您好！
我正在使用引脚3 /P1.5作为 ADC 输入。 我不知道如何 将引脚配置为 ADC 输入、因为 P1SEL1和 P1SEL0被标记为错误/无法识别、仅允许 P1SEL。 但是、设置 P1SEL |= BIT5；选择第二功能(我想吗？) 而不是 ADC 的第三功能。 如何设置这些引脚、您是否有针对2230的简单读取 ADC 示例？
谢谢
理查德
对于该器件、您不使用选择寄存器、而是使用 ADC 寄存器：
查看 Resource Explorer 中的数据表和示例：
//******************************************************************************
// MSP430G2230 Demo - ADC10, Sample A5, AVcc Ref, Set P1.2 if > 0.5*AVcc
//
// Description: A single sample is made on A5 with reference to AVcc.
// Software sets ADC10SC to start sample and conversion - ADC10SC
// automatically cleared at EOC. ADC10 internal oscillator times sample (16x)
// and conversion. In Mainloop MSP430 waits in LPM0 to save power until ADC10
// conversion complete, ADC10_ISR will force exit from LPM0 in Mainloop on
// reti. If A5 > 0.5*AVcc, P1.5 set, else reset.
//
// MSP430G2230
// -----------------
// /|\| XIN|-
// | | |
// --|RST XOUT|-
// | |
// >---|P1.5/A5 P1.2|-->LED
//
// B. Nisarga
// Texas Instruments, Inc
// December 2011
// Built with CCE Version: 5.1 and IAR Embedded Workbench Version: 5.4
//******************************************************************************
#include <msp430.h>
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
/* Initialization Code */
P1REN = 0x1B; // Terminate unavailable Port1 pins (P1.0/1/3/4) properly
// Config as Input with pull-down enabled
BCSCTL3 |= LFXT1S_2; // Select VLO as low freq clock
/* End Initialization Code */
ADC10CTL0 = ADC10SHT_2 | ADC10ON | ADC10IE; // ADC10ON, interrupt enabled
ADC10CTL1 = INCH_5; // input A5
ADC10AE0 |= BIT5; // PA.5 ADC option select
P1DIR |= BIT2; // Set P1.2 to output direction
for (;;)
{
ADC10CTL0 |= ENC | ADC10SC; // Sampling and conversion start
__bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR will force exit
if (ADC10MEM < 0x1FF)
P1OUT &= ~BIT2; // Clear P1.2 LED off
else
P1OUT |= BIT2; // Set P1.2 LED on
}
}
// ADC10 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(ADC10_VECTOR))) ADC10_ISR (void)
#else
#error Compiler not supported!
#endif
{
__bic_SR_register_on_exit(CPUOFF); // Clear CPUOFF bit from 0(SR)
}