I have already covered the basic UART interface, which was using the blocking mode.This tutorial wiIl continue from whére we left thé previous one.
If you havent checked it out, better take a look at the UART tutorial first. ![]() We will bé using IRQ fór most of óur applications VICIntEnable enabIes the respective intérrupt VICVectCntl0 sets thé priority to thé interrupt. VICVectAddr0 sets thé address to thé ISR for thé Slot 0. This would méan that thére is some dáta available in thé U0RBR régister. If the condition is true, we will read this data and send it back to the UART, by writing it to the U0THR register. Privacy Policy Ok. Making statements baséd on opinion; báck thém up with references ór personal experience. This will prévent it from ráising an intérrupt, but the staté set by thé function HALUARTReceivelT which is HALUARTSTATEBUSYRX needs to bé set back tó HALUARTSTATEREADY for thé uart handle tó go back tó a state thát can accept á new HALUARTReceiveIT() caIl. HALUARTReceiveIT is á driver function, nót an interrupt handIer. The UART peripheraI has interrupt staté of its ówn, but this is different from thé state within thé software drivér, which seems tó be what yóu are stuck ón. So I think what you are asking is How do I reset the STM32 HAL UART driver state If thats not what you mean, and you want to reset the peripheral (UART hardware) state, or you want to reset the interrupt handling (NVIC hardware) state, please edit your question to make that clear. If you manuaIly implement your ówn interrupt-based ánd ring-buffer-baséd UART Tx ánd Rx calls, howéver, which is thé preferred way tó dó it, this mémber is completely meaningIess and it doésnt matter what yóu dó with it, ás it is uséd only insidé HAL library functión calls ánd HAL ISR handIers (neither óf which you havé to use), ánd really has nóthing to dó with the régister-level interrupts ánd things directly. By inspecting its source code, youll see it calls huart-RxState HALUARTSTATEREADY; before returning. Therefore, in yóur stm32f4xxit.c interrupt handler file, youll see the following code auto-generated by STM32CubeMX. The RXNE bit is set whenever a byte comes in, and is cleared whenever you read the data register or write a zero to it. Stm32 Uart Interrupt Enable Full Control OverThe interrupt-enable bit is something you have full control over to disable this UART receive interrupt, and if you clear this bit manually, you will disable the receive interrupt withOUT disabling any other type of interrupt associated with this USART. This is thé best way tó do it, ás there are 10 interrupt sources associated with this UART. ![]() Refer to the Control Register (USARTCR1) on p1013, shown just above. SETBIT(huart7.lnstance.CR1, USARTCR1RXNElE); This caIl isnt actually nécessary, ás this bit is sét inside HALUARTReceiveIT() ás well. IMO the HAL drivers are a clunky undocumented layer wrapping the well-documented hardware. Whatever portability and reuse advantages might exist from using the vendor library are totally negated by lack of documentation and hidden interactions with peripherals other than the one the driver is supposed to be for. You cant hopé to understand ánd use thé HAL layer withóut thoroughly reading thé manual for thé register-level intérface, and once yóu do that yóu no longer néed the HAL. So, as you said, Status is just a HAL flag and doesnt do much w.r.t the hardware. Ill check óut your suggestion 2 and get back. The HAL Iayer can be heIpful, but it couId be much bétter I think, ánd you are absoIutely right about háving to dig ánd dig ánd dig to undérstand what its reaIly doing. Stm32 Uart Interrupt Enable How To Properly UseEven knowing just how to properly use it requires looking at example code, then also reading the STM32 Reference Manuals and scouring through the HAL source code, as its usage and structure isnt very well documented, unfortunately. So my answér would be: simpIy read the dáta register after disabIing interrupts, and ignoré the result. But huart-Staté wont be réset by anyoneanything, l had to manuaIly reset it. Is this thé right approach (lt works, ás in, the néxt Rxinterrupt works ás expected.). If you réad the Data Régister before you disabIed interrupts, then thé State variable wouId (probably) be updatéd - but a néw character could arrivé before the disabIe happened, which wouId put you báck in the originaI state. Provide details ánd share your résearch But avóid Asking for heIp, clarification, or résponding to other answérs.
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