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authorPiotr Esden-Tempski2012-03-11 23:12:26 -0700
committerPiotr Esden-Tempski2012-03-11 23:12:26 -0700
commit7e9425bdacc5169600c09b7f17c27dbea36ec402 (patch)
tree3b9e577bf8c71e377baec15e09848bf68601492d /examples
parent7907b29113b9308d81dafd35c2804a21bf713242 (diff)
Added usart example to lisa/m 2.0
Diffstat (limited to 'examples')
-rw-r--r--examples/stm32/f1/lisa-m-2/usart/Makefile25
-rw-r--r--examples/stm32/f1/lisa-m-2/usart/README12
-rw-r--r--examples/stm32/f1/lisa-m-2/usart/usart.c86
3 files changed, 123 insertions, 0 deletions
diff --git a/examples/stm32/f1/lisa-m-2/usart/Makefile b/examples/stm32/f1/lisa-m-2/usart/Makefile
new file mode 100644
index 0000000..4ba7e9e
--- /dev/null
+++ b/examples/stm32/f1/lisa-m-2/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 = ../lisa-m.ld
+
+include ../../Makefile.include
+
diff --git a/examples/stm32/f1/lisa-m-2/usart/README b/examples/stm32/f1/lisa-m-2/usart/README
new file mode 100644
index 0000000..5a3f316
--- /dev/null
+++ b/examples/stm32/f1/lisa-m-2/usart/README
@@ -0,0 +1,12 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example program sends some characters on USART2 on Lisa/M 2.0 board
+(see http://paparazzi.enac.fr/wiki/LisaM for details).
+
+The terminal settings for the receiving device/PC are 38400 8n1.
+
+The sending is done in a blocking way in the code, see the usart_irq example
+for a more elaborate USART example.
+
diff --git a/examples/stm32/f1/lisa-m-2/usart/usart.c b/examples/stm32/f1/lisa-m-2/usart/usart.c
new file mode 100644
index 0000000..4422b55
--- /dev/null
+++ b/examples/stm32/f1/lisa-m-2/usart/usart.c
@@ -0,0 +1,86 @@
+/*
+ * 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/>.
+ */
+
+#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_hse_12mhz_out_72mhz();
+
+ /* Enable GPIOA, GPIOB, GPIOC clock. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR,
+ RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN |
+ RCC_APB2ENR_IOPCEN);
+
+ /* Enable clocks for GPIO port B (for GPIO_USART3_TX) and USART3. */
+ rcc_peripheral_enable_clock(&RCC_APB1ENR,
+ RCC_APB1ENR_USART2EN);
+}
+
+void usart_setup(void)
+{
+ /* Setup GPIO pin GPIO_USART2_TX. */
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
+
+ /* Setup UART parameters. */
+ usart_set_baudrate(USART2, 38400);
+ usart_set_databits(USART2, 8);
+ usart_set_stopbits(USART2, USART_STOPBITS_1);
+ usart_set_mode(USART2, USART_MODE_TX);
+ usart_set_parity(USART2, USART_PARITY_NONE);
+ usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
+
+ /* Finally enable the USART. */
+ usart_enable(USART2);
+
+}
+
+void gpio_setup(void)
+{
+ /* Set GPIO8 (in GPIO port A) to 'output push-pull'. */
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
+}
+
+int main(void)
+{
+ int i, j = 0, c = 0;
+
+ clock_setup();
+ gpio_setup();
+ usart_setup();
+
+ /* Blink the LED (PA8) on the board with every transmitted byte. */
+ while (1) {
+ gpio_toggle(GPIOA, GPIO8); /* LED on/off */
+ usart_send_blocking(USART2, c + '0'); /* USART2: Send byte. */
+ c = (c == 9) ? 0 : c + 1; /* Increment c. */
+ if ((j++ % 80) == 0) { /* Newline after line full. */
+ usart_send_blocking(USART2, '\r');
+ usart_send_blocking(USART2, '\n');
+ }
+ for (i = 0; i < 800000; i++) /* Wait a bit. */
+ __asm__("nop");
+ }
+
+ return 0;
+}