diff options
Diffstat (limited to 'examples/imx7d_sdb_m4/driver_examples/uart_imx/uart_polling/main.c')
-rw-r--r-- | examples/imx7d_sdb_m4/driver_examples/uart_imx/uart_polling/main.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/examples/imx7d_sdb_m4/driver_examples/uart_imx/uart_polling/main.c b/examples/imx7d_sdb_m4/driver_examples/uart_imx/uart_polling/main.c new file mode 100644 index 0000000..5888f6f --- /dev/null +++ b/examples/imx7d_sdb_m4/driver_examples/uart_imx/uart_polling/main.c @@ -0,0 +1,117 @@ +/* + * Copyright (c) 2015, Freescale Semiconductor, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * o Redistributions of source code must retain the above copyright notice, this list + * of conditions and the following disclaimer. + * + * o Redistributions in binary form must reproduce the above copyright notice, this + * list of conditions and the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * + * o Neither the name of Freescale Semiconductor, Inc. nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/////////////////////////////////////////////////////////////////////////////// +// Includes +/////////////////////////////////////////////////////////////////////////////// +#include <stdint.h> +#include <stdbool.h> +#include "uart_imx.h" +#include "board.h" + +/////////////////////////////////////////////////////////////////////////////// +// Consts +/////////////////////////////////////////////////////////////////////////////// +const uint8_t bufferData1[] = "\n\r++++++++++++++++ UART Send/Receive Polling Example +++++++++++++++++\n\r"; +const uint8_t bufferData2[] = "\n\rType characters from keyboard, the board will receive and then echo them to terminal screen\n\r"; + +static void UART_SendDataPolling(UART_Type *base, const uint8_t *txBuff, uint32_t txSize); +static void UART_ReceiveDataPolling(UART_Type *base, uint8_t *rxBuff, uint32_t rxSize); + +int main(void) +{ + // Setup UART init structure. + uart_init_config_t initConfig = { + .baudRate = 115200u, + .wordLength = uartWordLength8Bits, + .stopBitNum = uartStopBitNumOne, + .parity = uartParityDisable, + .direction = uartDirectionTxRx + }; + uint8_t rxChar = 0; + uint32_t byteCount = 0; + + /* Initialize board specified hardware. */ + hardware_init(); + + // Get current module clock frequency. + initConfig.clockRate = get_uart_clock_freq(BOARD_DEBUG_UART_BASEADDR); + + /* Initialize UART baud rate, bit count, parity, stop bit and direction. */ + UART_Init(BOARD_DEBUG_UART_BASEADDR, &initConfig); + + /* Set UART build-in hardware FIFO Watermark. */ + UART_SetTxFifoWatermark(BOARD_DEBUG_UART_BASEADDR, 16); + UART_SetRxFifoWatermark(BOARD_DEBUG_UART_BASEADDR, 1); + + /* Finally, enable the UART module */ + UART_Enable(BOARD_DEBUG_UART_BASEADDR); + + byteCount = sizeof(bufferData1); + UART_SendDataPolling(BOARD_DEBUG_UART_BASEADDR, bufferData1, byteCount); + + byteCount = sizeof(bufferData2); + UART_SendDataPolling(BOARD_DEBUG_UART_BASEADDR, bufferData2, byteCount); + + while (true) + { + /* Wait to receive input data */ + UART_ReceiveDataPolling(BOARD_DEBUG_UART_BASEADDR, &rxChar, 1u); + + /* Send any character that received */ + UART_SendDataPolling(BOARD_DEBUG_UART_BASEADDR, &rxChar, 1u); + } +} + +static void UART_SendDataPolling(UART_Type *base, const uint8_t *txBuff, uint32_t txSize) +{ + while (txSize--) + { + while (!UART_GetStatusFlag(base, uartStatusTxComplete)); + UART_Putchar(base, *txBuff++); + } +} + +static void UART_ReceiveDataPolling(UART_Type *base, uint8_t *rxBuff, uint32_t rxSize) +{ + while (rxSize--) + { + while (!UART_GetStatusFlag(base, uartStatusRxReady)); + *rxBuff = UART_Getchar(base); + rxBuff++; + + if (UART_GetStatusFlag(base, uartStatusRxOverrun)) + UART_ClearStatusFlag(base, uartStatusRxOverrun); + } +} + +/******************************************************************************* + * EOF + ******************************************************************************/ |