/****************************************************************************
* arch/z80/src/z8/z8_loweruart.c
*
* Copyright (C) 2008-2009, 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <string.h>
#include <ez8.h>
#include <nuttx/arch.h>
#include <nuttx/sched.h>
#include "chip/chip.h"
#include "common/up_internal.h"
#ifdef USE_LOWSERIALINIT
extern uint32_t get_freq(void);
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_lowserialinit
****************************************************************************/
void up_lowserialinit(void)
{
#if defined(CONFIG_UART0_SERIAL_CONSOLE) || \
(defined(EZ8_UART1) && defined(CONFIG_UART1_SERIAL_CONSOLE))
uint32_t freq = get_freq();
uint16_t brg;
uint8_t val;
#endif
#ifdef CONFIG_UART0_SERIAL_CONSOLE
/* Set the baudrate */
brg = (freq +(uint32_t)CONFIG_UART0_BAUD * 8) /((uint32_t)CONFIG_UART0_BAUD * 16) ;
putreg8(brg >> 8, U0BRH);
putreg8(brg & 0xff, U0BRL);
/* Configure GPIO Port A pins 4 & 5 for alternate function */
putreg8(0x02, PAADDR);
val = getreg8(PACTL) | 0x30; /* Set bits in alternate function register */
putreg8(val, PACTL);
putreg8(0x07, PAADDR);
val = getreg8(PACTL) & 0xcf; /* Reset bits in alternate function set-1 register */
putreg8(val, PACTL);
putreg8(0x08, PAADDR);
val = getreg8(PACTL) & 0xcf; /* Reset bits in alternate function set-2 register */
putreg8(val, PACTL);
putreg8(0x00, PAADDR);
putreg8(0x00, U0CTL1); /* no multi-processor operation mode */
putreg8(0xc0, U0CTL0); /* Transmit enable, Receive enable, no Parity, 1 Stop bit */
#elif defined(EZ8_UART1) && defined(CONFIG_UART1_SERIAL_CONSOLE)
/* Set the baudrate */
brg = (freq +(uint32_t)CONFIG_UART1_BAUD * 8) /((uint32_t)CONFIG_UART1_BAUD * 16) ;
putreg8(brg >> 8, U1BRH);
putreg8(brg & 0xff, U1BRL);
/* Configure GPIO Port D pins 4 & 5 for alternate function */
putreg8(0x02, PAADDR);
val = getreg8(PDCTL) | 0x30; /* Set bits in alternate function register */
putreg8(val, PDCTL);
putreg8(0x07, PDADDR);
val = getreg8(PDCTL) & 0xcf; /* Reset bits in alternate function set-1 register */
putreg8(val, PDCTL);
putreg8(0x08, PDADDR);
val = getreg8(PDCTL) & 0xcf; /* Reset bits in alternate function set-2 register */
putreg8(val, PDCTL);
putreg8(0x00, PDADDR);
putreg8(0x00, U1CTL1); /* no multi-processor operation mode */
putreg8(0xc0, U1CTL0); /* Transmit enable, Receive enable, no Parity, 1 Stop bit */
#endif
}
#endif /* USE_LOWSERIALINIT */
