Diff: NVIC/Priority/nvic_priority.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/NVIC/Priority/nvic_priority.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,183 @@
+/***********************************************************************//**
+ * @file		nvic_priority.c
+ * @purpose		This example used to test NVIC Grouping Priority function
+ * @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_libcfg.h"
+#include "lpc17xx_gpio.h"
+#include "lpc17xx_nvic.h"
+#include "lpc17xx_systick.h"
+#include "lpc17xx_exti.h"
+#include "lpc17xx_pinsel.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup NVIC_Priority	Priority
+ * @ingroup NVIC_Examples
+ * @{
+ */
+
+/************************** PRIVATE DEFINTIONS*************************/
+/* Interrupt mode
+ * - 0: Tail-chaining interrupt
+ * - 1: Late-arriving interrupt
+ */
+#define INT_MODE	1
+
+/************************** PRIVATE FUNCTIONS *************************/
+void EINT0_IRQHandler(void);
+void EINT3_IRQHandler(void);
+
+void print_menu(void);
+void delay (void);
+
+/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
+/*********************************************************************//**
+ * @brief 		External interrupt 0 handler
+ * 				This interrupt occurs when pressing button INT0
+ * @param		None
+ * @return 		None
+ ***********************************************************************/
+void EINT0_IRQHandler(void)
+{
+	uint8_t i;
+	EXTI_ClearEXTIFlag(0);
+	for (i= 0; i<10; i++)
+	{
+		GPIO_SetValue(1,(1<<29));
+		delay();
+		GPIO_ClearValue(1,(1<<29));
+		delay();
+	}
+}
+
+/*********************************************************************//**
+ * @brief 		External interrupt 3 handler
+ * 				This interrupt occurs when turn ADC potentiometer
+ * @param		None
+ * @return 		None
+ ***********************************************************************/
+void EINT3_IRQHandler(void)
+{
+	uint8_t j;
+	if (GPIO_GetIntStatus(0, 25, 1))
+	{
+		 GPIO_ClearInt(0,(1<<25));
+		for (j= 0; j<10; j++)
+		{
+			GPIO_SetValue(1,(1<<28));
+			delay();
+			GPIO_ClearValue(1,(1<<28));
+			delay();
+		}
+	}
+}
+/*-------------------------PRIVATE FUNCTIONS------------------------------*/
+/*********************************************************************//**
+ * @brief		delay function
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void delay (void) {
+  unsigned int i;
+
+  for (i = 0; i < 0x400000; i++) {
+  }
+}
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry (void)
+{
+	EXTI_InitTypeDef EXTICfg;
+	PINSEL_CFG_Type PinCfg;
+
+	/* Configure:
+	 * 		+ LED1: P1.28
+	 * 		+ LED2: P1.29
+	 */
+	GPIO_SetDir(1, (1<<28)|(1<<29), 1);
+
+	/* Setting P2.10 as EINT0 */
+	PinCfg.Funcnum = 1;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Pinnum = 10;
+	PinCfg.Portnum = 2;
+	PINSEL_ConfigPin(&PinCfg);
+
+	/* Initialize External 0 interrupt */
+	EXTI_Init();
+	EXTICfg.EXTI_Line = EXTI_EINT0;
+	/* edge sensitive */
+	EXTICfg.EXTI_Mode = EXTI_MODE_EDGE_SENSITIVE;
+	EXTICfg.EXTI_polarity = EXTI_POLARITY_LOW_ACTIVE_OR_FALLING_EDGE;
+	EXTI_Config(&EXTICfg);
+
+
+#if (INT_MODE == 0) //same group, different sub-levels (Tail-chaining example)
+	NVIC_SetPriorityGrouping(4); //sets group priorities: 8 - subpriorities: 3
+	NVIC_SetPriority(EINT0_IRQn, 2);  //000:10 (bit 7:3)  assign eint0 to group 0, sub-priority 2 within group 0
+	NVIC_SetPriority(EINT3_IRQn, 1);  //000:01 (bit 7:3)  assign gpioint to group 0, sub-priority 1 within group 0
+#else //different group - (Late-arriving example)
+	NVIC_SetPriorityGrouping(4);  //sets group priorities: 8 - subpriorities: 3
+	NVIC_SetPriority(EINT0_IRQn, 0);   //000:00 (bit 7:3) assign eint0 to group 0, sub-priority 0 within group 0
+	NVIC_SetPriority(EINT3_IRQn, 4);   //001:00 (bit 7:3) assign GPIO int to group 1, sub-priority 0 within group 1
+#endif
+
+	NVIC_EnableIRQ(EINT0_IRQn);
+	NVIC_EnableIRQ(EINT3_IRQn);
+
+	//Enable GPIO interrupt  P0.25/AD0.2
+	GPIO_IntCmd(0,(1<<25),1);
+
+	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
+
+/*
+ * @}
+ */