emulation on host: Add full UART driver emulation.

tests/host/Makefile

@@ -65,6 +65,7 @@ CORE_CPP_FILES := $(addprefix $(CORE_PATH)/,\
 	libb64/cencode.cpp \
 	libb64/cdecode.cpp \
 	Schedule.cpp \
+	HardwareSerial.cpp \
 )
 
 CORE_C_FILES := $(addprefix $(CORE_PATH)/,\
@@ -74,7 +75,7 @@ MOCK_CPP_FILES_COMMON := $(addprefix common/,\
 	Arduino.cpp \
 	spiffs_mock.cpp \
 	WMath.cpp \
-	MockSerial.cpp \
+	MockUART.cpp \
 	MockTools.cpp \
 	MocklwIP.cpp \
 )
@@ -95,7 +96,6 @@ MOCK_C_FILES := $(addprefix common/,\
 	noniso.c \
 )
 
-
 INC_PATHS += $(addprefix -I, \
 	. \
 	common \
@@ -231,7 +231,7 @@ ARDUINO_LIBS := \
 		WiFiServerSecureBearSSL.cpp \
 		BearSSLHelpers.cpp \
 		CertStoreBearSSL.cpp \
-	) \
+	)
 
 OPT_ARDUINO_LIBS ?= $(addprefix ../../libraries/,\
 	$(addprefix ESP8266WebServer/src/,\
@@ -251,7 +251,7 @@ OPT_ARDUINO_LIBS ?= $(addprefix ../../libraries/,\
 	DNSServer/src/DNSServer.cpp \
 	ESP8266AVRISP/src/ESP8266AVRISP.cpp \
 	ESP8266HTTPClient/src/ESP8266HTTPClient.cpp \
-) \
+)
 
 MOCK_ARDUINO_LIBS := $(addprefix common/,\
 	ClientContextSocket.cpp \
@@ -263,7 +263,7 @@ MOCK_ARDUINO_LIBS := $(addprefix common/,\
 	MockEsp.cpp \
 	MockEEPROM.cpp \
 	MockSPI.cpp \
-) \
+)
 
 CPP_SOURCES_CORE_EMU = \
 	$(MOCK_CPP_FILES_EMU) \

tests/host/README.txt

@@ -19,6 +19,13 @@ WiFiClient+WiFiServer/ClientContext and WifiUdp/UdpContext using socket
 posix API.  Further work will optionally propose native lwIP library
 instead.
 
+Serial UART0 and UART1 are emulated via stdin/stdout/stderr.  Therefor
+stdin is connected to UART0(RX) and stdout is connected to UART0(TX).
+UART1(TX) writes to stderr.  Reading from stdin happens in non-blocking
+raw mode, that means each character is directly injected into the UART
+FIFO without any buffering in the console.  The command line switch -c
+can be used to stop the emulation from intersepting CTRL-C (SIGINT).
+
 How to compile and run a sketch
 -------------------------------
 
@@ -73,7 +80,10 @@ Options are available:
 	-h
 	-i eth0		bind servers to this interface (WIP)
 	-l		bind Multicast to the above interface (WIP)
-	-f              no throttle (possibly 100%CPU)
+	-c		ignore CTRL-C (send it over serial device)
+	-f		no throttle (possibly 100%CPU)
+	-S		spiffs size in KBytes (default: 1024)
+			(negative value will force mismatched size)
 
 TODO
 ----

tests/host/common/Arduino.cpp

@@ -37,6 +37,11 @@ extern "C" void yield()
 {
 }
 
+extern "C" void optimistic_yield (uint32_t interval_us)
+{
+    usleep(interval_us);
+}
+
 extern "C" void esp_yield()
 {
 }

tests/host/common/Arduino.h

@@ -191,8 +191,6 @@ extern "C" {
     void init(void);
     void initVariant(void);
 
-    int atexit(void (*func)()) __attribute__((weak));
-
     void pinMode(uint8_t pin, uint8_t mode);
     void digitalWrite(uint8_t pin, uint8_t val);
     int digitalRead(uint8_t pin);

tests/host/common/ArduinoMain.cpp

@@ -33,12 +33,58 @@
 #include <user_interface.h> // wifi_get_ip_info()
 
 #include <signal.h>
-#include <unistd.h> // usleep
+#include <unistd.h>
 #include <getopt.h>
+#include <termios.h>
+#include <stdarg.h>
+#include <stdio.h>
 
 bool user_exit = false;
 const char* host_interface = nullptr;
 size_t spiffs_kb = 1024;
+bool ignore_sigint = false;
+bool restore_tty = false;
+
+#define STDIN STDIN_FILENO
+
+static struct termios initial_settings;
+
+static int mock_start_uart(void)
+{
+	struct termios settings;
+
+	if (!isatty(STDIN)) return 0;
+	if (tcgetattr(STDIN, &initial_settings) < 0) return -1;
+	settings = initial_settings;
+	settings.c_lflag &= ~(ignore_sigint ? ISIG : 0);
+	settings.c_lflag &= ~(ECHO	| ICANON);
+	settings.c_iflag &= ~(ICRNL | INLCR | ISTRIP | IXON);
+	settings.c_oflag |=	(ONLCR);
+	settings.c_cc[VMIN]	= 0;
+	settings.c_cc[VTIME] = 0;
+	if (tcsetattr(STDIN, TCSANOW, &settings) < 0) return -2;
+	tty_restore = true;
+	return 0;
+}
+
+static int mock_stop_uart(void)
+{
+	if (!restore_tty) return 0;
+	if (!isatty(STDIN)) {
+		perror("isatty(STDIN)");
+		//system("stty sane"); <- same error message "Inappropriate ioctl for device"
+		return 0;
+	}
+	if (tcsetattr(STDIN, TCSANOW, &initial_settings) < 0) return -1;
+	printf("\e[?25h"); // show cursor
+	return (0);
+}
+
+static uint8_t mock_read_uart(void)
+{
+	uint8_t ch = 0;
+	return (read(STDIN, &ch, 1) == 1) ? ch : 0;
+}
 
 void help (const char* argv0, int exitcode)
 {
@@ -48,9 +94,10 @@ void help (const char* argv0, int exitcode)
 		"	-h\n"
 		"	-i <interface> - use this interface for IP address\n"
 		"	-l             - bind tcp/udp servers to interface only (not 0.0.0.0)\n"
+		"	-c             - ignore CTRL-C (send it via Serial)\n"
 		"	-f             - no throttle (possibly 100%%CPU)\n"
 		"	-S             - spiffs size in KBytes (default: %zd)\n"
-		"	                 (negative value will force mismatched size)\n"
+		"                  (negative value will force mismatched size)\n"
 		, argv0, spiffs_kb);
 	exit(exitcode);
 }
@@ -60,13 +107,15 @@ static struct option options[] =
 	{ "help",		no_argument,		NULL, 'h' },
 	{ "fast",		no_argument,		NULL, 'f' },
 	{ "local",		no_argument,		NULL, 'l' },
+	{ "sigint",		no_argument,		NULL, 'c' },
 	{ "interface",		required_argument,	NULL, 'i' },
 	{ "spiffskb",		required_argument,	NULL, 'S' },
 };
 
-void save ()
+void cleanup ()
 {
 	mock_stop_spiffs();
+	mock_stop_uart();
 }
 
 void control_c (int sig)
@@ -76,7 +125,7 @@ void control_c (int sig)
 	if (user_exit)
 	{
 		fprintf(stderr, MOCK "stuck, killing\n");
-		save();
+		cleanup();
 		exit(1);
 	}
 	user_exit = true;
@@ -90,7 +139,7 @@ int main (int argc, char* const argv [])
 
 	for (;;)
 	{
-		int n = getopt_long(argc, argv, "hlfi:S:", options, NULL);
+		int n = getopt_long(argc, argv, "hlcfi:S:", options, NULL);
 		if (n < 0)
 			break;
 		switch (n)
@@ -104,6 +153,9 @@ int main (int argc, char* const argv [])
 		case 'l':
 			global_ipv4_netfmt = NO_GLOBAL_BINDING;
 			break;
+		case 'c':
+			ignore_sigint = true;
+			break;
 		case 'f':
 			fast = true;
 			break;
@@ -128,16 +180,25 @@ int main (int argc, char* const argv [])
 	// setup global global_ipv4_netfmt
 	wifi_get_ip_info(0, nullptr);
 
+	// set stdin to non blocking mode
+	mock_start_uart();
+
+	// install exit handler in case Esp.restart() is called
+	atexit(cleanup);
+
 	setup();
 	while (!user_exit)
 	{
+		uint8_t data = mock_read_uart();
+
+		if (data)
+			uart_new_data(UART0, data);
 		if (!fast)
-			usleep(10000); // not 100% cpu
+			usleep(1000); // not 100% cpu, ~1000 loops per second
 		loop();
 		check_incoming_udp();
 	}
-
-	save();
+	cleanup();
 
 	return 0;
 }

tests/host/common/HostWiring.cpp

@@ -46,17 +46,23 @@ void pinMode (uint8_t pin, uint8_t mode)
 	case WAKEUP_PULLDOWN: m="WAKEUP_PULLDOWN"; break;
 	default: m="(special)";
 	}
+#ifdef DEBUG_ESP_CORE
 	fprintf(stderr, MOCK "gpio%d: mode='%s'\n", pin, m);
+#endif
 }
 
 void digitalWrite(uint8_t pin, uint8_t val)
 {
+#ifdef DEBUG_ESP_CORE
 	fprintf(stderr, MOCK "digitalWrite(pin=%d val=%d)\n", pin, val);
+#endif
 }
 
 void analogWrite(uint8_t pin, int val)
 {
+#ifdef DEBUG_ESP_CORE
 	fprintf(stderr, MOCK "analogWrite(pin=%d, val=%d\n", pin, val);
+#endif
 }
 
 int analogRead(uint8_t pin)
@@ -67,11 +73,17 @@ int analogRead(uint8_t pin)
 
 void analogWriteRange(uint32_t range)
 {
+#ifdef DEBUG_ESP_CORE
 	fprintf(stderr, MOCK "analogWriteRange(range=%d)\n", range);
+#endif
 }
 
 int digitalRead(uint8_t pin)
 {
+#ifdef DEBUG_ESP_CORE
 	fprintf(stderr, MOCK "digitalRead(%d)\n", pin);
-	return 0;
+#endif
+
+	// pin 0 is most likely a low active input
+	return pin ? 0 : 1;
 }