Marcelo Rebonatto / Mbed 2 deprecated PMED_Calibra

First Version

Dependencies:   EthernetInterface mbed-rtos mbed

Codes/Capture.cpp@0:9df41090ba33, 2015-07-21 (annotated)

Committer:
rebonatto
Date:
Tue Jul 21 21:29:49 2015 +0000
Revision:
0:9df41090ba33
Child:
2:bf4bbf7d6793
First Version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rebonatto 0:9df41090ba33 1 /*
rebonatto 0:9df41090ba33 2 * Capture.h
rebonatto 0:9df41090ba33 3 *
rebonatto 0:9df41090ba33 4 * Created on:
rebonatto 0:9df41090ba33 5 * Author:
rebonatto 0:9df41090ba33 6 */
rebonatto 0:9df41090ba33 7 #include "Capture.h"
rebonatto 0:9df41090ba33 8
rebonatto 0:9df41090ba33 9 Semaphore Capture::m_CaptureSemaphore(1); //used to alert the capture thread about a ready capture
rebonatto 0:9df41090ba33 10 int Capture::m_BufferIndex;
rebonatto 0:9df41090ba33 11 dmaLinkedListNode Capture::m_Nodes[2] __attribute__((section("AHBSRAM0"))); //this list holds the buffer configuration for the DMA peripheral
rebonatto 0:9df41090ba33 12 unsigned short int Capture::m_AdcBuffers[2][NUMBER_OF_SAMPLES][NUMBER_OF_CHANNELS] __attribute__((section("AHBSRAM0")));
rebonatto 0:9df41090ba33 13 Serial rfid_serial(p28,p27);
rebonatto 0:9df41090ba33 14
rebonatto 0:9df41090ba33 15 //This function prepares the capture buffers and starts the DMA peripheral
rebonatto 0:9df41090ba33 16 void Capture::Start()
rebonatto 0:9df41090ba33 17 {
rebonatto 0:9df41090ba33 18 m_Nodes[0].destAddr = (unsigned int)m_AdcBuffers[0];// HERE GOES THE BUFFER ADDRESS(unsigned int)adval;
rebonatto 0:9df41090ba33 19 m_Nodes[0].sourceAddr = (unsigned int)&LPC_ADC->ADGDR;
rebonatto 0:9df41090ba33 20 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 0:9df41090ba33 21 m_Nodes[0].nextNode = (unsigned int)&m_Nodes[1];
rebonatto 0:9df41090ba33 22
rebonatto 0:9df41090ba33 23 m_Nodes[1].destAddr = (unsigned int)m_AdcBuffers[1];// HERE GOES THE BUFFER ADDRESS(unsigned int)adval2;
rebonatto 0:9df41090ba33 24 m_Nodes[1].sourceAddr = (unsigned int)&LPC_ADC->ADGDR;
rebonatto 0:9df41090ba33 25 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 0:9df41090ba33 26 m_Nodes[1].nextNode = (unsigned int)&m_Nodes[0];
rebonatto 0:9df41090ba33 27
rebonatto 0:9df41090ba33 28 m_BufferIndex=0;
rebonatto 0:9df41090ba33 29
rebonatto 0:9df41090ba33 30 while(!(LPC_ADC->ADDR0&(1U<<31))); //waits the completion of the ADC Channel 0 capture - for synchronization purposes
rebonatto 0:9df41090ba33 31 while(!(LPC_ADC->ADDR0&(1U<<31))); //waits the completion of the ADC Channel 0 capture - for synchronization purposes
rebonatto 0:9df41090ba33 32
rebonatto 0:9df41090ba33 33 setup_channel(&m_Nodes[0],0,DMA_PERIPHERAL_ADC,DMA_MEMORY);
rebonatto 0:9df41090ba33 34 }
rebonatto 0:9df41090ba33 35
rebonatto 0:9df41090ba33 36 //This function initializes the ADC and DMA peripherals
rebonatto 0:9df41090ba33 37 void Capture::Initialize()
rebonatto 0:9df41090ba33 38 {
rebonatto 0:9df41090ba33 39 init_adc(Settings::get_FreqBase()*NUMBER_OF_SAMPLES*NUMBER_OF_CHANNELS);
rebonatto 0:9df41090ba33 40 select_channels(ADC_CH_0|ADC_CH_1|ADC_CH_2|ADC_CH_3|ADC_CH_4|ADC_CH_5);
rebonatto 0:9df41090ba33 41 LPC_ADC->ADCR |= ADC_MODE_BURST;
rebonatto 0:9df41090ba33 42
rebonatto 0:9df41090ba33 43 init_dma();
rebonatto 0:9df41090ba33 44
rebonatto 0:9df41090ba33 45 Start();
rebonatto 0:9df41090ba33 46
rebonatto 0:9df41090ba33 47 m_CaptureSemaphore.wait();
rebonatto 0:9df41090ba33 48 }
rebonatto 0:9df41090ba33 49
rebonatto 0:9df41090ba33 50 void Capture::Stop()
rebonatto 0:9df41090ba33 51 {
rebonatto 0:9df41090ba33 52 m_CaptureSemaphore.release(); //release semaphore
rebonatto 0:9df41090ba33 53 stop_channel();
rebonatto 0:9df41090ba33 54 }
rebonatto 0:9df41090ba33 55
rebonatto 0:9df41090ba33 56 void Capture::Wait()
rebonatto 0:9df41090ba33 57 {
rebonatto 0:9df41090ba33 58 m_CaptureSemaphore.wait(osWaitForever);
rebonatto 0:9df41090ba33 59 }
rebonatto 0:9df41090ba33 60
rebonatto 0:9df41090ba33 61 unsigned short int Capture::GetValue(int nsamples, int nchannel)
rebonatto 0:9df41090ba33 62 {
rebonatto 0:9df41090ba33 63 return ADC_CONVERT(m_AdcBuffers[m_BufferIndex][nsamples][nchannel]);
rebonatto 0:9df41090ba33 64 }
rebonatto 0:9df41090ba33 65
rebonatto 0:9df41090ba33 66 void Capture::CopyBuffer(int channel, unsigned short int *dest)
rebonatto 0:9df41090ba33 67 {
rebonatto 0:9df41090ba33 68 for(int i=0;i<Settings::get_Samples();i++)
rebonatto 0:9df41090ba33 69 {
rebonatto 0:9df41090ba33 70 dest[i] = GetValue(i,channel);
rebonatto 0:9df41090ba33 71 }
rebonatto 0:9df41090ba33 72 }
rebonatto 0:9df41090ba33 73
rebonatto 0:9df41090ba33 74 //DMA ISR signals the capture thread about the end of capture event
rebonatto 0:9df41090ba33 75 extern "C" void DMA_IRQHandler(void)
rebonatto 0:9df41090ba33 76 {
rebonatto 0:9df41090ba33 77 Capture::ISRHandler();
rebonatto 0:9df41090ba33 78 }
rebonatto 0:9df41090ba33 79
rebonatto 0:9df41090ba33 80 void Capture::ISRHandler()
rebonatto 0:9df41090ba33 81 {
rebonatto 0:9df41090ba33 82 Capture::m_BufferIndex = (~Capture::m_BufferIndex)&1;
rebonatto 0:9df41090ba33 83
rebonatto 0:9df41090ba33 84 Capture::m_CaptureSemaphore.release();
rebonatto 0:9df41090ba33 85 LPC_GPDMA->DMACIntTCClear = 0xFF;
rebonatto 0:9df41090ba33 86 }
rebonatto 0:9df41090ba33 87
rebonatto 0:9df41090ba33 88 void Capture::ReadRFID(int channel,char *rfid)
rebonatto 0:9df41090ba33 89 {
rebonatto 0:9df41090ba33 90
rebonatto 0:9df41090ba33 91 char cmd[4];
rebonatto 0:9df41090ba33 92 cmd[0] = 'S';
rebonatto 0:9df41090ba33 93 cmd[1] = '0'+channel;
rebonatto 0:9df41090ba33 94 cmd[2] = '\n';
rebonatto 0:9df41090ba33 95 cmd[3] = '\0';
rebonatto 0:9df41090ba33 96
rebonatto 0:9df41090ba33 97 //send
rebonatto 0:9df41090ba33 98 rfid_serial.puts(cmd);
rebonatto 0:9df41090ba33 99
rebonatto 0:9df41090ba33 100 //receive
rebonatto 0:9df41090ba33 101 char ch=0;
rebonatto 0:9df41090ba33 102 char ans[10];
rebonatto 0:9df41090ba33 103 int cnt=0;
rebonatto 0:9df41090ba33 104 int tmout=1000;
rebonatto 0:9df41090ba33 105 while(ch != '\n' && tmout-- && cnt<9)
rebonatto 0:9df41090ba33 106 {
rebonatto 0:9df41090ba33 107 if(rfid_serial.readable())
rebonatto 0:9df41090ba33 108 {
rebonatto 0:9df41090ba33 109 ch = rfid_serial.getc();
rebonatto 0:9df41090ba33 110 if(!((ch>='0' && ch<='9') || (ch >= 'A' && ch <= 'F')))ch='0';
rebonatto 0:9df41090ba33 111 ans[cnt++] = ch;
rebonatto 0:9df41090ba33 112 }
rebonatto 0:9df41090ba33 113 else
rebonatto 0:9df41090ba33 114 wait_ms(1);
rebonatto 0:9df41090ba33 115
rebonatto 0:9df41090ba33 116 }
rebonatto 0:9df41090ba33 117 ans[cnt-1] = '\0';
rebonatto 0:9df41090ba33 118 for(int i=0;i<9;i++)
rebonatto 0:9df41090ba33 119 rfid[i] = ans[i];
rebonatto 0:9df41090ba33 120
rebonatto 0:9df41090ba33 121 }