2021免费正能量网站入口,动易网站模板免费,seo关键词优化报价价格,网站建设推广特色STM32F4X 内部FLASH使用 STM32F4X 内部FLASHSTM32F4X内部FLASH结构STM32F40X和STM32F41X内部FLASH结构STM32F42X和STM32F43X内部FLASH结构 STM32F4X内部FLASH操作例程internal_flash.hinternal_flash.cmain.c 在嵌入式开发中#xff0c;经常需要实时保存一些数据。如果工程的代… STM32F4X 内部FLASH使用 STM32F4X 内部FLASHSTM32F4X内部FLASH结构STM32F40X和STM32F41X内部FLASH结构STM32F42X和STM32F43X内部FLASH结构 STM32F4X内部FLASH操作例程internal_flash.hinternal_flash.cmain.c 在嵌入式开发中经常需要实时保存一些数据。如果工程的代码量比较大的话可以使用一些外部的存储器件进行数据的保存。如果工程的代码量比较小则可以利用MCU的内部FLASH进行数据的存储。 STM32F4X 内部FLASH
当我们把程序编译好之后下载到MCU之后下载器会把程序文件下载到MCU的内部FLASH中内部FLASH除非人为擦除否则会永久保存。内部FLASH除了可以保存代码之外还可以保存数据。STM32F4X的内部FLASH有以下特点。
STM32F40X和STM32F41X的内部FLASH容量是1MB而STM32F42X和STM32F43X的内部FLASH容量是2MB。STM32F4X的内部FLASH支持字节、半字、字和双字写入。STM32F4X的内部FLASH支持扇区擦除和全擦除。
STM32F4X内部FLASH结构
STM32F40X和STM32F41X内部FLASH结构 可以看到STM32F40X和STM32F41X将1MB的内部FLASH分成了12个扇区每个扇区的大小都不一样分别是4个16KB的扇区1个64KB的扇区和7个128KB的扇区。
STM32F42X和STM32F43X内部FLASH结构 STM32F42X和STM32F43X的内部FLASH结构跟STM32F40X和STM32F41X的差不多只是有点细微的差别。STM32F42X和STM32F43X将内部2MB的FLASH分成了2个块每个块是1MB每个块分成了12个扇区每个扇区的大小都不一样分别是4个16KB的扇区1个64KB的扇区和7个128KB的扇区。
STM32F4X内部FLASH操作
先将内部FLASH解锁擦除扇区往FLASH中写入数据读出写入的数据进行校验FLASH上锁
例程
internal_flash.h
#ifndef __INTERNAL_FLASH__H
#define __INTERNAL_FLASH__H#include stm32f4xx.h
#include stdio.h#define ADDR_FLASH_SERTOR_0 (0x8000000)
#define ADDR_FLASH_SERTOR_1 (0x8004000)
#define ADDR_FLASH_SERTOR_2 (0x8008000)
#define ADDR_FLASH_SERTOR_3 (0x800C000)
#define ADDR_FLASH_SERTOR_4 (0x8010000)
#define ADDR_FLASH_SERTOR_5 (0x8020000)
#define ADDR_FLASH_SERTOR_6 (0x8040000)
#define ADDR_FLASH_SERTOR_7 (0x8060000)
#define ADDR_FLASH_SERTOR_8 (0x8080000)
#define ADDR_FLASH_SERTOR_9 (0x80A0000)
#define ADDR_FLASH_SERTOR_10 (0x80C0000)
#define ADDR_FLASH_SERTOR_11 (0x80E0000) int flash_test(void);
unsigned int get_sector_index(unsigned int start_address);
int compare_u8_data(const unsigned char *src,unsigned int start_address,int len);
int compare_u16_data(const unsigned short *src,unsigned int start_address,int len);
int compare_u32_data(const unsigned int *src,unsigned int start_address,int len);
#endifinternal_flash.c
#include internal_flash.hstatic unsigned char test_data_u8[]
{
//随机数个数100每行显示个数10取值范围0到255157, 115, 145, 130, 66, 251, 215, 97, 214, 233,
69, 161, 177, 204, 140, 72, 143, 247, 248, 120,
219, 190, 224, 68, 45, 233, 65, 194, 17, 98,
166, 97, 10, 49, 75, 125, 214, 170, 129, 49,
244, 229, 84, 109, 100, 111, 108, 72, 174, 63,
49, 151, 37, 236, 51, 190, 109, 29, 200, 198,
59, 64, 247, 176, 92, 127, 148, 9, 249, 239,
173, 191, 25, 11, 37, 51, 103, 98, 159, 143,
54, 140, 157, 90, 194, 98, 233, 74, 184, 111,
53, 89, 249, 161, 254, 26, 155, 68, 182, 78,
};static unsigned short test_data_u16[]
{
//随机数个数100每行显示个数10取值范围256到6553510301, 24195, 26063, 23491, 30667, 1467, 25287, 28733, 28285, 649,
20974, 22870, 22983, 28195, 8943, 22043, 4696, 15632, 15502, 9559,
17054, 31636, 5956, 17834, 30344, 11887, 27433, 31707, 22671, 11207,
29976, 4975, 16375, 32866, 5901, 3451, 29778, 13592, 22481, 12726,
19015, 2184, 1498, 13778, 32145, 28939, 364, 28429, 27722, 31462,
29189, 16899, 5994, 22212, 27384, 17606, 3211, 11363, 17240, 18224,
7407, 1421, 9495, 13688, 1475, 25930, 5999, 2308, 28069, 24404,
2177, 15230, 23397, 17355, 6717, 28714, 2568, 13098, 13953, 18295,
15891, 11898, 11909, 4308, 32774, 30661, 26998, 20164, 24614, 22222,
26209, 16693, 10111, 5631, 5459, 27150, 6698, 19363, 19391, 16391,
};static unsigned int test_data_u32[]
{
//随机数个数100每行显示个数10取值范围65536到10000077260, 82517, 87839, 66237, 89695, 72376, 96222, 92678, 95797, 93033,
80246, 71041, 65849, 67378, 98262, 66674, 82041, 77441, 81670, 96973,
83937, 83480, 75533, 69009, 76105, 91653, 83731, 84311, 86195, 87253,
93123, 75563, 95693, 82693, 81139, 82842, 83646, 88761, 89735, 68620,
77854, 96176, 71826, 87637, 91718, 72568, 84671, 71302, 70603, 94686,
77552, 75529, 86341, 96681, 77604, 87789, 84565, 75144, 86686, 78462,
78822, 67912, 67140, 80409, 96178, 91978, 83013, 97086, 80136, 78389,
89854, 81895, 71373, 87784, 95007, 83992, 85698, 90803, 83209, 82360,
75268, 88518, 68987, 94879, 80601, 86505, 96622, 84208, 74665, 75118,
90429, 83369, 98123, 86628, 97033, 95608, 88707, 88590, 68700, 93137,
};unsigned int get_sector_index(unsigned int start_address)
{if(start_address ADDR_FLASH_SERTOR_0 start_address ADDR_FLASH_SERTOR_1)return FLASH_Sector_0;else if(start_address ADDR_FLASH_SERTOR_1 start_address ADDR_FLASH_SERTOR_2)return FLASH_Sector_1;else if(start_address ADDR_FLASH_SERTOR_2 start_address ADDR_FLASH_SERTOR_3)return FLASH_Sector_2;else if(start_address ADDR_FLASH_SERTOR_3 start_address ADDR_FLASH_SERTOR_4)return FLASH_Sector_3;else if(start_address ADDR_FLASH_SERTOR_4 start_address ADDR_FLASH_SERTOR_5)return FLASH_Sector_4;else if(start_address ADDR_FLASH_SERTOR_5 start_address ADDR_FLASH_SERTOR_6)return FLASH_Sector_5;else if(start_address ADDR_FLASH_SERTOR_6 start_address ADDR_FLASH_SERTOR_7)return FLASH_Sector_6;else if(start_address ADDR_FLASH_SERTOR_7 start_address ADDR_FLASH_SERTOR_8)return FLASH_Sector_7;else if(start_address ADDR_FLASH_SERTOR_8 start_address ADDR_FLASH_SERTOR_9)return FLASH_Sector_8;else if(start_address ADDR_FLASH_SERTOR_9 start_address ADDR_FLASH_SERTOR_10)return FLASH_Sector_9;else if(start_address ADDR_FLASH_SERTOR_10 start_address ADDR_FLASH_SERTOR_11)return FLASH_Sector_10;elsereturn FLASH_Sector_11;}int flash_test(void)
{unsigned int i,write_setor,ret 0;FLASH_Unlock();write_setor get_sector_index(ADDR_FLASH_SERTOR_6); // 判断FLASH地址的扇区索引/* 字节读写测试 */if(FLASH_EraseSector(write_setor,VoltageRange_3) ! FLASH_COMPLETE) // 扇区擦除printf(flash erase error\r\n);elseprintf(flash erase success\r\n);for(i 0;i sizeof(test_data_u8);i)FLASH_ProgramByte(ADDR_FLASH_SERTOR_6 i,test_data_u8[i]); // 写数据if(compare_u8_data(test_data_u8,ADDR_FLASH_SERTOR_6,sizeof(test_data_u8)) ! 0) // 比较{printf(flash write u8 error\r\n);ret 1;goto end;}else printf(flash write u8 success\r\n);/* 半字读写测试 */if(FLASH_EraseSector(write_setor,VoltageRange_3) ! FLASH_COMPLETE) // 扇区擦除 printf(flash erase error\r\n);elseprintf(flash erase success\r\n);for(i 0;i sizeof(test_data_u16);i)FLASH_ProgramHalfWord(ADDR_FLASH_SERTOR_6 i * 2,test_data_u16[i]); // 写数据if(compare_u16_data(test_data_u16,ADDR_FLASH_SERTOR_6,sizeof(test_data_u16)) ! 0) // 比较{printf(flash write u16 error\r\n);ret 1;goto end;}else printf(flash write u16 success\r\n);/* 字读写测试 */if(FLASH_EraseSector(write_setor,VoltageRange_3) ! FLASH_COMPLETE) // 扇区擦除 printf(flash erase error\r\n);elseprintf(flash erase success\r\n);for(i 0;i sizeof(test_data_u32);i)FLASH_ProgramWord(ADDR_FLASH_SERTOR_6 i * 4,test_data_u32[i]); // 写数据if(compare_u32_data(test_data_u32,ADDR_FLASH_SERTOR_6,sizeof(test_data_u32)) ! 0) // 比较 {printf(flash write u32 error\r\n);ret 1;goto end;}else printf(flash write u32 success\r\n);
end: FLASH_Lock();return ret;
}int compare_u8_data(const unsigned char *src,unsigned int start_address,int len)
{int i;for(i 0;i len;i){if(*((unsigned char *)(start_address i)) ! src[i])return 1;}return 0;
}
int compare_u16_data(const unsigned short *src,unsigned int start_address,int len)
{int i;for(i 0;i len;i){if(*((unsigned short *)(start_address i * 2)) ! src[i])return 1;}return 0;
}
int compare_u32_data(const unsigned int *src,unsigned int start_address,int len)
{int i;for(i 0;i len;i){if(*((unsigned int *)(start_address i * 4)) ! src[i])return 1;}return 0;
} main.c
#include stm32f4xx.h
#include delay.h
#include usart.h
#include internal_flash.hint main(void)
{int i;NVIC_PriorityGroupConfig(2);system_tick_init();bsp_usart_init(115200);if(flash_test() 0)printf(STM32F4X Internal Test Scuess\r\n);elseprintf(STM32F4X Internal Test Error\r\n);while(1){}}
