About Olly Kao

Olly Kao · 2020-09-23

I'm curious about the delay time between the title mentioned, I toggled an IO when I wrote data into UART->DR, the delay time varies from 3 micro seconds to 10x micro secondsint main(void) { /* initial code generated by STMCubeMX */ HAL_Init(); S...

Olly Kao · 2020-09-21

I'm writing a throw-catch case of 2 chips, the Host throws an message onto UART1 bus, then the Slave catches and shows message on UART2 for debugging, there are a delay between catch and throw, but the delay time is not always the same, in my opinion...

Olly Kao · 2020-09-16

I'm trying to transmit a newer data while the previous transmit interrupt hasn't finished, I simply just call HAL_UART_Transmit_IT again and the result is the first called interrupt will finish its whole job and the second call do nothing, I know the...

Olly Kao · 2020-09-07

HiI'm doing a project to detect collision on UART, when I get data from Rx, I will compare it with the data I transmitted, if there aren't the same, means collision occurred, then I will immediately stop my transmitting interrupt to stop sources wast...

Olly Kao · 2020-09-01

HiI'm doing a topic to detect the collision on RS485. Since I wish to stop transmitting when collision occurred, I need to know how's the bus look like, however while transmitting, the transmit enable pin pull high on SP485EEN, lead the receiving p...

Olly Kao · 2020-09-24

@Nikita91 Thanks for reply HAL_delay(50) delays 50 millisecondDo you know the time and process of the data begins to shift out of the TX pin???

Olly Kao · 2020-09-22

The process of HAL uart is HAL_UART_Transmit_IT -> USART2_IRQHandler -> HAL_UART_IRQHandler -> UART_Transmit_ITI toggled an IO pin inside the UART_Transmit_IT after the DR is writen, it shows that the time jitters is not caused by the process of HAL...

Olly Kao · 2020-09-22

@TZARDI I'm working on stm32F103CB

Olly Kao · 2020-08-30

The article :　https://magicjackting.pixnet.net/blog/post/135222109So the Frequency of UART doesn't need to match the multiply number of 9600?

Olly Kao · 2020-08-26

HI, Thanks for your reply.You're right, I originally used HAL_UART_Transmit() so the UART1 and UART2 can't work at the same time, as belowSo I just wrote a testing code to check for UART1 and UART2 work simultaneously, using HAL_UART_Transmit_IT(), a...

User statistics

User Activity

why is there a delay between (DR register written) and (data really showed) in UART on STM32F103CB?

what affects the delay time between message caught and respond of HAL_UART_Receive/Transmit_IT ??

how to cover previous HAL_UART_Transmit_IT with a newer one?

Stop Transmit interrupt manually during transmitting

Collision Detection on RS485 on STM32F103CB

Re: why is there a delay between (DR register written) and (data really showed) in UART on STM32F103CB?

Re: what affects the delay time between message caught and respond of HAL_UART_Receive/Transmit_IT ??

Re: what affects the delay time between message caught and respond of HAL_UART_Receive/Transmit_IT ??

Re: what is the crystal oscillator frequency of UART of STM32f103CB

Re: what is the the hardware fifo size of STM32f103CB and how to know whether the FIFO is empty or full?