serial_framing - See when a UART looses framing based on baudrate …

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See when a UART looses framing based on baudrate shmoo

main.cpp@0:839d381fd33b, 2010-10-14 (annotated)

User	Revision	Line number	New contents of line
simon	0:839d381fd33b	1	// See when the rx UART looses framing based on baudrate shmoo, sford
simon	0:839d381fd33b	2	// connect p13 to p10
simon	0:839d381fd33b	3
simon	0:839d381fd33b	4	#include "mbed.h"
simon	0:839d381fd33b	5
simon	0:839d381fd33b	6	Serial device(p13, NC);
simon	0:839d381fd33b	7	Serial m(NC, p10);
simon	0:839d381fd33b	8
simon	0:839d381fd33b	9	int main() {
simon	0:839d381fd33b	10	m.baud(4800);
simon	0:839d381fd33b	11	m.format(8, Serial::Even, 1);
simon	0:839d381fd33b	12	device.format(8, Serial::Even, 1);
simon	0:839d381fd33b	13
simon	0:839d381fd33b	14	for(int baud_rate=4800; baud_rate>=4000; baud_rate -= 25) {
simon	0:839d381fd33b	15	device.baud(baud_rate);
simon	0:839d381fd33b	16	device.printf("Hello world! How are you today! Hello world! How are you today!\n");
simon	0:839d381fd33b	17
simon	0:839d381fd33b	18	wait(0.05);
simon	0:839d381fd33b	19
simon	0:839d381fd33b	20	int frame_error = (LPC_UART3->LSR >> 3) & 1;
simon	0:839d381fd33b	21	m.getc();
simon	0:839d381fd33b	22
simon	0:839d381fd33b	23	printf("baud_rate: %d, frame_error: %d\n", baud_rate, frame_error);
simon	0:839d381fd33b	24	}
simon	0:839d381fd33b	25	}