Not working on STM32F407VGTx

[Samed-Hamma]

Hi Omuzychko ! Thank you for your contribution ! So i've been trying to make my motors work on an STM32F4 Discovery Board with 2 Bipolar Steppers and DRV8825 drivers, didn't work for me ! Motors are just stopped. First of all I put a #define TEST I tried modifying DEFAULT_MAX_SPS and ACCSPS_TO_MINSPS_RATIO but didn't work for me. I Couldn't run it in serial because there's no definition for the function void ExecuteRequest(stepper_request * r); I have no tools to check if my TIM pins are actually outputing something ! (Sorry for that).

[omuzychko]

Hi Sam,

Any other board could fail unless you make sure that TIM pheriperals are exactly the same type I've used on NUCLEO board (compare datasheets of both controllers regarding timer pheriperals specifications, siz es of counter and prescaller registers). Do you have a holding torque on the motors when they stopped? If not - driver EN pin is not activated.

If you don't have an osciliscope to check the TIM pin output - there are two DIY hacks I've used before I was able to afford the scope:

• MIC/Line-In input of your computer with recording software (use resistor dividers not to burn your sound adapter, just google some schematics on the web)

• Speaker/headphones. If the stepping frequency is within the range of 20...20000 Hz connecting a speaker to TIM pin and a ground would make it generate a tone. So if you hear the tone but motor not spinning - you have messed up your clocks configuration ( too fast to start the motor, you should started from slower speed - reduce the timer pheriperal clock speed)

• Alex

On Oct 6, 2017 11:31 PM, "Sam" notifications@github.com wrote:

Hi Omuzychko ! Thank you for your contribution ! So i've been trying to make my motors work on an STM32F4 Discovery Board with 2 Bipolar Steppers and DRV8825 drivers, didn't work for me ! Motors are just stopped. First of all I put a #define TEST I tried modifying DEFAULT_MAX_SPS and ACCSPS_TO_MINSPS_RATIO but didn't work for me. I Couldn't run it in serial because there's no definition for the function void ExecuteRequest(stepper_request * r); I have no tools to check if my TIM pins are actually outputing something ! (Sorry for that).

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[Samed-Hamma]

Hi Alex, I haven't checked yet using your brilliant methods, I put 2 steppers, one is not connected to En pin, the other is connected, both apply holding torque, I started another project on CubeMx with the right configuration for my card, and copied your code, I don't think it's a speed problem because I 'm using 1/32 microstepping (M0, M1 and M2 are HIGH on my DRV8825)

[Samed-Hamma]

Hi Alex, finally i got it to work, the issue was with Stepper_SaveConfig() and Stepper_LoadConfig() (even with changing values to the data section of the F407 which is rather FLASH_SECTOR_6 on adress 0x08040000). I also got my best frequency with a half step resolution. I couldn't send or receive commands yet via serial because serial.h didn't work for me either to tune the controls, but i'm happy now and i'll work on it more tomorrow. Thanks for your job ! That's beautiful (and pretty complex).

[omuzychko]

Glad you made it. Additionally to serial RX/TX pins hardware config you also have to make sure your DMA controller configured properly as well.