Arduino for STM32

mlundin

The code looks sound. For how long is the input data valid after the rising edge of nTime ? The attached pin interrupts have fairly long latency.

Since you are using a blocking loop waiting for the notTime flag from the ISR, you might as well wait for the nTime pin to go high and cut out the ...

mlundin

How many samples do you propose to process at a time, and what sample frequency do you want ?

Seriously, using example code and adapting it to your own project is a good way to learn coding and to get a project up and running, but unless you plan to follow the instructables to the letter, you must ...

mlundin

Still overcomplicated, no val arrays or sin and cosines are needed

for (i = 0; i < SAMPLES; i++)
{
if ( i < SAMPLES/2)
{
digitalWrite(PB8, HIGH);
}
else
{
digitalWrite(PB8, LOW);
}
int j = i+PHASE;
/* adjust j by a SAMPLES period to be between 0 and SAMPLES-1 */
if (j>=SAMPLES) j ...

mlundin

Probably because you generate them one after the other, try to write to both pins inside the same loop

for (i = 0; i < SAMPLES; i++)
{
//if ( val1[i] > 40)
if ( val1[i] < 38)
{
digitalWrite(PB8, HIGH);
}
else
{
digitalWrite(PB8, LOW);
}
//if ( val1[i] > 40)
if ( val1[i] > 38 ...

mlundin

The signal output on the PWM pin is a square wave. The digital pins can only output 0 or 1, that is 0V or 3.3V for the STM32 processors. This signal becomes an analog signal only after low pass filtering.

mlundin

You have declared both dma_cfg and dma_cfg2. In dma_conf() you only use dma_cfg, and sets the values for both channels to the same config structure overwriting the first value, then you call
ret = dma_tube_cfg(DMA1, DMA_CH4, &dma_cfg);
ret = dma_tube_cfg(DMA1, DMA_CH3, &dma_cfg);

with the same ...

mlundin

It was more a hint than a question really, your code has

Code: Select all

timer_dev *dev1 = PIN_MAP[out2].timer_device;   
timer_dev *dev2 = PIN_MAP[out2].timer_device;

I think that should be

Code: Select all

timer_dev *dev1 = PIN_MAP[out1].timer_device;   
timer_dev *dev2 = PIN_MAP[out2].timer_device;

mlundin

In your code, what pins are timer_dev *dev1 and dev2 connected to ?

mlundin

Since the external 8MHz signal from the STLink has been replaced by an 8MHz crystal, the internal oscillator must be active and not bypassed. Therefore I think you must replace the line:

Code: Select all

  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;

with

Code: Select all

RCC_OscInitStruct.HSEState = RCC_HSE_ON;

mlundin

The photo looks like an X3 crystal has been added, in that case the clock configuration must be changed in SystemClock_Config(void) defined in variant.cpp

Arduino for STM32

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