From 320d61551b96874b0abd6721308a338994199d5b Mon Sep 17 00:00:00 2001
From: folkert van heusden <mail@vanheusden.com>
Date: Tue, 15 Mar 2022 22:37:23 +0100
Subject: [PATCH] ESP32 tweaks

---
 ESP32/main.ino       | 23 ++++++++++++++++++-----
 ESP32/platformio.ini |  4 ++--
 tty.cpp              |  6 ++++++
 3 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/ESP32/main.ino b/ESP32/main.ino
index 4171b97..40d011d 100644
--- a/ESP32/main.ino
+++ b/ESP32/main.ino
@@ -214,6 +214,8 @@ uint16_t loadbin(bus *const b)
 
 uint16_t exec_addr = 0;
 
+uint32_t start_ts = 0;
+
 void setup() {
 	Serial.begin(115200);
 
@@ -240,6 +242,8 @@ void setup() {
 	exec_addr = loadbin(b);
 	c->setRegister(7, exec_addr);
 
+	pinMode(LED_BUILTIN, OUTPUT);
+
 	Serial.println(F("Press <enter> to start"));
 
 	for(;;) {
@@ -253,27 +257,36 @@ void setup() {
 	}
 
 	Serial.println(F("Emulation starting!"));
+
+	start_ts = millis();
 }
 
-unsigned int icount = 0;
+uint32_t icount = 0;
 
 void loop() {
 	icount++;
 
-	if (icount % 1000 == 0 && Serial.available()) {
-		char c = Serial.read();
+	if ((icount & 1023) == 0) {
+		if (Serial.available()) {
+			char c = Serial.read();
 
-		if (c > 0 && c < 127)
-			tty_->sendChar(c);
+			if (c > 0 && c < 127)
+				tty_->sendChar(c);
+		}
 	}
 
 	if (c->step()) {
 		Serial.println(F(""));
 		Serial.println(F(" *** EMULATION STOPPED *** "));
+		Serial.print(F("Instructions per second: "));
+		Serial.println(icount * 1000.0 / (millis() - start_ts));
 		delay(1000);
 		Serial.println(F(" *** EMULATION RESTARTING *** "));
 
 		c->setRegister(7, exec_addr);
 		c->resetHalt();
+
+		start_ts = millis();
+		icount = 0;
 	}
 }
diff --git a/ESP32/platformio.ini b/ESP32/platformio.ini
index abb19e7..a08cf94 100644
--- a/ESP32/platformio.ini
+++ b/ESP32/platformio.ini
@@ -30,8 +30,8 @@ framework = arduino
 monitor_speed = 115200
 upload_speed = 1000000
 lib_deps = 
-build_flags = -std=c++17
-build_unflags = -std=gnu++11
+build_flags = -std=c++17 -Ofast
+build_unflags = -std=gnu++11 -Os
 
 [env:serial32_debug]
 platform = espressif32
diff --git a/tty.cpp b/tty.cpp
index db6d583..c134a5c 100644
--- a/tty.cpp
+++ b/tty.cpp
@@ -52,6 +52,12 @@ uint16_t tty::readWord(const uint16_t addr)
 
 	if (addr == PDP11TTY_TKS) {
 		vtemp = c ? 128 : 0;
+
+#if defined(ESP32)
+		static bool led_state = true;
+		digitalWrite(LED_BUILTIN, led_state);
+		led_state = !led_state;
+#endif
 	}
 	else if (addr == PDP11TTY_TKB) {
 		vtemp = c | (parity(c) << 7);