2014-10-09 10:27 AM
For Adc1 I am still reading 0.0, but Adc2 and Adc3 are fine. Any ideas?
Where do you go to check theCDR_ADDRESS for ADC1, ADC2, and ADC3? The data sheet of my STM32F207-SK board is locatedhttp://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00237pdf
. Your kindness and guidance is greatly appreciated. Hopefully, I will gain enough knowledge about this micro so that I can pass it on to other people.Below is my Code:
static volatile Int32U TimingDelay;
int i;
__IO Int16U Adcdata[3];
__IO float Adc1=0;
float Adc1_avg=0;
__IO float Adc2=0;
float Adc2_avg=0;
__IO float Adc3=0;
float Adc3_avg=0;
/**************************************************************************************/
void
RCC_Configuration(
void
)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOE, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2 | RCC_APB2Periph_ADC3, ENABLE);
}
/**************************************************************************************/
void
DelayResolution100us(Int32U Dly)
{
TimingDelay = Dly;
while
(TimingDelay != 0);
}
/**
* @brief Decrements the TimingDelay variable.
* @param None
* @retval None
*/
void
TimingDelay_Decrement(
void
)
{
if
(TimingDelay != 0x00)
{
TimingDelay--;
}
}
void
GPIO_Configuration(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* ADC Channel 8 -> PB0 ADC12_IN8
ADC Channel 15 -> PC5 ADC12_IN15
ADC Channel 0 -> PA0 ADC123_IN0
*/
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/**************************************************************************************/
void
ADC_Configuration(
void
)
{
ADC_DeInit();
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
/* ADC Common Init - COMMON - Do it once, do it first */
ADC_CommonInitStructure.ADC_Mode = ADC_TripleMode_RegSimult;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
// 2 half-words one by one, 1 then 2 then 3
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_6Cycles;
//6 or 5?
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
// 1 Channel - why is it DISABLE?
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
// Continuous Conversions
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
//ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO; // Ignored - why include it if ignored?
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Init(ADC2, &ADC_InitStructure);
// Mirror on ADC2
ADC_Init(ADC3, &ADC_InitStructure);
// Mirror on ADC3
/* ADC3 regular channel 8 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_56Cycles);
// PB0
/* ADC2 regular channel 5 configuration */
ADC_RegularChannelConfig(ADC2, ADC_Channel_15, 1, ADC_SampleTime_56Cycles);
// PC5
/* ADC3 regular channel 0 configuration */
ADC_RegularChannelConfig(ADC3, ADC_Channel_0, 1, ADC_SampleTime_56Cycles);
// PA0
/* Enable DMA request after last transfer (Multi-ADC mode) */
ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable ADC2 */
ADC_Cmd(ADC2, ENABLE);
/* Enable ADC3 */
ADC_Cmd(ADC3, ENABLE);
ADC_DMACmd(ADC1, ENABLE);
//enable ADC1 DMA since ADC1 is the master
}
/**************************************************************************************/
static
void
DMA_Configuration(
void
)
{
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(DMA2_Stream0);
//Set DMA registers to default values
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&Adcdata;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)0x40012308;
// CDR_ADDRESS; Packed ADC1, ADC2
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = 3;
// Count of 16-bit words
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_Enable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
/* DMA2_Stream0 enable */
DMA_Cmd(DMA2_Stream0, ENABLE);
}
/**************************************************************************************/
int
main(
void
)
{
ENTR_CRT_SECTION();
if
(SysTick_Config(SystemCoreClock/10000))
{
while
(1);
}
EXT_CRT_SECTION();
RCC_Configuration();
GPIO_Configuration();
ADC_Configuration();
DMA_Configuration();
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConv(ADC1);
/*Turn on Backlight*/
GLCD_Backlight(BACKLIGHT_ON);
GLCD_SetFont(&Terminal_9_12_6,0x000F00,0x00FF0);
GLCD_SetWindow(10,116,131,131);
/*-------------------Display Readings-----------------------------------------*/
GLCD_PowerUpInit((pInt8U)IAR_Logo.pPicStream);
GLCD_Backlight(BACKLIGHT_ON);
while
(1){
/***** Compute Gain and Phase ****/
Adc3_avg = 0;
Adc2_avg = 0;
Adc1_avg = 0;
DelayResolution100us(10000);
for
(i=1;i<=20;i++)
{
DelayResolution100us(10000);
Adc1=(((
float
)Adcdata[0]) * 3.3)/4096;
//voltage value
Adc1_avg = Adc1_avg + Adc1;
//average gain
// Adc2con = (Adcdata[1] & 0x0FFF);
Adc2=(((
float
)Adcdata[1]) * 3.3)/4096;
//voltage
Adc2_avg = Adc2_avg + Adc2;
//average phase
// Adc3con = (Adcdata[1] & 0x0FFF);
Adc3=(((
float
)Adcdata[2]) * 3.3)/4096;
//voltage
Adc3_avg = Adc3_avg + Adc3;
//average phase
}
Adc1_avg = Adc1_avg/20;
Adc2_avg = Adc2_avg/20;
Adc3_avg = Adc3_avg/20;
//Write to LCD
GLCD_TextSetPos(0,0);
GLCD_print(
''G:%.02f''
, Adc3_avg);
GLCD_TextSetPos(7,0);
GLCD_print(
''P1:%.02f''
, Adc2_avg);
GLCD_TextSetPos(17,0);
GLCD_print(
''P2:%.02f''
, Adc1_avg);
};
// Don't want to exit
}
#adc #stm32 #dma
2014-10-09 11:43 AM
Where do you go to check theCDR_ADDRESS for ADC1, ADC2, and ADC3?
Thehttp://www.st.com/web/en/resource/technical/document/reference_manual/CD002257pdf
for the part? The data sheet of my STM32F207-SK board is locatedhttp://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00237pdf
.That has no information about your BOARD.
2014-10-09 01:34 PM
It seems like when I change DMA_Mode from DMA_Mode_Circular to DMA_Mode_Normal, it works but the data is no longer continuous.
Also, in the reference manual it says that DMA mode 1 is used for triple mode. What does that mean?ADC_CDR is 32 bits do I have to do something special so that it takes 3 ADC values? I'm assuming that the library already does something like that for us.2014-10-09 02:19 PM
The manual can be pretty heavy going, you'll have to read and experiment.
I posted a triple interleave example .2014-10-14 11:29 AM
Hi Clive1,
Thank-you so much for your reply, and showing me the correct reference manual. I was able to get triple mode working. Cheers, - Lux