0b9e7d0d5d
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.
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2014 Stefan Agner <stefan@agner.ch>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <libopencm3/cm3/common.h>
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#include <libopencm3/vf6xx/ccm.h>
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#include <libopencm3/vf6xx/uart.h>
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int _write(int file, char *ptr, int len);
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int _write(int file, char *ptr, int len)
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{
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int i;
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if (file == 1) {
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for (i = 0; i < len; i++)
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uart_send_blocking(UART2, ptr[i]);
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return i;
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}
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errno = EIO;
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return -1;
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}
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static void uart_init(void)
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{
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ccm_clock_gate_enable(CG9_UART2);
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uart_enable(UART2);
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uart_set_baudrate(UART2, 115200);
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}
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int main(void)
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{
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int counter = 0;
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float fcounter = 0.0;
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double dcounter = 0.0;
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ccm_calculate_clocks();
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uart_init();
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/*
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* Write Hello World an integer, float and double all over
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* again while incrementing the numbers.
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*/
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while (1) {
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printf("Hello World! %i %f %f\r\n", counter, fcounter,
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dcounter);
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counter++;
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fcounter += 0.01;
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dcounter += 0.01;
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}
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return 0;
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}
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