Update IO devices upon processor reset #269

src/io/iobase.h

@@ -112,6 +112,12 @@ class IOBase : public QWidget {
    */
   virtual unsigned byteSize() const = 0;
 
+  /**
+   * @brief reset
+   * Hook for an IO device to run a reset procedure upon processor reset.
+   */
+  virtual void reset() {}
+
   /**
    * Read/write functions from processor
    */

src/io/ioledmatrix.h

@@ -34,6 +34,10 @@ class IOLedMatrix : public IOBase {
   virtual VInt ioRead(AInt offset, unsigned size) override;
   virtual void ioWrite(AInt offset, VInt value, unsigned size) override;
 
+  virtual void reset() override {
+    std::fill(m_ledRegs.begin(), m_ledRegs.end(), 0);
+  }
+
 protected:
   virtual void parameterChanged(unsigned) override { updateLEDRegs(); };
 

src/io/iomanager.cpp

@@ -29,6 +29,13 @@ QString IOManager::cSymbolsHeaderpath() const {
   }
 }
 
+void IOManager::reset() {
+  for (auto &device : m_peripherals) {
+    device->reset();
+    device->update();
+  }
+}
+
 AInt IOManager::nextPeripheralAddress() const {
   AInt base = 0;
   if (m_periphMMappings.empty()) {

src/io/iomanager.h

@@ -60,6 +60,12 @@ class IOManager : public QObject {
   std::vector<std::pair<Symbol, AInt>>
   assemblerSymbolsForPeriph(IOBase *peripheral) const;
 
+  /**
+   * @brief reset
+   * Call to reset all IO devices.
+   */
+  void reset();
+
 signals:
   void memoryMapChanged();
   void peripheralRemoved(QObject *peripheral);

src/processorhandler.cpp

@@ -8,6 +8,7 @@
 #include "assembler/program.h"
 #include "assembler/rv32i_assembler.h"
 #include "assembler/rv64i_assembler.h"
+#include "io/iomanager.h"
 
 #include "syscall/riscv_syscall.h"
 
@@ -272,6 +273,10 @@ void ProcessorHandler::_reset() {
   for (const auto &kv : m_currentRegInits) {
     _setRegisterValue(RegisterFileType::GPR, kv.first, kv.second);
   }
+
+  // Reset IO devices.
+  IOManager::get().reset();
+
   // Forcing memory values doesn't necessarily mean that the processor will
   // notify that its state changed. Manually trigger a state change signal, to
   // ensure this.