Part Number: EK-TM4C1294XL
Tool/software: Code Composer Studio
Hi,
I try to build a circular buffer for my ADC data. I read 8 ADC channels and the result is supposed to written into array uint32_t pui32ADC0Value[8]; by my DMA. This is supposed to happen continuously.
My problem is that with my DMA configuration I can only achieve one <TransferSize> (TransferSize is the last argument in uDMAChannelTransferSet()-call) full of ADC values. After <TransferSize> transfers the DMA stops and no further data are transfered. I checked the ADC FIFO and could observe new values arriving. But for some reason the DMA seems to not be triggered anymore.
How can I make the DMA transfers continuous?
Best regards,
Max
Here is my Code:
/*
* Copyright (c) 2015, Texas Instruments Incorporated
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * 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,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* ======== empty_min.c ========
*/
/* XDCtools Header files */
#include <xdc/std.h>
#include <xdc/runtime/Log.h>
#include <xdc/runtime/System.h>
#include <xdc/runtime/Timestamp.h>
#include <xdc/cfg/global.h>
/* BIOS Header files */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Swi.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/knl/Clock.h>
#include <ti/sysbios/knl/Semaphore.h>
/* TI-RTOS Header files */
// #include <ti/drivers/EMAC.h>
#include <ti/drivers/GPIO.h>
// #include <ti/drivers/I2C.h>
// #include <ti/drivers/SDSPI.h>
// #include <ti/drivers/SPI.h>
// #include <ti/drivers/UART.h>
// #include <ti/drivers/USBMSCHFatFs.h>
// #include <ti/drivers/Watchdog.h>
// #include <ti/drivers/WiFi.h>
/* Board Header file */
#include "Board.h"
#include <stdbool.h>
#include <driverlib/timer.h>
#include <driverlib/sysctl.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_adc.h"
#include <driverlib/interrupt.h>
#include <driverlib/adc.h>
#include <driverlib/gpio.h>
#include <driverlib/udma.h>
#include <driverlib/pin_map.h>
#define TASKSTACKSIZE 512
Task_Struct task0Struct;
Char task0Stack[TASKSTACKSIZE];
uint32_t start, stop, result;
uint32_t pui32ADC0Value[8];
void ledToggle(UArg arg0){
start = Timestamp_get32();
GPIO_toggle(Board_LED1);
//for (i = 0; i < 999999; i++){}
//Log_info1("Toggled LED %d ", i);
stop = Timestamp_get32();
result = stop - start;
return;
}
/*void timerInterrupt(UArg arg0){
TimerIntClear(TIMER2_BASE, TIMER_TIMA_TIMEOUT);
Swi_post(swi0);
return;
}*/
/*
* ======== heartBeatFxn ========
* Toggle the Board_LED0. The Task_sleep is determined by arg0 which
* is configured for the heartBeat Task instance.
*/
Void heartBeatFxn(UArg arg0, UArg arg1)
{
while (1) {
Task_sleep((unsigned int)arg0);
GPIO_toggle(Board_LED0);
}
}
/*
* ======== configure_ADC ========
*/
void configure_ADC(){
//enable peripherals
SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
ADCClockConfigSet(ADC0_BASE, ADC_CLOCK_SRC_PIOSC | ADC_CLOCK_RATE_FULL, 1);
//set pin function
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_3); //AIN0
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_2); //AIN1
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_1); //AIN2
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_0); //AIN3
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_7); //AIN4
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_6); //AIN5
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_5); //AIN6
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_4); //AIN7
/*GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_5); //AIN8
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_4); //AIN9
GPIOPinTypeADC(GPIO_PORTB_BASE, GPIO_PIN_4); //AIN10
GPIOPinTypeADC(GPIO_PORTB_BASE, GPIO_PIN_5); //AIN11*/
//enable sample sequence 3
ADCSequenceConfigure(ADC0_BASE, 0, ADC_TRIGGER_ALWAYS, 1);
ADCSequenceStepConfigure(ADC0_BASE, 0, 0, ADC_CTL_CH0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 1, ADC_CTL_CH1);
ADCSequenceStepConfigure(ADC0_BASE, 0, 2, ADC_CTL_CH2);
ADCSequenceStepConfigure(ADC0_BASE, 0, 3, ADC_CTL_CH3);
ADCSequenceStepConfigure(ADC0_BASE, 0, 4, ADC_CTL_CH4);
ADCSequenceStepConfigure(ADC0_BASE, 0, 5, ADC_CTL_CH5);
ADCSequenceStepConfigure(ADC0_BASE, 0, 6, ADC_CTL_CH6);
ADCSequenceStepConfigure(ADC0_BASE, 0, 7, ADC_CTL_CH7 | ADC_CTL_END);
ADCSequenceEnable(ADC0_BASE, 0);
ADCIntClear(ADC0_BASE, 0);
return;
}
void configure_DMA(){
//ADC DMA
SysCtlPeripheralEnable(SYSCTL_PERIPH_UDMA);
#pragma DATA_ALIGN(DMAcontroltable, 1024)
uint8_t DMAcontroltable[1024];
SysCtlDelay(10);
uDMAEnable();
uDMAControlBaseSet(DMAcontroltable);
uDMAChannelAssign(UDMA_CHANNEL_ADC0);
//SysCtlPeripheralEnable(SYSCTL_PERIPH_UDMA);
//uDMAEnable();
uDMAChannelControlSet(UDMA_CHANNEL_ADC0 | UDMA_PRI_SELECT, UDMA_SIZE_32 | UDMA_SRC_INC_NONE | UDMA_DST_INC_32 | UDMA_ARB_4);
uDMAChannelTransferSet(UDMA_CHANNEL_ADC0 | UDMA_PRI_SELECT, UDMA_MODE_BASIC, (void *)(ADC0_BASE + ADC_O_SSFIFO0), pui32ADC0Value, 8);
//uDMAChannelAttributeEnable(UDMA_CHANNEL_ADC0, UDMA_ATTR_USEBURST);
uDMAChannelEnable(UDMA_CHANNEL_ADC0);
return;
}
/*
* ======== main ========
*/
int main(void)
{
Task_Params taskParams;
/* Call board init functions */
Board_initGeneral();
// Board_initEMAC();
Board_initGPIO();
// Board_initI2C();
// Board_initSDSPI();
// Board_initSPI();
// Board_initUART();
// Board_initUSB(Board_USBDEVICE);
// Board_initUSBMSCHFatFs();
// Board_initWatchdog();
// Board_initWiFi();
/* Construct heartBeat Task thread */
Task_Params_init(&taskParams);
taskParams.arg0 = 1000;
taskParams.stackSize = TASKSTACKSIZE;
taskParams.stack = &task0Stack;
Task_construct(&task0Struct, (Task_FuncPtr)heartBeatFxn, &taskParams, NULL);
configure_ADC();
ADCSequenceDMAEnable(ADC0_BASE, 0);
configure_DMA();
/*SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER2);
//
// Configure the Timer0B interrupt for timer timeout.
//
TimerConfigure(TIMER2_BASE, TIMER_CFG_A_PERIODIC);
TimerLoadSet(TIMER2_BASE, TIMER_A, 12000000);
TimerIntEnable(TIMER2_BASE, TIMER_TIMA_TIMEOUT);
//IntEnable(INT_TIMER2A);
TimerEnable(TIMER2_BASE, TIMER_A);
*/
/* Turn on user LED */
GPIO_write(Board_LED0, Board_LED_ON);
GPIO_write(Board_LED1, Board_LED_ON);
//ADCIntEnable(ADC0_BASE, 0 );
//ADCSequenceDMAEnable(ADC0_BASE, 1);
//ADCProcessorTrigger(ADC0_BASE, 0);
//ADCProcessorTrigger(ADC0_BASE, 1);
/* Start BIOS */
//BIOS_start();
while(1);
return (0);
}
