[gd32l233c-start] 5. FLASH read / write - use internal flash to store data

1、 About GD32 Flash

GD32 flash Officially called FMC.

2、 About GD32L233CCT6 flash

Used this time GD32L233CCT6 flash The size is 256k;

It can be seen that , It is divided into 64 page , from 0-63 page , The size of each page is 4kb;

The manual says , Support 32 Bitwise integer sum 16 Bit half word programming , But library functions only have whole 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、 Read and write test

Use the last page （0x0803E000-0x0803 FFFF）, 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 phenomena

You can find , The written and read data are the same .

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