F5529的DMA采集ADC问题

2019-03-23 22:23发布

站内问答 / TI MCU

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刚用了一下TI的DMA采集ADC的例程，发现，不能使用，无法进入DMA中断，因此采不到数据，有解决办法吗？代码如下：

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* Copyright (c) 2017, Texas Instruments Incorporated
* All rights reserved.
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*
* * Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* --/COPYRIGHT--*/
//******************************************************************************
//!
//! DMA - Single Transfer using ADC12 trigger by TIMER_A, on Channel 0
//!
//! This software uses TBCCR1 as a sample and convert input into the A0 of
//! ADC12. ADC12IFG is used to trigger a DMA transfer and DMA interrupt
//! triggers when DMA transfer is done. TB1 is set as an output and P1.0 is
//! toggled when DMA ISR is serviced.
//! ACLK = REFO = 32kHz, MCLK = SMCLK = default DCO 1048576Hz
//!
//! MSP430F552x
//! -----------------
//! /|| XIN|-
//! | | | 32kHz
//! --|RST XOUT|-
//! | |
//! | P1.0|-> LED
//! | P5.7/TB1|-> TIMER_A_B1 output
//! | P6.0/A0|<- A0
//! | |
//!
//!
//! This example uses the following peripherals and I/O signals. You must
//! review these and change as needed for your own board:
//! - DMA peripheral
//! - ADC12 peripheral
//! - GPIO Port peripheral
//! - A0
//!
//! This example uses the following interrupt handlers. To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - DMA_VECTOR
//!
//******************************************************************************
#include "driverlib.h"
//ADC conversion result is stored in this variable
uint16_t DMA_DST;
void main (void)
{
//Stop Watchdog Timer
WDT_A_hold(WDT_A_BASE);
//Clear P1.0 LED off
GPIO_setOutputLowOnPin(
GPIO_PORT_P1,
GPIO_PIN0
);
//Set P1.0 to output direction
GPIO_setAsOutputPin(
GPIO_PORT_P1,
GPIO_PIN0
);
//P5.7/TB1 option select Output direction
GPIO_setAsPeripheralModuleFunctionOutputPin(
GPIO_PORT_P5,
GPIO_PIN7
);
//Enable A/D channel A0
GPIO_setAsPeripheralModuleFunctionInputPin(
GPIO_PORT_P6,
GPIO_PIN0
);
//Set up Timer A
Timer_A_initCompareModeParam initCompParam = {0};
initCompParam.compareRegister = TIMER_A_CAPTURECOMPARE_REGISTER_1;
initCompParam.compareInterruptEnable = TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE;
initCompParam.compareOutputMode = TIMER_A_OUTPUTMODE_RESET_SET;
initCompParam.compareValue = 0x8000;
Timer_A_initCompareMode(TIMER_A0_BASE, &initCompParam);
//Start timer A0
Timer_A_initUpDownModeParam initUpDownParam = {0};
initUpDownParam.clockSource = TIMER_A_CLOCKSOURCE_SMCLK;
initUpDownParam.clockSourceDivider = TIMER_A_CLOCKSOURCE_DIVIDER_1;
initUpDownParam.timerPeriod = 0xFFFE;
initUpDownParam.timerInterruptEnable_TAIE = TIMER_A_TAIE_INTERRUPT_DISABLE;
initUpDownParam.captureCompareInterruptEnable_CCR0_CCIE =
TIMER_A_CCIE_CCR0_INTERRUPT_DISABLE;
initUpDownParam.timerClear = TIMER_A_DO_CLEAR;
initUpDownParam.startTimer = true;
Timer_A_initUpDownMode(TIMER_A0_BASE, &initUpDownParam);
//Initialize and setup the ADC12 Module
/*
* Base Address of the ADC12 Module
* Use internal ADC12 bit as sample/hold signal to start conversion
* USE MODOSC 5MHZ Digital Oscillator as clock source
* Use default clock divider of 1
*/
ADC12_A_init(ADC12_A_BASE,
ADC12_A_SAMPLEHOLDSOURCE_3,
ADC12_A_CLOCKSOURCE_ADC12OSC,
ADC12_A_CLOCKDIVIDER_1);
ADC12_A_enable(ADC12_A_BASE);
/*
* Base Address of the ADC12 Module
* For memory buffers 0-7 sample/hold for 256 clock cycles
* For memory buffers 8-15 sample/hold for 4 clock cycles (default)
* Enable Multiple Sampling
*/
ADC12_A_setupSamplingTimer(ADC12_A_BASE,
ADC12_A_CYCLEHOLD_128_CYCLES,
ADC12_A_CYCLEHOLD_4_CYCLES,
ADC12_A_MULTIPLESAMPLESENABLE);
//Configure Memory Buffer
/*
* Base Address of the ADC12 Module
* Configure memory buffer 0
* Map input A0 to memory buffer 0
* Vref+ = AVcc
* Vref- = AVss
* Memory buffer 0 is not the end of a sequence
*/
ADC12_A_configureMemoryParam configureMemoryParam = {0};
configureMemoryParam.memoryBufferControlIndex = ADC12_A_MEMORY_0;
configureMemoryParam.inputSourceSelect = ADC12_A_INPUT_A0;
configureMemoryParam.positiveRefVoltageSourceSelect = ADC12_A_VREFPOS_AVCC;
configureMemoryParam.negativeRefVoltageSourceSelect = ADC12_A_VREFNEG_AVSS;
configureMemoryParam.endOfSequence = ADC12_A_NOTENDOFSEQUENCE;
ADC12_A_configureMemory(ADC12_A_BASE ,&configureMemoryParam);
//Enable/Start sampling and conversion
/*
* Base Address of the ADC12 Module
* Start the conversion into memory buffer 0
* Use the single-channel, single-conversion mode
*/
ADC12_A_startConversion(ADC12_A_BASE,
ADC12_A_MEMORY_0,
ADC12_A_REPEATED_SINGLECHANNEL);
//Disable the DMA from preempting a Read-Modify-Write Operation in the CPU
DMA_disableTransferDuringReadModifyWrite();
//Initialize and Setup DMA Channel 0
/*
* Configure DMA channel 0
* Configure channel for repeated single transfers
* DMA interrupt flag will be set after every 1 transfer
* Use DMA Trigger Source 24 (ADC12xIFG)
* Transfer Word-to-Word
* Trigger upon Rising Edge of Trigger Source Signal
*/
DMA_initParam initParam = {0};
initParam.channelSelect = DMA_CHANNEL_0;
initParam.transferModeSelect = DMA_TRANSFER_REPEATED_SINGLE;
initParam.transferSize = 1;
initParam.triggerSourceSelect = DMA_TRIGGERSOURCE_24;
initParam.transferUnitSelect = DMA_SIZE_SRCWORD_DSTWORD;
initParam.triggerTypeSelect = DMA_TRIGGER_RISINGEDGE;
DMA_init(&initParam);
/*
* Configure DMA channel 0
* Use ADC12 Memory Buffer 0 as source
* Don't move the source address after every transfer
*/
DMA_setSrcAddress(DMA_CHANNEL_0,
ADC12_A_getMemoryAddressForDMA(ADC12_A_BASE,
ADC12_A_MEMORY_0),
DMA_DIRECTION_UNCHANGED);
/*
* Configure DMA channel 0
* Use DMA_DST as destination
* Increment destination address after every transfer
*/
DMA_setDstAddress(DMA_CHANNEL_0,
(uint32_t)(uintptr_t)&DMA_DST,
DMA_DIRECTION_INCREMENT);
//Enable DMA channel 0 interrupt
DMA_clearInterrupt(DMA_CHANNEL_0);
DMA_enableInterrupt(DMA_CHANNEL_0);
//Enable transfers on DMA channel 0
DMA_enableTransfers(DMA_CHANNEL_0);
//LPM0 w/ interrupts
__bis_SR_register(LPM0_bits + GIE);
//For Debugger
__no_operation();
}
//------------------------------------------------------------------------------
//DMA Interrupt Service Routine
//------------------------------------------------------------------------------
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=DMA_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(DMA_VECTOR)))
#endif
void DMA_ISR (void)
{
switch (__even_in_range(DMAIV,16)){
case 0: break;
case 2: //DMA0IFG = DMA Channel 0
//Toggle P1.0 - PLACE BREAKPOINT HERE AND CHECK DMA_DST VARIABLE
GPIO_toggleOutputOnPin(
GPIO_PORT_P1,
GPIO_PIN0
);
break;
case 4: break; //DMA1IFG = DMA Channel 1
case 6: break; //DMA2IFG = DMA Channel 2
case 8: break; //DMA3IFG = DMA Channel 3
case 10: break; //DMA4IFG = DMA Channel 4
case 12: break; //DMA5IFG = DMA Channel 5
case 14: break; //DMA6IFG = DMA Channel 6
case 16: break; //DMA7IFG = DMA Channel 7
default: break;
}
}

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ASGAD

1楼-- · 2019-03-24 02:31

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