关于MSP430的ADC中断相关问题
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在进行MSP430ADC相关代码操作的时候,遇到一个百思不得其解的问题,我们按照要求设置好ADC通道,ADC中断,程序始终无法进入到ADC中断中去,本人一次又一次确认通道选择是否出错,中断是否设置,但是依然无法进入中断,经过试验和搜索,终于找到了问题所在。
在上面的事例中,我们使用的是MSP430的P6.4引脚,ADC通道4,因为使用的是单通道单次转换模式,对应的中断是ADC12IFG0,对应的值在ADC12MEM0中读取,对于单通道多次转换模式也适用。
MSP430的ADC12IE寄存器虽然是用来使能各个ADC中断的,但是在单通道转换模式下,无论你使用的是哪个ADC通道,ADC12IE对应的中断只能是0x01,对应的中断标志位为ADC12IFG0,并且只能在ADC12MEM0中读取ADC的值。下面给出一个单通道转换的实例:
#include "msp430x54x.h"unsigned int adc;void main(void){ WDTCTL = WDTPW + WDTHOLD; // Stop WDT ADC12CTL0 = ADC12SHT02 + ADC12ON; // Sampling time, ADC12 on ADC12CTL1 = ADC12SHP; // Use sampling timer ADC12IE = 0x01; // Enable interrupt ADC12MCTL0 |= ADC12INCH_4; __delay_cycles(100); ADC12CTL0 |= ADC12ENC; P6SEL |= 0x10; // P6.4 ADC option select while (1) { ADC12CTL0 |= ADC12SC; // Start sampling/conversion __bis_SR_register(LPM0_bits + GIE); // LPM0, ADC12_ISR will force exit __no_operation(); // For debugger }}#pragma vector = ADC12_VECTOR__interrupt void ADC12_ISR(void){ switch(__even_in_range(ADC12IV,34)) { case 0: break; // Vector 0: No interrupt case 2: break; // Vector 2: ADC overflow case 4: break; // Vector 4: ADC timing overflow case 6: // Vector 6: ADC12IFG0 adc = ADC12MEM0; // Read ADC12MEM __bic_SR_register_on_exit(LPM0_bits); // Exit active CPU break; case 8: break; // Vector 8: ADC12IFG1 case 10: break; // Vector 10: ADC12IFG2 case 12: break; // Vector 12: ADC12IFG3 case 14: break; // Vector 14: ADC12IFG4 case 16: break; // Vector 16: ADC12IFG5 case 18: break; // Vector 18: ADC12IFG6 case 20: break; // Vector 20: ADC12IFG7 case 22: break; // Vector 22: ADC12IFG8 case 24: break; // Vector 24: ADC12IFG9 case 26: break; // Vector 26: ADC12IFG10 case 28: break; // Vector 28: ADC12IFG11 case 30: break; // Vector 30: ADC12IFG12 case 32: break; // Vector 32: ADC12IFG13 case 34: break; // Vector 34: ADC12IFG14 default: break; }}
在上面的事例中,我们使用的是MSP430的P6.4引脚,ADC通道4,因为使用的是单通道单次转换模式,对应的中断是ADC12IFG0,对应的值在ADC12MEM0中读取,对于单通道多次转换模式也适用。
对于序列通道转换模式,ADC12IE的值取决于使用的ADC通道,ADC的值也从对应通道的ADC12MEM中读取,下面是序列通道单次转换的实例
#include "msp430x54x.h"volatile unsigned int results[4]; // Needs to be global in this example // Otherwise, the compiler removes it // because it is not used for anything.void main(void){ WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer P6SEL = 0x0F; // Enable A/D channel inputs ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT0_2; // Turn on ADC12, set sampling time ADC12CTL1 = ADC12SHP+ADC12CONSEQ_1; // Use sampling timer, single sequence ADC12MCTL0 = ADC12INCH_0; // ref+=AVcc, channel = A0 ADC12MCTL1 = ADC12INCH_1; // ref+=AVcc, channel = A1 ADC12MCTL2 = ADC12INCH_2; // ref+=AVcc, channel = A2 ADC12MCTL3 = ADC12INCH_3+ADC12EOS; // ref+=AVcc, channel = A3, end seq. ADC12IE = 0x08; // Enable ADC12IFG.3 ADC12CTL0 |= ADC12ENC; // Enable conversions while(1) { ADC12CTL0 |= ADC12SC; // Start convn - software trigger __bis_SR_register(LPM4_bits + GIE); // Enter LPM4, Enable interrupts __no_operation(); // For debugger }}#pragma vector=ADC12_VECTOR__interrupt void ADC12ISR (void){ switch(__even_in_range(ADC12IV,34)) { case 0: break; // Vector 0: No interrupt case 2: break; // Vector 2: ADC overflow case 4: break; // Vector 4: ADC timing overflow case 6: break; // Vector 6: ADC12IFG0 case 8: break; // Vector 8: ADC12IFG1 case 10: break; // Vector 10: ADC12IFG2 case 12: // Vector 12: ADC12IFG3 results[0] = ADC12MEM0; // Move results, IFG is cleared results[1] = ADC12MEM1; // Move results, IFG is cleared results[2] = ADC12MEM2; // Move results, IFG is cleared results[3] = ADC12MEM3; // Move results, IFG is cleared __bic_SR_register_on_exit(LPM4_bits); // Exit active CPU, SET BREAKPOINT HERE case 14: break; // Vector 14: ADC12IFG4 case 16: break; // Vector 16: ADC12IFG5 case 18: break; // Vector 18: ADC12IFG6 case 20: break; // Vector 20: ADC12IFG7 case 22: break; // Vector 22: ADC12IFG8 case 24: break; // Vector 24: ADC12IFG9 case 26: break; // Vector 26: ADC12IFG10 case 28: break; // Vector 28: ADC12IFG11 case 30: break; // Vector 30: ADC12IFG12 case 32: break; // Vector 32: ADC12IFG13 case 34: break; // Vector 34: ADC12IFG14 default: break; }}
上面的事例使用了ADC的0,1,2,3四个通道,因为ADC可以一次转换多个通道,所以只使能了通道3的中断。
ADC的配置顺序尽量与上述列举的顺序一致,否则有概率会读取失败,具体原因笔者没有去深究
以上事例均在MSP430F5xx/6xx上实测
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