Diff: PWR/NMI_PowerDown/nmi_powerdown.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PWR/NMI_PowerDown/nmi_powerdown.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,163 @@
+/***********************************************************************//**
+ * @file		nmi_powerdown.c
+ * @purpose		This example describes how to enter the system in Power
+ * 				Down mode and wake-up by using NMI (Non-maskable Interrupt)
+ * @version		1.0
+ * @date		18. June. 2010
+ * @author		NXP MCU SW Application Team
+ *---------------------------------------------------------------------
+ * Software that is described herein is for illustrative purposes only
+ * which provides customers with programming information regarding the
+ * products. This software is supplied "AS IS" without any warranties.
+ * NXP Semiconductors assumes no responsibility or liability for the
+ * use of the software, conveys no license or title under any patent,
+ * copyright, or mask work right to the product. NXP Semiconductors
+ * reserves the right to make changes in the software without
+ * notification. NXP Semiconductors also make no representation or
+ * warranty that such application will be suitable for the specified
+ * use without further testing or modification.
+ **********************************************************************/
+#include "LPC17xx.h"
+#include "lpc17xx_clkpwr.h"
+#include "lpc17xx_libcfg.h"
+#include "debug_frmwrk.h"
+#include "lpc17xx_gpio.h"
+#include "lpc17xx_pinsel.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup PWR_NMI_PowerDown	NMI_PowerDown
+ * @ingroup PWR_Examples
+ * @{
+ */
+
+/************************** PRIVATE VARIABLES *************************/
+uint8_t menu[]=
+	"********************************************************************************\n\r"
+	"Hello NXP Semiconductors \n\r"
+	"Power control demo \n\r"
+	"\t - MCU: LPC17xx \n\r"
+	"\t - Core: ARM CORTEX-M3 \n\r"
+	"\t - Communicate via: UART0 - 115200 bps \n\r"
+	"This example used to enter system in PowerDown mode and wake up it by using \n\r "
+	"NMI (Non-Maskable Interrupt) \n\r"
+	"********************************************************************************\n\r";
+void print_menu(void);
+void NMI_Handler(void);
+
+
+/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
+/*********************************************************************//**
+ * @brief		Non-Maskable interrupt handler
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void NMI_Handler(void)
+{
+	//do nothing
+}
+
+/*-------------------------PRIVATE FUNCTIONS------------------------------*/
+/*********************************************************************//**
+ * @brief		Print Welcome menu
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void print_menu(void)
+{
+	_DBG(menu);
+}
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry (void)
+{
+	PINSEL_CFG_Type PinCfg;
+	/* Initialize debug via UART0
+	 * – 115200bps
+	 * – 8 data bit
+	 * – No parity
+	 * – 1 stop bit
+	 * – No flow control
+	 */
+	debug_frmwrk_init();
+
+	// print welcome screen
+	print_menu();
+
+	/* Pin selection:
+	 * P2.10 as NMI
+	 */
+	PinCfg.Funcnum = 2;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Portnum = 2;
+	PinCfg.Pinnum = 10;
+	PINSEL_ConfigPin(&PinCfg);
+
+	SCB->ICSR |=(1<<31); 	//changes NMI exception state to pending
+
+	_DBG_("Press '1' to enter system in PowerDown mode");
+	while(_DG !='1');
+
+	_DBG_("Enter PowerDown mode...");
+	_DBG_("Press INT0 button to wake-up system");
+
+	// Enter target power down mode
+
+	/*---------- Disable and disconnect the main PLL0 before enter into Deep-Sleep
+	 * or Power-Down mode <according to errata.lpc1768-16.March.2010> ------------
+	 */
+	LPC_SC->PLL0CON &= ~(1<<1); /* Disconnect the main PLL (PLL0) */
+	LPC_SC->PLL0FEED = 0xAA; /* Feed */
+	LPC_SC->PLL0FEED = 0x55; /* Feed */
+	while ((LPC_SC->PLL0STAT & (1<<25)) != 0x00); /* Wait for main PLL (PLL0) to disconnect */
+	LPC_SC->PLL0CON &= ~(1<<0); /* Turn off the main PLL (PLL0) */
+	LPC_SC->PLL0FEED = 0xAA; /* Feed */
+	LPC_SC->PLL0FEED = 0x55; /* Feed */
+	while ((LPC_SC->PLL0STAT & (1<<24)) != 0x00); /* Wait for main PLL (PLL0) to shut down */
+	/*------------Then enter into PowerDown mode ----------------------------------*/
+
+	CLKPWR_PowerDown();
+	SystemInit();
+	debug_frmwrk_init();
+	_DBG_("\n\rSystem waked-up!");
+	while(1);
+	return 1;
+}
+
+
+/* With ARM and GHS toolsets, the entry point is main() - this will
+   allow the linker to generate wrapper code to setup stacks, allocate
+   heap area, and initialize and copy code and data segments. For GNU
+   toolsets, the entry point is through __start() in the crt0_gnu.asm
+   file, and that startup code will setup stacks and data */
+int main(void)
+{
+    return c_entry();
+}
+
+#ifdef  DEBUG
+/*******************************************************************************
+* @brief		Reports the name of the source file and the source line number
+* 				where the CHECK_PARAM error has occurred.
+* @param[in]	file Pointer to the source file name
+* @param[in]    line assert_param error line source number
+* @return		None
+*******************************************************************************/
+void check_failed(uint8_t *file, uint32_t line)
+{
+	/* User can add his own implementation to report the file name and line number,
+	 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
+
+	/* Infinite loop */
+	while(1);
+}
+#endif
+
+/*
+ * @}
+ */