Added missing operator bool to USBSerial. Note. Its odd that I'd not spotted this was missing as I added it to HardwareSerial ages ago
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@ -49,6 +49,8 @@ public:
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void begin(unsigned long, uint8_t);
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void end(void);
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operator bool() { return true; } // Roger Clark. This is needed because in cardinfo.ino it does if (!Serial) . It seems to be a work around for the Leonardo that we needed to implement just to be compliant with the API
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virtual int available(void);// Changed to virtual
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uint32 read(void *buf, uint32 len);
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