About jlaufer

jlaufer · 2025-03-16

Hi! I'm using an STM32F401RET6 and was planning on using both USART1 in Asynchronous mode and USB_OTG_FS peripherals.In STM32CubeIDE when they are configured at the same time there is an error. I've tried PA9/10 and PB6/7 for TX/RX for USART1 but the...

jlaufer · 2025-02-24

Hello! I've designed a PCB using STM32F407vgt6 but I cannot get it to connect using ST-LINK/V2 via the SWD interface. When I try to connect using STM32 ST-LINK Utility, I get the following error: Can not connect to target!"Connect Under Reset" mode f...

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 · 2025-03-16

@STTwo-32 Thanks for the response. I'm concerned about the yellow warning sign next to USART1 and the red highlighted "Hardware Flow Control (RS232)". Does this just mean I can't use in the Hardware Flow Control feature?

jlaufer · 2025-02-24

Thank you! Since I'm not using the analog peripherals, can I simply add a jumper across FB1, or is proper filtering required?

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.

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USB_OTG_FS and USART1 Async on same board

STM32f407vgt6 stlink v2 not connecting on PCB

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

Re: USB_OTG_FS and USART1 Async on same board

Re: STM32f407vgt6 stlink v2 not connecting on PCB

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?)