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/*
* cpu/mc9328/serial.c
*
* (c) Copyright 2004
* Techware Information Technology, Inc.
* http://www.techware.com.tw/
*
* Ming-Len Wu <minglen_wu@techware.com.tw>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <mc9328.h>
#if defined(CONFIG_UART1)
/* GPIO PORT B */
#define reg_GIUS MX1_GIUS_C
#define reg_GPR MX1_GPR_B
#define GPIO_MASK 0xFFFFE1FF
#define UART_BASE 0x00206000
#elif defined (CONFIG_UART2)
/* GPIO PORT C */
#define reg_GIUS MX1_GIUS_C
#define reg_GPR MX1_GPR_C
#define GPIO_MASK 0x0FFFFFFF
#define UART_BASE 0x207000
#endif
#define reg_URXD (*((volatile u32 *)(UART_BASE+0x00)))
#define reg_UTXD (*((volatile u32 *)(UART_BASE+0x40)))
#define reg_UCR1 (*((volatile u32 *)(UART_BASE+0x80)))
#define reg_UCR2 (*((volatile u32 *)(UART_BASE+0x84)))
#define reg_UCR3 (*((volatile u32 *)(UART_BASE+0x88)))
#define reg_UCR4 (*((volatile u32 *)(UART_BASE+0x8C)))
#define reg_UFCR (*((volatile u32 *)(UART_BASE+0x90)))
#define reg_USR1 (*((volatile u32 *)(UART_BASE+0x94)))
#define reg_USR2 (*((volatile u32 *)(UART_BASE+0x98)))
#define reg_UESC (*((volatile u32 *)(UART_BASE+0x9C)))
#define reg_UTIM (*((volatile u32 *)(UART_BASE+0xA0)))
#define reg_UBIR (*((volatile u32 *)(UART_BASE+0xA4)))
#define reg_UBMR (*((volatile u32 *)(UART_BASE+0xA8)))
#define reg_UBRC (*((volatile u32 *)(UART_BASE+0xAC)))
#define TXFE_MASK 0x4000 /* Tx buffer empty */
#define RDR_MASK 0x0001 /* receive data ready */
void serial_setbrg (void) {
/* config I/O pins for UART */
reg_GIUS &= GPIO_MASK;
reg_GPR &= GPIO_MASK;
/* config UART */
reg_UCR1 = 5;
reg_UCR2 = 0x4027;
reg_UCR4 = 1;
reg_UFCR = 0xA81;
reg_UBIR = 0xF;
reg_UBMR = 0x8A;
reg_UBRC = 8;
}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*
*/
int serial_init (void) {
serial_setbrg ();
return (0);
}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
int serial_getc (void) {
while (!(reg_USR2 & RDR_MASK)) ; /* wait until RDR bit set */
return (u8)reg_URXD;
}
/*
* Output a single byte to the serial port.
*/
void serial_putc (const char c) {
while (!(reg_USR2 & TXFE_MASK)); /* wait until TXFE bit set */
reg_UTXD = (u16) c;
if (c == '\n') { /* carriage return ? append line-feed */
while (!(reg_USR2 & TXFE_MASK)); /* wait until TXFE bit set */
reg_UTXD = '\r';
}
}
/*
* Test whether a character is in the RX buffer
*/
int serial_tstc (void) {
return reg_USR2 & RDR_MASK;
}
void serial_puts (const char *s) {
while (*s) {
serial_putc (*s++);
}
}
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