【GD32L233C-START评测】5、Flash读写——使用内部Flash存储数据
[复制链接]
相关文章:
【GD32L233C-START评测】1、优点与缺点都很明显的GD32L233C-START(开箱)
【GD32L233C-START评测】2、非阻塞方式点灯,blink,blink,blink……
【GD32L233C-START评测】3、pwm实现呼吸灯
【GD32L233C-START评测】4、串口不定长数据接收
1、关于GD32 Flash
GD32 flash官方称为FMC。
2、关于GD32L233CCT6 flash
本次使用的GD32L233CCT6 flash大小为256k;
可以看出,分为64页,从0-63页,每页大小为4kb;
手册上说,支持32位整字和16位半字编程,但是库函数只有整字编程。
3、代码实现
#define FLASH_PAGE_SIZE 0x1000 //4k
void FlashWrite(uint16_t len,uint8_t *data,uint32_t addr_start)
{
uint16_t i=0;
uint32_t temp=0;
uint32_t addr=addr_start;
fmc_state_enum fmc_state=FMC_READY;
fmc_unlock();
for(i=0;i<len/4;i++)
{
temp = (data[0]<<0)+(data[1]<<8)+(data[2]<<16)+(data[3]<<24);
fmc_state=fmc_word_program(addr, temp);
if(fmc_state!=FMC_READY)
{
return;
}
fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGAERR | FMC_FLAG_PGERR);
data += 4;
addr += 4;
}
if((len % 4)==3)
{
temp = (data[0]<<0)+(data[1]<<8)+(data[2]<<16);
temp = temp | 0xff000000;
fmc_state=fmc_word_program(addr,temp);
fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGAERR | FMC_FLAG_PGERR);
}
else
{
if((len % 4)==2)
{
temp = (data[0]<<0)+(data[1]<<8);
temp = temp | 0xffff0000;
fmc_state=fmc_word_program(addr,temp);
fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGAERR | FMC_FLAG_PGERR);
}
else
{
if((len % 4)==1)
{
temp = (data[0]<<0);
temp = temp | 0xffffff00 ;
fmc_state=fmc_word_program(addr,temp);
fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGAERR | FMC_FLAG_PGERR);
}
}
}
fmc_lock();
}
void FlashRead(uint16_t len,uint8_t *outdata,uint32_t addr_start)
{
uint32_t addr;
uint16_t i;
addr = addr_start;
for(i=0;i<len;i++)
{
*outdata = *(uint8_t*) addr;
addr = addr + 1;
outdata++;
}
}
void FlashErase(uint32_t start, uint32_t end)
{
uint32_t EraseCounter;
fmc_state_enum fmc_state=FMC_READY;
/* unlock the flash program/erase controller */
fmc_unlock();
/* clear all pending flags */
fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGAERR | FMC_FLAG_PGERR);
/* erase the flash pages */
while(start < end)
{
EraseCounter = start/FLASH_PAGE_SIZE;
fmc_state=fmc_page_erase(EraseCounter*FLASH_PAGE_SIZE);
if(fmc_state!=FMC_READY)
{
return;
}
fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGAERR | FMC_FLAG_PGERR);
start += FLASH_PAGE_SIZE;
}
/* lock the main FMC after the erase operation */
fmc_lock();
}
4、读写测试
使用最后一页(0x0803E000-0x0803 FFFF),测试读写。
#define APP_DATA_SATRT_ADDR 0x0803E000 //4k
#define TEST_DATA_LEN 11
uint8_t WriteData[TEST_DATA_LEN]={1,2,3,4,5,6,7,8,9,10,11};
uint8_t ReadData[TEST_DATA_LEN]={0,0,0,0,0,0,0,0,0,0 ,0};
void FlashTest(void)
{
FlashErase(APP_DATA_SATRT_ADDR, APP_DATA_SATRT_ADDR+FLASH_PAGE_SIZE);
FlashWrite(TEST_DATA_LEN,WriteData,APP_DATA_SATRT_ADDR);
FlashRead(TEST_DATA_LEN,ReadData, APP_DATA_SATRT_ADDR);
printf("Write Data[");
for(uint8_t i=0;i<TEST_DATA_LEN;i++)
{
printf(" %d",WriteData[i]);
}
printf("]\r\n");
printf("Read Data[");
for(uint8_t i=0;i<TEST_DATA_LEN;i++)
{
printf(" %d",ReadData[i]);
}
printf("]\r\n");
}
5、实验现象
可以发现,写入的和读出的数据是一样的。
|