Nextion Communication issue

Forum|Forum|6 years ago
June 13, 2020
4 replies
2599 views

Hello

I have Nextion display. Ican control it with arduino library in Arduino ide good.

I am learning communication nextion without itead nextion library via uart.

I designed simply page in nextion. it has just a textbox named "t0".

I try send a word from STM32F103C8T6 , but i couldnt. This my code pls tell me what is wrong.I use STM32CubeIDE 1.3

Thanks for advance.

 //texte gonderelim
 
	 //char com_giden[]="merhaba";
	 //int ix = 0;
	 // sprintf(com_giden,"Sayi: %d",ix++);
	 char dizi[]="t0.txt=\"dene\"";
 
	 HAL_UART_Transmit(&huart2,(uint8_t*)dizi,strlen(dizi),20);
	// HAL_UART_Transmit(&huart2,(uint8_t*)com_giden,strlen(com_giden),20);
 
	 char bitis[]="0xff";
	 HAL_UART_Transmit(&huart2,(uint8_t*)0xff,strlen(0xff),20);
	 HAL_UART_Transmit(&huart2,(uint8_t*)0xff,strlen(0xff),20);
	 HAL_UART_Transmit(&huart2,(uint8_t*)0xff,strlen(0xff),20);
	 HAL_Delay(500);

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Tesla DeLorean

Guru

You can't just cast 0xFF to a pointer, and do strlen() on it either.

Use

uint8_t ch = 0xFF;

HAL_UART_Transmit(&huart2, &ch,1, 20);

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FLine.1Author

Associate II

I set baud 115200 in nextion and st mcu. it is ok.

I try this code but issue is continious. I cant send any data display but i can send data to pc via uart .

What is my fault?

 char dizi[]="t0.txt=\"dene\"\r\n";
 
	 HAL_UART_Transmit(&huart2,&dizi,strlen(dizi),50);
	// HAL_UART_Transmit(&huart2,(uint8_t*)dizi,strlen(dizi),20); or i tried this line same result
 
	 uint8_t ch = 0xFF;
	 HAL_UART_Transmit(&huart2, &ch, 1, 20);
	 HAL_UART_Transmit(&huart2, &ch, 1, 20);
	 HAL_UART_Transmit(&huart2, &ch, 1, 20);
 HAl_Delay(800);