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authorPiotr Esden-Tempski2012-11-12 14:11:10 -0800
committerPiotr Esden-Tempski2012-11-12 14:11:10 -0800
commit956b1dbce4084e4787189e5f812b90e891ef9b7e (patch)
tree6e8da04c28d5f903d5e5de53dae62768ca7026e7
parent4691568ca476177dc338e8c62872ceca6b4b4999 (diff)
[examples] Added usart example for obldc strip.
-rw-r--r--examples/stm32/f1/obldc-strip/usart/Makefile25
-rw-r--r--examples/stm32/f1/obldc-strip/usart/usart.c87
2 files changed, 112 insertions, 0 deletions
diff --git a/examples/stm32/f1/obldc-strip/usart/Makefile b/examples/stm32/f1/obldc-strip/usart/Makefile
new file mode 100644
index 0000000..40dec09
--- /dev/null
+++ b/examples/stm32/f1/obldc-strip/usart/Makefile
@@ -0,0 +1,25 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## 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 = usart
+
+LDSCRIPT = ../obldc-strip.ld
+
+include ../../Makefile.include
+
diff --git a/examples/stm32/f1/obldc-strip/usart/usart.c b/examples/stm32/f1/obldc-strip/usart/usart.c
new file mode 100644
index 0000000..56940e2
--- /dev/null
+++ b/examples/stm32/f1/obldc-strip/usart/usart.c
@@ -0,0 +1,87 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Piotr Esden-Tempski <piotr@esden.net>
+ *
+ * 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 <libopencm3/stm32/f1/rcc.h>
+#include <libopencm3/stm32/f1/gpio.h>
+#include <libopencm3/stm32/usart.h>
+
+void clock_setup(void)
+{
+ rcc_clock_setup_in_hsi_out_64mhz();
+
+ /* Enable clocks for GPIO port B (for GPIO_USART1_TX and LED) and USART1. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
+}
+
+void usart_setup(void)
+{
+ /* Setup GPIO6 (in GPIO port A) to 'output push-pull' for LED use. */
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO5);
+
+ AFIO_MAPR |= AFIO_MAPR_USART1_REMAP;
+
+ /* Setup GPIO pin GPIO_USART3_TX/GPIO10 on GPIO port B for transmit. */
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_RE_TX);
+
+ /* Setup UART parameters. */
+ usart_set_baudrate(USART1, 230400);
+ usart_set_databits(USART1, 8);
+ usart_set_stopbits(USART1, USART_STOPBITS_1);
+ usart_set_mode(USART1, USART_MODE_TX);
+ usart_set_parity(USART1, USART_PARITY_NONE);
+ usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+ /* Finally enable the USART. */
+ usart_enable(USART1);
+}
+
+void gpio_setup(void)
+{
+ /* Set GPIO5 (in GPIO port B) to 'output push-pull'. */
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO5);
+}
+
+int main(void)
+{
+ int i, j = 0, c = 0;
+
+ clock_setup();
+ gpio_setup();
+ usart_setup();
+
+ /* Blink the LED (PA6) on the board with every transmitted byte. */
+ while (1) {
+ gpio_toggle(GPIOB, GPIO5); /* LED red on/off */
+ usart_send_blocking(USART1, c + '0'); /* Send a byte. */
+ c = (c == 9) ? 0 : c + 1; /* Increment c. */
+ if ((j++ % 80) == 0) { /* Newline after line full. */
+ usart_send_blocking(USART1, '\r');
+ usart_send_blocking(USART1, '\n');
+ }
+ for (i = 0; i < 800000; i++) /* Wait a bit. */
+ __asm__("nop");
+ }
+
+ return 0;
+}