[GD32L233C-START Review] 5. Flash Read and Write - Using Internal Flash to Store Data

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[GD32L233C-START Review] 5. Flash Read and Write - Using Internal Flash to Store Data [Copy link]

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1. About GD32 Flash

GD32 flash is officially called FMC.

2. About GD32L233CCT6 flash

The GD32L233CCT6 flash used this time has a size of 256k;
As can be seen, it is divided into 64 pages, from page 0 to page 63, and the size of each page is 4kb;

The manual says that 32-bit full word and 16-bit half word programming is supported, but the library function only supports full word programming.

3. Code implementation

#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. Reading and Writing Test

Use the last page (0x0803E000-0x0803 FFFF) to test reading and writing.

#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. Experimental phenomenon

It can be found that the written and read data are the same.