Posted on March 17, 2014 at 18:51Dear All,
I have tested the DAC example on the STM32F429 and I have understood the way using / driving the DAC on the STM32F4. I have tried to create my sample code using the STM32F429 Discovery template, but nothing happened.
Here below the code:
RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOA, ENABLE);
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);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 0xFF;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);
TIM_Cmd(TIM6, ENABLE);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_SetChannel1Data(DAC_Align_12b_R, 500);
I Have checked with the oscilloscope, but nothing changes.
Then I have tested the DAC_SignalGeneration and it run correctly.
Then I have tried to modify the DAC_SignalGeneration example and I have only changed this piece of code:
while (1)
{
/* If the User Button is pressed */
if (KeyPressed == RESET)
{
DAC_DeInit();
/* select waves forms according to the Key Button status */
if (SelectedWavesForm == 1)
{
/* The sine wave and the escalator wave has been selected */
/* Escalator Wave generator ------------------------------------------*/
DAC_Ch1_EscalatorConfig();
/* Sine Wave generator -----------------------------------------------*/
DAC_Ch2_SineWaveConfig();
}
else
{
/* The triangle wave and the noise wave has been selected */
/* Noise Wave generator ----------------------------------------------*/
DAC_Ch1_NoiseConfig();
/* Triangle Wave generator -------------------------------------------*/
DAC_Ch2_TriangleConfig();
}
KeyPressed = SET;
}
}
In the following way:
while (1)
{
/* If the User Button is pressed */
if (KeyPressed == RESET)
{
DAC_DeInit();
/* select waves forms according to the Key Button status */
if (SelectedWavesForm == 1)
{
/* The sine wave and the escalator wave has been selected */
/* Escalator Wave generator ------------------------------------------*/
//DAC_Ch1_EscalatorConfig(); /* Sine Wave generator -----------------------------------------------*/
DAC_Ch2_SineWaveConfig();
}
else
{
/* The triangle wave and the noise wave has been selected */
/* Noise Wave generator ----------------------------------------------*/
//DAC_Ch1_NoiseConfig(); /* Triangle Wave generator -------------------------------------------*/
//DAC_Ch2_TriangleConfig(); }
KeyPressed = SET;
}
}
Sincerly I do not understand where is the problem, I have read a lot of things on internet and I have tried to do all the possible changes, but the DAC does not run with and without DMA.
Could someone help me about this problem?
Thanks!
