change speed in serial filer

serial_filer.cpp

@@ -6,12 +6,22 @@
 #include "serial_filer.h"
 
 bool serial_filer::start(const char *) {
-#if defined(TERM_SPEED)
-	Serial.begin(TERM_SPEED);
 	return true;
-#else
-	return false;
-#endif
+}
+
+const unsigned speeds[] = {
+	115200, 57600, 19200, 9600, 4800, 2400
+};
+static unsigned currsp;
+
+const char *serial_filer::advance() {
+	static char buf[16];
+	unsigned s = speeds[currsp];
+	Serial.begin(s);
+	currsp++;
+	if (currsp == sizeof(speeds)/sizeof(speeds[0]))
+		currsp = 0;
+	return itoa(s, buf, 10);
 }
 
 void serial_filer::write(uint8_t b) {

serial_filer.h

@@ -1,9 +1,11 @@
 #ifndef __SERIAL_FILER_H__
 #define __SERIAL_FILER_H__
 
+// see https://playground.arduino.cc/Interfacing/LinuxTTY
+// FIXME: do this in minicom config file
 class serial_filer: public filer {
 public:
-	const char *advance() { return "serial"; }
+	const char *advance();
 	const char *rewind() { return advance(); }
 
 	const char *checkpoint();