usb_serial_as_stdio.h

00001 /*
00002  * mbed Application program
00003  *      Redirect Standard Input/Output
00004  *
00005  * Copyright (c) 2021 Kenji Arai / JH1PJL
00006  *  http://www7b.biglobe.ne.jp/~kenjia/
00007  *  https://os.mbed.com/users/kenjiArai/
00008  *      Created:    January   13th, 2021
00009  *      Revised:    February  28th, 2021
00010  */
00011 
00012 //  Include --------------------------------------------------------------------
00013 //#include    "mbed.h"
00014 #include    "USBSerial.h"
00015 
00016 //  Definition -----------------------------------------------------------------
00017 
00018 //  Constructor ----------------------------------------------------------------
00019 USBSerial *usb = NULL;
00020 
00021 //  RAM ------------------------------------------------------------------------
00022 
00023 //  ROM / Constant data --------------------------------------------------------
00024 
00025 //  Function prototypes --------------------------------------------------------
00026 
00027 //------------------------------------------------------------------------------
00028 //  Control Program
00029 //------------------------------------------------------------------------------
00030 /*
00031     https://cpplover.blogspot.com/2010/03/variadic-templates.html
00032  */
00033 template <typename ... Args>
00034 void print_usb(const char *format, Args const & ... args)
00035 {
00036     if (usb == NULL) {
00037         return;
00038     } else {
00039         if (usb->connected() == true) {
00040             usb->printf(format, args ...);
00041         }
00042     }
00043 }
00044 
00045 void usb_serial_initialize(void)
00046 {
00047     usb = new USBSerial;
00048 }
00049 
00050 uint8_t readable()
00051 {
00052     return usb->readable();
00053 }
00054 
00055 void putc(uint8_t c)
00056 {
00057     if (usb == NULL) {
00058         return;
00059     } else {
00060         usb->putc(c);
00061     }
00062 }
00063 
00064 uint8_t getc()
00065 {
00066     if (usb == NULL) {
00067         while(true){ ;} // infinit loop
00068     } else {
00069         return usb->getc();
00070     }
00071 }