Update to v068r01 release.

byuu says:

This adds RTS/CTS support to the serial communications emulation. Okay,
well the PC acts as if it is always ready, because it always is even on
the real thing, but the PC-waiting-for-SNES side works.

Source only, hardware communication only works on OS X and Linux
(Windows serial communication is totally different, I don't feel like
writing a Windows version), more documentation will come later.

bsnes/nall/function.hpp

@@ -1,7 +1,7 @@
 #ifndef NALL_FUNCTION_HPP
 #define NALL_FUNCTION_HPP
 
-#include <malloc.h>
+#include <stdlib.h>
 #include <functional>
 #include <type_traits>
 

bsnes/nall/serial.hpp

@@ -23,7 +23,7 @@ namespace nall {
       return ::write(port, (void*)data, length);
     }
 
-    bool open(const char *portname, unsigned rate) {
+    bool open(const char *portname, unsigned rate, bool flowcontrol) {
       close();
 
       port = ::open(portname, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
@@ -41,8 +41,13 @@ namespace nall {
       attr.c_iflag &=~ (BRKINT | PARMRK | INPCK | ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXOFF | IXANY);
       attr.c_iflag |=  (IGNBRK | IGNPAR);
       attr.c_oflag &=~ (OPOST);
-      attr.c_cflag &=~ (CSIZE | CSTOPB | PARENB);
+      attr.c_cflag &=~ (CSIZE | CSTOPB | PARENB | CLOCAL);
-      attr.c_cflag |=  (CS8 | CREAD | CLOCAL);
+      attr.c_cflag |=  (CS8 | CREAD);
+      if(flowcontrol == false) {
+        attr.c_cflag &= ~CRTSCTS;
+      } else {
+        attr.c_cflag |=  CRTSCTS;
+      }
       attr.c_cc[VTIME] = attr.c_cc[VMIN] = 0;
 
       if(tcsetattr(port, TCSANOW, &attr) == -1) { close(); return false; }

bsnes/snes/cartridge/cartridge.cpp

@@ -27,7 +27,6 @@ void Cartridge::load(Mode cartridge_mode, const lstring &xml_list) {
   supergameboy_version = SuperGameBoyVersion::Version1;
   supergameboy_ram_size = 0;
   supergameboy_rtc_size = 0;
-  serial_baud_rate = 57600;
 
   has_bsx_slot   = false;
   has_superfx    = false;

bsnes/snes/cartridge/cartridge.hpp

@@ -33,7 +33,6 @@ public:
   readonly<SuperGameBoyVersion> supergameboy_version;
   readonly<unsigned> supergameboy_ram_size;
   readonly<unsigned> supergameboy_rtc_size;
-  readonly<unsigned> serial_baud_rate;
 
   readonly<bool> has_bsx_slot;
   readonly<bool> has_superfx;

bsnes/snes/cartridge/xml.cpp

@@ -608,12 +608,6 @@ void Cartridge::xml_parse_msu1(xml_element &root) {
 
 void Cartridge::xml_parse_serial(xml_element &root) {
   has_serial = true;
-
-  foreach(attr, root.attribute) {
-    if(attr.name == "baud") {
-      serial_baud_rate = strunsigned(attr.content);
-    }
-  }
 }
 
 void Cartridge::xml_parse_address(Mapping &m, const string &data) {

bsnes/snes/chip/serial/serial.cpp

@@ -14,9 +14,11 @@ static void snesserial_write(uint8 data) { serial.write(data); }
 void Serial::Enter() { serial.enter(); }
 
 void Serial::enter() {
-  latch = 0;
+  data1 = 0;
+  data2 = 0;
   add_clocks(256 * 8);  //warm-up
-  if(snesserial_main) snesserial_main(snesserial_tick, snesserial_read, snesserial_write);
+  if(flowcontrol()) data2 = 1;
+  if(main) main(snesserial_tick, snesserial_read, snesserial_write);
   while(true) add_clocks(frequency);  //snesserial_main() fallback
 }
 
@@ -40,16 +42,19 @@ uint8 Serial::read() {
 }
 
 void Serial::write(uint8 data) {
-  latch = 1;
+  if(flowcontrol()) while(cpu.pio() & 0x80) add_clocks(1);
+  add_clocks(8);
+
+  data1 = 1;
   add_clocks(8);
 
   for(unsigned i = 0; i < 8; i++) {
-    latch = (data & 1) ^ 1;
+    data1 = (data & 1) ^ 1;
     data >>= 1;
     add_clocks(8);
   }
 
-  latch = 0;
+  data1 = 0;
   add_clocks(8);
 }
 
@@ -82,7 +87,9 @@ void Serial::enable() {
   string name = notdir(cartridge.basename());
   string path = dir(cartridge.basename());
   if(open(name, path)) {
-    snesserial_main = sym("snesserial_main");
+    baudrate = sym("snesserial_baudrate");
+    flowcontrol = sym("snesserial_flowcontrol");
+    main = sym("snesserial_main");
   }
 }
 
@@ -91,7 +98,7 @@ void Serial::power() {
 }
 
 void Serial::reset() {
-  create(Serial::Enter, cartridge.serial_baud_rate() * 8);
+  create(Serial::Enter, baudrate() * 8);
 }
 
 }

bsnes/snes/chip/serial/serial.hpp

@@ -8,7 +8,8 @@ public:
   void reset();
   void serialize(serializer&);
 
-  readonly<bool> latch;
+  readonly<bool> data1;
+  readonly<bool> data2;
 
   void add_clocks(unsigned clocks);
   uint8 read();
@@ -19,7 +20,9 @@ public:
 
 private:
   MMIO *r4016, *r4017;
-  function<void (void (*)(unsigned), uint8_t (*)(), void (*)(uint8_t))> snesserial_main;
+  function<unsigned ()> baudrate;
+  function<bool ()> flowcontrol;
+  function<void (void (*)(unsigned), uint8_t (*)(), void (*)(uint8_t))> main;
 };
 
 extern Serial serial;

bsnes/snes/chip/serial/serialization.cpp

@@ -2,7 +2,8 @@
 
 void Serial::serialize(serializer &s) {
   Processor::serialize(s);
-  s.integer((bool&)latch);
+  s.integer((bool&)data1);
+  s.integer((bool&)data2);
 }
 
 #endif

bsnes/snes/input/input.cpp

@@ -4,7 +4,7 @@ Input input;
 
 uint8 Input::port_read(bool portnumber) {
   if(cartridge.has_serial() && portnumber == 1) {
-    return serial.latch();
+    return (serial.data2() << 1) | (serial.data1() << 0);
   }
 
   port_t &p = port[portnumber];

bsnes/snes/snes.hpp

@@ -1,12 +1,12 @@
 namespace SNES {
   namespace Info {
     static const char Name[] = "bsnes";
-    static const char Version[] = "068";
+    static const char Version[] = "068.01";
     static const unsigned SerializerVersion = 12;
   }
 }
 
-//#define DEBUGGER
+#define DEBUGGER
 #define CHEAT_SYSTEM
 
 #include <libco/libco.h>