Hi, I am using 56F827 for my project. I want to know about Quad timer. I have configured the Quad timer for PWM generation. Please find the declaration for the same. I am using Quad Timer1 for testing but not able to see waveform using CRO probe. //10 Hz pw = 0.000025 qt_sState quadParam1 = { /* 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 = */ 0x000f, // Off Time /* CompareValue2 = */ 0xf414, // On Time /* InitialLoadValue = */ 0x0000, /* CallbackOnCompare = */ { CallbackOnQ1, 0 }, /* CallbackOnOverflow = */ { 0, 0 }, /* CallbackOnInputEdge = */ { 0, 0 } }; Can anybody help me on this issue? Thanks and Regards, Nitin Yewale, Wipro Technologies, Plot No 2, MIDC, Pune Infotech Park, Hinjewadi, Pune - 411 027 India. Ph. 91-20-2933700 Extn :2074 Email : URL : http://www.wipro.com |
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PWM generation using Quad timer of 827
Started by ●September 12, 2002
Reply by ●September 12, 20022002-09-12
The "OutputDisabled" value needs to be set to 1 (True) to enable
the output. This is kind of "reverse" logic, the parameter probably should have been called "OutputEnabled" instead, to reflect its true purpose. Also, the qt_sState structure you have shown is for the 56F826 chip, the 56F827 structure has additional parameters as shown in Section 5.4.3 of the on-line documentation: Quad Timer Driver MOTOROLA 5-45 5.4.3 API Definition This section defines the Application Programming Interface (API) by identifying all public interface functions and data structures. Code to create and initialize the Quad Timer driver may automatically be included in an SDK Embedded Project by inserting the following line in the appconfig.h file: #define INCLUDE_QUAD_TIMER The following information may be found in the public header file quadraturetimer.h: Public Interface Function(s): /*********************************************************************** ****** * int open(const char *pName, int OFlags,...); * int close(int FileDesc); * UWord16 ioctl(int FileDesc, UWord16 Cmd, void * pParams); * UWord16 qtIoctl(int FileDesc, UWord16 Cmd, void * pParams, * void * bspDeviceName); ************************************************************************ *****/ Public Data Structure(s): typedef struct { qt_eMode Mode; qt_eInputSource InputSource; qt_ePolarity InputPolarity; qt_eSecondaryInputSource SecondaryInputSource; qt_eCountFrequency CountFrequency; qt_eCountLength CountLength; qt_eCountDirection CountDirection; qt_eOutputMode OutputMode; qt_ePolarity OutputPolarity; bool OutputDisabled; bool Master; bool OutputOnMaster; bool CoChannelInitialize; bool AssertWhenForced; qt_eCaptureMode CaptureMode; UInt16 CompareValue1; UInt16 CompareValue2; UInt16 InitialLoadValue; qt_sCallback CallbackOnCompare; qt_sCallback CallbackOnOverflow; qt_sCallback CallbackOnInputEdge; UInt16 ComparatorValue2; /* 827 only */ UInt16 ComparatorValue1; /* 827 only */ qt_eTimerCompareIntEnable InterruptEnable2; /* 827 only */ qt_eTimerCompareIntEnable InterruptEnable1; /* 827 only */ qt_eCompareLoadControl LoadControl2; /* 827 only */ qt_eCompareLoadControl LoadControl1; /* 827 only */ }qt_sState; There is documentation for the Quad Timer Driver in the on-line manual, start it as follows: Start Programs Motorola Embedded SDK 2.5 Help and Documentation In "Contents", go to: Motorola Embedded SDK Software Solutions Targeting DSP568xx Platforms DSP56826/827 Platform 5 On-Chip Drivers 5.4 Quad Timer Driver 5.4.1 Introduction 5.4.2 Initialization 5.4.3 API Definition 5.4.4 API Specifications 5.4.5 Quad Timer Driver Application Also look at Code Example 5-9 in Section 5.4.4.3, "Quad Timer Driver Usage for DSP56F827". I hope this helps. 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 12, 2002 2:58 AM To: Subject: [motoroladsp] PWM generation using Quad timer of 827 Hi, I am using 56F827 for my project. I want to know about Quad timer. I have configured the Quad timer for PWM generation. Please find the declaration for the same. I am using Quad Timer1 for testing but not able to see waveform using CRO probe. //10 Hz pw = 0.000025 qt_sState quadParam1 = { /* 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 = */ 0x000f, // Off Time /* CompareValue2 = */ 0xf414, // On Time /* InitialLoadValue = */ 0x0000, /* CallbackOnCompare = */ { CallbackOnQ1, 0 }, /* CallbackOnOverflow = */ { 0, 0 }, /* CallbackOnInputEdge = */ { 0, 0 } }; Can anybody help me on this issue? Thanks and Regards, Nitin Yewale, Wipro Technologies, Plot No 2, MIDC, Pune Infotech Park, Hinjewadi, Pune - 411 027 India. Ph. 91-20-2933700 Extn :2074 Email : URL : http://www.wipro.com _____________________________________ 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/ |
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Reply by ●September 14, 20022002-09-14
Hi I use the Timer Structure quite a bit and when OutputDisabled is 1, True, the output is actually disabled. A 0, False, enables the output. Pete --- In motoroladsp@y..., "Art Johnson" <art@p...> wrote: > The "OutputDisabled" value needs to be set to 1 (True) to enable the > output. This is kind of "reverse" logic, the parameter probably should > have been called "OutputEnabled" instead, to reflect its true purpose. > |
Reply by ●September 16, 20022002-09-16
Thanks for this information. This means that the SDK documentation is incorrect, both in Table 5-26 "Quad Timer Data Structure Members", and in the examples 5-6 "qt_sState Data Structure for DSP56F826" and 5-7 "qt_sState Data Structure for DSP56F827". In Table 5-26 it has the following: Parameter: OutputDisabled Type: bool Description: Enable (True)/disable (False) output Quad Timer Register Reference: Output enable of status and control register We wrote our own drivers for all of the on-chip I/O and we use them exclusively, so I was going by the on-line documentation for the operation of the SDK Quad Timer Driver. Art Johnson -----Original Message----- From: Pete Becher [mailto:] Sent: Saturday, September 14, 2002 12:47 PM To: Subject: [motoroladsp] Re: PWM generation using Quad timer of 827 Hi I use the Timer Structure quite a bit and when OutputDisabled is 1, True, the output is actually disabled. A 0, False, enables the output. Pete --- In motoroladsp@y..., "Art Johnson" <art@p...> wrote: > The "OutputDisabled" value needs to be set to 1 (True) to enable the > output. This is kind of "reverse" logic, the parameter probably should > have been called "OutputEnabled" instead, to reflect its true purpose. > _____________________________________ 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/ |