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#ifndef CM3CPP_FLASH_OTP_HPP_
#define CM3CPP_FLASH_OTP_HPP_
#include <libopencm3/stm32/flash.h>
#include <libopencmsis/core_cm3.h>
namespace cm3cpp {
namespace flash {
enum class OtpBlock : uint8_t
{
BLOCK_0,
BLOCK_1,
BLOCK_2,
BLOCK_3,
BLOCK_4,
BLOCK_5,
BLOCK_6,
BLOCK_7,
BLOCK_8,
BLOCK_9,
BLOCK_10,
BLOCK_11,
BLOCK_12,
BLOCK_13,
BLOCK_14,
BLOCK_15,
};
enum class OtpByte
{
BYTE_0,
BYTE_1,
BYTE_2,
BYTE_3,
BYTE_4,
BYTE_5,
BYTE_6,
BYTE_7,
BYTE_8,
BYTE_9,
BYTE_10,
BYTE_11,
BYTE_12,
BYTE_13,
BYTE_14,
BYTE_15,
BYTE_16,
BYTE_17,
BYTE_18,
BYTE_19,
BYTE_20,
BYTE_21,
BYTE_22,
BYTE_23,
BYTE_24,
BYTE_25,
BYTE_26,
BYTE_27,
BYTE_28,
BYTE_29,
BYTE_30,
BYTE_31,
};
enum class Flag
{
BSY = FLASH_SR_BSY,
PGSERR = FLASH_SR_PGSERR,
PGPERR = FLASH_SR_PGPERR,
PGAERR = FLASH_SR_PGAERR,
WRPERR = FLASH_SR_WRPERR,
OPERR = FLASH_SR_OPERR,
EOP = FLASH_SR_EOP,
};
class FlashOtp
{
public:
static void write(OtpBlock block, OtpByte byte, uint8_t data)
{
flash_unlock();
clear_flag(Flag::EOP);
clear_flag(Flag::OPERR);
clear_flag(Flag::WRPERR);
clear_flag(Flag::PGAERR);
clear_flag(Flag::PGPERR);
clear_flag(Flag::PGSERR);
flash_wait_for_last_operation();
uint32_t address = _OTP_START_ADDR +
((uint32_t)block * _OTP_BYTES_IN_BLOCK) +
(uint32_t)byte;
__disable_irq();
flash_program_byte(address, data);
__enable_irq();
flash_lock();
}
static uint8_t read(OtpBlock block, OtpByte byte)
{
uint32_t address = _OTP_START_ADDR +
((uint32_t)block * _OTP_BYTES_IN_BLOCK) +
(uint32_t)byte;
return *(uint8_t*)address;
}
static const uint8_t* const get_pointer(OtpBlock block, OtpByte byte)
{
uint32_t address = _OTP_START_ADDR +
((uint32_t)block * _OTP_BYTES_IN_BLOCK) +
(uint32_t)byte;
return (uint8_t*)address;
}
static bool get_flag(Flag flag)
{
uint32_t status = FLASH_SR | (uint32_t)flag;
if (status > 0)
return true;
return false;
}
static void clear_flag(Flag flag)
{
if (flag == Flag::BSY)
return;
FLASH_SR |= (uint32_t)flag;
}
static void lock_block(OtpBlock block)
{
flash_unlock();
clear_flag(Flag::EOP);
clear_flag(Flag::OPERR);
clear_flag(Flag::WRPERR);
clear_flag(Flag::PGAERR);
clear_flag(Flag::PGPERR);
clear_flag(Flag::PGSERR);
flash_wait_for_last_operation();
uint32_t address = _OTP_LOCK_ADDR + static_cast<uint32_t>(block);
__disable_irq();
flash_program_byte(address, _OTP_LOCK_BLOCK);
__enable_irq();
flash_lock();
}
private:
static constexpr uint32_t _OTP_START_ADDR = (0x1FFF7800);
static constexpr uint32_t _OTP_LOCK_ADDR = (0x1FFF7A00);
static constexpr uint32_t _OTP_BLOCKS = 16;
static constexpr uint32_t _OTP_BYTES_IN_BLOCK = 32;
static constexpr uint32_t _OTP_SIZE = (_OTP_BLOCKS * _OTP_BYTES_IN_BLOCK);
static constexpr uint8_t _OTP_LOCK_BLOCK = 0x00;
};
} /* namespace flash */
} /* namespace cm3cpp */
#endif /* CM3CPP_FLASH_OTP_HPP_ */
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