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Added usart_irq test for stm32-h103 board.

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This commit is contained in:
Piotr Esden-Tempski 2011-02-17 18:35:51 -08:00
parent 310561ac50
commit d1baf00629
3 changed files with 173 additions and 0 deletions
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23
examples/stm32/stm32-h103/usart_irq/Makefile Normal file
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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_irq
include ../../Makefile.include

119
examples/stm32/stm32-h103/usart_irq/usart_irq.c Normal file
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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/>.
*/
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/usart.h>
#include <libopencm3/stm32/nvic.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);
}
void usart_setup(void)
{
/* Enable the USART1 interrupt. */
nvic_enable_irq(NVIC_USART1_IRQ);
/* Setup GPIO pin GPIO_USART1_RE_TX on GPIO port B for transmit. */
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
/* Setup GPIO pin GPIO_USART1_RE_RX on GPIO port B for receive. */
gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
GPIO_CNF_INPUT_FLOAT, GPIO_USART1_RX);
/* Setup UART parameters. */
usart_set_baudrate(USART1, 230400);
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_RX);
/* Enable USART1 Receive interrupt. */
USART_CR1(USART1) |= USART_CR1_RXNEIE;
/* Finally enable the USART. */
usart_enable(USART1);
}
void gpio_setup(void)
{
gpio_set(GPIOC, GPIO12);
/* Setup GPIO6 and 7 (in GPIO port A) for led use. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
}
void usart1_isr(void)
{
static u8 data = 'A';
/* Check if we were called because of RXNE. */
if (((USART_CR1(USART1) & USART_CR1_RXNEIE) != 0) &&
((USART_SR(USART1) & USART_SR_RXNE) != 0)) {
/* Indicate that we got data. */
gpio_toggle(GPIOC, GPIO12);
/* Retrieve the data from the peripheral. */
data = usart_recv(USART1);
/* Enable transmit interrupt so it sends back the data. */
USART_CR1(USART1) |= USART_CR1_TXEIE;
}
/* Check if we were called because of TXE. */
if (((USART_CR1(USART1) & USART_CR1_TXEIE) != 0) &&
((USART_SR(USART1) & USART_SR_TXE) != 0)) {
/* Indicate that we are sending out data. */
//gpio_toggle(GPIOA, GPIO7);
/* Put data into the transmit register. */
usart_send(USART1, data);
/* Disable the TXE interrupt as we don't need it anymore. */
USART_CR1(USART1) &= ~USART_CR1_TXEIE;
}
}
int main(void)
{
clock_setup();
gpio_setup();
usart_setup();
/* Wait forever and do nothing. */
while (1)
__asm__("nop");
return 0;
}

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examples/stm32/stm32-h103/usart_irq/usart_irq.ld Normal file
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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