106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/*
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* This is an encapsulation of a National Instruments counter.
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*
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* It presents a simple 64-bit counter abstraction. When the counter is
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* created, it commences counting at zero until it is destroyed.
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*
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* The counter can be read and returns a 64-bit unsigned value.
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*/
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#ifndef _HWARE_H_
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#define _HWARE_H_
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#ifdef __cplusplus
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#else
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#include <stdbool.h>
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#endif
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struct device_private_t;
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typedef struct device_private_t* pHWARE;
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/**
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* Create a 64-bit counter and start it counting
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*
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* \param card_name the name of the device (e.g. "dev1/ctr0")
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* \param ptr address of pointer to opaque private data structure
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*
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* \return
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* 0 OK
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* !0 Error
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*/
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int hware_ctor(const char* card_name, pHWARE* ptr);
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/**
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* Read the value of the 64-bit counter
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*
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* \param hware pointer to opaque private data structure
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* \param value address of unsigned 64-bit value to receive the output
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*
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* \return
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* 0 OK
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* !0 Error
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*/
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int hware_read(pHWARE hware, unsigned long long* value);
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/**
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* Select the source
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*
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* \param value source selector
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* 3 Timebase 3 (80Mhz on PCI-6602)
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* 2 Timebase 2 (100Khz on PCI-6602)
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* 1 Timebase 1 (20Mhz on PCI-6602)
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* else default external pin
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*/
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int hware_source(pHWARE hware, int value);
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/**
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* Enables external output on designated DIO line
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*
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* \param hware pointer to opaque private data structure
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* \param value to be written to the associated line
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* < 0 disconnect
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* = 0 logic low
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* > 0 logic high
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*/
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int hware_outp(pHWARE hware, int value);
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/**
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* Enables external sync on designated (up/down) line
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*
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* \param hware pointer to opaque private data structure
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* \param external true for external sync, false for internal
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*/
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void hware_sync(pHWARE hware, bool external);
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/**
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* Destroy the 64-bit counter
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*
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* \param ptr address of pointer to opaque private data structure
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*
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* \return
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* 0 OK
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* !0 Error
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*/
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int hware_dtor(pHWARE* hware);
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/**
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* Tests returned error value to see if it represents failure
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*
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* \param error a value returned from another hware function
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*
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* \return
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* true the error was a failure
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* false the error was not a failure (warning)
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*/
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bool hware_failed(int error);
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/**
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* Retrieves a textual representation of the most recent error
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*
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* \param buff a pointer to the buffer to receive the text
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* \param len the length of the provided buffer
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*/
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void hware_errmsg(char* buff, int len);
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#endif
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