[ion/device/n0110] Methods to read and write PCB version in OTP

ion/src/device/n0100/drivers/board.cpp

@@ -230,6 +230,12 @@ void shutdownClocks(bool keepLEDAwake) {
   RCC.AHB1ENR()->set(ahb1enr);
 }
 
+PCBVersion readPCBVersion() {
+  return PCB_LATEST;
+}
+
+void writePCBVersion(PCBVersion) {}
+
 }
 }
 }

ion/src/device/n0110/drivers/board.cpp

@@ -1,6 +1,8 @@
 #include <drivers/board.h>
 #include <drivers/cache.h>
+#include <drivers/internal_flash.h>
 #include <drivers/config/clocks.h>
+#include <drivers/config/internal_flash.h>
 #include <drivers/external_flash.h>
 #include <regs/regs.h>
 #include <ion.h>
@@ -370,6 +372,25 @@ void shutdownClocks(bool keepLEDAwake) {
   RCC.AHB1ENR()->set(ahb1enr);
 }
 
+constexpr int pcbVersionOTPIndex = 0;
+
+/* As we want the PCB versions to be in ascending order chronologically, and
+ * because the OTP are initialized with 1s, we store the bitwise-not of the
+ * version number. This way, devices with blank OTP are considered version 0. */
+
+PCBVersion readPCBVersion() {
+  /* FIXME: When flashing for the first time after assembling the device, this
+   * should return PCB_LATEST. */
+  return ~*reinterpret_cast<const PCBVersion *>(InternalFlash::Config::OTPAddresses[pcbVersionOTPIndex]);
+}
+
+void writePCBVersion(PCBVersion version) {
+  /* TODO: We also need to lock the OTP in which the version has been written. */
+  uint8_t * destination = reinterpret_cast<uint8_t *>(InternalFlash::Config::OTPAddresses[pcbVersionOTPIndex]);
+  PCBVersion formattedVersion = ~version;
+  InternalFlash::WriteMemory(destination, reinterpret_cast<uint8_t *>(&formattedVersion), sizeof(formattedVersion));
+}
+
 }
 }
 }

ion/src/device/shared/drivers/board.h

@@ -1,6 +1,8 @@
 #ifndef ION_DEVICE_SHARED_DRIVERS_BOARD_H
 #define ION_DEVICE_SHARED_DRIVERS_BOARD_H
 
+#include <stdint.h>
+
 namespace Ion {
 namespace Device {
 namespace Board {
@@ -23,6 +25,11 @@ Frequency standardFrequency();
 void setStandardFrequency(Frequency f);
 void setClockFrequency(Frequency f);
 
+typedef uint32_t PCBVersion;
+
+PCBVersion readPCBVersion();
+void writePCBVersion(PCBVersion version);
+
 }
 }
 }