【国民技术N32项目移植】超轻量级嵌入式Python引擎pikascript移植 1.实现串口下载和交互

介绍

嵌入式脚本组件 (pikascript.com)

PikaScript是一个超轻量级的Python引擎，它可以在只有4KB RAM和32KB闪存的微控制器上运行。相比较流行的MicroPython，则需要至少16KB的RAM和256KB的空间存储代码。PikaScript具有完整的解释器，字节码和虚拟机架构。PikaScript支持裸机运行，而且支持Keil、IAR、rt-thread studio、segger embedded studio等IDE开发，零依赖，零配置，开箱即用，极易集成进已有的C工程。

移植

我是直接从官网下载了stm32g070cb的工程文件，在此基础上进行的移植。

首先，新建一个n32g4fr的keil工程，然后往工程里添加相关文件，细节如下图所示：

引入头文件路径

移植串口终端，用于脚本交互

主要是修改串口中断的处理函数

volatile static char rx_char = 0;
char UART1_RxBuff[RX_BUFF_LENGTH] = {0};
uint16_t UART1_RXBuff_offset = 0;
__attribute__((weak)) void __PIKA_USART1_IRQHandler(char rx_char) {}
void USART1_IRQHandler(void)
{
    if(USART_GetIntStatus(USART1, USART_INT_RXDNE) != RESET)
    {
        rx_char = USART_ReceiveData(USART1);
        __PIKA_USART1_IRQHandler(rx_char);
        /* clear buff when overflow */
        if(UART1_RXBuff_offset >= RX_BUFF_LENGTH)
        {
            UART1_RXBuff_offset = 0;
            memset(UART1_RxBuff, 0, sizeof(UART1_RxBuff));
        }
        /* recive char */
        UART1_RxBuff[UART1_RXBuff_offset] = rx_char;
        UART1_RXBuff_offset++;
        if('\n' == rx_char)
        {
            /* handle python script download */
            if(MCU_Code_reciveHandler(UART1_RxBuff, UART1_RXBuff_offset))
            {
                goto line_exit;
            }
line_exit:
            UART1_RXBuff_offset = 0;
            memset(UART1_RxBuff, 0, sizeof(UART1_RxBuff));
            return;
        }
    }
}

修改flash读写代码，方便下载python脚本

由于n32g4fr不支持64位写，因此需要将flash写的代码修改成32位写

void MCU_Code_flashHandler(void)
{
    if(!codeHeap.ena)
    {
        /* recive not activate */
        return;
    }
    if(uwTick - codeHeap.reciveTime < 200)
    {
        /* still reciving */
        return;
    }

    /* transmite is finished */
    MCU_Code_reciveHandler("\n\n", 2);


    uint32_t FirstPage = 0, NbOfPages = 0;
    uint32_t PageError = 0;
    __IO uint32_t data32 = 0, MemoryProgramStatus = 0;
//    static FLASH_EraseInitTypeDef EraseInitStruct = {0};

    printf("==============[Programer]==============\r\n");
    printf("[info]: Recived byte: %d\r\n", codeHeap.size);
    printf("[info]: Programing... \r\n");
    FLASH_Unlock();
    /* Get the 1st page to erase */
    FirstPage = GetPage(FLASH_SCRIPT_START_ADDR);
    printf("startAddr: 0x%08X, page:%d\r\n",FLASH_SCRIPT_START_ADDR,FirstPage);

    /* Get the number of pages to erase from 1st page */
    NbOfPages = GetPage(FLASH_SCRIPT_END_ADDR) - FirstPage + 1;
    printf("endAddr: 0x%08X,number of pages: %d\r\n",FLASH_SCRIPT_END_ADDR,NbOfPages);


    printf("[info]: Erasing flash... \r\n");
 

	for(uint32_t i=0;i<NbOfPages;i++)
	{
		if (FLASH_COMPL != FLASH_EraseOnePage(FLASH_SCRIPT_START_ADDR+i*FLASH_PAGE_SIZE))
		{
			printf("[error]: Erase faild! \r\n");
			while(1)
			{
			}
		}
	}
    printf("[ OK ]: Erase flash ok! \r\n");

    printf("[info]: Writing flash... \r\n");
    uint32_t baseAddress = FLASH_SCRIPT_START_ADDR;
    uint32_t writeAddress = 0;
    uint64_t writeData64 = 0;
	uint32_t writeData32 = 0;
    while(writeAddress < codeHeap.size + 1)
    {

		
		writeData32 = 0; 
        for(int i = 3; i >= 0; i--)
        {
            char ch = codeHeap.content[writeAddress + i];
            writeData32 = writeData32 << 8;
            writeData32 += ch;
			
        } 
        if (FLASH_COMPL == FLASH_ProgramWord(baseAddress + writeAddress, writeData32))        	
        {
            writeAddress = writeAddress + 4;
        }
        else
        {
            printf("[error]: Write flash faild. \r\n");
            while(1)
            {
            }
        }
		
		
    }
    FLASH_Lock();
    printf("[ OK ]: Write flash ok! \r\n");

    baseAddress = FLASH_SCRIPT_START_ADDR;
    MemoryProgramStatus = 0x0;

    printf("[info]: Checking flash... \r\n");
    char* codeInFlash = (char*)baseAddress;
    printf("\r\n");
    printf("----[code in flash]-----\r\n");
    for(int i = 0; i < strGetSize(codeHeap.content); i++)
    {
        if('\n' == codeHeap.content[i] && '\r' != codeHeap.content[i - 1])
        {
            fputc('\r', (FILE*)!NULL);
        }
        fputc(codeHeap.content[i], (FILE*)!NULL);
    }
    printf("----[code in flash]-----\r\n");
    printf("\r\n");

    if(!strEqu(codeInFlash, codeHeap.content))
    {
        printf("[error]: Check flash faild.\r\n");
        printf("\r\n");

        printf("\r\n\r\n");
        printf("---------[code in heap]----------\r\n");
        printf("\r\n");
        for(int i = 0; i < strGetSize(codeHeap.content); i++)
        {
            if('\n' == codeHeap.content[i])
            {
                fputc('\r', (FILE*)!NULL);
            }
            fputc(codeHeap.content[i], (FILE*)!NULL);
        }
        printf("\r\n\r\n");
        printf("---------[code in heap]----------\r\n");
        while(1)
        {
        }
    }
    printf("[ OK ]: Checking flash ok! \r\n");
    printf("[ OK ]: Programing ok! \r\n");
    printf("[info]: Restarting... \r\n");
    printf("==============[Programer]==============\r\n");

    printf("\r\n");
    /* System Reset */
    NVIC_SystemReset();
}

经过以上的内容基本就修改完成了。

效果展示

源码

*附件：pikapython_n32g4fr.zip