Implemented a uart example that is using irq for receive and transmit.
This commit is contained in:
Piotr Esden-Tempski
parent
e5941fb075
commit
66fd5373b4
24
examples/obldc/usart_irq/Makefile
Normal file
24
examples/obldc/usart_irq/Makefile
Normal file
@ -0,0 +1,24 @@
|
|||||||
|
##
|
||||||
|
## This file is part of the libopenstm32 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
|
||||||
|
|
||||||
|
OOCD_BOARD = open-bldc
|
||||||
|
|
||||||
|
include ../../Makefile.include
|
||||||
126
examples/obldc/usart_irq/usart_irq.c
Normal file
126
examples/obldc/usart_irq/usart_irq.c
Normal file
@ -0,0 +1,126 @@
|
|||||||
|
/*
|
||||||
|
* This file is part of the libopenstm32 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 <libopenstm32/rcc.h>
|
||||||
|
#include <libopenstm32/gpio.h>
|
||||||
|
#include <libopenstm32/usart.h>
|
||||||
|
#include <libopenstm32/nvic.h>
|
||||||
|
|
||||||
|
void clock_setup(void)
|
||||||
|
{
|
||||||
|
rcc_clock_setup_in_hse_8mhz_out_72mhz();
|
||||||
|
|
||||||
|
/* Enable GPIOA clock. For LED gpio's */
|
||||||
|
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
|
||||||
|
|
||||||
|
/* Enable clocks for GPIO port B (for GPIO_USART1_TX) 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)
|
||||||
|
{
|
||||||
|
|
||||||
|
/* Enable the USART1 interrupt. */
|
||||||
|
nvic_enable_irq(NVIC_USART1_IRQ);
|
||||||
|
|
||||||
|
/* enable USART1 pin software remapping */
|
||||||
|
AFIO_MAPR |= AFIO_MAPR_USART1_REMAP;
|
||||||
|
|
||||||
|
/* Setup GPIO pin GPIO_USART1_RE_TX 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 GPIO pin GPIO_USART1_RE_RX on GPIO port B for receive. */
|
||||||
|
gpio_set_mode(GPIOB, GPIO_MODE_INPUT,
|
||||||
|
GPIO_CNF_INPUT_FLOAT, GPIO_USART1_RE_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(GPIOA, GPIO6 | GPIO7);
|
||||||
|
|
||||||
|
/* Setup GPIO6 and 7 (in GPIO port A) for led use. */
|
||||||
|
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
|
||||||
|
GPIO_CNF_OUTPUT_PUSHPULL,
|
||||||
|
GPIO6 | GPIO7);
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
void usart1_isr(void)
|
||||||
|
{
|
||||||
|
static u8 data = 'A';
|
||||||
|
|
||||||
|
/* Check if we were called because of RXNE. */
|
||||||
|
if ((USART_SR(USART1) & USART_SR_RXNE) != 0) {
|
||||||
|
|
||||||
|
/* Indicate that we got data. */
|
||||||
|
gpio_toggle(GPIOA, GPIO6);
|
||||||
|
|
||||||
|
/* 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_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;
|
||||||
|
}
|
||||||
31
examples/obldc/usart_irq/usart_irq.ld
Normal file
31
examples/obldc/usart_irq/usart_irq.ld
Normal file
@ -0,0 +1,31 @@
|
|||||||
|
/*
|
||||||
|
* This file is part of the libopenstm32 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 from libopenstm32. */
|
||||||
|
INCLUDE libopenstm32.ld
|
||||||
|
|
||||||
Loading…
x
Reference in New Issue
Block a user