About jlaufer

jlaufer · 2024-12-12

I'm trying to port Adafruit's RA8875 Arduino library to work with an STM32F4 Discovery board. The SPI communication is failing during device initialization. During initialization, when reading the device ID register (0x0), I expect to read 0x75 but ...

jlaufer · 2024-05-17

I am using STM32F4 and I am trying to create 8 independent pulse outputs. I have chosen 8 timers looking at the STM32F4 Discovery datasheet and mapped them to pins. I have code for TIM2 and TIM5 that works perfectly. I change the pulse and the freque...

jlaufer · 2024-05-16

I have been unsuccessful in using TIM1 in Output Compare mode. I was trying to use the code that works for the general purpose timers but I cannot get it to work with the advanced timer TIM1. I read online that it is because it was an advanced timer ...

jlaufer · 2024-05-16

I am trying to control 8 independent pulse channels using 8 independent pins of the STM32F407. Each pin will supply the pulse pin to a different motor, so I will be controlling 8 independent motors with the microcontroller. For each pin I am assignin...

jlaufer · 2024-04-19

Hi, I have an application where I need to send send signals to 8 stepper drivers on my STM32F407 Discovery board. Each stepper driver requires an independent PULSE, DIRECTION, and SLEEP signal. DIRECTION and SLEEP are trivial GPIOs high/low. I have u...

jlaufer · 2024-12-19

I don't think it's power. There is designated 5V LDO L7805 giving power to both MCU and RA8875. Here is the logic analyzer output. Here is full source code if it helps at all.

jlaufer · 2024-05-17

It was the IRQ handler names which are different as well as the NVIC settings void SysTick_Handler(void) { HAL_IncTick(); HAL_SYSTICK_IRQHandler(); } void USART2_IRQHandler(void) { HAL_UART_IRQHandler(&huart2); } void TIM5_IRQHandler(void) { HA...

jlaufer · 2024-04-20

You are right. I got this number based on the chapter headers of the reference manual where it lists the type of timer and then in parenthesis the timer numbers that apply to that timer… confusing. Thanks.

jlaufer · 2024-03-13

After looking closer, it seems like huart->RxState is getting suck in HAL_UART_STATE_BUSY_RX. I don't understand why or how to fix it.Even if I do 1 Tx/Rx then wait a really long time (a minute) then do another, then I send a Tx to the STM32, the RX ...

jlaufer · 2024-03-13

That's actually how I had it originally but changed it because I thought maybe calling HAL_UART_Transmit() from HAL_UART_Receive_IT() could have been causing the issue. I put it back to how it was with the exact same result. I placed breakpoints and...

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STM32F4 SPI Communication Issue with RA8875 Display Controller

TIM2/TIM5 works but same code does not work for any other timers

STM32F407 using advanced timer TIM1 in output compare

Not all timer interrupts working on STM32F407 (shared timer IRQ settings)

8 pulse pin outputs on the STM32F407 (Drive GPIO with basic timer?)

Re: STM32F4 SPI Communication Issue with RA8875 Display Controller

Re: Not all timer interrupts working on STM32F407 (shared timer IRQ settings)

Re: 8 pulse pin outputs on the STM32F407 (Drive GPIO with basic timer?)

Re: HAL_UART_Receive_IT not resetting after HAL_UART_Transmit

Re: HAL_UART_Receive_IT not resetting after HAL_UART_Transmit