使用KL25板卡实现的4路ADC采用例程-模数转换

digua96 · 发表于 2015-6-8 13:09:36

下面是之前采用KL25板卡设计的4路模拟量采集的初始化程序，此采集是为采集交流电量所用：
采集50hz的交流信号，每一个周波采集64点，采集是4路模拟量放入四个数组中，供程序的其它算法使用。
程序流程：64点每个点的触发采集是通过定时器来实现采样频率，每个通道是通过软件触发的方式实现AD触发；
大家有更好的多路采集思路望多多提建议，谢谢。
把相关的程序段复制过来，存在不足，多多指教。
#include "vectors.h"
#include <MATH.H>

#ifdef CMSIS
#include "start.h"
#endif

#define NUM_caiy  64    //采集点数
#define NUM_channel  2    //采集通道数

float  dataR[64];
float  U11,U12,I11,FFT_I1,FFT_I0,FFT_I2,correct_xi=0;

uint32 i2[3][NUM_caiy]={0},i10=0;    //i10基准电压值
uint8 ii=0,ii1=0; //ii:通道号,ii1:采集点号
uint8 correct_i=1;
void Port_int()
{
   PORTB_PCR18 |= PORT_PCR_MUX(1);//
   PORTB_PCR19 |= PORT_PCR_MUX(1);//
   PORTD_PCR1  |= PORT_PCR_MUX(1);//  ???

GPIOB_PDDR |= (1<<18) |(1<<19);//??
GPIOD_PDDR |= (1<<1);       //??

   //PORTE_PCR0 |= PORT_PCR_MUX(4);// RTC-CLKOUT
   //PORTC_PCR3 |= PORT_PCR_MUX(5);//

PORTB_PCR3 &= ~PORT_PCR_MUX_MASK; // analog  SE13
   PORTB_PCR2 &= ~PORT_PCR_MUX_MASK; // SE12
PORTB_PCR1 &= ~PORT_PCR_MUX_MASK; // SE9
PORTB_PCR0 &= ~PORT_PCR_MUX_MASK; // SE8

//PORTB_PCR3 |= PORT_PCR_MUX(0);//

}
void SIM_MCG_int()
{
//MCG_C1       |=MCG_C1_IRCLKEN_MASK ;             //ENABLE MCGIRCLE
   SIM_SOPT2    |=SIM_SOPT2_CLKOUTSEL(8)//;       //7LPO clock 8MCGIRCLK 10 OSCERCLK  CLKOUT
                  |SIM_SOPT2_RTCCLKOUTSEL_MASK;    //0 RTC1Hz 1 OSCERCLK          RTC-CLKOUT

//SIM_SOPT1    |=SIM_SOPT1_OSC32KSEL(0);       //0 osc32kclk 2 rtc-clkin 3lpo-1khz

   SIM_SCGC5    |=SIM_SCGC5_LPTMR_MASK;             //Low Power Timer Access Control
   SIM_SCGC6    |=SIM_SCGC6_ADC0_MASK; //ADC0 gate

   //SIM_SOPT7    |=(SIM_SOPT7_ADC0ALTTRGEN_MASK //enable alternative conversion triggers
                  // |SIM_SOPT7_ADC0TRGSEL(14));       //trigger select LPTMR0
}
/********************************************************************/
void LTimer_int()
{
   OSC0_CR    |=OSC_CR_ERCLKEN_MASK;          //3 OSCERCLK ENABLE

      LPTMR0_CSR |=(LPTMR_CSR_TCF_MASK
                  |LPTMR_CSR_TIE_MASK);       //interrupt enable
       LPTMR0_PSR |=(LPTMR_PSR_PRESCALE(7 )    //divides  PBYP?1??
                  |LPTMR_PSR_PBYP_MASK
                  |LPTMR_PSR_PCS(3));          //0 MCGIRCLE-48M 1LPO-1K 2ERCLK32-? 3OSCERCLK-8M

      LPTMR0_CMR    |=LPTMR_CMR_COMPARE(2500) ;    //32000_7-1s  2500_0-3200hz

   LPTMR0_CSR    |=LPTMR_CSR_TEN_MASK;       //timer enable ?????? */

enable_irq(LPTMR_irq_no);
enable_irq(ADC0_irq_no);
   EnableInterrupts;
}
void Adc0_int()
{
ADC0_SC1A    &=~ADC_SC1_ADCH_MASK;
ADC0_CFG1    |=ADC_CFG1_ADICLK(1)             //clock divide select  bus clock 24M
|ADC_CFG1_ADLSMP_MASK //long sample time
|ADC_CFG1_MODE(3)       //conversion 8 12 10 16
|ADC_CFG1_ADIV(1);          // clock divide 1 2 4 8
ADC0_CFG2    |=ADC_CFG2_ADHSC_MASK//;          //high-speed conversion
//|ADC_CFG2_MUXSEL_MASK          //0 channel a 1 channel b
|ADC_CFG2_ADLSTS(0);             //1  long sample time select 20 12 6 2
ADC0_SC2    |=ADC_SC2_REFSEL(0) ; //voltage reference
//|ADC_SC2_ADTRG_MASK; //hardware trigger
ADC0_SC3    |=//ADC_SC3_ADCO_MASK//;          //continuous conversion
ADC_SC3_AVGE_MASK                //hardware average enable
|ADC_SC3_AVGS(0) ; //Hardware average
ADC0_SC1A    |=(ADC_SC1_ADCH(8) //);                //channel select
|ADC_SC1_AIEN_MASK);          //ENABLE interrupt
}

void LPTimer_IRQHandler(void)
{
uint32 a=0;
   LPTMR0_CSR |=LPTMR_CSR_TCF_MASK ;
a=ADC0_SC1A&(~ADC_SC1_ADCH_MASK);
a|=ADC_SC1_ADCH(8);
   ADC0_SC1A          =a;
ii=0;
if(ii1==NUM_caiy)
{ii1=1;}
else
   {ii1++;}
//GPIOB_PTOR=(1<<18);
}

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