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STM32F4DISCOVERY using DAC pins A4 & A5 without the codec

jean_prieur
Associate III

‎2013-04-10 6:44 AM

Posted on April 10, 2013 at 15:44

Hello,

I'm using a STM32F4DISCOVERY to program the firmware of my future board. I want to use the integrated 12 bit DAC of the board to generate analog simple signals on the A4 and A5 pins, but I don't want to use the external audio codec CS43L22 of the discovery board. On theSTM32F4DISCOVERY board A4 and A5 are connected to the LIS30 and the CS43L22 but I think it's OK to use these pins for generate analog signals. Am I right ? So I try to program with this code I found on a forum: 


int
main(
void
)

{

GPIO_InitTypeDef GPIO_InitStructure;

DAC_InitTypeDef DAC_InitStructure;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;


/* Enable DAC and GPIOC clock */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC | RCC_APB1Periph_TIM2, ENABLE);


/* Configure PA.04/05 (DAC) as output -------------------------*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);



/* DAC channel1 Configuration */

DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;

DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;

DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;

DAC_Init(DAC_Channel_2, &DAC_InitStructure);


/* Enable DAC Channel2: Once the DAC channel2 is enabled, PA.05 is

automatically connected to the DAC converter. */

DAC_Cmd(DAC_Channel_2, ENABLE);


while
(1)

{

int
i;


for
(i=0; i<4096; i++)

DAC_SetChannel2Data(DAC_Align_12b_R, i);

}



/* does not exit - kind of important */


return
(1);

}

This code works on STM32F3xx but there is some problems with STM32F4xxcompactibility. Line 8, ''RCC_APB2Periph_AFIO'' and ''RCC_APB2Periph_GPIOA'' are not declared in librairies. Is anyone know what are the RCC_APB2Periph_AFIO andRCC_APB2Periph_GPIOA equivalent in STM32F4xx ? Thanks for your help ! note: I'm using the latest STM32F4xx librairies, but not thestm32f4_discovery librairy. #dac #stm32f407 #stm32f4discovery
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Tesla DeLorean
Guru

‎2013-04-10 7:15 AM

Posted on April 10, 2013 at 16:15

There are parts of that which look

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/DispForm.aspx?ID=15242&RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/dac%20configuration

.

SYSCFG is some what equivalent to AFIO, but irrelevant in this context.

/* GPIOA Periph clock enable */

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

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jean_prieur
Associate III

‎2013-04-10 7:27 AM

Posted on April 10, 2013 at 16:27

Yes clive1, I think it comes from your code !

So I need to change: 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA, ENABLE);

With: 

/* GPIOA Periph clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

Now I have no compilation errors, but I have nothing on PA5 and PA4...
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jean_prieur
Associate III

‎2013-04-10 7:56 AM

Posted on April 10, 2013 at 16:56

Sorry, in fact it's working fine !

I can generate analog signals between 0V and 3V!

The next step is to control a modular synth, I have to link an Opamp between PA5 and the modular synth.

I found this ref, I think it's the perfect choice: 

http://www.st.com/web/catalog/sense_power/FM123/SC61/SS1614/PF65462?s_searchtype=partnumber

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jean_prieur
Associate III

‎2013-04-11 8:05 AM

Posted on April 11, 2013 at 17:05

I have a new problem with the DAC...

I just try to put the code in .c .h files but now the two DAC are not working anymore... This is my init_DAC.c code: 

/* Use standard template */
#define USE_STDPERIPH_DRIVER
#define STM32F4XX
/* Includes */
#include ''stm32f4xx_rcc.h''
#include ''stm32f4xx_gpio.h''
#include ''stm32f4xx_dac.h''
#include ''stm32f4xx_tim.h''
void
DAC_Config(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure;
DAC_InitTypeDef DAC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
/* GPIOA Periph clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* GPIOD Periph clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
/* Enable DAC and GPIOC clock */
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC | RCC_APB1Periph_TIM2, ENABLE);
/* Configure PA.04/05 (DAC) as output -------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* DAC channel1 & DAC_Channel_2 Configuration */
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_2, &DAC_InitStructure);
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
/* Enable DAC Channel1 & Channel2: Once the DAC is enabled, PA.05 is
automatically connected to the DAC converter. */
DAC_Cmd(DAC_Channel_2, ENABLE);
DAC_Cmd(DAC_Channel_1, ENABLE);
}

In main.c I call this function... 

DAC_Config();

...and I gererate analog levels: 

DAC_SetChannel1Data(DAC_Align_12b_R, 4095);
DAC_SetChannel2Data(DAC_Align_12b_R, 2095);

But no outputs on PA3 and PA4. If I replace

DAC_Config();

by the corresponding code of DAC_Config() it's working ! Do you have any idea ? Thanks !
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Tesla DeLorean
Guru

‎2013-04-11 10:07 AM

Posted on April 11, 2013 at 19:07

Per STM32F2xx_StdPeriph_Lib_V1.1.0\Project\STM32F2xx_StdPeriph_Examples\DAC\DAC_SignalsGeneration (applicable to F4 too) 

/* DMA1 clock and GPIOA clock enable (to be used with DAC) */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1 | RCC_AHB1Periph_GPIOA, ENABLE);
/* DAC Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
/* DAC channel 1 & 2 (DAC_OUT1 = PA.4)(DAC_OUT2 = PA.5) configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);

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jean_prieur
Associate III

‎2013-04-12 5:34 AM

Posted on April 12, 2013 at 14:34

Thanks clive1, I think that improved my code, but I have still the same problem...

1) The DAC initialisation is in the file init_DAC.c that I call from main.c In this configuration the DAC outputs are not working, in fact, they are working 1 of ten times (other times the two outputs generates randomly 0V or 3V) 2) If I copy EXACTLY the code of the dac initialisation into main.c this is perfectly working ! This is init_DAC.c: 

/* Includes */
#include ''stm32f4xx_rcc.h''
#include ''stm32f4xx_gpio.h''
#include ''stm32f4xx_dac.h''
void
DAC_Config(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure_DAC;
DAC_InitTypeDef DAC_InitStructure;
/* GPIOA Periph clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1 | RCC_AHB1Periph_GPIOA, ENABLE);
/* Enable DAC clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
/* DAC channel 1 & 2 (DAC_OUT1 = PA.4)(DAC_OUT2 = PA.5) configuration */
GPIO_InitStructure_DAC.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure_DAC.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure_DAC.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure_DAC);
/* DAC channel1 & DAC_Channel_2 Configuration */
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_2, &DAC_InitStructure);
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
/* Enable DAC Channel1 & Channel2: Once the DAC is enabled, PA.05 is
automatically connected to the DAC converter. */
DAC_Cmd(DAC_Channel_2, ENABLE);
DAC_Cmd(DAC_Channel_1, ENABLE);
}

This is main.c: 

/* Includes */
#include ''stm32f4xx_rcc.h''
#include ''stm32f4xx_gpio.h''
#include ''stm32f4xx_dac.h''
#include ''stm32f4xx_tim.h''
#include ''stm32f4xx_dma.h''
#include ''init_DAC.h''
int
main(
void
)
{
int
i;
DAC_Config();
while
(1)
{
for
(i=0; i<4095; i=i+5) DAC_SetChannel2Data(DAC_Align_12b_R, i);
for
(i=4095; i>0; i=i-8) DAC_SetChannel2Data(DAC_Align_12b_R, i);
DAC_SetChannel1Data(DAC_Align_12b_R, 4095);
}
return
(1);
}

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Tesla DeLorean
Guru

‎2013-04-12 7:00 AM

Posted on April 12, 2013 at 16:00

Well that would be annoying, what tool chain are you using?

If I were perplexed I'd look at the assembler code generated by the two cases, and see if that shed any light on the situation.
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jean_prieur
Associate III

‎2013-04-12 7:46 AM

Posted on April 12, 2013 at 16:46

I'm using the yagarto toolchain (with Coocox IDE)...

I forgot to mention that the behaviour is random when I reset the discoveryboard too (with the RST button), not only when I program the flash.

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Tesla DeLorean
Guru

‎2013-04-12 9:12 AM

Posted on April 12, 2013 at 18:12 

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