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usart.c
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usart.c
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/************************************************************************
*
* Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
* Copyright (c) 2010 libopencm3 project
*
* 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/>.
*
* LICENSE NOTE FOR EXTERNAL LIBOPENCM3 LIBRARY:
*
* The PX4 development team considers libopencm3 to be
* still GPL, not LGPL licensed, as it is unclear if
* each and every author agreed to the LGPS -> GPL change.
*
***********************************************************************/
/*
* USART interface for the bootloader.
*/
#include "hw_config.h"
# include <libopencm3/stm32/rcc.h>
# include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/usart.h>
#include "bl.h"
#include "uart.h"
uint32_t usart;
void uart_cinit(void *config)
{
usart = (uint32_t)config;
/* board is expected to do pin and clock setup */
/* do usart setup */
//USART_CR1(usart) |= (1 << 15); /* because libopencm3 doesn't know the OVER8 bit */
usart_set_baudrate(usart, 921600);
usart_set_databits(usart, 8);
usart_set_stopbits(usart, USART_STOPBITS_1);
usart_set_mode(usart, USART_MODE_TX_RX);
usart_set_parity(usart, USART_PARITY_NONE);
usart_set_flow_control(usart, USART_FLOWCONTROL_NONE);
/* and enable */
usart_enable(usart);
#if 0
usart_send_blocking(usart, 'B');
usart_send_blocking(usart, 'B');
usart_send_blocking(usart, 'B');
usart_send_blocking(usart, 'B');
while (true) {
int c;
c = usart_recv_blocking(usart);
usart_send_blocking(usart, c);
}
#endif
}
void uart7_cinit(uint32_t whichUsart)
{
/* board is expected to do pin and clock setup */
/* do usart setup */
//USART_CR1(usart) |= (1 << 15); /* because libopencm3 doesn't know the OVER8 bit */
usart_set_baudrate(whichUsart, 57600);
usart_set_databits(whichUsart, 8);
usart_set_stopbits(whichUsart, USART_STOPBITS_1);
usart_set_mode(whichUsart, USART_MODE_TX_RX);
usart_set_parity(whichUsart, USART_PARITY_NONE);
usart_set_flow_control(whichUsart, USART_FLOWCONTROL_NONE);
/* and enable */
usart_enable(whichUsart);
#if 0
usart_send_blocking(whichUsart, 'B');
usart_send_blocking(whichUsart, 'B');
usart_send_blocking(whichUsart, 'B');
usart_send_blocking(whichUsart, 'B');
while (true) {
int c;
c = usart_recv_blocking(whichUsart);
usart_send_blocking(whichUsart, c);
}
#endif
}
void uart_cfini(void)
{
usart_disable(usart);
}
void uart7_cfini(uint32_t whichUsart)
{
usart_disable(whichUsart);
}
int uart_cin(void)
{
int c = -1;
if (USART_SR(usart) & USART_SR_RXNE) {
c = usart_recv(usart);
}
return c;
}
int uart7_cin(uint32_t whichUsart)
{
int c = -1;
if (USART_SR(whichUsart) & USART_SR_RXNE) {
c = usart_recv(whichUsart);
}
return c;
}
void uart_cout(uint8_t *buf, unsigned len)
{
//
while (len--) {
usart_send_blocking(usart, *buf++);
}
}
void uart7_cout(uint32_t whichUsart,uint8_t *buf,unsigned len)
{
while (len--) {
usart_send_blocking(whichUsart, *buf++);
while(usart_get_flag(UART7, USART_SR_TC) !=1);
}
}