topic Re: SPC5748G LINFLEXD_UART Using RXCallback Missing even Bytes in MPC5xxx

SPC5748G LINFLEXD_UART Using RXCallback Missing even Bytes

cskwon — Fri, 29 Apr 2022 08:14:26 GMT

hello everyone

I am using SPC5748G.

I am using UART with LINFLEXD_UART2

The baudrate is 921600, and it is connected to the Wi-Fi module.

The data sent by the Wi-Fi module is processed in the callback with the install_rxcallback function.

The problem is that when I store the received data as an array, even bytes are missing.
ex:) If the total content to be received is "+eventapp:boot_complete",
The actual received data receives "+vnapbo_opee" and stores it in an array.

The callback function is as follows.

void WiFi_UART_Callback(void *driverState, uart_event_t event, void *userData) { char Str_Test = 0; // Disable interrupt INT_SYS_DisableIRQ(LINFLEXD2_RX_IRQn); INT_SYS_DisableIRQ(LINFLEXD2_TX_IRQn); // LINFLEXD_UART_DRV_ReceiveData(INST_WIFI_UART, &WiFi_UART_RX_Buffer, 1U); WiFi_Received_Data[WiFi_Received_Count] = WiFi_UART_RX_Buffer; WiFi_Received_Count++; // Str_Test = strstr(WiFi_Received_Data, "complete"); if(WiFi_Received_Count >= 20) { Str_Test = 0xFF; } // // Enable interrupt INT_SYS_EnableIRQ(LINFLEXD2_RX_IRQn); INT_SYS_EnableIRQ(LINFLEXD2_TX_IRQn); }

The clock settings are as follows.

LIN2_CLK - Interface Clock : F40, Clock Source : F80, Frequency : 80MHz

I don't know what the hell is the problem.

Thank you very much for your reply. thank you.

Re: SPC5748G LINFLEXD_UART Using RXCallback Missing even Bytes

PetrS — Mon, 02 May 2022 11:48:53 GMT

Hi,

can you decrease baudrate of the used Wi-Fi module? Maybe it is fast enough if also anything else is running and served. Also try to increase interrupt priority for used UART2 module.

BR, Petr

Re: SPC5748G LINFLEXD_UART Using RXCallback Missing even Bytes

cskwon — Mon, 02 May 2022 23:50:33 GMT

Hi. Thanks Reply

How to increase interrupt priority?

in processor expert??

Re: SPC5748G LINFLEXD_UART Using RXCallback Missing even Bytes

PetrS — Tue, 03 May 2022 07:55:52 GMT

Hi,

using INT_SYS_SetPriority(LINFLEXD2_RX_IRQn,15); // 15 (highest priority) down to 0
(lowest priority).

BR, Petr

Re: SPC5748G LINFLEXD_UART Using RXCallback Missing even Bytes

cskwon — Tue, 03 May 2022 10:46:29 GMT

Thanks, Solution

I changed Priority (changed to 15)
Sometimes data loss occurs.

Is there any other way to handle RX faster than the callback function?

BR.

Re: SPC5748G LINFLEXD_UART Using RXCallback Missing even Bytes

PetrS — Thu, 05 May 2022 12:01:28 GMT

Hi,

you can try to create circular buffer and use just SetRxBuffer function within rx callback, so do not call ReceiveData each time. Refer e.g. to UART_pal demo code.

BR, Petr