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#ifndef CM3CPP_FLASH_CYCLE_H_
#define CM3CPP_FLASH_CYCLE_H_
#include <libopencm3/cm3/common.h>
#include <libopencm3/stm32/flash.h>
#include <libopencmsis/core_cm3.h>
namespace cm3cpp {
namespace flash {
enum FlashSector : uint32_t
{
SECTOR_0 = 0x08000000,
SECTOR_1 = 0x08004000,
SECTOR_2 = 0x08008000,
SECTOR_3 = 0x0800C000,
SECTOR_4 = 0x08010000,
SECTOR_5 = 0x08020000,
};
constexpr uint32_t USER_FLASH_END_ADDRESS = 0x080FFFFF;
template<typename T>
class FlashCycle
{
public:
FlashCycle(FlashSector sector)
{
_error = false;
_ifexist = false;
_flashSector = sector;
_startAddr = 0;
_endAddr = 0;
_getSectorAddrs();
_pLastContainer = _searchLastContainer();
}
bool write(T* newContainer)
{
if (_error) {
return (false);
}
uint32_t writeTo;
flash_unlock();
if (!_ifexist) {
writeTo = _startAddr;
_ifexist = true;
}
else if ((uint32_t)_pLastContainer >= (_endAddr - sizeof(T))) {
__disable_irq();
flash_erase_sector(5, 2);
__enable_irq();
writeTo = _startAddr;
}
else {
writeTo = (uint32_t)(_pLastContainer + 1);
}
uint8_t* pContainer = (uint8_t*)newContainer;
for (int i = 0; i < sizeof(T); i++) {
__disable_irq();
flash_program_byte(writeTo++, pContainer[i]);
__enable_irq();
}
flash_lock();
_pLastContainer = (T*)(writeTo - sizeof(T));
return (true);
}
T* get(void) { return (_pLastContainer); }
bool is_exist(void) { return (_ifexist); }
private:
bool _error;
bool _ifexist;
FlashSector _flashSector;
uint32_t _startAddr;
uint32_t _endAddr;
T* _pLastContainer;
static constexpr uint8_t NUM_SECTORS = 6;
void _getSectorAddrs(void)
{
_startAddr = (uint32_t)_flashSector;
if (_flashSector == FlashSector::SECTOR_1)
_endAddr = (uint32_t)FlashSector::SECTOR_2;
else if (_flashSector == FlashSector::SECTOR_2)
_endAddr = (uint32_t)FlashSector::SECTOR_3;
else if (_flashSector == FlashSector::SECTOR_3)
_endAddr = (uint32_t)FlashSector::SECTOR_4;
else if (_flashSector == FlashSector::SECTOR_4)
_endAddr = (uint32_t)FlashSector::SECTOR_5;
else if (_flashSector == FlashSector::SECTOR_5)
_endAddr = USER_FLASH_END_ADDRESS + 1;
if (!_startAddr)
_error = true;
}
T* _searchLastContainer(void)
{
if (_error) {
return (0);
}
T* addr = (T*)_startAddr;
_ifexist = true;
while ((uint32_t)addr <= (_endAddr - sizeof(T))) {
if (*(((uint8_t*)addr)) == 0xFF) {
if (addr == (T*)_startAddr) {
_ifexist = false;
return (addr);
// addr = 0;
}
break;
}
addr += 1;
}
return (addr - 1);
}
};
} /* namespace flash */
} /* namespace cm3cpp */
#endif /* CM3CPP_FLASH_CYCLE_H_ */
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