serial: stubbed

JaCzekanski · Apr 30, 2020 · e1d08a8 · e1d08a8
1 parent 709c21f
commit e1d08a8
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Showing 2 changed files with 20 additions and 2 deletions.
diff --git a/src/device/serial.cpp b/src/device/serial.cpp
@@ -5,12 +5,20 @@ Serial::Serial() { reset(); }
 
 void Serial::step() {}
 
-void Serial::reset() { status._reg = 0x00000005; }
+void Serial::reset() { status._reg = 0xffff; }
 
 uint8_t Serial::read(uint32_t address) {
+    if (address == 0) {
+        fmt::print("[SERIAL] Rx: ?\n");
+
+        return '?';
+    }
     if (address >= 4 && address < 8) {
         return status._byte[address - 4];
     }
+    if (address >= 10 && address < 12) {
+        return control._byte[address - 10];
+    }
     if (address >= 14 && address < 16) {
         return baud._byte[address - 14];
     }
@@ -20,8 +28,17 @@ uint8_t Serial::read(uint32_t address) {
 }
 
 void Serial::write(uint32_t address, uint8_t data) {
-    // fmt::print("[SERIAL] write @ 0x{:02x}: 0x{:02x}\n", address, data);
+    if (address == 0) {
+        fmt::print("[SERIAL] TX: 0x{:02x}\n", data);
+        return;
+    }
+    if (address >= 10 && address < 12) {
+        control._byte[address - 10] = data;
+        return;
+    }
     if (address >= 14 && address < 16) {
         baud._byte[address - 14] = data;
+        return;
     }
+    fmt::print("[SERIAL] write @ 0x{:02x}: 0x{:02x}\n", address, data);
 }
diff --git a/src/device/serial.h b/src/device/serial.h
@@ -4,6 +4,7 @@
 class Serial {
     static const uint32_t BASE_ADDRESS = 0x1F801050;
     Reg32 status;
+    Reg16 control;
     Reg16 baud;
 
     void reset();