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stenasc · 2017-08-26

Posted on August 27, 2017 at 00:02Hello Forum,I have a function that I call to read data from Uart4. As there are a number of critical times that I need Uart4 interrupt disabled, I enable the interrupt on entry to the function and disable it after p...

stenasc · 2017-05-15

Posted on May 15, 2017 at 10:40Hi Forum,I'm using the stm32f091RCt6, (LQFP64) to set up USART4Kind RegardsBob USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; // Enable GPIOC clock ...

stenasc · 2017-05-09

Posted on May 09, 2017 at 11:14Hello Forum,I'm using usart3 of an stm32f090 to establish RS485 comms (not using DMA) in half duplex mode. DE is controlled using a GPIO pin. To transmit I drive this GPIO pin high for the complete duration of the TX a...

stenasc · 2017-04-18

Posted on April 18, 2017 at 23:07Hi Forum,I'm using the stm32f091, but when I enable the USART3 interrupt, the system hard faults. I already use USARTS1 and 2 without any problem. Not sure what else is required, so I'd be grateful for some assistanc...

stenasc · 2016-11-16

Posted on November 16, 2016 at 10:07Hi Forum,I'm looking to implement USART3 on the stm32091, but get the following error error: #20: identifier ''USART3_4_IRQn'' is undefined. when I compile at the following line. NVIC_InitStructure.NVIC_IRQChann...

stenasc · 2017-09-10

Posted on September 10, 2017 at 22:20Hi Clive,I appreciate the replies. I did dump out all the NVIC registers based on the interrupt hardware (the combination of OR and AND gates). That is how I determined which flags were being set. To solve, I dis...

stenasc · 2017-09-05

Posted on September 06, 2017 at 00:52Hi Forum,After some work, I was able to fix the issue but a question remains. I checked all the flags that would cause and interrupt and a number were being set. e.g. USART_FLAG_ORE, USART_FLAG_TC and USART_FLAG_...

stenasc · 2017-09-01

Posted on September 01, 2017 at 21:52Hi Clive,As you said, the interrupt is continually triggering after it is re-enabled. The interrupt is exited but then triggers again, resulting in it never returning to the main loop. I've tried reading all the ...

stenasc · 2017-08-30

Posted on August 31, 2017 at 00:17Hi Clive,Here is the offending code....void USART3_8_IRQHandler(void){ uint8_t rx_byteby = 0; USART_ClearITPendingBit(USART4, USART_IT_RXNE); //Clear any pending uart interrupts bits ...

stenasc · 2017-08-30

Posted on August 30, 2017 at 13:46What !! Couldn't be Clive but I have no reason to doubt you. I'll post up the exact handler C code later this evening, It was very similar to the handler code you posted. How on earth could I call it from within th...

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Disabling Uart4 interrupt causes lockup

Usart4 no TX

RS485 receive working but no transmit

Hard Fault When I enable the USART3_8_IRQn interrupt.

USART3_4_IRQn undefined

Re: Disabling Uart4 interrupt causes lockup

Re: Disabling Uart4 interrupt causes lockup

Re: Disabling Uart4 interrupt causes lockup

Re: Disabling Uart4 interrupt causes lockup

Re: Disabling Uart4 interrupt causes lockup