SPS how to disable hardware flow control

Question

Hi, 
 Working with project dsps_device from DA145xx_SPS v. 6.150.6.77. I want to communicate with my MCU through 2 wires at 115200 baud. I do not have enough pins available to implement four wires serial port. I am struggling to find a clean way to remove the hardware flow control. Please help, 
 Thanks, 
 R&eacute;mi

OV_Renesas · Accepted Answer

Hi Remi, Thank you for posting your question online. The SPS SDK is supported with 4-Wire UART. The HW Flow Control is mandatory in order to ensure the Extended Sleep and prevent data loss during communication. Please refer on dma_uart_sps.c file, on the dma_uart_sps_init API: void dma_uart_sps_init(UART_BAUDRATE baudr, uint8_t mode)
{
 GPIO_RegisterCallback(GPIO0_IRQn, dma_uart_gpio_callback);

 bool pin_status = GPIO_GetPinStatus(gpio_uart1_cts.port, gpio_uart1_cts.pin);
 dma_uart_sps_cts_update(pin_status);

 const uart_cfg_t dma_uart_cfg =
 {
 .uart_err_cb = uart_user_no_err_expected_cb,
 .uart_tx_cb = dma_uart_tx_callback,
 .uart_rx_cb = dma_uart_rx_callback,
 .data_bits = UART_DATABITS_8,
 .parity = UART_PARITY_NONE,
 .stop_bits = UART_STOPBITS_1,
 .use_fifo = UART_FIFO_EN,
 .auto_flow_control = UART_AFCE_EN,
 .uart_dma_priority = DMA_PRIO_7,
 .baud_rate = baudr,
 .uart_dma_channel = UART_DMA_CHANNEL_01,
 };
 uart_initialize(DSPS_UART, &dma_uart_cfg);
}
 If you modify the dma_uart_cfg (auto_flow_control variable) you can disable the HW Flow Control but it is not supported by us. Best Regards, OV_Renesas

SPS how to disable hardware flow control

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