Trikarus/firmware_smartstepper_trikarus/stepper_nano_zero/eeprom.cpp
2020-07-20 22:21:36 +02:00

310 lines
8.1 KiB
C++

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#include "eeprom.h"
#include "calibration.h"
#include "Flash.h"
#include "board.h" //for divide with rounding macro
#include <Arduino.h>
#include "syslog.h"
//since we will write the following structure into each page, we need to find our latest page
// to do this we will use the header to contain a checksum and write counter.
#define EEPROM_SIZE (FLASH_ROW_SIZE*2)
typedef struct {
uint16_t checksum;
uint16_t count;
}eepromHeader_t;
#define EEPROM_DATA_SIZE (FLASH_PAGE_SIZE_NZS-sizeof(eepromHeader_t))
typedef struct {
eepromHeader_t header;
uint8_t data[EEPROM_DATA_SIZE];
} eepromData_t;
static eepromData_t EEPROMCache;
static int32_t NextPageWrite=-1;
//we need to reserve two pages for EEPROM
__attribute__((__aligned__(FLASH_ROW_SIZE))) const uint8_t NVM_eeprom[EEPROM_SIZE]={0xFF};
static uint16_t checksum(uint8_t *ptrData, uint32_t nBytes)
{
uint16_t sum=0;
uint32_t i;
i=0;
//LOG("running checksum %d",nBytes);
while(i<nBytes)
{
sum += ptrData[i];
i++;
}
return sum;
}
static bool isPageGood(uint32_t page)
{
eepromData_t *ptrData;
uint16_t cs;
ptrData=(eepromData_t *)&NVM_eeprom[page];
cs=checksum(ptrData->data, EEPROM_DATA_SIZE);
//LOG("checksum is %d %d",cs,ptrData->header.checksum);
if (cs==ptrData->header.checksum)
{
//LOG("Page good %d",page);
return true;
}
//LOG("page bad %d",page);
return false;
}
static void printEEPROM(uint32_t page)
{
eepromData_t *ptrData;
int i;
ptrData=(eepromData_t *)&NVM_eeprom[page];
LOG("count %d", ptrData->header.count);
LOG("checksum %d", ptrData->header.checksum);
for (i=0; i<10; i++)
{
LOG("Data[%d]=%02X",i,ptrData->data[i]);
}
}
static uint32_t findLastGoodPage(void)
{
uint32_t lastGoodPage=0;
uint32_t page;
uint16_t lastCnt=0;
eepromData_t *ptrData;
page=0;
while(page < (EEPROM_SIZE))
{
//LOG("checking page %d",page);
if (isPageGood(page))
{
ptrData=(eepromData_t *)&NVM_eeprom[page];
//check for roll over which is OK
if (lastCnt==16534 && ptrData->header.count==1)
{
lastCnt=ptrData->header.count;
lastGoodPage=page;
}
if (ptrData->header.count>lastCnt)
{
//make sure we have not rolled over.
if ((ptrData->header.count-lastCnt)<(16534/2))
{
lastCnt=ptrData->header.count;
lastGoodPage=page;
}
}
}
page=page + FLASH_PAGE_SIZE_NZS;
}
//LOG("last good page %d",lastGoodPage);
return lastGoodPage;
}
//find the next page to write
static uint32_t eepromGetNextWritPage(void)
{
eepromHeader_t *ptrHeader;
uint32_t page;
uint32_t row;
int blockCount;
int done=0;
//start at first address:
page=0;
while(page < (EEPROM_SIZE))
{
//LOG("checking page %d",page);
ptrHeader=(eepromHeader_t *) &NVM_eeprom[page];
if (ptrHeader->count == 0xFFFF)
{
uint32_t i;
uint8_t *ptrData;
//uint8_t erasedByte=(uint8_t)ptrHeader->count;
bool erased=true;
//verify page is erased
ptrData= (uint8_t *)&NVM_eeprom[page];
for (i=0; i<FLASH_PAGE_SIZE_NZS; i++)
{
if (ptrData[i] != FLASH_ERASE_VALUE)
{
erased=false;
break;
}
}
if (erased)
{
//LOG("Found Page %d erased",page);
return page;
}
}
page=page+FLASH_PAGE_SIZE_NZS;
}
//if we get get here all the pages are full...
// we need to find the page with last good data.
page=findLastGoodPage();
//find which row the page is in
row=page/FLASH_ROW_SIZE;
//increment to next row for erase
row++;
if ((row*FLASH_ROW_SIZE)>=EEPROM_SIZE)
{
row=0;
//TODO we should make sure this not where good data is
// however if it is what should we do?
}
//now we need to erase that row
//WARNING("Erasing page %d",row*FLASH_ROW_SIZE);
flashErase(&NVM_eeprom[row*FLASH_ROW_SIZE],FLASH_ROW_SIZE);
page=row*FLASH_ROW_SIZE;
//LOG("Next free page is %d",page);
return page;
}
eepromError_t eepromInit(void)
{
uint32_t page;
//find the last good page offset in flash
page=findLastGoodPage();
LOG("EEPROM Init found page %d",page);
if (isPageGood(page))
{
LOG("EEPROM page good %d",page);
memcpy(&EEPROMCache, &NVM_eeprom[page], sizeof(EEPROMCache));
NextPageWrite=eepromGetNextWritPage();
return EEPROM_OK;
}
//ERROR("page is bad");
memset(&EEPROMCache, 0, sizeof(EEPROMCache));
NextPageWrite=eepromGetNextWritPage();
return EEPROM_CORRUPT;
}
int eepromWriteCache(uint8_t *ptrData, uint32_t size)
{
//LOG("Cache write %d",size);
if (NextPageWrite==-1) //some one did not init the module
{
//lets handle gracefully and do it ourselves
eepromInit();
}
if (size>EEPROM_DATA_SIZE)
{
size =EEPROM_DATA_SIZE;
}
memcpy(EEPROMCache.data, ptrData, size);
EEPROMCache.header.checksum=checksum(EEPROMCache.data,EEPROM_DATA_SIZE);
return size;
}
int eepromRead(uint8_t *ptrData, uint32_t size) //returns number of bytes actually read, whcih could be less than size requested
{
if (NextPageWrite==-1) //some one did not init the module
{
//lets handle gracefully and do it ourselves
eepromInit();
}
if (size>EEPROM_DATA_SIZE)
{
size =EEPROM_DATA_SIZE;
}
if (EEPROMCache.header.count == 0)
{
return 0; //cache is new/corrupt
}
memcpy(ptrData, EEPROMCache.data, size);
return size;
}
eepromError_t eepromFlush(void) //flush the cache to flash memory
{
if (NextPageWrite==-1)
{
ERROR("EEPROM WRITE FAILED");
return EEPROM_FAILED; //most likely no one has written to cache
}
EEPROMCache.header.count++;
if (EEPROMCache.header.count>=16535)
{
EEPROMCache.header.count=1;
}
//WARNING("Writting to Page %d",NextPageWrite);
flashWrite(&NVM_eeprom[NextPageWrite], &EEPROMCache, sizeof(EEPROMCache));
// printEEPROM(NextPageWrite);
if (!SYSCTRL->PCLKSR.bit.BOD33DET) //if not in brown out condition find next write location
{
//LOG("getting next page to write");
NextPageWrite=eepromGetNextWritPage(); //find next write location and erase if needed
} else
{
//LOG("BOD active");
NextPageWrite=-1; //else we will just clear NextPageWrite location just in case we recover from brown out
}
return EEPROM_OK;
}