[MCU] 【国民技术低功耗系列N32L43x测评】1、开发板开箱

前言   

    前两天刚好有事回家，直到今天才到快递站取回板子准备测评工作。在此，首先非常感谢EEWORLD论坛，提供平台及举办各种开发板和模组的测评活动，也感谢国民技术提供的测评板。话不多说，下面就开始进入本期的开箱介绍。

1、开箱

    打开包装盒，可以看到，官方除了提供开发板外，还很贴心的提供了一根mini-usb接口的通讯线。

    拿出开发板，板载外设也是一目了然。除了常见的led，按键外，测评板将mcu上所有IO引脚引出，方便后续对mcu的开发及使用。此外，板上还集成了NS-LINK模块，通过板上的mini-usb接口（DEBUG USB)，可以很方便的对开发板进行烧录或调试。

2、资料下载

    关于资料部分，论坛上有开发资料包，也可以直接到官方服务器下载，地址如下：

    【国民技术 N32 MCU 开发资料包】--N32L43x系列

    FTP服务器：ftp://58.250.18.138

     可以看到，官方提供的资料还是很齐全的，从基本的mcu用户和数据手册，硬件原理图，到开发环境的搭建说明等，对于新手来说还是特别友好的。

3、开发环境搭建

     关于开发环境的搭建，从文档资料可以看到，官方提供了多种开发环境应用文档指导。这里我选择较为熟悉的MDK keil作为基本的开发环境，只需要安装好官方提供的pack包，就可以直接在MDK keil下编译及调试工程项目了。

4、工程demo演示

    关于工程demo的演示，就usart输出"hello world"作为演示工程。

     从原理图可以看出，PA9，PA10可复用为USART输出脚使用，这里我直接使用USB-TTL模块，需要把J5上的跳线断开。

     直接使用官方提供的例程，编译烧录。

/*****************************************************************************
 * Copyright (c) 2019, Nations Technologies 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:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Nations' name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL NATIONS 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.
 * ****************************************************************************/

/**
 * @File main.c
 * @author Nations
 * @version v1.0.0
 *
 * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
 */
#include <stdio.h>
#include "main.h"

/** @addtogroup N32L43X_StdPeriph_Examples
 * @{
 */

/** @addtogroup USART_Printf
 * @{
 */

USART_InitType USART_InitStructure;

/**
 * @brief  Main program
 */
int main(void)
{
    /* System Clocks Configuration */
    RCC_Configuration();

    /* Configure the GPIO ports */
    GPIO_Configuration();

    /* USARTy and USARTz configuration ------------------------------------------------------*/
    USART_StructInit(&USART_InitStructure);
    USART_InitStructure.BaudRate            = 115200;
    USART_InitStructure.WordLength          = USART_WL_8B;
    USART_InitStructure.StopBits            = USART_STPB_1;
    USART_InitStructure.Parity              = USART_PE_NO;
    USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
    USART_InitStructure.Mode                = USART_MODE_RX | USART_MODE_TX;

    /* Configure USARTx */
    USART_Init(USARTx, &USART_InitStructure);
    /* Enable the USARTx */
    USART_Enable(USARTx, ENABLE);

    /* Output a message on Hyperterminal using printf function */
    printf("\n\rUSART Printf Example: retarget the C library printf function to the USART\n\r");
    printf("hello world. \r\n");

    while (1)
    {
    }
}

/**
 * @brief  Configures the different system clocks.
 */
void RCC_Configuration(void)
{
    /* Enable GPIO clock */
    GPIO_APBxClkCmd(USARTx_GPIO_CLK, ENABLE);
    /* Enable USARTx Clock */
    USART_APBxClkCmd(USARTx_CLK, ENABLE);
}

/**
 * @brief  Configures the different GPIO ports.
 */
void GPIO_Configuration(void)
{
    GPIO_InitType GPIO_InitStructure;

    /* Initialize GPIO_InitStructure */
    GPIO_InitStruct(&GPIO_InitStructure);

    /* Configure USARTx Tx as alternate function push-pull */
    GPIO_InitStructure.Pin            = USARTx_TxPin;
    GPIO_InitStructure.GPIO_Mode      = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Alternate = USARTx_Tx_GPIO_AF;
    GPIO_InitPeripheral(USARTx_GPIO, &GPIO_InitStructure);
    
    /* Configure USARTx Rx as alternate function push-pull and pull-up */
    GPIO_InitStructure.Pin            = USARTx_RxPin;
    GPIO_InitStructure.GPIO_Pull      = GPIO_Pull_Up;
    GPIO_InitStructure.GPIO_Alternate = USARTx_Rx_GPIO_AF;
    GPIO_InitPeripheral(USARTx_GPIO, &GPIO_InitStructure);
}

/* retarget the C library printf function to the USART */
int fputc(int ch, FILE* f)
{
    USART_SendData(USARTx, (uint8_t)ch);
    while (USART_GetFlagStatus(USARTx, USART_FLAG_TXDE) == RESET)
        ;

    return (ch);
}

#ifdef USE_FULL_ASSERT

/**
 * @brief  Reports the name of the source file and the source line number
 *         where the assert_param error has occurred.
 * @param file pointer to the source file name
 * @param line assert_param error line source number
 */
void assert_failed(const uint8_t* expr, const uint8_t* file, uint32_t line)
{
    /* User can add his own implementation to report the file name and line number,
       ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

    /* Infinite loop */
    while (1)
    {
    }
}

#endif

/**
 * @}
 */

/**
 * @}
 */

最后演示结果如下：  

谢谢分享，期待后续！