DMA Channel Timer1 configuration

jgalea · ‎2009-02-04

Posted on February 05, 2009 at 04:49

jgalea · ‎2011-05-17

Posted on May 17, 2011 at 12:56

Hello everyone,

My name is Johann Galea from Malta, and this is my first time in a forum. Right now Im using the STM32F101C. Im trying to convert 7 analogue channels with DMA1, as I will have only one interrupt at the end of the 7 conversions. Im setting the parameters as shown in examples. However, Im not getting a DMA intrerrupt. Timer 1 is working at the desired frequency. Can you please forward any suggestions. These are my codes:

void TIM1_UP_IRQHandler(void)

{

//checks if interrupt occured

if (TIM_GetITStatus(TIM1,TIM_IT_Update) == SET)

{ TIM_ClearITPendingBit(TIM1, TIM_IT_Update);

//Start by software the ADC1 Conversion

//ADC_Cmd should be called twice, once to wake from powerdown, second to start conversion; manual RM0008 section 10.12.3 ADON not sure

ADC_Cmd(ADC1, ENABLE); //enable ADC

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

}

void DMA1_Channel1_IRQHandler(void)

{ //channel 1 includes ADC1

SUPPLY_LED_ON; //this is not turning ON

//DMA1_IT_TC1 DMA1 Channel1 transfer complete interrupt

//checks wether specified DMA Channel interrupt occured or not.

//DMA Channel1 transfer/half complete

if (DMA_GetITStatus(DMA1_IT_HT1)==SET)

{ DMA_ClearITPendingBit(DMA1_IT_HT1);//clear DMA channel transfer complete bit

}

if(DMA_GetITStatus(DMA1_IT_TC1)==SET)

{ DMA_ClearITPendingBit(DMA1_IT_TC1);//clear DMA channel1 transfer complete bit

}

L1v_value = ADC_result[0];

}

void Init_ADC(void)

{ //RM0008 pg 135, low density have DMA1 with 7 channels

ADC_InitTypeDef ADC_InitStructure;

DMA_InitTypeDef DMA_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

ADC_DeInit(ADC1); //resets ADC1

//Initialisation of DMA channel 1

DMA_DeInit(DMA1_Channel1);//pg 125

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;//peripheral base address

DMA_InitStructure.DMA_MemoryBaseAddr =

(u32)ADC_result;//memory base address

DMA_InitStructure.DMA_DIR =

DMA_DIR_PeripheralSRC;//peripheral is the source

DMA_InitStructure.DMA_BufferSize =

ADC_nbrElement;//number of DMA buffers

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//peripheral address unchanged

DMA_InitStructure.DMA_MemoryInc =

DMA_MemoryInc_Enable;//current memory register incremented

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//16 bits

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//16 bits

DMA_InitStructure.DMA_Mode =

DMA_Mode_Circular;//circular buffer mode

DMA_InitStructure.DMA_Priority = DMA_Priority_High;//high priority

DMA_InitStructure.DMA_M2M =

DMA_M2M_Disable;//not from memory to memory transfer

DMA_Init(DMA1_Channel1, &DMA_InitStructure);

DMA_ClearFlag (DMA1_FLAG_GL1 | DMA1_FLAG_TC1 | DMA1_FLAG_HT1);//clears DMA1 channel 1 transfer complete

//Enables DMA channel interrupt when transfer is completed

//transfer complete or half complete

//DMA_ITConfig( DMA1_Channel1, (DMA1_FLAG_TC1 | DMA1_FLAG_HT1) , ENABLE);

/* Enable the DMAChannel1 Interrupt */

NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQChannel;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

/* Enable DMA1 Channel1 complete transfer interrupt */

DMA_ITConfig(DMA1_Channel1, (DMA_IT_TC | DMA_IT_HT), ENABLE);

DMA_Cmd(DMA1_Channel1, ENABLE);//enable DMA channel 1

//ADC1 Configuration pg 59

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;//ADCs operate in independent mode

ADC_InitStructure.ADC_ScanConvMode

= ENABLE;//conversion done in Scan

ADC_InitStructure.ADC_ContinuousConvMode

= DISABLE;//only one pass of conversions

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//conversion started by software

ADC_InitStructure.ADC_DataAlign

= ADC_DataAlign_Right;//ADC data right aligned

ADC_InitStructure.ADC_NbrOfChannel

= ADC_nbrElement;//no of ADC channels to convert in a group

ADC_Init(ADC1, &ADC_InitStructure);

//regular ADC channel configuration

ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1 , ADC_SampleTime_13Cycles5 );//VL1

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2 , ADC_SampleTime_13Cycles5 );//VL2

ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3 , ADC_SampleTime_13Cycles5 );//VT1

ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4 , ADC_SampleTime_13Cycles5 );//VT2

ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5 , ADC_SampleTime_13Cycles5 );//VT3

ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6 , ADC_SampleTime_13Cycles5 );//L3 ref

ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 7 , ADC_SampleTime_13Cycles5 );//Shunt

ADC_DMACmd(ADC1, ENABLE);//enables ADC1 DMA transfer

ADC_Cmd(ADC1, ENABLE); //enable ADC

//Resets the selected ADC calibration registers.

ADC_ResetCalibration(ADC1);

while(ADC_GetResetCalibrationStatus(ADC1));

//start ADC1 calibration

ADC_StartCalibration(ADC1);

while(ADC_GetCalibrationStatus(ADC1) == SET);

}

Im suspecting that I have something wrong in the order of the code

Many thanks

Johann

jki79ros81 · ‎2011-05-17

Posted on May 17, 2011 at 12:56

Do you set RCC?

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

or

Value of ADC_nbrElement ?

If it transmited not as ADC_nbrElement, interrupt not generated.

Hope help.

jgalea · ‎2011-05-17

Posted on May 17, 2011 at 12:56

Many thanks. I placed my code on this forum link:

http://www.st.com/mcu/forums-cat-7925-23.html

Johann