Diff: RTC/Calibration/rtc_calib.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/RTC/Calibration/rtc_calib.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,168 @@
+/***********************************************************************//**
+ * @file		rtc_calib.c
+ * @purpose		This example describes how to calibrate real time clock.
+ * @version		2.0
+ * @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_rtc.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup RTC_Calibration	Calibration
+ * @ingroup RTC_Examples
+ * @{
+ */
+
+
+/************************** PRIVATE VARIABLES *************************/
+uint8_t menu[]=
+	"********************************************************************************\n\r"
+	"Hello NXP Semiconductors \n\r"
+	"RTC Calibration 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 describes how to calibrate RTC \n\r"
+	"********************************************************************************\n\r";
+
+/************************** PRIVATE FUNCTIONS *************************/
+void print_menu(void);
+void RTC_IRQHandle(void);
+
+/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
+/*********************************************************************//**
+ * @brief		RTC interrupt handler sub-routine
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void RTC_IRQHandler(void)
+{
+	uint32_t secval;
+
+	/* This is increment counter interrupt*/
+	if (RTC_GetIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE))
+	{
+		secval = RTC_GetTime (LPC_RTC, RTC_TIMETYPE_SECOND);
+
+		/* Send debug information */
+		_DBG ("Second: "); _DBD(secval);
+		_DBG_("");
+
+		// Clear pending interrupt
+		RTC_ClearIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE);
+	}
+}
+
+/*-------------------------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)
+{
+	/* Initialize debug via UART0
+	 * – 115200bps
+	 * – 8 data bit
+	 * – No parity
+	 * – 1 stop bit
+	 * – No flow control
+	 */
+	debug_frmwrk_init();
+
+	// print welcome screen
+	print_menu();
+
+	/* In this example:
+	 * Suppose that the RTC need periodically adjust after each 5 second.
+	 * And the time counter need by incrementing the counter by 2 instead of 1
+	 * We will observe timer counter after calibration via serial display
+	 */
+	// Init RTC module
+	RTC_Init(LPC_RTC);
+
+	/* Enable rtc (starts increase the tick counter and second counter register) */
+	RTC_ResetClockTickCounter(LPC_RTC);
+	RTC_Cmd(LPC_RTC, ENABLE);
+
+	//Set current time = 0
+	RTC_SetTime (LPC_RTC, RTC_TIMETYPE_SECOND, 0);
+
+	/* Setting Timer calibration
+	 * Calibration value =  5s;
+	 * Direction = Forward calibration
+	 * So after each 5s, calibration logic can periodically adjust the time counter by
+	 * incrementing the counter by 2 instead of 1
+	 */
+	RTC_CalibConfig(LPC_RTC, 5, RTC_CALIB_DIR_FORWARD);
+	RTC_CalibCounterCmd(LPC_RTC, ENABLE);
+
+	/* Set the CIIR for second counter interrupt*/
+	RTC_CntIncrIntConfig (LPC_RTC, RTC_TIMETYPE_SECOND, ENABLE);
+
+    /* Enable RTC interrupt */
+    NVIC_EnableIRQ(RTC_IRQn);
+
+    /* Loop forever */
+    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
+
+/*
+ * @}
+ */