Diff: main.cpp

Revision:

0:00bd9bd5755f

Child:

1:0ad292799828

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 20 12:16:03 2012 +0000
@@ -0,0 +1,74 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+
+extern int stdio_retargeting_module;
+
+/**
+ * Initialize the system
+ *
+ * @param  none
+ * @return none
+ *
+ * @brief  Setup the microcontroller system.
+ *         Initialize the System.
+*/
+extern "C" void $Sub$$SystemInit (void)
+{
+
+// select the PLL input
+    LPC_SYSCON->SYSPLLCLKSEL  = 0x0;                // Select PLL Input source 0=IRC, 1=OSC
+    LPC_SYSCON->SYSPLLCLKUEN  = 0x01;               /* Update Clock Source      */
+    LPC_SYSCON->SYSPLLCLKUEN  = 0x00;               /* Toggle Update Register   */
+    LPC_SYSCON->SYSPLLCLKUEN  = 0x01;
+    while (!(LPC_SYSCON->SYSPLLCLKUEN & 0x01));     /* Wait Until Updated       */
+
+// Power up the system PLL
+    LPC_SYSCON->SYSPLLCTRL    = 0x00000023;
+    LPC_SYSCON->PDRUNCFG     &= ~(1 << 7);          /* Power-up SYSPLL          */
+    while (!(LPC_SYSCON->SYSPLLSTAT & 0x01));       /* Wait Until PLL Locked    */
+
+// Select the main clock source
+    LPC_SYSCON->MAINCLKSEL    = 0x3;                // Select main Clock source, 0=IRC, 1=PLLin, 2=WDO, 3=PLLout
+    LPC_SYSCON->MAINCLKUEN    = 0x01;               /* Update MCLK Clock Source */
+    LPC_SYSCON->MAINCLKUEN    = 0x00;               /* Toggle Update Register   */
+    LPC_SYSCON->MAINCLKUEN    = 0x01;
+    while (!(LPC_SYSCON->MAINCLKUEN & 0x01));       /* Wait Until Updated       */
+
+    LPC_SYSCON->SYSAHBCLKDIV  = 0x00000001;
+
+    LPC_SYSCON->PDRUNCFG     &= ~(1 << 10);         /* Power-up USB PHY         */
+    LPC_SYSCON->PDRUNCFG     &= ~(1 <<  8);         /* Power-up USB PLL         */
+    LPC_SYSCON->USBPLLCLKSEL  = 0x0;                // 0=IRC, 1=System clock, only good for low speed
+    LPC_SYSCON->USBPLLCLKUEN  = 0x01;               /* Update Clock Source      */
+    LPC_SYSCON->USBPLLCLKUEN  = 0x00;               /* Toggle Update Register   */
+    LPC_SYSCON->USBPLLCLKUEN  = 0x01;
+
+    while (!(LPC_SYSCON->USBPLLCLKUEN & 0x01));     /* Wait Until Updated       */
+    LPC_SYSCON->USBPLLCTRL    = 0x00000023;
+
+    while (!(LPC_SYSCON->USBPLLSTAT   & 0x01));     /* Wait Until PLL Locked    */
+    LPC_SYSCON->USBCLKSEL     = 0x00;               /* Select USB PLL           */
+
+    LPC_SYSCON->USBCLKSEL     = 0x00000000;      /* Select USB Clock         */
+    LPC_SYSCON->USBCLKDIV     = 0x00000001;      /* Set USB clock divider    */
+
+    /* System clock to the IOCON needs to be enabled or
+    most of the I/O related peripherals won't work. */
+    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<16);
+    stdio_retargeting_module = 1;
+
+}
+
+
+
+
+int main()
+{
+    while(1) {
+        myled = 1;
+        wait(0.25);
+        myled = 0;
+        wait(0.25);
+    }
+}