Adding jobygps usart example.

examples/stm32f2/jobygps/usart_printf/Makefile

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+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program 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 General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = usart_printf
+
+include ../../Makefile.include
+

examples/stm32f2/jobygps/usart_printf/usart_printf.c

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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>,
+ *               2011 Piotr Esden-Tempski <piotr@esden.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/f2/gpio.h>
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/stm32/nvic.h>
+#include <libopencm3/stm32/f2/rcc.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+void clock_setup(void)
+{
+	//rcc_clock_setup_in_hse_8mhz_out_72mhz();
+
+	/* Enable GPIOA clock (for LED GPIOs). */
+	//rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
+
+	/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
+	//rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN |
+//				RCC_APB2ENR_AFIOEN |
+//				RCC_APB2ENR_USART1EN);
+  RCC_APB2ENR |= RCC_APB2ENR_USART1EN;
+	RCC_AHB1ENR |= RCC_AHB1ENR_GPIOCEN | RCC_AHB1ENR_GPIOAEN;
+}
+
+void usart_setup(void)
+{
+	//gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO9);
+	GPIO_MODER(GPIOA) |= GPIO_MODE(9, GPIO_MODE_AF);
+	gpio_set_af(GPIOA, GPIO_AF7, GPIO9|GPIO10);
+
+	/* Setup UART parameters. */
+	usart_set_baudrate(USART1, 9600, 16000000);
+	usart_set_databits(USART1, 8);
+	usart_set_stopbits(USART1, USART_STOPBITS_1);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+	usart_set_mode(USART1, USART_MODE_TX);
+
+	/* Finally enable the USART. */
+	usart_enable(USART1);
+}
+
+void gpio_setup(void)
+{
+	gpio_set(GPIOC, GPIO3);
+
+	/* Setup GPIO6 and 7 (in GPIO port A) for led use. */
+	gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT,
+		      GPIO_MODE_OUTPUT, GPIO3);
+}
+
+int _write (int file, char *ptr, int len)
+{
+        int i;
+
+	if (file == 1) {
+		for (i = 0; i < len; i++){
+			usart_send_blocking(USART1, ptr[i]);
+		}
+
+		return i;
+	}
+
+        errno = EIO;
+        return -1;
+}
+
+int main(void)
+{
+	int counter = 0;
+	float fcounter = 0.0;
+	double dcounter = 0.0;
+
+	clock_setup();
+	gpio_setup();
+	usart_setup();
+
+	/*
+	 * Write Hello World an integer, float and double all over
+	 * again while incrementing the numbers.
+	 */
+	while (1) {
+		gpio_toggle(GPIOC, GPIO3);
+		printf("Hello World! %i %f %f\r\n", counter, fcounter, dcounter);
+		counter++;
+		fcounter+=0.01;
+		dcounter+=0.01;
+	}
+
+	return 0;
+}

examples/stm32f2/jobygps/usart_printf/usart_printf.ld

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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for Open-BLDC (STM32F103CBT6, 128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+