Are the two interrupts TXEIE and TCIE not repeated in STM32 serial port transmission?

一沙一世

Are the two interrupts TXEIE and TCIE not repeated in STM32 serial port transmission? [Copy link]

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In STM32 serial port transmission, aren't the two interrupts TXEIE and TCIE repeated? Aren't they both interrupts generated after the send register SBUF sends a BYTE? Aren't these two repeated?

ilovefengshulin

TXEIE: Transmit buffer empty interrupt, data may still be sent through the serial port.

TCIE: Data sent completed

damiaa

The two interrupt enable bits TXEIE and TCIE

TXE and TC two interrupt flags

TXE TDR register is empty, which means data is transferred from TDR to TSR. At this time, the data is shifted out of the serial port, and TDR can be written by software. The corresponding interrupt is generated. You can write the next byte to TDR after this.

TC The TC register is empty, which proves that the data transmission is complete and the transmitted byte is completely completed. The corresponding interrupt is generated.

Specifically, you can analyze the routine of stm32 serial port interrupt to understand how these two registers are used together.

chunyang

Since they are different interrupts, they will obviously not be repeated. This is a basic logic problem. As for the differences and their respective characteristics, you should read the device manual to understand them yourself.