MQX Software SolutionsのトピックMQX UART lost characters with ESP8266

MQX UART lost characters with ESP8266

mqxman — Wed, 08 Apr 2015 16:34:58 GMT

Hello!

I learning the basics of MQX system on KWIKSTIK K40. Now I trying to communicate with ESP8266 wifi module over UART5 in interrupt mode.

My program send AT commands to the module, then I waiting for response in form of interrupt, finally I print it to the console.

This is going well on BAUD RATE 9600.

Here is the response:

AT+CIOBAUD=9600

AT+GMR

0018000902-AI03

But when I change BAUD RATE to 115200 I lost some of characters:

AAUD=115200

<a whole of line is missing

0018000902-AI03

Or at BAUD RATE 921600:

0018000902-AI03

This function is called by the interrupt:

void uart5_isr(pointer user_isr_ptr) {     MY_ISR_STRUCT_PTR  isr_ptr = (MY_ISR_STRUCT_PTR)user_isr_ptr;     isr_ptr->TICK_COUNT++;     UART_MemMapPtr sci_ptr = _bsp_get_serial_base_address (5);         if((sci_ptr->S1 & UART_S1_RDRF_MASK) == UART_S1_RDRF_MASK)     {         received_char = sci_ptr->D;         strcat(received_string,&received_char);     }     (*isr_ptr->OLD_ISR)(isr_ptr->OLD_ISR_DATA); }

My first question is: why the characters are missing and how to prevent it?

The second: Is this a correct form of handling an interrupt or can It do better?

Iam just learning of MQX... I attach the source code.

Thank You!

Original Attachment has been moved to: main.c.txt.zip

Re: MQX UART lost characters with ESP8266

Luis_Garabo — Mon, 13 Apr 2015 22:15:51 GMT

Hi Norbert,

I strongly suggest to follow the same way the appnote AN4022 is reading and changing UART to read from an external device. The link to the appnote is this:

http://cache.freescale.com/files/32bit/doc/app_note/AN4022.pdf

The link to the source code is here:

http://cache.freescale.com/files/32bit/doc/app_note/AN4022SW.zip

This should resolve your issue.

Have a great day,
Garabo

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Re: MQX UART lost characters with ESP8266

oleglavrukhin — Wed, 23 Sep 2015 20:20:24 GMT

Hi, Norbert!

Do you get the desired result with ESP8266?

I try to do the same as you, with ESP8266 and FRDM-K64.

Can You send me final source code for communication with ESP?

Regards, Oleg

Re: MQX UART lost characters with ESP8266

mqxman — Tue, 01 Dec 2015 20:41:15 GMT

Hello, no I think there is a problem in ESP8266 firmware, when I switch to another FW this solved my problem.

Try ESP8266 on arduino it is much more better than AT+ commands.

Re: MQX UART lost characters with ESP8266

Luis_Garabo — Tue, 08 Dec 2015 18:11:16 GMT

Hi Oleg,

Update the ESP8266 firmware verstion to the latest (1.4) I did and the communication is more stable.

Regards,

Garabo