Posted on November 07, 2014 at 12:30
Hi there, I'm trying to use two ADC channels and send them to array via DMA.
Here is my code.
void
ADC_Config (
void
){
//Rozdzielczosc 12 bitow,
//Wyrownanie bitow do prawej
ADC->CCR |= ADC_CCR_ADCPRE_0 | ADC_CCR_ADCPRE_1;
//PCLK2/8=72MHz/8=9 MHz;
ADC1->CR1 = ADC_CR1_SCAN;
//Scan mode Enable (do wykonania pomariu z kilku kanalow)
ADC1->CR2 = ADC_CR2_CONT;
//Pomiar ciagly
ADC1->SQR1|= ADC_SQR1_L_1;
// wybor liczby pomiarow (2)
ADC1->SQR3 = ADC_SQR3_SQ1_1 | ADC_SQR3_SQ1_3;
//Jako pierwszy pomiar wykonany jest na kanale 10
ADC1->SQR3|= ADC_SQR3_SQ2_4;
//Jako drugi pomiar - kanal 16 (termometr)
/*The temperature sensor, VREFINT and the VBAT channel are available only on the master
ADC1 peripheral*/
//3 cykle dla kanalu 10
ADC1->SMPR1 |= ADC_SMPR1_SMP16_0 | ADC_SMPR1_SMP16_1 | ADC_SMPR1_SMP16_2;
//480 cykli dla kanalu 16;
ADC1->CR2|= ADC_CR2_DMA;
//Wlaczenie DMA
ADC->CCR |= ADC_CCR_TSVREFE;
//Odpalenie termometru
ADC1->CR2 |= ADC_CR2_ADON;
//Wlaczenie ADC1
//Kalibracja automatyczna
}
void
DMA_Config (
void
){
DMA2_Stream4->CR = 0;
//Wylacz Stream4 dla DM2
while
(DMA2_Stream4->CR & DMA_SxCR_EN);
//Czekaj tak dlugo, az bit EN=0.
DMA2_Stream4->PAR = ADC1_DR_Address;
//Adres docelowy
DMA2_Stream4->M0AR = (unsigned
int
)buforADC;
//buforADC to tablica z wartosciami do przeslania
DMA2_Stream4->NDTR=2;
//Rozmiar przesylanej tablicy to 2
//ADC1 jest zglaszane na kanale 0
DMA2_Stream4->CR |= DMA_SxCR_PL_1;
//Ustawienie priorytetu na wysoki
//Kierunek przesylania danych: pamiec -> peryferia
DMA2_Stream4->CR |= DMA_SxCR_MINC;
// Autoinkrementacja pamieci (kolejne wartosci z tablicy)
DMA2_Stream4->CR |= DMA_SxCR_CIRC;
//Circular mode
DMA2_Stream4->CR |= DMA_SxCR_PSIZE_0 ;
//Half-word dla peryferiow
DMA2_Stream4->CR |= DMA_SxCR_MSIZE_0;
//Half-word dla pamieci
DMA2_Stream4->CR |= DMA_SxCR_EN;
//Enable Stream5
}
////////////////////////////////////////////////////////////////////////
//
piece of main
ADC1->CR2 |= ADC_CR2_SWSTART;
//ADC enable
ADC1->CR2 |= ADC_CR2_DDS;
while
(1){
napiecie = buforADC[0] * 8059/10000;
temperatura = (1430 - buforADC[1] * 8059/10000)*10/43+25; Delay(50);
}
My problem is that values from buforADC[0] and buforADC[1] are mixing.Sometimes buforADC[1] has the value from buforADC[0] and so on..
I coulnd't find any solution on polish forums, so I try here. Sorry forry my poor english, hope to get some answers!
Cheers!
