Not able to send the data without delay in UART interfacing. I am using 3 UART channel at a time. I want to know how can I remove the delay .

Hello ,

You can not use 3 different uart Channels for Runtime IO.

• if you want to remove the delay, You should increase the STACK SIZE
• If you want to interact with 3 uart Channels , i advice you to use a RTOS (Chibios or FreeRTOS) with 3 differents threads matching with 3 UARTs

we have already performed this task on Chibios with 2 UARTs

just a note, sd_lld_read is a blocking function

/**
 * @brief Low level serial driver read
 *
 * @param[in] sdp pointer to a @p SerialDriver object
 * @param[out] buffer data buffer receiver
 * @param[out] len number of bytes received
 *
 * @return The number of bytes effectively read.
 *
 * @api
 */
uint16_t sd_lld_read(SerialDriver* sdp, uint8_t* buffer, uint16_t len) {
 
 uint16_t ret;
 
 /* If the interrupts are disabled, reception is not possible otherwise the
 execution should be blocked till all bytes are received.*/
 if(irqGetExtIntEnable() == 0U) {
 ret = 0U;
 } else {
 
 if(sdp->config->api_mode != SPC5_LIN_API_MODE_BUFFERED_IO) {
 SPC5_LIN_RX_IN_PROGRESS(sdp);
	}
 
 /* Check if DMA is enabled.*/
#if (SPC5_SERIAL_DMA_MODE == SPC5_SERIAL_DMA_ON)
 /* Check if the LinFlex support DMA.*/
 if ((sdp->dma_supported == TRUE) && (sdp->config->dma_enable == TRUE)) {
 ret = sd_rx_dma(sdp, buffer, len);
 } else {
 ret = sd_rx(sdp, buffer, len);
 }
#else
 ret = sd_rx(sdp, buffer, len);
#endif
 
 if(sdp->config->api_mode != SPC5_LIN_API_MODE_BUFFERED_IO) {
 SPC5_LIN_WAIT_FOR_RX_COMPLETION(sdp);
	}
 }
 
 return ret;
}

check this application

SPC56ECxx_RLA Crypto Test Application

Best Regards

Erwan