These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
Diff: TIMER/FreqMeasure/freqmeasure.c
- Revision:
- 0:bf7b9fba3924
diff -r 000000000000 -r bf7b9fba3924 TIMER/FreqMeasure/freqmeasure.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TIMER/FreqMeasure/freqmeasure.c Sun Mar 20 05:38:56 2011 +0000 @@ -0,0 +1,244 @@ +/******************** (C) COPYRIGHT 2010 NXPSemiconductors ************ + * @file freqmeasure.c + * @purpose This example describes how to use TIMER capture function + * @version 1.0 + * @date 16. July. 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_timer.h" +#include "lpc17xx_libcfg.h" +#include "lpc17xx_pinsel.h" +#include "debug_frmwrk.h" + + +/* Example group ----------------------------------------------------------- */ +/** @defgroup TIMER_FreqMeasure FreqMeasure + * @ingroup TIMER_Examples + * @{ + */ + +/************************** PRIVATE VARIABLES *************************/ +uint8_t menu1[] = +"********************************************************************************\n\r" +"Hello NXP Semiconductors \n\r" +"Timer measure frequency demo \n\r" +"\t - MCU: LPC17xx \n\r" +"\t - Core: ARM Cortex-M3 \n\r" +"\t - Communicate via: UART0 - 115200 bps \n\r" +" Use timer 0 to measure input signal frequency through its CAP0.0 \n\r" +" Use timer 2 to generate different frequency signals \n\r" +"********************************************************************************\n\r"; + +TIM_TIMERCFG_Type TIM_ConfigStruct; +TIM_CAPTURECFG_Type TIM_CaptureConfigStruct; + +BOOL_8 first_capture,done; +uint32_t capture; +uint8_t count=0; +/************************** PRIVATE FUNCTIONS *************************/ +/* Interrupt service routines */ +void TIMER0_IRQHandler(void); + +void print_menu(void); +/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/ +/*********************************************************************//** + * @brief TIMER0 interrupt handler sub-routine + * @param[in] None + * @return None + **********************************************************************/ +void TIMER0_IRQHandler(void) +{ + if (TIM_GetIntCaptureStatus(LPC_TIM0,0)) + { + TIM_ClearIntCapturePending(LPC_TIM0,0); + if(first_capture==TRUE) + { + TIM_Cmd(LPC_TIM0,DISABLE); + TIM_ResetCounter(LPC_TIM0); + TIM_Cmd(LPC_TIM0,ENABLE); + count++; + if(count==5)first_capture=FALSE; //stable + } + else + { + count=0; //reset count for next use + done=TRUE; + capture = TIM_GetCaptureValue(LPC_TIM0,0); + } + } +} + +/*-------------------------PRIVATE FUNCTIONS------------------------------*/ +/*********************************************************************//** + * @brief Print menu + * @param[in] None + * @return None + **********************************************************************/ +void print_menu(void) +{ + _DBG(menu1); +} + + +/*-------------------------MAIN FUNCTION------------------------------*/ +/*********************************************************************//** + * @brief c_entry: Main TIMER program body + * @param[in] None + * @return int + **********************************************************************/ +int c_entry(void) +{ + PINSEL_CFG_Type PinCfg; + TIM_MATCHCFG_Type TIM_MatchConfigStruct; + uint8_t idx; + uint16_t tem; + uint32_t freq,temcap; + /* Initialize debug via UART0 + * 115200bps + * 8 data bit + * No parity + * 1 stop bit + * No flow control + */ + debug_frmwrk_init(); + + // print welcome screen + print_menu(); + + + //Config P1.26 as CAP0.0 + PinCfg.Funcnum = 3; + PinCfg.OpenDrain = 0; + PinCfg.Pinmode = 0; + PinCfg.Portnum = 1; + PinCfg.Pinnum = 26; + PINSEL_ConfigPin(&PinCfg); + // Configure P0.6 as MAT2.0 + PinCfg.Funcnum = 3; + PinCfg.OpenDrain = 0; + PinCfg.Pinmode = 0; + PinCfg.Portnum = 0; + PinCfg.Pinnum = 6; + PINSEL_ConfigPin(&PinCfg); + + while(1) + { + // Initialize timer 0, prescale count time of 1uS + TIM_ConfigStruct.PrescaleOption = TIM_PRESCALE_USVAL; + TIM_ConfigStruct.PrescaleValue = 1; + + // use channel 0, CAPn.0 + TIM_CaptureConfigStruct.CaptureChannel = 0; + // Enable capture on CAPn.0 rising edge + TIM_CaptureConfigStruct.RisingEdge = ENABLE; + // Enable capture on CAPn.0 falling edge + TIM_CaptureConfigStruct.FallingEdge = DISABLE; + // Generate capture interrupt + TIM_CaptureConfigStruct.IntOnCaption = ENABLE; + + // Set configuration for Tim_config and Tim_MatchConfig + TIM_Init(LPC_TIM0, TIM_TIMER_MODE,&TIM_ConfigStruct); + TIM_ConfigCapture(LPC_TIM0, &TIM_CaptureConfigStruct); + TIM_ResetCounter(LPC_TIM0); + /////////////////////////////////////////////////////////////////// + idx=0;freq=0;tem=0; + while(idx<3) + { + if(idx==0) + _DBG("\n\rPlease input frequency (from 1 to 999 hz):"); + tem = _DG; + switch(tem) + { + case '0':case'1':case '2':case '3':case '4':case '5':case '6':case '7':case'8':case '9': + tem = tem - 0x30; + idx++; + if(idx==1) tem = tem * 100; + else if (idx==2) tem = tem * 10; + freq = freq + tem; + if(idx==3)_DBD16(freq); + tem = 0; + break; + default: + _DBG("...Please input digits from 0 to 9 only!"); + idx = 0; tem = 0; freq = 0; + break; + } + } + TIM_ConfigStruct.PrescaleOption = TIM_PRESCALE_USVAL; + TIM_ConfigStruct.PrescaleValue = 1;//1us + TIM_Init(LPC_TIM2, TIM_TIMER_MODE,&TIM_ConfigStruct); + + // use channel 0, MR0 + TIM_MatchConfigStruct.MatchChannel = 0; + // Disable interrupt when MR0 matches the value in TC register + TIM_MatchConfigStruct.IntOnMatch = FALSE; + //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 MR0.0 pin if MR0 matches it + TIM_MatchConfigStruct.ExtMatchOutputType =TIM_EXTMATCH_TOGGLE; + // Set Match value + TIM_MatchConfigStruct.MatchValue = 500000/freq; + TIM_ConfigMatch(LPC_TIM2,&TIM_MatchConfigStruct); + + TIM_Cmd(LPC_TIM2,ENABLE); + ////////////////////////////////////////////////////////////////// + /* preemption = 1, sub-priority = 1 */ + NVIC_SetPriority(TIMER0_IRQn, ((0x01<<3)|0x01)); + /* Enable interrupt for timer 0 */ + NVIC_EnableIRQ(TIMER0_IRQn); + + first_capture = TRUE;done=FALSE;capture=0; + // To start timer 0 + TIM_Cmd(LPC_TIM0,ENABLE); + + _DBG("\n\rMeasuring......"); + while(done==FALSE); + temcap = 1000000 / capture;_DBD16(temcap);_DBG("hz"); + NVIC_DisableIRQ(TIMER0_IRQn); + TIM_DeInit(LPC_TIM0); + TIM_DeInit(LPC_TIM2); + _DBG("\n\rPress c to continue measuring other signals..."); + while(_DG != 'c'); + } + while (1); + return 1; +} + +/* Support required entry point for other toolchain */ +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 +/* + * @} + */