一. stm32的FLASH分为
1.主存储块:用于保存具体的程序代码和用户数据,主存储块是以页为单位划分的,
一页大小为1KB。范围为从地址0x08000000开始的128KB内。
2.信息块 :用于负责由stm32出厂是放置2KB的启动程序(Bootloader)和512B的用户配置信息区
二.操作原则
对Flash 的写入操作要 “先擦除后写入”的原则;
stm32的内置flash 编程操作都是以页为单位写入的,而写入的操作必须要以16位半字宽度数据位单位,允许跨页写,写入非16位数据时将导致stm32内部总线错误。
进行内置flash读写时,必须要打开内部Rc振荡器。
头文件:
#ifndef __BSP_FLASH_H #define __BSP_FLASH_H #include "stm32f10x.h" typedef enum { FLASH_WRITE_OK = 1, FLASH_WRIKE_NO = 0, FLASH_READ_OK = 1, FLASH_READ_NO = 0 }FLASH_FLAG ; extern unsigned char FLASH_WRITE(unsigned short int * memory_data); extern unsigned char FLASH_READ(unsigned short int * memory_data,unsigned short int n); #endif /* __LED_H */
读写函数:
#include "bsp_flash.h" FLASH_FLAG FLASH_STATUS; static u32 count = 0; /**--------------------------------------------------------------------------------- * @brief FLASH写入必不可少步骤 * @param 输入数据起始地址 * @retval 函数有无执行完毕 --------------------------------------------------------------------------------*/ unsigned char FLASH_WRITE(unsigned short int * memory_data) { static int t; count = 0; /*Enables or disables the Internal High Speed oscillator (HSI).*/ RCC_HSICmd(ENABLE); /*打开FLASH可擦除控制器*/ FLASH_Unlock(); /*将flash三个标志位全清*/ FLASH_ClearFlag(FLASH_FLAG_EOP|FLASH_FLAG_PGERR|FLASH_FLAG_WRPRTERR); FLASH_ErasePage(0x8002000); t = sizeof((const char *)memory_data); while(count <= t) { /*flash 为一个字节存储,16位数据必须地址加2*/ FLASH_ProgramHalfWord((0x8002000 +count*2),*(memory_data+count)); count++; if(count > t) { FLASH_STATUS = FLASH_WRIKE_NO; return FLASH_STATUS; } } /* Locks the FLASH Program Erase Controller.*/ FLASH_Lock(); RCC_HSICmd(DISABLE); FLASH_STATUS = FLASH_WRITE_OK; return FLASH_STATUS; } /**--------------------------------------------------------------------------------- * @brief FLASH读出函数 * @param memory_data:输出存放地址,n 输出个数 * @retval 函数有无执行完毕 --------------------------------------------------------------------------------*/ unsigned char FLASH_READ(unsigned short int * memory_data,unsigned short int n) { count = 0; while(count < n) { *(memory_data+count) = *(u16 *)(0x8002000 + count*2); printf(" %d ",*(memory_data+count)); //读取 count++; if(count > n) { FLASH_STATUS = FLASH_READ_NO; return FLASH_STATUS; } } //FLASH_ErasePage(0x8002000); FLASH_STATUS = FLASH_READ_OK; return FLASH_STATUS; } /*********************************************END OF FILE**********************/