text: /*
   * Copyright (c) 2013 - 2015, Freescale Semiconductor, Inc.
   * Copyright 2016-2017 NXP
   * All rights reserved.
   *
   * SPDX-License-Identifier: BSD-3-Clause
   */
  
  #include "pin_mux.h"
  #include "clock_config.h"
  #include "board.h"
  #include "fsl_lpuart.h"
  
  #include "fsl_debug_console.h"
  /*******************************************************************************
   * Definitions
   ******************************************************************************/
  #define DEMO_LPUART          CM4__LPUART
  #define DEMO_LPUART_CLKSRC   kCLOCK_M4_0_Lpuart
  #define DEMO_LPUART_CLK_FREQ CLOCK_GetIpFreq(kCLOCK_M4_0_Lpuart)
  
  /*******************************************************************************
   * Prototypes
   ******************************************************************************/
  
  /*******************************************************************************
   * Variables
   ******************************************************************************/
  
  uint8_t txbuff[]   = "Lpuart polling example\r\nBoard will send back received characters\r\n";
  uint8_t rxbuff[20] = {0};
  
  /*******************************************************************************
   * Code
   ******************************************************************************/
  
  /*!
   * @brief Main function
   */
  int main(void)
  {
      uint8_t ch;
      lpuart_config_t config;
  
      sc_ipc_t ipc;
      uint32_t freq;
  
      ipc = BOARD_InitRpc();
      BOARD_InitPins(ipc);
      BOARD_BootClockRUN();
  
      /* Power on Local LPUART for M4. */
      if (sc_pm_set_resource_power_mode(ipc, SC_R_M4_0_UART, SC_PM_PW_MODE_ON) != SC_ERR_NONE)
      {
          assert(false);
      }
  
      /* Set clock Frequncy of Local LPUART for M4. */
      freq = CLOCK_SetIpFreq(DEMO_LPUART_CLKSRC, SC_133MHZ);
      if (freq == 0)
      {
          assert(freq);
      }
  
      /*
       * config.baudRate_Bps = 115200U;
       * config.parityMode = kLPUART_ParityDisabled;
       * config.stopBitCount = kLPUART_OneStopBit;
       * config.txFifoWatermark = 0;
       * config.rxFifoWatermark = 0;
       * config.enableTx = false;
       * config.enableRx = false;
       */
      LPUART_GetDefaultConfig(&config);
      config.baudRate_Bps = BOARD_DEBUG_UART_BAUDRATE;
      config.enableTx     = true;
      config.enableRx     = true;
  
      LPUART_Init(DEMO_LPUART, &config, DEMO_LPUART_CLK_FREQ);
  
      LPUART_WriteBlocking(DEMO_LPUART, txbuff, sizeof(txbuff) - 1);
  
      while (1)
      {
          LPUART_ReadBlocking(DEMO_LPUART, &ch, 1);
          LPUART_WriteBlocking(DEMO_LPUART, &ch, 1);
      }
  }
  