From da54b3b6d3db776eb57ca502822558577e6c4c4e Mon Sep 17 00:00:00 2001
From: uvok
Date: Mon, 19 Jan 2026 20:16:34 +0100
Subject: Add halt state and flag

---
 eater_cpu/cpp/Veater_computer__main.cpp | 7 +++++--
 eater_cpu/cpp/simpc_term.cpp            | 4 ++--
 2 files changed, 7 insertions(+), 4 deletions(-)

(limited to 'eater_cpu/cpp')

diff --git a/eater_cpu/cpp/Veater_computer__main.cpp b/eater_cpu/cpp/Veater_computer__main.cpp
index 315d52a..7afa4d0 100644
--- a/eater_cpu/cpp/Veater_computer__main.cpp
+++ b/eater_cpu/cpp/Veater_computer__main.cpp
@@ -20,6 +20,8 @@ void load_program(const std::unique_ptr<Veater_computer> &topp) {
   topp->eater_computer->RAM->r_datastore[1] = 0x1f;
   // OUT
   topp->eater_computer->RAM->r_datastore[2] = 0xe0;
+  // HALT
+  topp->eater_computer->RAM->r_datastore[3] = 0xf0;
   // Data @ 14
   topp->eater_computer->RAM->r_datastore[14] = 14;
   // Data @ 15
@@ -53,7 +55,8 @@ int main(int argc, char **argv, char **) {
 
   // Simulate until $finish
   while (VL_LIKELY(!contextp->gotFinish()) &&
-         VL_LIKELY(contextp->time() < 100)) {
+         VL_LIKELY(contextp->time() < 100) &&
+         VL_LIKELY(!(topp->eater_computer->flags.__PVT__halt))) {
     // Evaluate model
     topp->eval();
 
@@ -65,7 +68,7 @@ int main(int argc, char **argv, char **) {
 
     topp->clk_in = !topp->clk_in;
 
-    if (topp->eater_computer->PC_out == 4 &&
+    if (topp->eater_computer->PC_out == 6 &&
         topp->eater_computer->decoder__DOT__internal_state == 0x01)
       break;
   }
diff --git a/eater_cpu/cpp/simpc_term.cpp b/eater_cpu/cpp/simpc_term.cpp
index 540cc98..a2144b2 100644
--- a/eater_cpu/cpp/simpc_term.cpp
+++ b/eater_cpu/cpp/simpc_term.cpp
@@ -42,7 +42,7 @@ void simpc_ui_write(const std::unique_ptr<Veater_computer> &topp, uint64_t i) {
   // uint16_t opcode = topp->eater_computer->;
   uint8_t opcode = topp->eater_computer->INS->r_datastore;
   // topp->halt
-  uint8_t halt = 0;
+  uint8_t halt = topp->eater_computer->flags.__PVT__halt;
 
   PRINT_ME_W(status_top, 0, 0, "Step: %10lu", i);
   PRINT_ME_W(status_top, 1, 0, "%-20s", paused ? "Paused" : "Running");
@@ -100,7 +100,7 @@ void simpc_ui_finish_message(const std::unique_ptr<VerilatedContext> &contextp,
   PRINT_ME_W(status_top, 0, xpos, "Simulation finished.");
   const char *msg;
   // topp->halt
-  bool halt = false;
+  bool halt = topp->eater_computer->flags.__PVT__halt;
   if (halt) {
     msg = "Halt encountered.";
   } else if (!contextp->gotFinish()) {
-- 
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