From 7e9425bdacc5169600c09b7f17c27dbea36ec402 Mon Sep 17 00:00:00 2001 From: Piotr Esden-Tempski Date: Sun, 11 Mar 2012 23:12:26 -0700 Subject: Added usart example to lisa/m 2.0 --- examples/stm32/f1/lisa-m-2/usart/Makefile | 25 +++++++++ examples/stm32/f1/lisa-m-2/usart/README | 12 +++++ examples/stm32/f1/lisa-m-2/usart/usart.c | 86 +++++++++++++++++++++++++++++++ 3 files changed, 123 insertions(+) create mode 100644 examples/stm32/f1/lisa-m-2/usart/Makefile create mode 100644 examples/stm32/f1/lisa-m-2/usart/README create mode 100644 examples/stm32/f1/lisa-m-2/usart/usart.c (limited to 'examples/stm32/f1/lisa-m-2/usart') 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 +## +## 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 . +## + +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 + * + * 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 . + */ + +#include +#include +#include + +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; +} -- cgit v1.2.3