Fix error in calculating baud rate generation value
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@1524 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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patacongo
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8dc2132ab3
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@ -50,7 +50,7 @@ CHIP_ASRCS += ez80f91_init.asm
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endif
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CHIP_SSRCS =
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CHIP_CSRCS = ez80_initialstate.c ez80_irq.c ez80_copystate.c \
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CHIP_CSRCS = ez80_clock.c ez80_initialstate.c ez80_irq.c ez80_copystate.c \
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ez80_schedulesigaction.c ez80_sigdeliver.c ez80_timerisr.c \
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ez80_lowuart.c ez80_serial.c ez80_registerdump.c
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ifeq ($(CONFIG_ARCH_CHIP_EZ80F91),y)
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@ -67,7 +67,7 @@
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#endif
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/************************************************************************************
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* Public Function Prototypes
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* Public Data
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************************************************************************************/
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#ifndef __ASSEMBLY__
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@ -78,7 +78,13 @@ extern "C" {
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#define EXTERN extern
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#endif
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#undef EXTERN
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EXTERN uint32 ez80_systemclock;
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/************************************************************************************
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* Public Function Prototypes
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************************************************************************************/
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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@ -0,0 +1,65 @@
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/****************************************************************************
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* arch/z80/src/ez80/ez80_clock.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include "arch/board/board.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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uint32 ez80_systemclock = EZ80_SYS_CLK_FREQ;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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@ -57,9 +57,6 @@
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/* The system clock frequency is defined in the linkcmd file */
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extern unsigned long SYS_CLK_FREQ;
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#define _DEFCLK ((unsigned long)&SYS_CLK_FREQ)
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#ifdef CONFIG_UART0_SERIAL_CONSOLE
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# define ez80_inp(offs) inp((EZ80_UART0_BASE+(offs)))
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# define ez80_outp(offs,val) outp((EZ80_UART0_BASE+(offs)), (val))
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@ -115,7 +112,7 @@ extern unsigned long SYS_CLK_FREQ;
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#ifndef CONFIG_SUPPRESS_UART_CONFIG
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static void ez80_setbaud(void)
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{
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uint24 brg_divisor;
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uint32 brg_divisor;
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ubyte lctl;
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/* The resulting BAUD and depends on the system clock frequency and the
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@ -128,7 +125,7 @@ static void ez80_setbaud(void)
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* BRG_Divisor = SYSTEM_CLOCK_FREQUENCY / 16 / BAUD
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*/
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brg_divisor = ( _DEFCLK + (CONFIG_UART_BAUD << 3)) / (CONFIG_UART_BAUD << 4);
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brg_divisor = (ez80_systemclock + (CONFIG_UART_BAUD << 3)) / (CONFIG_UART_BAUD << 4);
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/* Set the DLAB bit to enable access to the BRG registers */
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@ -62,11 +62,6 @@
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* Definitions
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****************************************************************************/
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/* The system clock frequency is defined in the linkcmd file */
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extern unsigned long SYS_CLK_FREQ;
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#define _DEFCLK ((unsigned long)&SYS_CLK_FREQ)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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@ -291,7 +286,7 @@ static inline void ez80_waittxready(struct ez80_dev_s *priv)
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static inline void ez80_setbaud(struct ez80_dev_s *priv, uint24 baud)
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{
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uint24 brg_divisor;
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uint32 brg_divisor;
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ubyte lctl;
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/* The resulting BAUD and depends on the system clock frequency and the
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@ -304,7 +299,7 @@ static inline void ez80_setbaud(struct ez80_dev_s *priv, uint24 baud)
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* BRG_Divisor = SYSTEM_CLOCK_FREQUENCY / 16 / BAUD
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*/
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brg_divisor = ( _DEFCLK + (baud << 3)) / (baud << 4);
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brg_divisor = (ez80_systemclock + (baud << 3)) / (baud << 4);
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/* Set the DLAB bit to enable access to the BRG registers */
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@ -44,6 +44,10 @@
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* Definitions
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****************************************************************************/
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/* Clocking */
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#define EZ80_SYS_CLK_FREQ 50000000
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/* LED pattern definitions ON OFF */
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#define LED_STARTED 0 /* '0' N/A */
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