【国民技术N32项目移植】N32WB452芯片移植--2、串口输出重定向

准备工作

查看SDK原有的log.c源码

打开官方提供的 Nationstech.N32WB452_Library.2.0.0压缩包，可以在projects/n32wb452_EVAL/bsp/src/log.c文件内看到以下内容。

/***************************************************************************** *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.*****************************************************************************/ /*** [url=home.php?mod=space&uid=1455510]@file[/url] log.c *[url=home.php?mod=space&uid=40524]@author[/url] Nations* [url=home.php?mod=space&uid=644434]@version[/url] v1.0.1 ** [url=home.php?mod=space&uid=855824]@copyright[/url] Copyright (c) 2019, Nations Technologies Inc. All rights reserved. */ #include "log.h" #if LOG_ENABLE void log_init(void) { GPIO_InitType GPIO_InitStructure; USART_InitType USART_InitStructure; // close JTAG RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO | LOG_PERIPH_GPIO, ENABLE); if (LOG_REMAP) { if (LOG_REMAP == GPIO_RMP3_USART2) { // release PB4 GPIO_ConfigPinRemap(GPIO_RMP_SW_JTAG_NO_NJTRST, ENABLE); } GPIO_ConfigPinRemap(LOG_REMAP, ENABLE); } LOG_ENABLE_PERIPH_CLK(LOG_PERIPH, ENABLE); GPIO_InitStructure.Pin = LOG_TX_PIN; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitPeripheral(LOG_GPIO, &GPIO_InitStructure); // GPIO_InitStructure.Pin = LOG_RX_PIN; // GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; // GPIO_InitPeripheral(LOG_GPIO, &GPIO_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_TX; // init uart USART_Init(LOG_USARTx, &USART_InitStructure); // enable uart USART_Enable(LOG_USARTx, ENABLE); } static int is_lr_sent = 0; int fputc(int ch, FILE *f) { if (ch == '\r') { is_lr_sent = 1; } else if (ch == '\n') { if (!is_lr_sent) { USART_SendData(LOG_USARTx, (uint8_t)'\r'); /* Loop until the end of transmission */ while (USART_GetFlagStatus(LOG_USARTx, USART_FLAG_TXDE) == RESET) { } } is_lr_sent = 0; } else { is_lr_sent = 0; } USART_SendData(LOG_USARTx, (uint8_t)ch); /* Loop until the end of transmission */ while (USART_GetFlagStatus(LOG_USARTx, USART_FLAG_TXDE) == RESET) { } return ch; } #ifdef USE_FULL_ASSERT__WEAK void assert_failed(const uint8_t*expr, const uint8_t *file, uint32_t line) { log_error("assertion failed: `%s` at %s:%d", expr, file, line); while (1) { } } #endif // USE_FULL_ASSERT #endif // LOG_ENABLE

这里我们可以看出，SDK源码通过projects/n32wb452_EVAL/bsp/inc/log.h里log串口部分定义，指定了log输出的串口，并重写了fputc，这样使用printf函数时，就会调用fputc，把内容输出到串口去。

现在我们要移植到腾讯TinyOS上，就需要将串口初始化部分代码调整到bsp目录里，然后在bsp代码里实现输出函数。

下面是调整后的代码（因个人书写习惯的原因，部分写法有区别）

#ifdef__GNUC__/* With GCC, small printf (option LD Linker->Libraries->Small printf set to 'Yes') calls __io_putchar() */#definePUTCHAR_PROTOTYPE int __io_putchar(char ch)#defineGETCHAR_PROTOTYPE int __io_getchar()#else#definePUTCHAR_PROTOTYPE int fputc(char ch)#defineGETCHAR_PROTOTYPE int fgetc()#endif/* __GNUC__ */staticintis_lr_sent =0; PUTCHAR_PROTOTYPE {if(ch =='\r') { is_lr_sent =1; }elseif(ch =='\n') {if(!is_lr_sent) {USART_SendData(LOG_USARTx, (uint8_t)'\r');/* Loop until the end of transmission */while(USART_GetFlagStatus(LOG_USARTx, USART_FLAG_TXDE) == RESET) { } } is_lr_sent =0; }else{ is_lr_sent =0; }USART_SendData(LOG_USARTx, (uint8_t)ch);/* Loop until the end of transmission */while(USART_GetFlagStatus(LOG_USARTx, USART_FLAG_TXDE) == RESET) { }returnch; }

_write函数定义在utils组件中

int_write(intfile, char *ptr,intlen) {intDataIdx;for(DataIdx =0; DataIdx <len; DataIdx++) { __io_putchar(*ptr++); }returnlen; }

串口初始化代码调整到bsp目录，其他内容不变。
然后编译测试，可以得到正确的输出。