📄 target.c
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/****************************************Copyright (c)****************************************************
** Guangzhou ZHIYUAN electronics Co.,LTD.
**
** http://www.embedtools.com
**
**--------------File Info---------------------------------------------------------------------------------
** File name: target.c
** Last modified Date: 2004-09-17
** Last Version: 1.0
** Descriptions: header file of the specific codes for LPC2200 target boards
** Every project should include a copy of this file, user may modify it as needed
**--------------------------------------------------------------------------------------------------------
** Created by: Chenmingji
** Created date: 2004-02-02
** Version: 1.0
** Descriptions: The original version
**
**--------------------------------------------------------------------------------------------------------
** Modified by: Chenmingji
** Modified date: 2004-09-17
** Version: 1.01
** Descriptions: Renewed the template, added more compiler supports
**
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
*********************************************************************************************************/
#define IN_TARGET
#include "config.h"
/*********************************************************************************************************
* Function name: DelayNS
* Descriptions: 长软件延时
* input parameters: idly 延时参数，值越大，延时越久
* output parameters: none
* Returned value: none
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
void sysDelayNS(INT32U uiDly)
{
INT32U i;
for(; uiDly > 0; uiDly--){
for(i = 0; i < 5000; i++);
}
}
/*********************************************************************************************************
** Function name: TargetInit
**
** Descriptions: Initialize the target board; it is called in a necessary place, change it as
** needed
**
** input parameters: None
** output parameters: None
** Returned value: None
**
** Created by: Chenmingji
** Created Date: 2004/02/02
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
void TargetInit (void)
{
}
/*********************************************************************************************************
** Function name: SDRAMInit
** Descriptions: 初始化SDRAM
** input parameters: none
** output parameters: none
**
** Created by: zhangzheng
** Created Date: 2007.12.10
**-------------------------------------------------------------------------------------------------------
** Modified by: zhanghuping
** Modified date: 2008.04.25
**-------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
void SDRAMInit( void )
{
uint32 i, dummy ;
/*
* 使能SDRAM总线连接
*/
PINSEL4 = 0x50000000;
PINSEL5 = 0x05050555;
PINSEL6 |= 0x55555555;
PINSEL8 |= 0x55555555;
PINSEL9 |= 0x50555555;
EMCControl = 0x00000001; /* Disable Address mirror */
/*
* 设置SDRAM访问时序.
*/
EMCDynamictRP = 1;
EMCDynamictRAS = 3;
EMCDynamictSREX = 1;
EMCDynamictAPR = 1;
EMCDynamictDAL = 5;
EMCDynamictWR = 2;
EMCDynamictRC = 3;
EMCDynamictRFC = 3;
EMCDynamictXSR = 5;
EMCDynamictRRD = 1;
EMCDynamictMRD = 2;
EMCDynamicReadConfig =1; /* Command delayed strategy */
/*
* Default setting, RAS latency 3 CCLKs, CAS latenty 3 CCLKs.
*/
EMCDynamicRASCAS0 = 0x00000303;
/*
* 256MB, 16Mx16, 4 banks, row=13, column=9
*/
EMCDynamicConfig0 = 0x00000680;
#ifdef __OUT_CHIP
sysDelayNS(2);
#else
sysDelayNS(4);
#endif /* __OUT_CHIP */
/*
* Mem clock enable, CLKOUT runs, send command: NOP
*/
EMCDynamicControl = 0x00000183;
#ifdef __OUT_CHIP
sysDelayNS(2);
#else
sysDelayNS(4);
#endif /* __OUT_CHIP */
/*
* Send command: PRECHARGE-ALL, shortest possible refresh period
*/
EMCDynamicControl = 0x00000103;
#ifdef __OUT_CHIP
sysDelayNS(2);
#else
sysDelayNS(4);
#endif /* __OUT_CHIP */
/*
* set 32 CCLKs between SDRAM refresh cycles
*/
EMCDynamicRefresh = 0x00000002;
for(i = 0; i < 0x80; i++); /* wait 128 AHB clock cycles */
/* set 28 x 16CCLKs=448CCLK=7us between SDRAM refresh cycles */
EMCDynamicRefresh = 28;
/*
* To set mode register in SDRAM, enter mode by issue
* MODE command, after finishing, bailout and back to NORMAL mode.
*/
EMCDynamicControl = 0x00000083;
/*
* Mem clock enable, CLKOUT runs, send command: MODE
*/
dummy=*((volatile uint32 *)(0xa0033000));
EMCDynamicControl = 0x00000000; /* Send command: NORMAL */
EMCDynamicConfig0 |= 0x00080000; /* Enable buffer */
sysDelayNS(10);
}
/*********************************************************************************************************
** Function name: TargetResetInit
** Descriptions: Initialize the target
** input parameters: None
** output parameters: None
** Returned value: None
** Created by: Chenmingji
** Created Date: 2004/02/02
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**--------------------------------------------------------------------------------------------------------
*********************************************************************************************************/
extern void Reset(void);
void TargetResetInit (void)
{
#ifdef __IN_RAM
SDRAMInit(); /* 配置外部SDRAM */
MEMMAP = 0x02; /* remap 从片内Flash */
#endif
#ifdef __IN_CHIP
SDRAMInit(); /* 配置外部SDRAM */
MEMMAP = 0x01; /* remap 从片内Flash */
#endif /* __IN_CHIP */
#ifdef __OUT_CHIP
/*
* Edit for LPC2460/70
* 将中断向量表复制到片内
* 的SRAM的前64个字节
*/
uint8 i;
uint32 *cp1,*cp2;
cp1=(uint32*)Reset;
cp2=(uint32*)0x40000000;
for(i=0;i<16;i++)
{
*cp2++ = *cp1++;
}
MEMMAP = 0x02; /* remap 到内部RAM */
EMCControl = 0x01; /* 使能外部EMC，禁止镜像 */
SDRAMInit(); /* 配置外部SDRAM */
#endif /* __OUT_CHIP */
#ifdef __DEBUG_SDRAM
/*
* Edit for LPC2460/70
* 将中断向量表复制到片内
* 的SRAM的前64个字节
*/
uint8 i;
uint32 *cp1,*cp2;
cp1=(uint32*)Reset;
cp2=(uint32*)0x40000000;
for(i=0;i<16;i++)
{
*cp2++ = *cp1++;
}
MEMMAP = 0x2; /* remap 从内部SRAM映射 */
#endif /* __DEBUG_SDRAM */
if ( PLLSTAT & (1 << 25) )
{
PLLCON = 1; /* Enable PLL, disconnected */
PLLFEED = 0xAA;
PLLFEED = 0x55;
}
PLLCON = 0; /* Disable PLL, disconnected */
PLLFEED = 0xAA;
PLLFEED = 0x55;
while(PLLSTAT & (3 << 24));
SCS = (SCS & 0x04)|0x20; /* Enable the mainOSC,1MHz~20MHz*/
while((SCS & 0x40) == 0 ); /* Wait until main OSC is usable*/
CLKSRCSEL = 0x01; /* select main OSC as the PLL */
/* clock source */
PLLCFG = (((PLL_NValue) << 16)|(PLL_MValue));
PLLCON = 1;
PLLFEED = 0xAA; /* Enable but disconnect the PLL*/
PLLFEED = 0x55;
while (((PLLSTAT & (1 << 24)) == 0)); /* Wait until the PLL is usable */
CCLKCFG = CCLKDivValue;
#if USE_USB
USBCLKCFG = USBCLKDivValue; /* usbclk = 480 MHz/10 = 48 MHz */
PCONP |= 0x80000000; /* Turn On USB PCLK */
#else
USBCLKCFG = USBCLKDivValue;
PCONP &= 0x7FFFFFFF;
#endif /* USE_USB */
while ( ((PLLSTAT & (1 << 26)) == 0) ); /* Check lock bit status */
while (((PLLSTAT & 0x00007FFF) != PLL_MValue) && (((PLLSTAT & 0x00FF0000) >> 16) != PLL_NValue));
PLLCON = 3; /* connect the PLL */
PLLFEED = 0xAA;
PLLFEED = 0x55;
while (((PLLSTAT & (1 << 25))!= (1 << 25))); /* Wait until the PLL is */
/* connected and locked */
/*
* Set system timers for each component
*/
#if (Fpclk / (Fcclk / 4)) == 1
PCLKSEL0 = 0x00000000; /* PCLK is 1/4 CCLK */
PCLKSEL1 = 0x00000000;
#else
#if (Fpclk / (Fcclk / 4)) == 2
PCLKSEL0 = 0xAAAAAAAA; /* PCLK is 1/2 CCLK */
PCLKSEL1 = 0xAAAAAAAA;
#else
PCLKSEL0 = 0x55555555; /* PCLK is the same as CCLK */
PCLKSEL1 = 0x55555555;
#endif
#endif
/*
* Set memory accelerater module
*/
MAMCR = 0;
#if Fcclk < 20000000
MAMTIM = 1;
#else
#if Fcclk < 40000000
MAMTIM = 2;
#else
MAMTIM = 3;
#endif
#endif
MAMCR = 2;
/*
* Add your codes here
*/
return;
}
/*********************************************************************************************************
以下为一些与系统相关的库函数的实现
具体作用请ads的参考编译器与库函数手册
用户可以根据自己的要求修改
*********************************************************************************************************/
#pragma import(__use_no_semihosting_swi)
#pragma import(__use_two_region_memory)
void _ttywrch (int ch)
{
ch = ch;
}
/*********************************************************************************************************
End File
*********************************************************************************************************/
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