Diff: PWM/Match_Interrupt/pwm_match_int.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PWM/Match_Interrupt/pwm_match_int.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,205 @@
+/***********************************************************************//**
+ * @file		pwm_match_int.c
+ * @purpose		PWM match interrupt example
+ * @version		2.0
+ * @date		21. May. 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_pwm.h"
+#include "lpc17xx_libcfg.h"
+#include "lpc17xx_pinsel.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup PWM_Match_Interrupt	Match_Interrupt
+ * @ingroup PWM_Examples
+ * @{
+ */
+
+/************************** PRIVATE DEFINITIONS *************************/
+// Time out definition - used in blocking mode in read/write function
+#define TIME_OUT	10000
+
+
+/************************** PRIVATE VARIABLES *************************/
+__IO uint32_t match_cnt = 0;
+__IO uint32_t long_duty = 0;
+
+/************************** PRIVATE FUNCTIONS *************************/
+/* Interrupt service routine */
+void PWM1_IRQHandler(void);
+
+/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
+/*********************************************************************//**
+ * @brief		GPDMA interrupt handler sub-routine
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void PWM1_IRQHandler(void)
+{
+	/* Check whether if match flag for channel 0 is set or not */
+	if (PWM_GetIntStatus(LPC_PWM1, PWM_INTSTAT_MR0))
+	{
+		match_cnt++;
+		/* Clear the interrupt flag */
+		PWM_ClearIntPending(LPC_PWM1, PWM_INTSTAT_MR0);
+	}
+}
+
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main PWM program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry(void)
+{
+	uint8_t temp, temp2;
+	PWM_TIMERCFG_Type PWMCfgDat;
+	PWM_MATCHCFG_Type PWMMatchCfgDat;
+	PINSEL_CFG_Type PinCfg;
+
+	/* PWM block section -------------------------------------------- */
+	/* Initialize PWM peripheral, timer mode
+	 * PWM prescale value = 1 (absolute value - tick value) */
+	PWMCfgDat.PrescaleOption = PWM_TIMER_PRESCALE_TICKVAL;
+	PWMCfgDat.PrescaleValue = 1;
+	PWM_Init(LPC_PWM1, PWM_MODE_TIMER, (void *) &PWMCfgDat);
+
+	/*
+	 * Initialize PWM pin connect
+	 */
+	PinCfg.Funcnum = 1;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Portnum = 2;
+	for (temp = 0; temp <= 6; temp++){
+		PinCfg.Pinnum = temp;
+		PINSEL_ConfigPin(&PinCfg);
+	}
+
+
+	/* Set match value for PWM match channel 0 = 256, update immediately */
+	PWM_MatchUpdate(LPC_PWM1, 0, 256, PWM_MATCH_UPDATE_NOW);
+	/* PWM Timer/Counter will be reset when channel 0 matching
+	 * Enable interrupt when match
+	 * no stop when match */
+	PWMMatchCfgDat.IntOnMatch = ENABLE;
+	PWMMatchCfgDat.MatchChannel = 0;
+	PWMMatchCfgDat.ResetOnMatch = ENABLE;
+	PWMMatchCfgDat.StopOnMatch = DISABLE;
+	PWM_ConfigMatch(LPC_PWM1, &PWMMatchCfgDat);
+
+	/* Configure each PWM channel: --------------------------------------------- */
+	/* - Single edge
+	 * - PWM Duty on each PWM channel determined by
+	 * the match on channel 0 to the match of that match channel.
+	 * Example: PWM Duty on PWM channel 1 determined by
+	 * the match on channel 0 to the match of match channel 1.
+	 */
+
+	/* Configure PWM channel edge option
+	 * Note: PWM Channel 1 is in single mode as default state and
+	 * can not be changed to double edge mode */
+	for (temp = 2; temp < 7; temp++)
+	{
+		PWM_ChannelConfig(LPC_PWM1, temp, PWM_CHANNEL_SINGLE_EDGE);
+	}
+
+	/* Setting interrupt for PWM ---------------------------------------------- */
+    /* Disable PWM interrupt */
+    NVIC_DisableIRQ(PWM1_IRQn);
+    /* preemption = 1, sub-priority = 1 */
+    NVIC_SetPriority(PWM1_IRQn, ((0x01<<3)|0x01));
+
+	/* Configure match value for each match channel */
+	temp2 = 10;
+	for (temp = 1; temp < 7; temp++)
+	{
+		/* Set up match value */
+		PWM_MatchUpdate(LPC_PWM1, temp, temp2, PWM_MATCH_UPDATE_NOW);
+		/* Configure match option */
+		PWMMatchCfgDat.IntOnMatch = DISABLE;
+		PWMMatchCfgDat.MatchChannel = temp;
+		PWMMatchCfgDat.ResetOnMatch = DISABLE;
+		PWMMatchCfgDat.StopOnMatch = DISABLE;
+		PWM_ConfigMatch(LPC_PWM1, &PWMMatchCfgDat);
+		/* Enable PWM Channel Output */
+		PWM_ChannelCmd(LPC_PWM1, temp, ENABLE);
+		/* Increase match value by 10 */
+		temp2 += 10;
+	}
+
+    /* Enable PWM interrupt */
+    NVIC_EnableIRQ(PWM1_IRQn);
+
+	/* Reset and Start counter */
+	PWM_ResetCounter(LPC_PWM1);
+	PWM_CounterCmd(LPC_PWM1, ENABLE);
+
+	/* Start PWM now */
+	PWM_Cmd(LPC_PWM1, ENABLE);
+
+	// Update PWM1.1 every 0x1000 match interrupt
+	while (1)
+	{
+		if (match_cnt >= 0x1000) {
+			match_cnt = 0;
+			long_duty++;
+			if (long_duty >= 256) {
+				// Reset duty
+				long_duty = 0;
+				// Print info
+				//UART_Puts_(uartdev, "PWM1.1 is reset!");
+			}
+
+			// Update PWM1.1 duty
+			PWM_MatchUpdate(LPC_PWM1, 1, long_duty, PWM_MATCH_UPDATE_NOW);
+		}
+	}
+    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
+
+/*
+ * @}
+ */