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vf6xx: add UART example

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The UART's baud rate is calculated using the current clock
configuration from the clock module. This example makes use
of the standard C library and writes the characters to the
UART in blocking mode.
This commit is contained in:
Stefan Agner
2014-07-09 23:57:02 +02:00
committed by Karl Palsson
parent 849bdc8001
commit 0b9e7d0d5d
5 changed files with 170 additions and 0 deletions
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26
examples/vf6xx/colibri-vf61/uart/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
## Copyright (C) 2014 Stefan Agner <stefan@agner.ch>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = uart
LDSCRIPT = ../colibri-vf61.ld
include ../Makefile.include

73
examples/vf6xx/colibri-vf61/uart/uart.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2014 Stefan Agner <stefan@agner.ch>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <errno.h>
#include <libopencm3/cm3/common.h>
#include <libopencm3/vf6xx/ccm.h>
#include <libopencm3/vf6xx/uart.h>
int _write(int file, char *ptr, int len);
int _write(int file, char *ptr, int len)
{
int i;
if (file == 1) {
for (i = 0; i < len; i++)
uart_send_blocking(UART2, ptr[i]);
return i;
}
errno = EIO;
return -1;
}
static void uart_init(void)
{
ccm_clock_gate_enable(CG9_UART2);
uart_enable(UART2);
uart_set_baudrate(UART2, 115200);
}
int main(void)
{
int counter = 0;
float fcounter = 0.0;
double dcounter = 0.0;
ccm_calculate_clocks();
uart_init();
/*
* Write Hello World an integer, float and double all over
* again while incrementing the numbers.
*/
while (1) {
printf("Hello World! %i %f %f\r\n", counter, fcounter,
dcounter);
counter++;
fcounter += 0.01;
dcounter += 0.01;
}
return 0;
}