172 lines
6.6 KiB
C
172 lines
6.6 KiB
C
/*!
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*****************************************************************************
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@file: AD5940Main.c
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@author: Neo Xu
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@brief: Example of ramp test for electro-chemical sensor.
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-----------------------------------------------------------------------------
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Copyright (c) 2017-2019 Analog Devices, Inc. All Rights Reserved.
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This software is proprietary to Analog Devices, Inc. and its licensors.
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By using this software you agree to the terms of the associated
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Analog Devices Software License Agreement.
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*****************************************************************************/
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#include "RampTest.h"
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/**
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User could configure following parameters
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**/
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#define APPBUFF_SIZE 1024
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uint32_t AppBuff[APPBUFF_SIZE];
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float LFOSCFreq; /* Measured LFOSC frequency */
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/**
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* @brief An example to deal with data read back from AD5940. Here we just print data to UART
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* @note UART has limited speed, it has impact when sample rate is fast. Try to print some of the data not all of them.
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* @param pData: the buffer stored data for this application. The data from FIFO has been pre-processed.
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* @param DataCount: The available data count in buffer pData.
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* @return return 0.
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*/
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static int32_t RampShowResult(float *pData, uint32_t DataCount)
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{
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static uint32_t index;
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/* Print data*/
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for(int i=0;i<DataCount;i++)
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{
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printf("index:%d, %.3f\n", index++, pData[i]);
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//i += 10; /* Print though UART consumes too much time. */
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}
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return 0;
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}
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/**
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* @brief The general configuration to AD5940 like FIFO/Sequencer/Clock.
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* @note This function will firstly reset AD5940 using reset pin.
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* @return return 0.
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*/
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static int32_t AD5940PlatformCfg(void)
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{
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CLKCfg_Type clk_cfg;
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SEQCfg_Type seq_cfg;
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FIFOCfg_Type fifo_cfg;
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AGPIOCfg_Type gpio_cfg;
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LFOSCMeasure_Type LfoscMeasure;
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/* Use hardware reset */
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AD5940_HWReset();
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AD5940_Initialize(); /* Call this right after AFE reset */
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/* Platform configuration */
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/* Step1. Configure clock */
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clk_cfg.HFOSCEn = bTRUE;
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clk_cfg.HFXTALEn = bFALSE;
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clk_cfg.LFOSCEn = bTRUE;
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clk_cfg.HfOSC32MHzMode = bFALSE;
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clk_cfg.SysClkSrc = SYSCLKSRC_HFOSC;
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clk_cfg.SysClkDiv = SYSCLKDIV_1;
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clk_cfg.ADCCLkSrc = ADCCLKSRC_HFOSC;
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clk_cfg.ADCClkDiv = ADCCLKDIV_1;
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AD5940_CLKCfg(&clk_cfg);
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/* Step2. Configure FIFO and Sequencer*/
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/* Configure FIFO and Sequencer */
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fifo_cfg.FIFOEn = bTRUE; /* We will enable FIFO after all parameters configured */
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fifo_cfg.FIFOMode = FIFOMODE_FIFO;
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fifo_cfg.FIFOSize = FIFOSIZE_2KB; /* 2kB for FIFO, The reset 4kB for sequencer */
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fifo_cfg.FIFOSrc = FIFOSRC_SINC3; /* */
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fifo_cfg.FIFOThresh = 4; /* Don't care, set it by application paramter */
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AD5940_FIFOCfg(&fifo_cfg);
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seq_cfg.SeqMemSize = SEQMEMSIZE_4KB; /* 4kB SRAM is used for sequencer, others for data FIFO */
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seq_cfg.SeqBreakEn = bFALSE;
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seq_cfg.SeqIgnoreEn = bTRUE;
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seq_cfg.SeqCntCRCClr = bTRUE;
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seq_cfg.SeqEnable = bFALSE;
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seq_cfg.SeqWrTimer = 0;
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AD5940_SEQCfg(&seq_cfg);
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/* Step3. Interrupt controller */
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AD5940_INTCCfg(AFEINTC_1, AFEINTSRC_ALLINT, bTRUE); /* Enable all interrupt in INTC1, so we can check INTC flags */
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AD5940_INTCClrFlag(AFEINTSRC_ALLINT);
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AD5940_INTCCfg(AFEINTC_0, AFEINTSRC_DATAFIFOTHRESH|AFEINTSRC_ENDSEQ|AFEINTSRC_CUSTOMINT0, bTRUE);
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AD5940_INTCClrFlag(AFEINTSRC_ALLINT);
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/* Step4: Configure GPIO */
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gpio_cfg.FuncSet = GP0_INT|GP1_SLEEP|GP2_SYNC; /* GPIO1 indicates AFE is in sleep state. GPIO2 indicates ADC is sampling. */
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gpio_cfg.InputEnSet = 0;
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gpio_cfg.OutputEnSet = AGPIO_Pin0|AGPIO_Pin1|AGPIO_Pin2;
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gpio_cfg.OutVal = 0;
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gpio_cfg.PullEnSet = 0;
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AD5940_AGPIOCfg(&gpio_cfg);
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/* Measure LFOSC frequency */
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/**@note Calibrate LFOSC using system clock. The system clock accuracy decides measurement accuracy. Use XTAL to get better result. */
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LfoscMeasure.CalDuration = 1000.0; /* 1000ms used for calibration. */
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LfoscMeasure.CalSeqAddr = 0; /* Put sequence commands from start address of SRAM */
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LfoscMeasure.SystemClkFreq = 16000000.0f; /* 16MHz in this firmware. */
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AD5940_LFOSCMeasure(&LfoscMeasure, &LFOSCFreq);
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printf("LFOSC Freq:%f\n", LFOSCFreq);
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AD5940_SleepKeyCtrlS(SLPKEY_UNLOCK); /* */
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return 0;
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}
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/**
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* @brief The interface for user to change application paramters.
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* @return return 0.
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*/
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void AD5940RampStructInit(void)
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{
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AppRAMPCfg_Type *pRampCfg;
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AppRAMPGetCfg(&pRampCfg);
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/* Step1: configure general parmaters */
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pRampCfg->SeqStartAddr = 0x10; /* leave 16 commands for LFOSC calibration. */
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pRampCfg->MaxSeqLen = 1024-0x10; /* 4kB/4 = 1024 */
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pRampCfg->RcalVal = 10000.0; /* 10kOhm RCAL */
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pRampCfg->ADCRefVolt = 1820.0f; /* The real ADC reference voltage. Measure it from capacitor C12 with DMM. */
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pRampCfg->FifoThresh = 480; /* Maximum value is 2kB/4-1 = 512-1. Set it to higher value to save power. */
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pRampCfg->SysClkFreq = 16000000.0f; /* System clock is 16MHz by default */
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pRampCfg->LFOSCClkFreq = LFOSCFreq; /* LFOSC frequency */
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/* Configure ramp signal parameters */
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pRampCfg->RampStartVolt = -1000.0f; /* -1V */
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pRampCfg->RampPeakVolt = +1000.0f; /* +1V */
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pRampCfg->VzeroStart = 1300.0f; /* 1.3V */
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pRampCfg->VzeroPeak = 1300.0f; /* 1.3V */
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pRampCfg->StepNumber = 800; /* Total steps. Equals to ADC sample number */
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pRampCfg->RampDuration = 24*1000; /* X * 1000, where x is total duration of ramp signal. Unit is ms. */
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pRampCfg->SampleDelay = 7.0f; /* 7ms. Time between update DAC and ADC sample. Unit is ms. */
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pRampCfg->LPTIARtiaSel = LPTIARTIA_4K; /* Maximum current decides RTIA value */
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pRampCfg->LPTIARloadSel = LPTIARLOAD_SHORT;
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pRampCfg->AdcPgaGain = ADCPGA_1P5;
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}
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void AD5940_Main(void)
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{
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uint32_t temp;
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AppRAMPCfg_Type *pRampCfg;
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AD5940PlatformCfg();
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AD5940RampStructInit();
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AppRAMPInit(AppBuff, APPBUFF_SIZE); /* Initialize RAMP application. Provide a buffer, which is used to store sequencer commands */
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AppRAMPCtrl(APPCTRL_START, 0); /* Control IMP measurement to start. Second parameter has no meaning with this command. */
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while(1)
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{
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AppRAMPGetCfg(&pRampCfg);
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if(AD5940_GetMCUIntFlag())
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{
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AD5940_ClrMCUIntFlag();
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temp = APPBUFF_SIZE;
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AppRAMPISR(AppBuff, &temp);
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RampShowResult((float*)AppBuff, temp);
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}
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/* Repeat Measurement continuously*/
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if(pRampCfg->bTestFinished ==bTRUE)
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{
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AD5940_Delay10us(200000);
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pRampCfg->bTestFinished = bFALSE;
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AD5940_SEQCtrlS(bTRUE); /* Enable sequencer, and wait for trigger */
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AppRAMPCtrl(APPCTRL_START, 0);
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}
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}
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}
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