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1 简述在APROM上执行源代码, 更新LDROM内存, 再读回做确认 1.1 环境需求设定l M051系列芯片 x 1 l 此示例需在APROM上运行 1.2 芯片设定l HCLK =外部晶振 (4~24MHz) l FMC设定: n 使能ISP功能与LDROM更新功能 (LDUEN = 1) 1.3 示例目录l App_Src 示例主程序 l Lib_Src M051系列启动文件(*.s) 以及FMC的源代码 l Lib_Inc Lib_Src源代码的头文件以及M051系列寄存器的定义 2 程序介绍 2.1 Main 函数初始化系统时钟以及FMC. 对地址0x10_0000 - 0x10_01FF做页擦除 (1页=512 bytes), 再对地址0x10_0000写入32-bit的数据. 最后, 再将地址0x10_0000的内存数据读回. 读回的数据应该要和写入的数据相同. uint32_tdata = 0x87654321 ; int32_tmain (void) { uint32_t add = 0x00100000 ; // LDROM基地址 UnlockReg(); // 关掉寄存器写保护 SYSCLK->PWRCON |=SYSCLK_PWRCON_XTL12M_EN_Msk; while(!(SYSCLK->CLKSTATUS &CLK_CLKSTATUS_HXT_STB)); SYSCLK->CLKSEL0 = 0; // 选择外部时钟作为系统时钟 FMC_Open(); // 使能ISP时钟,ISP功能,以及LDROM更新功能 FMC_Erase(add); // 擦除LDROM页 (Address 0x100000~0x1001FF) FMC_Write(add, 0x12505678); // 写数据0x12505678到LDROM(地址 0x100000) data=FMC_Read(add) ; // 读LDROM地址 (Address 0x100000) while(1) ; }
2.2 FMC_Open函数(ldrom.c)使能ISP时钟与功能，并且使能LDROM更新功能 voidFMC_Open(void) { SYSCLK->AHBCLK |= 4 ; // 使能ISP时钟 FMC->ISPCON |= FMC_ISPCON_ISPEN_Msk ; // 使能ISP功能 FMC->ISPCON |= FMC_ISPCON_LDUEN_Msk ; // 使能LDROM更新功能 }
2.3 FMC_Erase,FMC_Write, FMC_Read函数(ldrom.c)FMC_Erase, FMC_Write,FMC_Read分别为页擦除, 烧写, 以及读取内存三个函数. voidFMC_Erase(uint32_t u32addr) { FMC->ISPCMD = FMC_ISPCMD_PAGE_ERASE; // ISP命令:页擦除 FMC->ISPADR = u32addr ; FMC->ISPTRG = 0x1 ; while(FMC->ISPTRG) ; } voidFMC_Write(uint32_t u32addr, uint32_t u32data) { FMC->ISPCMD = FMC_ISPCMD_PROGRAM ; // ISP命令:字编程 FMC->ISPADR = u32addr ; FMC->ISPDAT = u32data ; FMC->ISPTRG = 0x1 ; while(FMC->ISPTRG) ; } uint32_tFMC_Read(uint32_t u32addr) { FMC->ISPCMD = FMC_ISPCMD_READ ; // ISP命令:字读取 FMC->ISPADR = u32addr ; FMC->ISPDAT = 0 ; FMC->ISPTRG = 0x1 ; while(FMC->ISPTRG) ; return FMC->ISPDAT ; }
3 运行结果对地址做写入数据0x12505678前，变量data的值设为：0x87654321 在完成写入后，读回LDROM地址0x10_0000的内容后，变量data变成了0x12505678，与写入值相同。
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