DAC Programmation

[jean-claude]

Posted on July 26, 2009 at 14:30

DAC Programmation

[16-32micros]

Posted on May 17, 2011 at 13:18

Hi,

You can start using the DAC examples provided in the Firmware Library :

http://www.st.com/stonline/products/support/micro/files/stm32f10x_stdperiph_lib.zip and then tailor to your application.

Cheers,

STOne-32.

[jean-claude]

Posted on May 17, 2011 at 13:18

Hello,

For my firt application, I want to use DAC.

My aim is to send a constant value on the pin DAC_OUT1 (pin 20) by using channel 1 of the DAC.

I made this code :

#include ''stm32f10x_lib.h''

#include ''stm32f10x_conf.h''

#include ''stm32f10x_map.h''

#include ''stm32f10x_dac.h''

int main(void){

DAC_DeInit();

DAC_InitTypeDef DAC_InitStructure;

DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;

DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;

DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;

DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;

DAC_Init(DAC_Channel_1, &DAC_InitStructure);

DAC_Init(DAC_Channel_2, &DAC_InitStructure);

DAC_Cmd(DAC_Channel_1, ENABLE);

DAC_Cmd(DAC_Channel_2, ENABLE);

DAC_DMACmd(DAC_Channel_1, DISABLE);

DAC_DMACmd(DAC_Channel_2, DISABLE);

DAC_SoftwareTriggerCmd(DAC_Channel_1, DISABLE);

DAC_SoftwareTriggerCmd(DAC_Channel_2, DISABLE);

DAC_DualSoftwareTriggerCmd(DISABLE);

DAC_SetChannel1Data(DAC_Align_12b_L, 0x500);

DAC_SetChannel2Data(DAC_Align_12b_L, 0x400);

USART_SendData(USART1, DAC_GetDataOutputValue(DAC_Channel_1));

USART_SendData(USART2, DAC_GetDataOutputValue(DAC_Channel_2));

}

Firstly, I have a questions,

My code is good ? I use too much function or not ?

Are the data will be send on the DAC_OUTPUT1 ? (Using usart is just for simulation on debug mode)

Secondly, I have a problem,

The USART DATA REGISTERs 1 and 2 indicate 0x1ff although we must have 0x500 for USART1 and 0x400 for USART2.

(DAC data and USART data use the same type : u12)

So if someone have an idea. I will be happy.

Thanks,

JC.