Diff: TIMER/PWMSignal/pwm_signal.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TIMER/PWMSignal/pwm_signal.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,294 @@
+/***********************************************************************//**
+ * @file		pwm_signal.c
+ * @purpose		This example use TIMERs to generate 4 PWM signals with
+ * 				different duty cycle
+ * @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_libcfg.h"
+#include "debug_frmwrk.h"
+#include "lpc17xx_gpio.h"
+#include "lpc17xx_pinsel.h"
+#include "lpc17xx_timer.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup TIMER_PWMSignal	PWMSignal
+ * @ingroup TIMER_Examples
+ * @{
+ */
+
+/************************** PRIVATE VARIABLES *************************/
+uint8_t menu[]=
+	"********************************************************************************\n\r"
+	"Hello NXP Semiconductors \n\r"
+	"System Tick 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 TIMERs to generate 4 PWM signals with different duty cycles \n\r"
+	"********************************************************************************\n\r";
+FunctionalState	PWM0_State = ENABLE;
+FunctionalState	PWM1_State = ENABLE;
+FunctionalState	PWM2_State = ENABLE;
+FunctionalState	PWM3_State = ENABLE;
+
+TIM_TIMERCFG_Type TIM_ConfigStruct;
+TIM_MATCHCFG_Type TIM_MatchConfigStruct;
+
+/************************** PRIVATE FUNCTIONS *************************/
+void TIMER0_IRQHandler(void);
+void TIMER1_IRQHandler(void);
+void TIMER2_IRQHandler(void);
+void TIMER3_IRQHandler(void);
+
+void print_menu(void);
+
+/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
+/*********************************************************************//**
+ * @brief 		TIMER0 interrupt handler
+ * @param		None
+ * @return 		None
+ ***********************************************************************/
+void TIMER0_IRQHandler(void)
+{
+	//duty cycle = 12.5%
+	TIM_Cmd(LPC_TIM0,DISABLE);
+	TIM_ClearIntPending(LPC_TIM0, TIM_MR0_INT);
+	TIM_ResetCounter(LPC_TIM0);
+	if((PWM0_State == ENABLE))
+	{
+		TIM_UpdateMatchValue(LPC_TIM0, 0, 100);
+		PWM0_State = DISABLE;
+	}
+	else
+	{
+		TIM_UpdateMatchValue(LPC_TIM0, 0, 700);
+		PWM0_State = ENABLE;
+	}
+	TIM_Cmd(LPC_TIM0,ENABLE);
+}
+
+/*********************************************************************//**
+ * @brief 		TIMER1 interrupt handler
+ * @param		None
+ * @return 		None
+ ***********************************************************************/
+void TIMER1_IRQHandler(void)
+{
+	//duty cycle = 25%
+	TIM_Cmd(LPC_TIM1,DISABLE);
+	TIM_ClearIntPending(LPC_TIM1, TIM_MR0_INT);
+	TIM_ResetCounter(LPC_TIM1);
+	if((PWM1_State == ENABLE))
+	{
+		TIM_UpdateMatchValue(LPC_TIM1,0, 200);
+		PWM1_State = DISABLE;
+	}
+	else
+	{
+		TIM_UpdateMatchValue(LPC_TIM1,0, 600);
+		PWM1_State = ENABLE;
+	}
+	TIM_Cmd(LPC_TIM1,ENABLE);
+}
+
+/*********************************************************************//**
+ * @brief 		TIMER2 interrupt handler
+ * @param		None
+ * @return 		None
+ ***********************************************************************/
+void TIMER2_IRQHandler(void)
+{
+	//duty cycle = 37,5%
+	TIM_Cmd(LPC_TIM2,DISABLE);
+	TIM_ClearIntPending(LPC_TIM2, TIM_MR0_INT);
+	TIM_ResetCounter(LPC_TIM2);
+	if((PWM2_State == ENABLE))
+	{
+		TIM_UpdateMatchValue(LPC_TIM2,0, 300);
+		PWM2_State = DISABLE;
+	}
+	else
+	{
+		TIM_UpdateMatchValue(LPC_TIM2,0, 500);
+		PWM2_State = ENABLE;
+	}
+	TIM_Cmd(LPC_TIM2,ENABLE);
+}
+
+/*********************************************************************//**
+ * @brief 		TIMER3 interrupt handler
+ * @param		None
+ * @return 		None
+ ***********************************************************************/
+void TIMER3_IRQHandler(void)
+{
+	//duty cycle = 50%
+	TIM_Cmd(LPC_TIM3,DISABLE);
+	TIM_ClearIntPending(LPC_TIM3, TIM_MR0_INT);
+	TIM_ResetCounter(LPC_TIM3);
+	TIM_Cmd(LPC_TIM3,ENABLE);
+}
+
+
+/*-------------------------PRIVATE FUNCTIONS------------------------------*/
+/*********************************************************************//**
+ * @brief		Print Welcome menu
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void print_menu(void)
+{
+	_DBG(menu);
+}
+
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main TIMER 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();
+
+	/* Select pin:
+	 * P1.28: MAT0.0
+	 * P1.22: MAT1.0
+	 * P0.6:  MAT2.0
+	 * P0.10: MAT3.0
+	 */
+	PinCfg.Funcnum = 3;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Portnum = 1;
+	PinCfg.Pinnum = 28;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 22;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Portnum = 0;
+	PinCfg.Pinnum = 6;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 10;
+	PINSEL_ConfigPin(&PinCfg);
+
+	// Initialize 4 timers, prescale count time of 100uS
+	TIM_ConfigStruct.PrescaleOption = TIM_PRESCALE_USVAL;
+	TIM_ConfigStruct.PrescaleValue	= 100;
+
+	TIM_Init(LPC_TIM0, TIM_TIMER_MODE,&TIM_ConfigStruct);
+	TIM_Init(LPC_TIM1, TIM_TIMER_MODE,&TIM_ConfigStruct);
+	TIM_Init(LPC_TIM2, TIM_TIMER_MODE,&TIM_ConfigStruct);
+	TIM_Init(LPC_TIM3, TIM_TIMER_MODE,&TIM_ConfigStruct);
+
+	// Configure 4 match channels
+	// use channel 0, MR0
+	TIM_MatchConfigStruct.MatchChannel = 0;
+	// Enable interrupt when MR0 matches the value in TC register
+	TIM_MatchConfigStruct.IntOnMatch   = TRUE;
+	//Enable reset on MR0: TIMER will reset if MR0 matches it
+	TIM_MatchConfigStruct.ResetOnMatch = TRUE;
+	//Stop on MR0 if MR0 matches it
+	TIM_MatchConfigStruct.StopOnMatch  = FALSE;
+	//Toggle MR0 pin if MR0 matches it
+	TIM_MatchConfigStruct.ExtMatchOutputType = TIM_EXTMATCH_TOGGLE;
+	// Set Match value
+	TIM_MatchConfigStruct.MatchValue   = 700;
+	// Set configuration for Tim_MatchConfig
+	TIM_ConfigMatch(LPC_TIM0,&TIM_MatchConfigStruct);
+	TIM_MatchConfigStruct.MatchValue   = 600;
+	TIM_ConfigMatch(LPC_TIM1,&TIM_MatchConfigStruct);
+	TIM_MatchConfigStruct.MatchValue   = 500;
+	TIM_ConfigMatch(LPC_TIM2,&TIM_MatchConfigStruct);
+	TIM_MatchConfigStruct.MatchValue   = 800;
+	TIM_ConfigMatch(LPC_TIM3,&TIM_MatchConfigStruct);
+
+	/* preemption = 1, sub-priority = 1 */
+	NVIC_SetPriority(TIMER0_IRQn, ((0x01<<3)|0x01));
+	/* Enable interrupt for timer 0 */
+	NVIC_EnableIRQ(TIMER0_IRQn);
+	// To start timer 0
+	TIM_Cmd(LPC_TIM0,ENABLE);
+
+	/* preemption = 1, sub-priority = 1 */
+	NVIC_SetPriority(TIMER1_IRQn, ((0x01<<3)|0x02));
+	/* Enable interrupt for timer 1 */
+	NVIC_EnableIRQ(TIMER1_IRQn);
+	// To start timer 1
+	TIM_Cmd(LPC_TIM1,ENABLE);
+
+	/* preemption = 1, sub-priority = 1 */
+	NVIC_SetPriority(TIMER2_IRQn, ((0x01<<3)|0x03));
+	/* Enable interrupt for timer 1 */
+	NVIC_EnableIRQ(TIMER2_IRQn);
+	// To start timer 1
+	TIM_Cmd(LPC_TIM2,ENABLE);
+
+	/* preemption = 1, sub-priority = 1 */
+	NVIC_SetPriority(TIMER3_IRQn, ((0x01<<3)|0x04));
+	/* Enable interrupt for timer 1 */
+	NVIC_EnableIRQ(TIMER3_IRQn);
+	// To start timer 1
+	TIM_Cmd(LPC_TIM3,ENABLE);
+
+	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
+
+/*
+ * @}
+ */