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+// Copyright (C) 2020 Michael McMaster <michael@codesrc.com>
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+//
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+// This file is part of SCSI2SD.
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+//
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+// SCSI2SD is free software: you can redistribute it and/or modify
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+// it under the terms of the GNU General Public License as published by
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+// the Free Software Foundation, either version 3 of the License, or
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+// (at your option) any later version.
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+//
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+// SCSI2SD is distributed in the hope that it will be useful,
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+// GNU General Public License for more details.
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+//
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+// You should have received a copy of the GNU General Public License
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+// along with SCSI2SD. If not, see <http://www.gnu.org/licenses/>.
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+
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+#include "hwversion.h"
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+#include "stm32f2xx.h"
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+#include "config.h"
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+#include "time.h"
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+
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+// Store hardware version details to the "One Time Programmable" flash memory
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+// This is 512 bytes that can only be written to ONCE and once only.
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+// It can be read by dfu-util, so once we write the marker it can be
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+// detected even when the firmware isn't running.
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+
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+// Values for STM32F401RE
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+const size_t OTP_SIZE = 512;
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+const size_t OTP_BLOCKS = 16;
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+const size_t OTP_BLOCK_SIZE = OTP_SIZE / OTP_BLOCKS;
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+
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+const size_t OTP_BLOCK_NUM = 0;
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+
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+// Define some pointers for writing, but also to allow easy reading back values
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+#define FLASH_OTP_BASE 0x1FFF7800
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+const uint8_t *otp = (uint8_t*)(FLASH_OTP_BASE + OTP_BLOCK_NUM * OTP_BLOCK_SIZE);
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+const uint32_t *otp32 = (uint32_t*)(FLASH_OTP_BASE + OTP_BLOCK_NUM * OTP_BLOCK_SIZE);
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+const uint8_t *lock = (uint8_t*)(FLASH_OTP_BASE + OTP_SIZE + OTP_BLOCK_NUM);
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+
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+const uint32_t marker = 0x06002020;
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+
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+static void
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+checkHwSensePins()
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+{
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+ // Check the board version is correct.
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+ // Sense pins are configued as pullup, and connected to GND for 2020 hw,
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+ // or N/C for v6 ref F or older
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+ if (HAL_GPIO_ReadPin(VER_ID1_GPIO_Port, VER_ID1_Pin) ||
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+ HAL_GPIO_ReadPin(VER_ID2_GPIO_Port, VER_ID2_Pin))
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+ {
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+ // Oh dear, wrong version. Do not pass go.
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+ while (1) {}
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+ }
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+}
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+
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+void
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+s2s_checkHwVersion()
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+{
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+ checkHwSensePins();
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+
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+ // Write a marker to flash that can be read by dfu-util now that we know
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+ // the version is correct.
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+ if (*otp32 != marker)
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+ {
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+ // Double-check the pins are good.
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+ s2s_delay_ms(10);
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+ checkHwSensePins();
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+
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+ // Well, pins are good. Make sure marker isn't set at all
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+ if (*otp32 != 0xffffffff)
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+ {
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+ // Some other version was set.
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+ while (1) {}
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+ }
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+
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+ // Write the marker to flash.
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+ if (HAL_FLASH_Unlock() != HAL_OK)
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+ {
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+ return;
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+ }
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+
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+ // Write 4 bytes to the start of OTP.
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+ if (HAL_FLASH_Program(
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+ FLASH_TYPEPROGRAM_WORD,
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+ (uint32_t)otp,
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+ marker) != HAL_OK)
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+ {
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+ HAL_FLASH_Lock();
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+ return;
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+ }
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+
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+ // Lock OTP page
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+ if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_BYTE, (uint32_t)lock, 0x00)) {
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+ HAL_FLASH_Lock();
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+ return;
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+ }
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+
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+ HAL_FLASH_Lock();
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+ }
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+}
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+
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Michael McMaster