AC7801 chip serial port printing problem

felsh

AC7801 chip serial port printing problem [Copy link]

 

 

Following the previous post, after debugging, I thought about printing through the serial port, and found some problems. The program is to change the LED flashing frequency by pressing keys, and there is no problem with debugging. The key is that I output a data through printf, and there is a problem. I used two serial port debugging assistants but did not receive data, and there was no display (the port and baud rate settings are all correct) (it is USB to serial port). Attached picture, please help, please help, where is the problem?

felsh

Don't sink

felsh

Help

felsh

IAR compiled

felsh

There is no problem with program debugging, and the LED flashes normally

littleshrimp

Are printf related functions defined?

wangerxian

Do I need to turn on the [RTS/CTS] function?

nmg

Can you provide the program? Find someone on the forum who has tested this board and can help you test it.

felsh

nmg posted on 2022-8-22 22:09 Can you provide the program? Find someone in the forum who has tested this board and can help you test it

Sure, how can I send it to you?

felsh

wangerxian posted on 2022-8-22 17:56 Do I need to turn on the [RTS/CTS] function?

I'm not sure about this.

felsh

littleshrimp posted on 2022-8-22 17:55 Are printf-related functions defined?

Is that so?

felsh

nmg posted on 2022-8-22 22:09 Can you provide the program? Find someone in the forum who has tested this board and can help you test it

I posted another post with the program attached.

Serial port printing problem of domestic AC7801X chip (with program) https://bbs.eeworld.com.cn/thread-1215482-1-1.html

wangerxian

felsh posted on 2022-8-23 08:38 I’m not sure about this

Use the serial port assistant to open this and try to see if it can communicate normally!

littleshrimp

felsh posted on 2022-8-23 08:39 Is that so?

int fputc(int ch, FILE *f) You need to write the serial port output function here

felsh

littleshrimp posted on 2022-8-23 09:25 int fputc(int ch, FILE *f) You need to write the serial port output function here

1. int fputc(int ch, FILE *f)
2. {
3. /* Send one byte of data */
4. EUSCI_A_UART_transmitData(EUSCI_A1_BASE, (int8_t) ch);
6. /* Wait for sending to complete */
7. while (EUSCI_A_UART_queryStatusFlags(EUSCI_A1_BASE, EUSCI_A_UART_BUSY) != RESET);
9. return (ch);
10. }
11. This kind of thing, will it always report errors?
12. 

felsh

wangerxian posted on 2022-8-23 09:12 Use the serial port assistant to turn this on and see if it can communicate normally!

I didn't find this. I used these two assistants.

wangerxian

felsh posted on 2022-8-23 09:57 I didn't find this, these two assistants I used

Download a friendly serial port assistant.

littleshrimp

Where did you copy the EUSCI_A_UART_queryStatusFlags function from? Look at the definition of RESET there.

felsh

wangerxian posted on 2022-8-23 10:44 Download a friendly serial port assistant.

OK

felsh

littleshrimp posted on 2022-8-23 10:52 Where did you copy the EUSCI_A_UART_queryStatusFlags function? Look at the definition of RESET there

Nothing is defined, just copied directly from the Internet. I saw a lot of such redefinitions, but they don't work in my program.