |
RESET mov.w #0280h,SP ; Initialize stackpointer | |
StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop watchdog timer | |
SetupP1 clr.b &P1OUT ; | |
bis.b #03h,&P1DIR ; P1.0/1 output direction | |
SetupUSI bis.b #USIPE7+USIPE5+USIMST+USIOE,&USICTL0; Port, SPI master | |
bis.b #USIIE,&USICTL1 ; Counter interrupt, flag remains | |
mov.b #USIDIV_2+USISSEL_2,&USICKCTL ; /4 SMCLK | |
bic.b #USISWRST,&USICTL0 ; Enable USI | |
mov.b #08h,&USICNT ; init-load counter, clears flag | |
; | |
Mainloop bis.w #LPM0+GIE,SR ; Enter LPM0, enable interrupts | |
jmp Mainloop ; Again | |
; | |
;------------------------------------------------------------------------------- | |
USI_ISR ; | |
;------------------------------------------------------------------------------- | |
bis.b #02h,&P1OUT ; Disable TLC549 | |
cmp.b #07Fh,&USISRL ; | |
bic.b #01h,&P1OUT ; | |
jlo USI_ISR1 ; | |
bis.b #01h,&P1OUT ; | |
USI_ISR1 bic.b #02h,&P1OUT ; Enable TLC549 | |
mov.b #08h,&USICNT ; re-load counter | |
reti ; | |
; | |
;------------------------------------------------------------------------------ | |
; Interrupt Vectors | |
;------------------------------------------------------------------------------ | |
.sect ".reset" ; MSP430 RESET Vector | |
.short RESET ; | |
.sect ".int04" ; USI Vector | |
.short USI_ISR ; | |
.end |
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