Marcelo Rebonatto / Mbed 2 deprecated PM_COPIA

Versão atual 13-12-2013.

Dependencies:   EthernetInterface mbed-rtos mbed

Codes/Capture.cpp@1:238ac24e46dd, 2013-12-13 (annotated)

Committer:
rebonatto
Date:
Fri Dec 13 11:45:06 2013 +0000
Revision:
1:238ac24e46dd
Parent:
0:65c41a68b49a 
Atual 13-12-2013.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rebonatto 0:65c41a68b49a 1 /*
rebonatto 0:65c41a68b49a 2 * Capture.h
rebonatto 0:65c41a68b49a 3 *
rebonatto 0:65c41a68b49a 4 * Created on:
rebonatto 0:65c41a68b49a 5 * Author:
rebonatto 0:65c41a68b49a 6 */
rebonatto 0:65c41a68b49a 7 #include "Capture.h"
rebonatto 0:65c41a68b49a 8
rebonatto 0:65c41a68b49a 9 Semaphore Capture::m_CaptureSemaphore(1); //used to alert the capture thread about a ready capture
rebonatto 0:65c41a68b49a 10 int Capture::m_BufferIndex;
rebonatto 0:65c41a68b49a 11 dmaLinkedListNode Capture::m_Nodes[2] __attribute__((section("AHBSRAM0"))); //this list holds the buffer configuration for the DMA peripheral
rebonatto 0:65c41a68b49a 12 unsigned short int Capture::m_AdcBuffers[2][NUMBER_OF_SAMPLES][NUMBER_OF_CHANNELS] __attribute__((section("AHBSRAM0")));
rebonatto 0:65c41a68b49a 13
rebonatto 0:65c41a68b49a 14 //This function prepares the capture buffers and starts the DMA peripheral
rebonatto 0:65c41a68b49a 15 void Capture::Start()
rebonatto 0:65c41a68b49a 16 {
rebonatto 0:65c41a68b49a 17 m_Nodes[0].destAddr = (unsigned int)m_AdcBuffers[0];// HERE GOES THE BUFFER ADDRESS(unsigned int)adval;
rebonatto 0:65c41a68b49a 18 m_Nodes[0].sourceAddr = (unsigned int)&LPC_ADC->ADGDR;
rebonatto 0:65c41a68b49a 19 m_Nodes[0].dmaControl = (NUMBER_OF_SAMPLES*NUMBER_OF_CHANNELS)| DMA_DST_WIDTH_HALFWORD | DMA_SRC_WIDTH_HALFWORD | DMA_DST_INCREMENT | DMA_TC_INT;
rebonatto 0:65c41a68b49a 20 m_Nodes[0].nextNode = (unsigned int)&m_Nodes[1];
rebonatto 0:65c41a68b49a 21
rebonatto 0:65c41a68b49a 22 m_Nodes[1].destAddr = (unsigned int)m_AdcBuffers[1];// HERE GOES THE BUFFER ADDRESS(unsigned int)adval2;
rebonatto 0:65c41a68b49a 23 m_Nodes[1].sourceAddr = (unsigned int)&LPC_ADC->ADGDR;
rebonatto 0:65c41a68b49a 24 m_Nodes[1].dmaControl = (NUMBER_OF_SAMPLES*NUMBER_OF_CHANNELS)| DMA_DST_WIDTH_HALFWORD | DMA_SRC_WIDTH_HALFWORD | DMA_DST_INCREMENT | DMA_TC_INT;
rebonatto 0:65c41a68b49a 25 m_Nodes[1].nextNode = (unsigned int)&m_Nodes[0];
rebonatto 0:65c41a68b49a 26
rebonatto 0:65c41a68b49a 27 m_BufferIndex=0;
rebonatto 0:65c41a68b49a 28
rebonatto 0:65c41a68b49a 29 while(!(LPC_ADC->ADDR0&(1U<<31))); //waits the completion of the ADC Channel 0 capture - for synchronization purposes
rebonatto 0:65c41a68b49a 30 while(!(LPC_ADC->ADDR0&(1U<<31))); //waits the completion of the ADC Channel 0 capture - for synchronization purposes
rebonatto 0:65c41a68b49a 31
rebonatto 0:65c41a68b49a 32 setup_channel(&m_Nodes[0],0,DMA_PERIPHERAL_ADC,DMA_MEMORY);
rebonatto 0:65c41a68b49a 33 }
rebonatto 0:65c41a68b49a 34
rebonatto 0:65c41a68b49a 35 //This function initializes the ADC and DMA peripherals
rebonatto 0:65c41a68b49a 36 void Capture::Initialize()
rebonatto 0:65c41a68b49a 37 {
rebonatto 0:65c41a68b49a 38 init_adc(Settings::get_FreqBase()*NUMBER_OF_SAMPLES*NUMBER_OF_CHANNELS);
rebonatto 0:65c41a68b49a 39 select_channels(ADC_CH_0|ADC_CH_1|ADC_CH_2|ADC_CH_3|ADC_CH_4|ADC_CH_5);
rebonatto 0:65c41a68b49a 40 LPC_ADC->ADCR |= ADC_MODE_BURST;
rebonatto 0:65c41a68b49a 41
rebonatto 0:65c41a68b49a 42 init_dma();
rebonatto 0:65c41a68b49a 43
rebonatto 0:65c41a68b49a 44 Start();
rebonatto 0:65c41a68b49a 45
rebonatto 0:65c41a68b49a 46 m_CaptureSemaphore.wait();
rebonatto 0:65c41a68b49a 47 }
rebonatto 0:65c41a68b49a 48
rebonatto 0:65c41a68b49a 49 void Capture::Stop()
rebonatto 0:65c41a68b49a 50 {
rebonatto 0:65c41a68b49a 51 m_CaptureSemaphore.release(); //release semaphore
rebonatto 0:65c41a68b49a 52 stop_channel();
rebonatto 0:65c41a68b49a 53 }
rebonatto 0:65c41a68b49a 54
rebonatto 0:65c41a68b49a 55 void Capture::Wait()
rebonatto 0:65c41a68b49a 56 {
rebonatto 0:65c41a68b49a 57 m_CaptureSemaphore.wait(osWaitForever);
rebonatto 0:65c41a68b49a 58 }
rebonatto 0:65c41a68b49a 59
rebonatto 0:65c41a68b49a 60 unsigned short int Capture::GetValue(int nsamples, int nchannel)
rebonatto 0:65c41a68b49a 61 {
rebonatto 0:65c41a68b49a 62 return ADC_CONVERT(m_AdcBuffers[m_BufferIndex][nsamples][nchannel]);
rebonatto 0:65c41a68b49a 63 }
rebonatto 0:65c41a68b49a 64
rebonatto 0:65c41a68b49a 65 void Capture::CopyBuffer(int channel, unsigned short int *dest)
rebonatto 0:65c41a68b49a 66 {
rebonatto 0:65c41a68b49a 67 for(int i=0;i<Settings::get_Samples();i++)
rebonatto 0:65c41a68b49a 68 {
rebonatto 0:65c41a68b49a 69 dest[i] = GetValue(i,channel);
rebonatto 0:65c41a68b49a 70 }
rebonatto 0:65c41a68b49a 71 }
rebonatto 0:65c41a68b49a 72
rebonatto 0:65c41a68b49a 73 //DMA ISR signals the capture thread about the end of capture event
rebonatto 0:65c41a68b49a 74 extern "C" void DMA_IRQHandler(void)
rebonatto 0:65c41a68b49a 75 {
rebonatto 0:65c41a68b49a 76 Capture::ISRHandler();
rebonatto 0:65c41a68b49a 77 }
rebonatto 0:65c41a68b49a 78
rebonatto 0:65c41a68b49a 79 void Capture::ISRHandler()
rebonatto 0:65c41a68b49a 80 {
rebonatto 0:65c41a68b49a 81 Capture::m_BufferIndex = (~Capture::m_BufferIndex)&1;
rebonatto 0:65c41a68b49a 82
rebonatto 0:65c41a68b49a 83 Capture::m_CaptureSemaphore.release();
rebonatto 0:65c41a68b49a 84 LPC_GPDMA->DMACIntTCClear = 0xFF;
rebonatto 0:65c41a68b49a 85 }