SerialInterruptFix - A temporary workaround for stdio hangs when using…

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A temporary workaround for stdio hangs when using both inside and outside an interrupt

main.cpp@0:51318bb188e2, 2010-02-20 (annotated)

User	Revision	Line number	New contents of line
simon	0:51318bb188e2	1	// using 2 serial instances to workaround hand bug while using printf both inside and outside interrupt
simon	0:51318bb188e2	2
simon	0:51318bb188e2	3	#include "mbed.h"
simon	0:51318bb188e2	4
simon	0:51318bb188e2	5	Serial pc(USBTX, USBRX); // tx, rx
simon	0:51318bb188e2	6	Serial pc2(USBTX, USBRX); // tx, rx
simon	0:51318bb188e2	7
simon	0:51318bb188e2	8	// debugging LEDs
simon	0:51318bb188e2	9	DigitalOut interrupt(LED1);
simon	0:51318bb188e2	10	DigitalOut tx(LED4);
simon	0:51318bb188e2	11
simon	0:51318bb188e2	12	void handle() {
simon	0:51318bb188e2	13	char rx_byte = pc2.getc();
simon	0:51318bb188e2	14	interrupt = !interrupt;
simon	0:51318bb188e2	15	}
simon	0:51318bb188e2	16
simon	0:51318bb188e2	17	int main() {
simon	0:51318bb188e2	18	pc2.attach(handle);
simon	0:51318bb188e2	19
simon	0:51318bb188e2	20	while (1) {
simon	0:51318bb188e2	21	// send a long string of bytes
simon	0:51318bb188e2	22	tx = 1;
simon	0:51318bb188e2	23	for (int i=0;i<20;i++) {
simon	0:51318bb188e2	24	printf("If I receive while transmitting this I will crash...\r\n");
simon	0:51318bb188e2	25	}
simon	0:51318bb188e2	26	tx = 0;
simon	0:51318bb188e2	27	wait(1.0);
simon	0:51318bb188e2	28	}
simon	0:51318bb188e2	29	}