Solve the problem that gd32f207 serial port can receive but send 00

Share one you are developing GD32F207 A problem encountered due to negligence during serial port , After configuring the serial port , Check the serial port sending and receiving through the serial port assistant , It is found that the serial port can receive, but each time after receiving, the serial port assistant will receive a 00( That is to say, the serial port sent me a 00), Here I think this 00 It should be the phenomenon of unsuccessful sending , Because I have encountered unsuccessful configuration before , When using some serial assistant tools, you will also receive 00 The phenomenon , That means there is a problem with sending ( May be TX Incorrect pin configuration , Or sending is not enabled , It is also possible that there is a problem with the sending interrupt function ).

Later, I found that the problem was my own TX There is a problem with the mode of pin configuration , I started with GPIO_MODE_OUT_PP

gpio_init(GPIOB, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_10);  // Misconfiguration 

But because the serial port is multiplexed , So we should use "GPIO_MODE_AF_PP" Pattern .

gpio_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_10);   // Configured correctly 

After modifying it, the serial port transmission is successfully realized .

therefore , If a little friend also encounters such a problem , You can also check whether there is a problem with the configuration or whether the corresponding interrupt or enable is on , There may also be a problem with the writing of the interrupt function .

My level is limited , The above information is for reference only , If there are mistakes and irregularities , Your advice are most welcome .
Besides, it's not easy to create , Don't copy , If it helps you, I hope you can like it , thank you ~