CODEWITHSUNDEEP
cstm32gpiodac
Archon
Archon

Reputation: 636

STM32F4 DAC pins causes problems with adjacent GPIO pin

I have a strange problem that I dont understand. Please bare with me as this is a difficult problem to deconstruct. I will thus give as much information as I can with test cases and results I have found.

The problem:

if (enable == 1) 
{
  HAL_GPIO_WritePin(PROPULSION_ENABLE_GPIO_PORT, PROPULSION_ENABLE_GPIO_PIN, GPIO_PIN_RESET);                                                                                                           
  HAL_DAC_SetValue(&PropulsionModule_DAC, PropulsionModule_DAC_CHANNEL, DAC_ALIGN_12B_R, PropulsionData.propulsionSetPoint_12bit);
}
else 
{
  HAL_GPIO_WritePin(PROPULSION_ENABLE_GPIO_PORT, PROPULSION_ENABLE_GPIO_PIN, GPIO_PIN_SET); 
  HAL_DAC_SetValue(&PropulsionModule_DAC, PropulsionModule_DAC_CHANNEL, DAC_ALIGN_12B_R, 0);
}

Setup and environment

Findings:

Any help would be greatly appreciated.

Upvotes: 0

Views: 614

Answers (1)

Archon
Archon

Reputation: 636

I found the problem. The problem is the MEMS chip on the discovery board. It is vitally important one realizes that not all pins on the discovery board are usable.

Refer to the first link below from Page 22 on which pins are available. Please note that some of the pins that are "not free" can still be used. See the application notes on each of the chips on the board in the second link.

Link 1: https://www.st.com/resource/en/user_manual/dm00039084-discovery-kit-with-stm32f407vg-mcu-stmicroelectronics.pdf

Link 2: https://ucilnica.fri.uni-lj.si/pluginfile.php/29604/mod_resource/content/1/en.DM00039084.pdf

Upvotes: 1

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