LPC1778 SDRAM调试程序
项目上用的MCU（LPC1778）,要求 SDRAM运行程序，查了很多资料，实现MCU 内部flash 跳转至SDRAM运行程序前前后后，参考了几个帖子,非常感谢这几个帖子中的调试经验啊啊啊啊:
链接放不上......{:sweat:} {:sweat:} {:sweat:}
直接上图（keil的 配置）：
3.SDRAM调试 加载的脚本文件如下：
3.1.1SDRAM驱动文件 （SDRAM.ini）：
FUNC void PinSel(int p1, int n1, int f1)
{
_WDWORD(0x4002C000 + (p1 * 32 + n1) * 4, (1 << 9) | f1);
}
FUNC void InitSDRAM(void)
{
int i;
PinSel(2,16,1);
PinSel(2,17,1);
PinSel(2,18,1);
PinSel(2,20,1);
PinSel(2,24,1);
PinSel(2,28,1);
PinSel(2,29,1);
for(i = 0; i < 16; i++)
PinSel(3,i,1);
for(i = 0; i < 15; i++)
PinSel(4,i,1);
PinSel(4,24,1);
PinSel(4,25,1);
_WDWORD(0x400FC1DC, (8 << 16)|(8 << 8)|(0xA << 1));
_sleep_(8);
// Initialize EMC
_WDWORD(0x2009C000, 0x00000001); // CONTROL=1 = Enable EMC
_WDWORD(0x2009C008, 0x00000000); // CONFIG=0
_WDWORD(0x2009C100, 0x00000280); // DYNAMICCONFIG0
_WDWORD(0x2009C104, 0x00000202); // DYNAMICRASCAS0
_WDWORD(0x2009C028, 0x00000001); // DYNAMICREADCONFIG
_WDWORD(0x2009C030, 0x00000001); // DYNAMICRP
_WDWORD(0x2009C034, 0x00000002); // DYNAMICRAS
_WDWORD(0x2009C038, 0x00000001); // DYNAMICREX
_WDWORD(0x2009C03C, 0x00000000); // DYNAMICAPR
_WDWORD(0x2009C040, 0x00000003); // DYNAMICDAL
_WDWORD(0x2009C044, 0x00000002); // DYNAMICWR
_WDWORD(0x2009C048, 0x00000003); // DYNAMICRC
_WDWORD(0x2009C04C, 0x00000003); // DYNAMICRFC
_WDWORD(0x2009C050, 0x00000001); // DYNAMICXSR
_WDWORD(0x2009C054, 0x00000000); // DYNAMICRRD
_WDWORD(0x2009C058, 0x00000002); // DYNAMICMRD
_sleep_(100);
_WDWORD(0x2009C020, 0x00000183); // DYNAMICCONTROL - NOP
_sleep_(100);
_WDWORD(0x2009C020, 0x00000103); // DYNAMICCONTROL - PRECHARGE_ALL
_sleep_(100);
_WDWORD(0x2009C024, 0x00000046); // DYNAMICREFRESH = 1D
_WDWORD(0x2009C020, 0x00000083); // DYNAMICCONTROL - MODE
_sleep_(200);
_RDWORD(0xA0000000 | (0x23<<11));// Write 16-bit SDRAM Mode register burst 8- this is a read as requested by the SDRAM spec
_WDWORD(0x2009C020, 0x00000000); // DYNAMICCONTROL - NORMAL
_WDWORD(0x2009C100, (1 << 19) | 0x00000280); // DYNAMICCONFIG0
_sleep_(100);
}
FUNC void Clock_Setup (void) {
_WDWORD(0x400FC1A0, 0x00000021); // Enable the crystal oscillator
// while((_RDWORD(0x400FC1A0) & (1<<6)) == 0); // delay wait for oscillator to start
_sleep_ (100); // Wait for main oscillator to stabilize
_WDWORD(0x400FC10C, 0x00000001); // select crystal oscillator
_WDWORD(0x400FC084, 0x00000028); // Configure PLL0 to multiply x 10 for 120 MHz operation from 12 MHz crystal
_WDWORD(0x400FC080, 0x00000001); // PLL0 Enable
_WDWORD(0x400FC08C, 0x000000AA); //
_WDWORD(0x400FC08C, 0x00000055); //
// while((_RDWORD(0x400FC088) & (1<<10)) == 0); // Wait for PLOCK0
_sleep_ (100); // Wait for PLOCK0
_WDWORD(0x400FC0A4, 0x0000002B); // Configure PLL0 to multiply x 10 for 120 MHz operation from 12 MHz crystal
_WDWORD(0x400FC0A0, 0x00000001); // PLL0 Enable
_WDWORD(0x400FC0AC, 0x000000AA); //
_WDWORD(0x400FC0AC, 0x00000055); //
_sleep_ (100);
_WDWORD(0x400FC104, 0x00000102); //PLL0 not divide as the cpuclock
_WDWORD(0x400FC100, 0x00000000); //cpuclock / 2 as the emcclock
_WDWORD(0x400FC1A8, 0x00000004); //cpuclock / 2 as the pclock
_WDWORD(0x400FC0C4, 0x00008800); //emcclock gpio enable
_WDWORD(0x400FC1B0, 0x00000000); //120M support
}
3.1.2 加载的脚本（RAM.ini）:
INCLUDE SDRAM.ini
FUNC void mpu_region_setup(unsigned int a_addr,
unsigned int a_region,
unsigned int a_size,
unsigned int a_ap,
unsigned int a_mem_attrib,
unsigned int a_srd,
unsigned int a_XN,
unsigned int a_enable )
{
// Setup procedure for each region
unsigned int temp;
temp = (a_addr & 0xFFFFFFE0) | (a_region & 0xF) | 0x10 ;
_WDWORD(0xE000ED9C, temp); // RBAR
temp = ((a_XN & 0x1)<<28) | ((a_ap & 0x7)<<24) | ((a_mem_attrib & 0x3F)<<16) | ((a_srd&0xFF)<<8) | ((a_size & 0x1F)<<1)| (a_enable & 0x1) ;
_WDWORD(0xE000EDA0, temp); // RASR
_WDWORD(0xE000ED24, 1<<18); // usage fault enable
_WDWORD(0xE000ED94, 5); // MPU enable
}
FUNC void Setup (unsigned int region) {
region &= 0xFF000000;
// _WDWORD(0x40043100, 0); // Set the shadow pointer to zero (can't map SDRAM to 0)
SP = _RDWORD(region); // Setup Stack Pointer
PC = _RDWORD(region + 4); // Setup Program Counter
_WDWORD(0xE000ED08, region); // Set the vector table offset
}
Clock_Setup();
InitSDRAM();
LOAD%L INCREMENTAL // Download
mpu_region_setup( 0xA0000000,0,0x16,3,7,0,0,1);
Setup(0xA0000000); // Setup for Running
3.1.3 调试注意：
1.外设、IO（SDRAM） 请勿重新初始化 ，会造成程序重启
2.SDRAM 调试不能下载操作，得在调试模式调试代码
3.不同的SDRAM器件，需阅读数据手册，重新配置，上面的代码配置的（主频72M、IS42S16400F）
4.重要的代码，推荐强制定位到MCU内部 SRAM区域 如果要改成lpc1857 用sdram 是要修改那里? liang16888 发表于 2018-7-20 11:44
如果要改成lpc1857 用sdram 是要修改那里?
没接触过这款MCU，应该和1778 差不多吧，初始化流程，port，clock，emc ...
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