Versão atual 13-12-2013.
Dependencies: EthernetInterface mbed-rtos mbed
Codes/Capture.cpp
- Committer:
- rebonatto
- Date:
- 2013-12-13
- Revision:
- 1:238ac24e46dd
- Parent:
- 0:65c41a68b49a
File content as of revision 1:238ac24e46dd:
/* * Capture.h * * Created on: * Author: */ #include "Capture.h" Semaphore Capture::m_CaptureSemaphore(1); //used to alert the capture thread about a ready capture int Capture::m_BufferIndex; dmaLinkedListNode Capture::m_Nodes[2] __attribute__((section("AHBSRAM0"))); //this list holds the buffer configuration for the DMA peripheral unsigned short int Capture::m_AdcBuffers[2][NUMBER_OF_SAMPLES][NUMBER_OF_CHANNELS] __attribute__((section("AHBSRAM0"))); //This function prepares the capture buffers and starts the DMA peripheral void Capture::Start() { m_Nodes[0].destAddr = (unsigned int)m_AdcBuffers[0];// HERE GOES THE BUFFER ADDRESS(unsigned int)adval; m_Nodes[0].sourceAddr = (unsigned int)&LPC_ADC->ADGDR; m_Nodes[0].dmaControl = (NUMBER_OF_SAMPLES*NUMBER_OF_CHANNELS)| DMA_DST_WIDTH_HALFWORD | DMA_SRC_WIDTH_HALFWORD | DMA_DST_INCREMENT | DMA_TC_INT; m_Nodes[0].nextNode = (unsigned int)&m_Nodes[1]; m_Nodes[1].destAddr = (unsigned int)m_AdcBuffers[1];// HERE GOES THE BUFFER ADDRESS(unsigned int)adval2; m_Nodes[1].sourceAddr = (unsigned int)&LPC_ADC->ADGDR; m_Nodes[1].dmaControl = (NUMBER_OF_SAMPLES*NUMBER_OF_CHANNELS)| DMA_DST_WIDTH_HALFWORD | DMA_SRC_WIDTH_HALFWORD | DMA_DST_INCREMENT | DMA_TC_INT; m_Nodes[1].nextNode = (unsigned int)&m_Nodes[0]; m_BufferIndex=0; while(!(LPC_ADC->ADDR0&(1U<<31))); //waits the completion of the ADC Channel 0 capture - for synchronization purposes while(!(LPC_ADC->ADDR0&(1U<<31))); //waits the completion of the ADC Channel 0 capture - for synchronization purposes setup_channel(&m_Nodes[0],0,DMA_PERIPHERAL_ADC,DMA_MEMORY); } //This function initializes the ADC and DMA peripherals void Capture::Initialize() { init_adc(Settings::get_FreqBase()*NUMBER_OF_SAMPLES*NUMBER_OF_CHANNELS); select_channels(ADC_CH_0|ADC_CH_1|ADC_CH_2|ADC_CH_3|ADC_CH_4|ADC_CH_5); LPC_ADC->ADCR |= ADC_MODE_BURST; init_dma(); Start(); m_CaptureSemaphore.wait(); } void Capture::Stop() { m_CaptureSemaphore.release(); //release semaphore stop_channel(); } void Capture::Wait() { m_CaptureSemaphore.wait(osWaitForever); } unsigned short int Capture::GetValue(int nsamples, int nchannel) { return ADC_CONVERT(m_AdcBuffers[m_BufferIndex][nsamples][nchannel]); } void Capture::CopyBuffer(int channel, unsigned short int *dest) { for(int i=0;i<Settings::get_Samples();i++) { dest[i] = GetValue(i,channel); } } //DMA ISR signals the capture thread about the end of capture event extern "C" void DMA_IRQHandler(void) { Capture::ISRHandler(); } void Capture::ISRHandler() { Capture::m_BufferIndex = (~Capture::m_BufferIndex)&1; Capture::m_CaptureSemaphore.release(); LPC_GPDMA->DMACIntTCClear = 0xFF; }