DMA2 (Can't Configure Seperate Streams for ADC1 and ADC2)

[Puzamoya]

Posted on September 18, 2014 at 17:44

I have the STM32F407 Discovery board.

I am configuring two streams using DMA and ADC The first stream uses Stream 0 channel 0 of the DMA 2 ie ADC1 which reads the value of ADC chanel 9 1N9 and gets sent to circular buffer and send as audio 8Khz. The second stream uses Stream 2 channel 1 of DMA2 ie ADC2 which reads values of ADC channels 2N - 0,1,5,6,7,8 at 1Khz. using DR and Tim3 TRGOut as the trigger. If I configure each stream independently it works (ie I have not configured the other). If I configure both DMA2/Streams/ADCX. The first configured DMA2_streamX_Interupt handler does not fire.

[Tesla DeLorean]

Posted on September 18, 2014 at 18:02

Stream 2 channel 2 of DMA2 ie ADC2

No

[Puzamoya]

Posted on September 18, 2014 at 19:09

Sorry Clive I meant to write Channel 1 not channel 2

I'm definitly using Stream0Channel0 for ADC1 and Stream2Channel1for ADC2 I may have to post my code tomorrow when I get to work! Thanks Robin

[Puzamoya]

Posted on September 19, 2014 at 11:10 The original post was too long to process during our migration. Please click on the provided URL to read the original post. https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I6ol&d=%2Fa%2F0X0000000bw9%2F7NmJPG.h17dP47_pxnK4eZyqUkM8m8kcVN75A0aV9iw&asPdf=false

[Puzamoya]

Posted on September 19, 2014 at 11:13

My DMA2 stream 2 channel 1 Code

GPIO_InitTypeDef       GPIO_InitStructure; DMA_InitTypeDef       DMA_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; ADC_CommonInitTypeDef ADC_CommonInitStructure; ADC_InitTypeDef       ADC_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; /* disable ADC */ ADC_Cmd(ADC2, DISABLE); /* Deinitializes the ADC peripheral registers */ ADC_DeInit(); /* Enable and set ADC DMA Interrupt priority */ NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ADC_DMA_INT_PRIORITY; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); /* Enable ADC's, DMA2 and GPIO clocks ****************************************/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); RCC_AHB1PeriphClockCmd(ANALOG_1_GPIO_CLK | ANALOG_2_GPIO_CLK | ANALOG_3_GPIO_CLK | ANALOG_4_GPIO_CLK |  ANALOG_5_GPIO_CLK |  ANALOG_6_GPIO_CLK , ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE); /* DMA2 Stream0 channel0 configuration **************************************/ DMA_InitStructure.DMA_Channel = DMA_Channel_1; DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC2->DR;; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADCConvertedValue; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = (uint32_t)countof(ADCConvertedValue); DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA2_Stream2, &DMA_InitStructure); DMA_ClearFlag(DMA2_Stream2, DMA_FLAG_HTIF2); DMA_ClearFlag(DMA2_Stream2, DMA_FLAG_TCIF2); DMA_ClearFlag(DMA2_Stream2, DMA_FLAG_TEIF2); DMA_ClearFlag(DMA2_Stream2, DMA_FLAG_DMEIF2); DMA_ClearFlag(DMA2_Stream2, DMA_FLAG_FEIF2); /* enable interrupts */ DMA_ITConfig(DMA2_Stream2, DMA_IT_TC, ENABLE); /* enable DMA */ DMA_Cmd(DMA2_Stream2, ENABLE); /* Configure ADC Channel pins as analog input ******************************/ GPIO_InitStructure.GPIO_Pin = ANALOG_1_PIN; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; GPIO_Init(ANALOG_1_GPIO_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = ANALOG_2_PIN; GPIO_Init(ANALOG_2_GPIO_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = ANALOG_3_PIN; GPIO_Init(ANALOG_3_GPIO_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = ANALOG_4_PIN; GPIO_Init(ANALOG_4_GPIO_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = ANALOG_5_PIN; GPIO_Init(ANALOG_5_GPIO_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = ANALOG_6_PIN; GPIO_Init(ANALOG_6_GPIO_PORT, &GPIO_InitStructure); /* ADC Common Init **********************************************************/ /* 22.5Mhz ADC clock */ ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; ADC_CommonInit(&ADC_CommonInitStructure); /* ADC Init ****************************************************************/ ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = ENABLE; ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; /* set trigger to timer 2 */ ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfConversion = (uint32_t)countof(ADCConvertedValue); ADC_Init(ADC2, &ADC_InitStructure); /* ADC1 regular channel1 configuration *************************************/ ADC_RegularChannelConfig(ADC2, ADC_Channel_0, 1, ADC_SampleTime_3Cycles); ADC_RegularChannelConfig(ADC2, ADC_Channel_1, 2, ADC_SampleTime_3Cycles); ADC_RegularChannelConfig(ADC2, ADC_Channel_5, 3, ADC_SampleTime_3Cycles); ADC_RegularChannelConfig(ADC2, ADC_Channel_6, 4, ADC_SampleTime_3Cycles); ADC_RegularChannelConfig(ADC2, ADC_Channel_7, 5, ADC_SampleTime_3Cycles); ADC_RegularChannelConfig(ADC2, ADC_Channel_8, 6, ADC_SampleTime_3Cycles); /* enable temperature sensor */ //ADC_TempSensorVrefintCmd(ENABLE); /* Enable DMA request after last transfer (Single-ADC mode)  */ ADC_DMARequestAfterLastTransferCmd(ADC2, ENABLE); /* Enable ADC2 */ ADC_Cmd(ADC2, ENABLE); /* Enable ADC2 DMA */ ADC_DMACmd(ADC2, ENABLE); /* setup TIM3 for ADC trigger */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); /* set to 40Khz */ TIM_TimeBaseStructure.TIM_RepetitionCounter = (uint8_t)0; TIM_TimeBaseStructure.TIM_Period = (uint32_t)(((uint32_t)SystemCoreClock/(uint32_t)168000) - (uint32_t)1); TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = (uint16_t)0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);  TIM_Cmd(TIM3, ENABLE);

[Tesla DeLorean]

Posted on September 19, 2014 at 19:14

/* Deinitializes the ADC peripheral registers */

ADC_DeInit(); Wouldn't do that or the Common stuff twice.

[Tesla DeLorean]

Posted on September 19, 2014 at 19:27

Yikes none of the numbers/comments here make any sense with respect to stated specification.

/* setup TIM3 for ADC trigger */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
/* set to 40Khz */
TIM_TimeBaseStructure.TIM_RepetitionCounter = (uint8_t)0;
TIM_TimeBaseStructure.TIM_Period = (uint32_t)(((uint32_t)SystemCoreClock/(uint32_t)168000) - (uint32_t)1);
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = (uint16_t)0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update); 
TIM_Cmd(TIM3, ENABLE);

For 1 KHz periodicity // APB1 assumed at DIV4, TIMCLK thus DIV2 TIM_TimeBaseStructure.TIM_Period = ((SystemCoreClock / 2) / 1000) - 1; You're trying to compute the number of clock ticks at 84 MHz in the Period of a 1 KHz signal. 84000 ticks won't fit in 16-bit, so lets hope you picked a 32-bit timer, or you'll need to use a prescaler of 2-1 to get to 42000-1

[Tesla DeLorean]

Posted on September 19, 2014 at 19:32

No TIM3 definitely 16-bit

TIM_TimeBaseStructure.TIM_Prescaler = 2 - 1;// DIV2 of (SystemCoreClock / 2) TIM_TimeBaseStructure.TIM_Period = ((SystemCoreClock / 4) / 1000) - 1;