forked from Imagelibrary/rtems
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
|
|
|
|
/*
|
|
* Uart driver for Lattice Mico32 (lm32) UART
|
|
*/
|
|
|
|
/*
|
|
* COPYRIGHT (c) 1989-1999.
|
|
* On-Line Applications Research Corporation (OAR).
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* Jukka Pietarinen <jukka.pietarinen@mrf.fi>, 2008,
|
|
* Micro-Research Finland Oy
|
|
*/
|
|
|
|
#include "../include/system_conf.h"
|
|
#include "uart.h"
|
|
#include <bsp.h>
|
|
#include <rtems/libio.h>
|
|
|
|
static inline int uartread(unsigned int reg)
|
|
{
|
|
return *((int*)(UART_BASE_ADDRESS + reg));
|
|
}
|
|
|
|
static inline void uartwrite(unsigned int reg, int value)
|
|
{
|
|
*((int*)(UART_BASE_ADDRESS + reg)) = value;
|
|
}
|
|
|
|
void BSP_uart_init(int baud)
|
|
{
|
|
/* Disable UART interrupts */
|
|
uartwrite(LM32_UART_IER, 0);
|
|
|
|
/* Line control 8 bit, 1 stop, no parity */
|
|
uartwrite(LM32_UART_LCR, LM32_UART_LCR_8BIT);
|
|
|
|
/* Modem control, DTR = 1, RTS = 1 */
|
|
uartwrite(LM32_UART_MCR, LM32_UART_MCR_DTR | LM32_UART_MCR_RTS);
|
|
|
|
/* Set baud rate */
|
|
uartwrite(LM32_UART_DIV, CPU_FREQUENCY/baud);
|
|
}
|
|
|
|
void BSP_uart_polled_write(char ch)
|
|
{
|
|
/* Insert CR before LF */
|
|
if (ch == '\n')
|
|
BSP_uart_polled_write('\r');
|
|
/* Wait until THR is empty. */
|
|
while (!(uartread(LM32_UART_LSR) & LM32_UART_LSR_THRE));
|
|
uartwrite(LM32_UART_RBR, ch);
|
|
}
|
|
|
|
int BSP_uart_polled_read( void )
|
|
{
|
|
/* Wait until there is a byte in RBR */
|
|
while (!(uartread(LM32_UART_LSR) & LM32_UART_LSR_DR));
|
|
return (int) uartread(LM32_UART_RBR);
|
|
}
|
|
|
|
char BSP_uart_is_character_ready(char *ch)
|
|
{
|
|
if (uartread(LM32_UART_LSR) & LM32_UART_LSR_DR)
|
|
{
|
|
*ch = (char) uartread(LM32_UART_RBR);
|
|
return true;
|
|
}
|
|
*ch = '0';
|
|
return false;
|
|
}
|