ADC12_A怎么使用TB0，自动启动AD转换？

你好，

    如果我没理解错的话楼主是想用TimerB来触发采样吧。我建议先调通ADC12模块，能够正常采到数据，这里可以参考430ware中的范例代码。然后再实现TimerB0的定时器中断，也可以参考430ware。

我的意思是不明白这个配置过程：

1、定时器寄存器都是有那些相关设置,只有找到一个OUTMOD设置

2、ADC寄存器相关的设置在哪里，只有找到一个使用ADC12SHS

还有没有其他需要设置的寄存器

了解，可以参考下面的代码，TB0触发ADC12采样，DMA转移采样结果，希望对你有帮助：

//******************************************************************************
// MSP430F532x Demo - DMA0, Single transfer using ADC12 triggered by TimerB
//
// Description: This software uses TBCCR1 as a sample and convert input into
// the A0 of ADC12. ADC12IFG is used to trigger a DMA transfer and DMA
// interrupt triggers when DMA transfer is done. TB1 is set as an output and
// P1.0 is toggled when DMA ISR is serviced.
// ACLK = REFO = 32kHz, MCLK = SMCLK = default DCO 1048576Hz
//
// MSP430F532x
// -----------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// | P1.0|-->LED
// | P5.7|-->TB1 output
// | |
// | P6.0|<--A0
//
// Bhargavi Nisarga
// Texas Instruments Inc.
// April 2009
// Built with CCSv4 and IAR Embedded Workbench Version: 4.21
//******************************************************************************

#include <msp430.h>

unsigned int DMA_DST; // ADC conversion result is stored in this variable

int main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Hold WDT

P1OUT &= ~BIT0; // P1.0 clear
P1DIR |= BIT0; // P1.0 output
P5SEL |= BIT7; // P5.7/TB1 option select
P5DIR |= BIT7; // Output direction
P6SEL |= BIT0; // Enable A/D channel A0

//Setup Timer B0
TBCCR0 = 0xFFFE;
TBCCR1 = 0x8000;
TBCCTL1 = OUTMOD_3; // CCR1 set/reset mode
TBCTL = TBSSEL_2+MC_1+TBCLR; // SMCLK, Up-Mode

// Setup ADC12
ADC12CTL0 = ADC12SHT0_15+ADC12MSC+ADC12ON;// Sampling time, MSC, ADC12 on
ADC12CTL1 = ADC12SHS_3+ADC12CONSEQ_2; // Use sampling timer; ADC12MEM0
// Sample-and-hold source = CCI0B =
// TBCCR1 output
// Repeated-single-channel
ADC12MCTL0 = ADC12SREF_0+ADC12INCH_0; // V+=AVcc V-=AVss, A0 channel
ADC12CTL0 |= ADC12ENC;

// Setup DMA0
DMACTL0 = DMA0TSEL_24; // ADC12IFGx triggered
DMACTL4 = DMARMWDIS; // Read-modify-write disable
DMA0CTL &= ~DMAIFG;
DMA0CTL = DMADT_4+DMAEN+DMADSTINCR_3+DMAIE; // Rpt single tranfer, inc dst, Int
DMA0SZ = 1; // DMA0 size = 1

__data16_write_addr((unsigned short) &DMA0SA,(unsigned long) &ADC12MEM0);
// Source block address
__data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &DMA_DST);
// Destination single address
__bis_SR_register(LPM0_bits + GIE); // LPM0 w/ interrupts
__no_operation(); // used for debugging
}

//------------------------------------------------------------------------------
// DMA Interrupt Service Routine
//------------------------------------------------------------------------------
#pragma vector=DMA_VECTOR
__interrupt void DMA_ISR(void)
{
switch(__even_in_range(DMAIV,16))
{
case 0: break;
case 2: // DMA0IFG = DMA Channel 0
P1OUT ^= BIT0; // Toggle P1.0 - PLACE BREAKPOINT HERE AND CHECK DMA_DST VARIABLE
break;
case 4: break; // DMA1IFG = DMA Channel 1
case 6: break; // DMA2IFG = DMA Channel 2
case 8: break; // DMA3IFG = DMA Channel 3
case 10: break; // DMA4IFG = DMA Channel 4
case 12: break; // DMA5IFG = DMA Channel 5
case 14: break; // DMA6IFG = DMA Channel 6
case 16: break; // DMA7IFG = DMA Channel 7
default: break;
}
}

i非常感谢你的代码，但是我配置之后，每一路AD采集值计算之后都是大体相同的，即使没有外加电流或电压信号，都会产生一个大体固定的数值，麻烦再指点一下吧

你好，

   你是使用上面的代码测试的吗？上面代码好像只有一个通道。如果楼主修改了代码，修改了那些地方？

  ADC12CTL1 &= ~ADC12SHP;
 ADC12CTL1 |= ADC12CONSEQ_1+ADC12SHS_2+ADC12SSEL_2+ADC12DIV_4;       // Use sampling timer, single sequence
     
void init_TB0(void)
{  
        TBCCTL0 = CCIE;         //Interrupt enable
        TB0CCR0 = 12500-1;    
        TB0CCTL0 = OUTMOD_4;
        TB0CTL |= TBSSEL_2 + MC_1 + TBCLR;
        
        
}

楼主，

    还没有调出来吗？你可以用前面发的那段代码先试一下 确认硬件OK之后再调软件。

请问，我现在要采集两路数据，采用定时器触发多通道ADC12采样，一路采集，DMA转移数据的话按照例子做到了；现在要做两路，查看手册：

When CONSEQx = {1,3}, the ADC12IFG flag for the last ADC12MEMx in the sequence can trigger a DMA transfer. Any ADC12IFG flag is automatically cleared when the DMA controller accesses the corresponding ADC12MEMx.

单路可以直接取：

__data16_write_addr((unsigned short) &DMA0SA,(unsigned long) &ADC12MEM0);
// Source block address
__data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &DMA_DST);

多路如何取采样值？难道要用多路DMA么