Posted on May 17, 2011 at 13:18Hello,
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.
