F5310单片机的ADC采集实例讨论

只看该作者 · 2012-9-7 11:44

下边为TI官方ADC数据采集实例之一，为通过A11采集一电源电压AVCC
//******************************************************************************
//  MSP430F530x Demo - ADC10, Sample A11, Lo_Batt, Clear P1.0 if AVcc < 2.3V
//
//  Description: A single sample is made on A11 (AVcc/2) with reference to
//  internal 1.5V Vref. Software sets ADC10SC to start sample and conversion
//  - ADC10SC automatically cleared at EOC. ADC10 internal oscillator times
//  sample (16x) and conversion. ADC10BUSY flag is polled for EOC. If A11
//  (AVcc/2) < 0311h (1.15V) indicating AVcc is less 2.3V, P1.0 reset indicating
//  a lo_Batt condition, else set.
//  ACLK = n/a, MCLK = SMCLK = default DCO ~1.2MHz, ADC10CLK = ADC10OSC
//
//             MSP430F530x
//          -----------------
//       /|\|             XIN|-
//       | |                |
//       --|RST       XOUT|-
//          |                |
//          |A11 (AVcc/2) P1.0|-->LED
//
// B. Nisarga
// Texas Instruments Inc.
// Dec 2010
// Built with CCSv4.2 and IAR Embedded Workbench Version: 4.21
//******************************************************************************
#include <msp430f5310.h>
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT

  // Configure ADC10 - Pulse sample mode; ADC10SC trigger
  ADC10CTL0 = ADC10SHT_2 + ADC10ON;       // 16 ADC10CLKs; ADC ON
  ADC10CTL1 = ADC10SHP + ADC10CONSEQ_0;    // s/w trig, single ch/conv
  ADC10CTL2 = ADC10RES;                   // 10-bit conversion results
  ADC10MCTL0 = ADC10SREF_1 + ADC10INCH_11;  // AVcc/2

  // Configure internal reference
  while(REFCTL0 & REFGENBUSY);             // If ref generator busy, WAIT
  REFCTL0 |= REFVSEL_0+REFON;             // Select internal ref = 1.5V
                                          // Internal Reference ON
  __delay_cycles(75);                      // Delay (~75us) for Ref to settle

  P1DIR |= BIT0;                         // Set P1.0 to output direction
  P1OUT &= ~BIT0;                         // Clear P1.0
  while(1)
  {
ADC10CTL0 |= ADC10ENC + ADC10SC;       // Sampling and conversion start
while (ADC10CTL1 & ADC10BUSY);       // ADC10BUSY?
__no_operation();                      // For debug only
if (ADC10MEM0 < 0x311)                // is ADC10MEM = A11 > 1.15V?
   P1OUT &= ~BIT0;                      // Clear P1.0 LED off
else
   P1OUT |= BIT0;                      // Set P1.0 LED on
  }
}

现在我有几个疑问的请大家半忙解答下的啊：
（1）该采集电压信号的采集速率是多少？具体些的啊
（2）该ADC采集的时钟源是多少？
（3）我若想用A0 A1 A3 A5依次采集4路信号，该怎样配置相应的寄存器？具体些的啊
谢谢！