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参考这个例程不行吗?
/* --COPYRIGHT--,BSD_EX * Copyright (c) 2014, 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. * ******************************************************************************* * * MSP430 CODE EXAMPLE DISCLAIMER * * MSP430 code examples are self-contained low-level programs that typically * demonstrate a single peripheral function or device feature in a highly * concise manner. For this the code may rely on the device's power-on default * register values and settings such as the clock configuration and care must * be taken when combining code from several examples to avoid potential side * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware * for an API functional library-approach to peripheral configuration. * * --/COPYRIGHT--*/ //****************************************************************************** // MSP430FR211x Demo - ADC, Sample A2/A1/A0, internal 1.5V Ref. // // Description: This example works on Sequence-of-Channels Mode. // A2/A1/A0 is sampled 16ADCclks with reference to 1.5V. // Internal oscillator times sample (16x) and conversion(13x). // Inside ADC_ISR A2/A1/A0 sample value put into array ADC_Result[3]. // ACLK = default REFO ~32768Hz, MCLK = SMCLK = default DCODIV ~1MHz. // // // MSP430FR2111 // ----------------- // /|\| | // | | | // --|RST | // | | // >---|P1.2/A2 | // >---|P1.1/A1 | // >---|P1.0/A0 | // // // Xiaodong Li // Texas Instruments Inc. // Dec. 2015 // Built with IAR Embedded Workbench v6.40 & Code Composer Studio v6.1 //****************************************************************************** #include <msp430.h> unsigned char ADC_Result[3]; // 8-bit ADC conversion result array unsigned char i; int main(void) { WDTCTL = WDTPW | WDTHOLD; // Stop WDT // Configure ADC A0~2 pins P1SEL0 |= BIT0 + BIT1 + BIT2; P1SEL1 |= BIT0 + BIT1 + BIT2; // Disable the GPIO power-on default high-impedance mode to activate // previously configured port settings PM5CTL0 &= ~LOCKLPM5; // Configure ADC ADCCTL0 |= ADCSHT_2 | ADCMSC | ADCON; // 16ADCclks, MSC, ADC ON ADCCTL1 |= ADCSHP | ADCCONSEQ_1 | ADCSSEL_1; // ADC clock ACLK, sampling timer, s/w trig.,single sequence ADCCTL2 &= ~ADCRES_1; // 8-bit conversion results ADCMCTL0 |= ADCINCH_2 | ADCSREF_1; // A0~2(EoS); Vref=1.5V ADCIE |= ADCIE0; // Enable ADC conv complete interrupt // Configure reference PMMCTL0_H = PMMPW_H; // Unlock the PMM registers PMMCTL2 |= INTREFEN; // Enable internal reference __delay_cycles(400); // Delay for reference settling __no_operation(); while(1) { i = 2; while(ADCCTL1 & ADCBUSY); // Wait if ADC core is active ADCCTL0 |= ADCENC | ADCSC; // Sampling and conversion start __bis_SR_register(LPM0_bits | GIE); // Enter LPM0 w/ interrupts __no_operation(); // Only for debug __delay_cycles(5000); __no_operation(); } } // ADC interrupt service routine #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__) #pragma vector=ADC_VECTOR __interrupt void ADC_ISR(void) #elif defined(__GNUC__) void __attribute__ ((interrupt(ADC_VECTOR))) ADC_ISR (void) #else #error Compiler not supported! #endif { switch(__even_in_range(ADCIV,ADCIV_ADCIFG)) { case ADCIV_NONE: break; case ADCIV_ADCOVIFG: break; case ADCIV_ADCTOVIFG: break; case ADCIV_ADCHIIFG: break; case ADCIV_ADCLOIFG: break; case ADCIV_ADCINIFG: break; case ADCIV_ADCIFG: ADC_Result[i] = ADCMEM0; if(i == 0) { __bic_SR_register_on_exit(LPM0_bits); // Exist LPM0 } else { i--; } break; default: break; } }
或者转移到MSP430板块提问