100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/*
|
|
* This file is part of the libopencm3 project.
|
|
*
|
|
* Copyright (C) 2012-2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
/**
|
|
* \addtogroup Examples
|
|
*
|
|
*/
|
|
/*
|
|
* Pins handled by hw peripheral:
|
|
* Tx <-> PB1
|
|
* Rx <-> PB0
|
|
* Input pins handled manually via interrupts:
|
|
* DCD <-> PA2
|
|
* DSR <-> PA3
|
|
* RI <-> PA4
|
|
* CTS <-> PA5 (UNUSED)
|
|
* Output pins handled via commands from the host:
|
|
* DTR <-> PA6
|
|
* RTS <-> PA7
|
|
*/
|
|
|
|
#include "usb_to_serial_cdcacm.h"
|
|
|
|
#include <libopencm3/lm4f/rcc.h>
|
|
#include <libopencm3/lm4f/uart.h>
|
|
#include <libopencm3/lm4f/nvic.h>
|
|
|
|
static void uart_ctl_line_setup(void)
|
|
{
|
|
uint32_t inpins, outpins;
|
|
|
|
inpins = PIN_DCD | PIN_DSR | PIN_RI | PIN_CTS;
|
|
outpins = PIN_DTR | PIN_RTS;
|
|
|
|
gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, outpins);
|
|
gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, inpins);
|
|
}
|
|
|
|
void uart_init(void)
|
|
{
|
|
/* Enable GPIOA and GPIOB in run mode. */
|
|
periph_clock_enable(RCC_GPIOB);
|
|
periph_clock_enable(RCC_GPIOA);
|
|
uart_ctl_line_setup();
|
|
/* Mux PB0 and PB1 to AF1 (UART1 in this case) */
|
|
gpio_set_af(GPIOB, 1, GPIO0 | GPIO1);
|
|
|
|
/* Enable the UART clock */
|
|
periph_clock_enable(RCC_UART1);
|
|
/* Disable the UART while we mess with its setings */
|
|
uart_disable(UART1);
|
|
/* Configure the UART clock source */
|
|
uart_clock_from_piosc(UART1);
|
|
/* We don't make any other settings here. */
|
|
uart_enable(UART1);
|
|
|
|
/* Ping us when something comes in */
|
|
uart_enable_rx_interrupt(UART1);
|
|
nvic_enable_irq(NVIC_UART1_IRQ);
|
|
}
|
|
|
|
uint8_t uart_get_ctl_line_state(void)
|
|
{
|
|
return gpio_read(GPIOA, PIN_RI | PIN_DSR | PIN_DCD);
|
|
}
|
|
|
|
void uart_set_ctl_line_state(uint8_t dtr, uint8_t rts)
|
|
{
|
|
uint8_t val = 0;
|
|
|
|
val |= dtr ? PIN_DTR : 0;
|
|
val |= rts ? PIN_RTS : 0;
|
|
|
|
gpio_write(GPIOA, PIN_DTR | PIN_RTS, val);
|
|
}
|
|
|
|
void uart1_isr(void)
|
|
{
|
|
uint8_t rx;
|
|
rx = uart_recv(UART1);
|
|
glue_data_received_cb(&rx, 1);
|
|
uart_clear_interrupt_flag(UART1, UART_INT_RX);
|
|
}
|