main.cpp

00001 #include "mbed.h"
00002 
00003 DigitalOut myled(LED1);
00004 
00005 extern int stdio_retargeting_module;
00006 
00007 /**
00008  * Initialize the system
00009  *
00010  * @param  none
00011  * @return none
00012  *
00013  * @brief  Setup the microcontroller system.
00014  *         Initialize the System.
00015 */
00016 extern "C" void $Sub$$SystemInit (void)
00017 {
00018 
00019 // select the PLL input
00020     LPC_SYSCON->SYSPLLCLKSEL  = 0x0;                // Select PLL Input source 0=IRC, 1=OSC
00021     LPC_SYSCON->SYSPLLCLKUEN  = 0x01;               /* Update Clock Source      */
00022     LPC_SYSCON->SYSPLLCLKUEN  = 0x00;               /* Toggle Update Register   */
00023     LPC_SYSCON->SYSPLLCLKUEN  = 0x01;
00024     while (!(LPC_SYSCON->SYSPLLCLKUEN & 0x01));     /* Wait Until Updated       */
00025 
00026 // Power up the system PLL
00027     LPC_SYSCON->SYSPLLCTRL    = 0x00000023;
00028     LPC_SYSCON->PDRUNCFG     &= ~(1 << 7);          /* Power-up SYSPLL          */
00029     while (!(LPC_SYSCON->SYSPLLSTAT & 0x01));       /* Wait Until PLL Locked    */
00030 
00031 // Select the main clock source
00032     LPC_SYSCON->MAINCLKSEL    = 0x3;                // Select main Clock source, 0=IRC, 1=PLLin, 2=WDO, 3=PLLout
00033     LPC_SYSCON->MAINCLKUEN    = 0x01;               /* Update MCLK Clock Source */
00034     LPC_SYSCON->MAINCLKUEN    = 0x00;               /* Toggle Update Register   */
00035     LPC_SYSCON->MAINCLKUEN    = 0x01;
00036     while (!(LPC_SYSCON->MAINCLKUEN & 0x01));       /* Wait Until Updated       */
00037 
00038     LPC_SYSCON->SYSAHBCLKDIV  = 0x00000001;
00039 
00040     LPC_SYSCON->PDRUNCFG     &= ~(1 << 10);         /* Power-up USB PHY         */
00041     LPC_SYSCON->PDRUNCFG     &= ~(1 <<  8);         /* Power-up USB PLL         */
00042     LPC_SYSCON->USBPLLCLKSEL  = 0x0;                // 0=IRC, 1=System clock, only good for low speed
00043     LPC_SYSCON->USBPLLCLKUEN  = 0x01;               /* Update Clock Source      */
00044     LPC_SYSCON->USBPLLCLKUEN  = 0x00;               /* Toggle Update Register   */
00045     LPC_SYSCON->USBPLLCLKUEN  = 0x01;
00046 
00047     while (!(LPC_SYSCON->USBPLLCLKUEN & 0x01));     /* Wait Until Updated       */
00048     LPC_SYSCON->USBPLLCTRL    = 0x00000023;
00049 
00050     while (!(LPC_SYSCON->USBPLLSTAT   & 0x01));     /* Wait Until PLL Locked    */
00051     LPC_SYSCON->USBCLKSEL     = 0x00;               /* Select USB PLL           */
00052 
00053     LPC_SYSCON->USBCLKSEL     = 0x00000000;      /* Select USB Clock         */
00054     LPC_SYSCON->USBCLKDIV     = 0x00000001;      /* Set USB clock divider    */
00055 
00056     /* System clock to the IOCON needs to be enabled or
00057     most of the I/O related peripherals won't work. */
00058     LPC_SYSCON->SYSAHBCLKCTRL |= (1<<16);
00059     stdio_retargeting_module = 1;
00060 
00061 }
00062 
00063 
00064 int main()
00065 {
00066     while(1) {
00067         myled = 1;
00068         wait(0.25);
00069         myled = 0;
00070         wait(0.25);
00071     }
00072 }