ADC12通道转换~严重困扰~请高人指点

楼主 chaoslogic 于 2011-03-19 22:57:46

ADC12通道转换~严重困扰~请高人指点

求教高人~小弟正在做MSP430f149的ADC12采样~我想通过串口控制单片机选择采样通道~即发送数字0则A0通道开始采样~发送数字1则A1通道开始采样~以此类推~希望能够控制A0到A7八个通道的采样。但是在程序运行的时候无论我选择哪个通道~都是A0通道在采样~其他通道不起任何作用~而且在串口发送数据的时候会在有效数据后产生很多乱码~求教高人指点~感激不尽~部分程序代码如下：
//----------------------------interrupts----------------------------------------
#pragma vector=UART0RX_VECTOR
__interrupt void usart0_rx (void)
{
command=RXBUF0;

switch (command)
{
case 0:

ADC12CTL0 &= ~ADC12ON;
ADC12CTL0 &= ~ENC;
P6SEL |=0x01;
ADC12IE=0x01;
ADC12MCTL0=INCH_0;
ADC12MCTL0 = SREF_1;
ADC12CTL1 = CSTARTADD_0+SHP+CONSEQ_2;
ADC12CTL0 = ADC12ON+SHT0_15+MSC+REFON+REF2_5V;
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
break;
case 1:

ADC12CTL0 &= ~ADC12ON;
ADC12CTL0 &= ~ENC;

P6SEL |=0x02;
ADC12IE=0x02;
ADC12MCTL1=INCH_1;
ADC12MCTL1 = SREF_1;
ADC12CTL1 = CSTARTADD_1+SHP+CONSEQ_2;
ADC12CTL0 = ADC12ON+SHT0_15+MSC+REFON+REF2_5V;
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
break;
case 2:

ADC12CTL0 &= ~ADC12ON;
ADC12CTL0 &= ~ENC;
P6SEL |=0x04;
ADC12IE=0x04;
ADC12MCTL2=INCH_2;
ADC12MCTL2 = SREF_1;
ADC12CTL1 = CSTARTADD_2+SHP+CONSEQ_2;
ADC12CTL0 = ADC12ON+SHT0_15+MSC+REFON+REF2_5V;
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
break;
case 3:

ADC12CTL0 &= ~ADC12ON;
ADC12CTL0 &= ~ENC;
P6SEL |=0x08;
ADC12IE=0x08;
ADC12MCTL3=INCH_3;
ADC12MCTL3 = SREF_1;
ADC12CTL1 = CSTARTADD_3+SHP+CONSEQ_2;
ADC12CTL0 = ADC12ON+SHT0_3+MSC+REFON+REF2_5V;
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
break;
case 4:

ADC12CTL0 &= ~ADC12ON;
ADC12CTL0 &= ~ENC;
P6SEL |=0x10;
ADC12IE=0x10;
ADC12MCTL4=INCH_4;
ADC12MCTL4 = SREF_1;
ADC12CTL1 = CSTARTADD_4+SHP+CONSEQ_2;
ADC12CTL0 = ADC12ON+SHT0_3+MSC+REFON+REF2_5V;
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
break;
case 5:

ADC12CTL0 &= ~ADC12ON;
ADC12CTL0 &= ~ENC;
P6SEL |=0x20;
ADC12IE=0x20;
ADC12MCTL5=INCH_5;
ADC12MCTL5 = SREF_1;
ADC12CTL1 = CSTARTADD_5+SHP+CONSEQ_2;
ADC12CTL0 = ADC12ON+SHT0_3+MSC+REFON+REF2_5V;
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
break;
case 6:

ADC12CTL0 &= ~ADC12ON;
ADC12CTL0 &= ~ENC;
P6SEL |=0x40;
ADC12IE=0x40;
ADC12MCTL6=INCH_6;
ADC12MCTL6 = SREF_1;
ADC12CTL1 = CSTARTADD_6+SHP+CONSEQ_2;
ADC12CTL0 = ADC12ON+SHT0_3+MSC+REFON+REF2_5V;
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
break;
case 7:

ADC12CTL0 &= ~ADC12ON;
ADC12CTL0 &= ~ENC;
P6SEL |=0x80;
ADC12IE=0x80;
ADC12MCTL7=INCH_7;
ADC12MCTL7 = SREF_1;
ADC12CTL1 = CSTARTADD_7+SHP+CONSEQ_2;
ADC12CTL0 = ADC12ON+SHT0_3+MSC+REFON+REF2_5V;
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
break;
// case 8: init_ADC_full();
// break;
case 9:
putstring2("Stop");
break;
default:
putstring2("Error");
break;
}

}
//****************
#pragma vector=ADC_VECTOR
__interrupt void ADC12ISR(void)
{
switch (command)
{
case 0:
hexdata=ADC12MEM0;
trans(hexdata); //（这个trans程序是转换采样数据为实际模拟值并通过串口发送的子程序）
break;
case 1:
hexdata=ADC12MEM1;
trans(hexdata);
break;
case 2:
hexdata=ADC12MEM2;
trans(hexdata);
break;
case 3:
hexdata=ADC12MEM3;
trans(hexdata);
break;
case 4:
hexdata=ADC12MEM4;
trans(hexdata);
break;
case 5:
hexdata=ADC12MEM5;
trans(hexdata);
break;
case 6:
hexdata=ADC12MEM6;
trans(hexdata);
break;
case 7:
hexdata=ADC12MEM6;
trans(hexdata);
break;
// case 8: init_ADC_full();
// break;

}
}

1楼 chaoslogic 于 2011-03-20 11:20:10

各位高手~跪求帮助啊~

2楼 lvyunzeng 于 2011-03-21 09:37:05

ADC中断中调用的输出传输程序占用的时间太长，因此串口出现乱码。在中断中置标志位，主程序中作数据传输就好了！

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ADC12通道转换~严重困扰~请高人指点