s3c2440 裸奔 main函数

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我是靠谱客的博主聪慧枫叶，最近开发中收集的这篇文章主要介绍s3c2440 裸奔 main函数，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

主函数分析不管是从什么时候开始，看主函数永远是第一的

void Main(void)
{
char *mode;
int i;
U8 key;
U32 mpll_val = 0 ;
//U32 divn_upll = 0 ;
#if ADS10
//	__rt_lib_init(); //for ADS 1.0
#endif
Port_Init();
Isr_Init();
i = 2 ;	//don't use 100M!
switch ( i ) {
case 0:	//200
key = 12;
mpll_val = (92<<12)|(4<<4)|(1);
break;
case 1:	//300
key = 13;
mpll_val = (67<<12)|(1<<4)|(1);
break;
case 2:	//400
key = 14;
mpll_val = (92<<12)|(1<<4)|(1);
break;
case 3:	//440!!!
key = 14;
mpll_val = (102<<12)|(1<<4)|(1);
break;
default:
key = 14;
mpll_val = (92<<12)|(1<<4)|(1);
break;
}
//init FCLK=400M, so change MPLL first
ChangeMPllValue((mpll_val>>12)&0xff, (mpll_val>>4)&0x3f, mpll_val&3);
ChangeClockDivider(key, 12);
cal_cpu_bus_clk();
consoleNum = 0;	// Uart 1 select for debug.
Uart_Init( 0,115200 );
Uart_Select( consoleNum );
Beep(2000, 100);
Uart_SendByte('n');
Uart_Printf("<***************************************>n");
Uart_Printf("
TQ2440 Test Programn");
Uart_Printf("
www.embedsky.netn");
//	Uart_Printf("
Build time is: %s
%sn", __DATE__ , __TIME__
);
Uart_Printf("<***************************************>n");
rMISCCR=rMISCCR&~(1<<3); // USBD is selected instead of USBH1
rMISCCR=rMISCCR&~(1<<13); // USB port 1 is enabled.
rDSC0 = 0x2aa;
rDSC1 = 0x2aaaaaaa;
//Enable NAND, USBD, PWM TImer, UART0,1 and GPIO clock,
//the others must be enabled in OS!!!
rCLKCON = 0xfffff0;
MMU_Init();	//
pISR_SWI=(_ISR_STARTADDRESS+0xf0);	//for pSOS
Led_Display(0x66);
mode="DMA";
Clk0_Disable();
Clk1_Disable();
mpll_val = rMPLLCON;
Lcd_TFT_Init() ;
// LCD initial
download_run=1; //The default menu is the Download & Run mode.
while(1)
{
U8 idx;
Uart_Printf("nPlease select function : n");
for(i=0; CmdTip[i].fun!=0; i++)
Uart_Printf("%d : %sn", i, CmdTip[i].tip);
idx = Uart_GetIntNum_GJ() ;
if(idx<i)
{
(*CmdTip[idx].fun)();
Delay(20);
Uart_Init( 0,115200 );
}
}
}








关键的东西在这里，主函数里面就一些初始化，看看datasheet就过去了，后面才是主要的

void Temp_function() { Uart_Printf("nPlease input 1-11 to select test!!!n"); }
struct {
void (*fun)(void);
char *tip;
}CmdTip[] = {
{ Temp_function, "Please input 1-11 to select test" } ,
{ BUZZER_PWM_Test, "Test PWM" } ,
{ RTC_Display, "RTC time display" } ,
{ Test_Adc, "Test ADC" } ,
{ KeyScan_Test, "Test interrupt and key scan" } ,
{ Test_Touchpanel, "Test Touchpanel" } ,
{ Lcd_TFT_Test, "Test TFT LCD" } ,
{ Test_Iic, "Test IIC EEPROM" } ,
{ PlayMusicTest, "UDA1341 play music" } ,
{ RecordTest, "UDA1341 record voice" } ,
{ Test_SDI, "Test SD Card" } ,
{ Camera_Test, "Test CMOS Camera"},
{ 0, 0}
};