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vf6xx: add UART example
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.
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‎Makefile‎

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@@ -24,6 +24,7 @@ TARGETS := stm32/f0 stm32/f1 stm32/f2 stm32/f3 stm32/f4 stm32/l0 stm32/l1
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TARGETS += lpc/lpc13xx lpc/lpc17xx #lpc/lpc43xx
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TARGETS += tiva/lm3s tiva/lm4f
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TARGETS += efm32/efm32tg efm32/efm32g efm32/efm32lg efm32/efm32gg
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TARGETS += vf6xx
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# Be silent per default, but 'make V=1' will show all compiler calls.
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ifneq ($(V),1)

‎examples/vf6xx/colibri-vf61/Makefile.include‎

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##
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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 <[email protected]>
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## Copyright (C) 2010 Piotr Esden-Tempski <[email protected]>
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## Copyright (C) 2011 Fergus Noble <[email protected]>
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## Copyright (C) 2014 Stefan Agner <[email protected]>
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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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LIBNAME = opencm3_vf6xx
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DEFS = -DVF6XX
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FP_FLAGS ?= -mfloat-abi=hard -mfpu=fpv4-sp-d16
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ARCH_FLAGS = -mthumb -mcpu=cortex-m4 $(FP_FLAGS)
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include ../../../Makefile.rules
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‎examples/vf6xx/colibri-vf61/colibri-vf61.ld‎

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/*
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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 <[email protected]>
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* Copyright (C) 2014 Stefan Agner <[email protected]>
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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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/* Linker script for Colibri VF61 (Vybrid VF610, use sysRAM0, 512KiB). */
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/* Define memory regions. */
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MEMORY
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{
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/*
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* Note: 0x1f000000 is an alias for code bus to the same memory
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* located at 0x3f000000, hence start with the data section
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* at an offset of 256KiB. One can define this section lenghts
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* freely
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*/
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pc_ram (rwx) : ORIGIN = 0x1f000000, LENGTH = 256K
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ps_ram (rwx) : ORIGIN = 0x3f040000, LENGTH = 256K
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}
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/* Include the common ld script. */
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INCLUDE libopencm3_vf6xx.ld
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‎examples/vf6xx/colibri-vf61/uart/Makefile‎

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##
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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 <[email protected]>
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## Copyright (C) 2014 Stefan Agner <[email protected]>
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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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BINARY = uart
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LDSCRIPT = ../colibri-vf61.ld
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include ../Makefile.include
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‎examples/vf6xx/colibri-vf61/uart/uart.c‎

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/*
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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 <[email protected]>
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* Copyright (C) 2014 Stefan Agner <[email protected]>
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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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