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Hi, I am using 56F827 for my project. I want to generate pulse of 160Hz and width i.e. on time is 0.0015 seconds. To generate the required pulse I have initialized "qt_sState" structure In the following manner. 827 Freq is 80Mhz so peripheral freq is 40Mhz. // 160 Hz Pw = 0.0015 qt_sState quadParam3 = { /* Mode = */ qtVariableFreqPWM, /* InputSource = */ qtPrescalerDiv64, /* InputPolarity = */ qtNormal, /* SecondaryInputSource = */ 0, /* CountFrequency = */ qtRepeatedly, /* CountLength = */ qtUntilCompare, /* CountDirection = */ qtUp, /* OutputMode = */ qtToggleUsingAlternateCompare, /* OutputPolarity = */ qtNormal, /* OutputDisabled = */ 0, /* Master = */ 0, /* OutputOnMaster = */ 0, /* CoChannelInitialize = */ 0, /* AssertWhenForced = */ 0, /* CaptureMode = */ qtDisabled, /* CompareValue1 = Freq*/ 0x0b98, /* CompareValue2 = PW */ 0x03a9, /* InitialLoadValue = */ 0x0000, /* CallbackOnCompare = */ { CallbackOnCompare3, 0 }, /* CallbackOnOverflow = */ { 0, 0 }, /* CallbackOnInputEdge = */ { 0, 0 }, 0, //ComparatorValue2; 0, // ComparatorValue1; qtEnableCompareInterrupt, //InterruptEnable2 : 1; qtDisableCompareInterrupt, //InterruptEnable1 : 1; qtNeverPreLoad, //LoadControl2 : 2; qtNeverPreLoad // LoadControl1 : 2; }; I want to have interrupt after CMP2 comparison i.e. after on time completion for that I have initialized qtEnableCompareInterrupt. Corret me if I am wrong. But just sake of testing I have exchanged the enable flag but still it is generating the required interrupt after specific interval neither on nor off interval. How to configure quadtimer to get the interrupt after on / off time?Is there any other setting for the same? Thanks and Regards, Nitin |
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Quad timer initialization to generate interrupt on/off time (CMP1/CMP2)
Started by ●September 26, 2002
Reply by ●September 26, 20022002-09-26
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The Quad Timer "Compare" interrupt occurs for either CMP1 or CMP2
in this case. To get only the CMP2 interrupt, you could connect the Timer output pin to an edge-sensitive interrupt input (/IRQA, /IRQB, or one of the GPIO pins), and set it up for a Falling-edge sensitive interrupt. Regards, Art Johnson Senior Systems Analyst PMC Prime Mover Controls Inc. 3600 Gilmore Way Burnaby, B.C., Canada V5G 4R8 Phone: 604 433-4644 FAX: 604 433-5570 Email: http://www.pmc-controls.com -----Original Message----- From: Nitin Madhukar Yewale [mailto:] Sent: Thursday, September 26, 2002 3:38 AM To: Motoroladsp Subject: [motoroladsp] Quad timer initialization to generate interrupt on/off time (CMP1/CMP2) Hi, I am using 56F827 for my project. I want to generate pulse of 160Hz and width i.e. on time is 0.0015 seconds. To generate the required pulse I have initialized "qt_sState" structure In the following manner. 827 Freq is 80Mhz so peripheral freq is 40Mhz. // 160 Hz Pw = 0.0015 qt_sState quadParam3 = { /* Mode = */ qtVariableFreqPWM, /* InputSource = */ qtPrescalerDiv64, /* InputPolarity = */ qtNormal, /* SecondaryInputSource = */ 0, /* CountFrequency = */ qtRepeatedly, /* CountLength = */ qtUntilCompare, /* CountDirection = */ qtUp, /* OutputMode = */ qtToggleUsingAlternateCompare, /* OutputPolarity = */ qtNormal, /* OutputDisabled = */ 0, /* Master = */ 0, /* OutputOnMaster = */ 0, /* CoChannelInitialize = */ 0, /* AssertWhenForced = */ 0, /* CaptureMode = */ qtDisabled, /* CompareValue1 = Freq*/ 0x0b98, /* CompareValue2 = PW */ 0x03a9, /* InitialLoadValue = */ 0x0000, /* CallbackOnCompare = */ { CallbackOnCompare3, 0 }, /* CallbackOnOverflow = */ { 0, 0 }, /* CallbackOnInputEdge = */ { 0, 0 }, 0, //ComparatorValue2; 0, // ComparatorValue1; qtEnableCompareInterrupt, //InterruptEnable2 : 1; qtDisableCompareInterrupt, //InterruptEnable1 : 1; qtNeverPreLoad, //LoadControl2 : 2; qtNeverPreLoad // LoadControl1 : 2; }; I want to have interrupt after CMP2 comparison i.e. after on time completion for that I have initialized qtEnableCompareInterrupt. Corret me if I am wrong. But just sake of testing I have exchanged the enable flag but still it is generating the required interrupt after specific interval neither on nor off interval. How to configure quadtimer to get the interrupt after on / off time?Is there any other setting for the same? Thanks and Regards, Nitin _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/motoroladsp More Groups: http://www.dsprelated.com/groups.php3 ">http://docs.yahoo.com/info/terms/ |
