AIO.rar_aio

/* ********************************************************************************************************* * Analog I/O Module * * (c) Copyright 1999, Jean J. Labrosse, Weston, FL * All Rights Reserved * * Filename : AIO.C * Programmer : Jean J. Labrosse ********************************************************************************************************* */ /* ********************************************************************************************************* * INCLUDE FILES ********************************************************************************************************* */ #define AIO_GLOBALS #include "ucos_ii.h" #include "AIO.h" /* ********************************************************************************************************* * LOCAL VARIABLES ********************************************************************************************************* */ static OS_STK AIOTaskStk[AIO_TASK_STK_SIZE]; static OS_EVENT *AIOSem; /* ********************************************************************************************************* * LOCAL FUNCTION PROTOTYPES ********************************************************************************************************* */ void AIOTask(void *data); static void AIInit(void); static void AIUpdate(void); static void AOInit(void); static void AOUpdate(void); /*$PAGE*/ /* ********************************************************************************************************* * CONFIGURE THE CALIBRATION PARAMETERS OF AN ANALOG INPUT CHANNEL * * Description : This function is used to configure an analog input channel. * Arguments : n is the analog input channel to configure: * gain is the calibration gain * offset is the calibration offset * Returns : 0 if successfull. * 1 if you specified an invalid analog input channel number. ********************************************************************************************************* */ INT8U AICfgCal (INT8U n, FP32 gain, FP32 offset) { INT8U err; AIO *paio; if (n < AIO_MAX_AI) { paio = &AITbl[n]; /* Point to Analog Input structure */ OSSemPend(AIOSem, 0, &err); /* Obtain exclusive access to AI channel */ paio->AIOCalGain = gain; /* Store new cal. gain and offset into struct */ paio->AIOCalOffset = offset; paio->AIOGain = paio->AIOCalGain * paio->AIOConvGain; /* Compute overall gain */ paio->AIOOffset = paio->AIOCalOffset + paio->AIOConvOffset; /* Compute overall offset */ OSSemPost(AIOSem); /* Release AI channel */ return (0); } else { return (1); } } /*$PAGE*/ /* ********************************************************************************************************* * CONFIGURE THE CONVERSION PARAMETERS OF AN ANALOG INPUT CHANNEL * * Description : This function is used to configure an analog input channel. * Arguments : n is the analog channel to configure (0..AIO_MAX_AI-1). * gain is the conversion gain * offset is the conversion offset * pass is the value for the pass counts * Returns : 0 if successfull. * 1 if you specified an invalid analog input channel number. ********************************************************************************************************* */ INT8U AICfgConv (INT8U n, FP32 gain, FP32 offset, INT8U pass) { INT8U err; AIO *paio; if (n < AIO_MAX_AI) { paio = &AITbl[n]; /* Point to Analog Input structure */ OSSemPend(AIOSem, 0, &err); /* Obtain exclusive access to AI channel */ paio->AIOConvGain = gain; /* Store new conv. gain and offset into struct */ paio->AIOConvOffset = offset; paio->AIOGain = paio->AIOCalGain * paio->AIOConvGain; /* Compute overall gain */ paio->AIOOffset = paio->AIOCalOffset + paio->AIOConvOffset; /* Compute overall offset */ paio->AIOPassCnts = pass; OSSemPost(AIOSem); /* Release AI channel */ return (0); } else { return (1); } } /*$PAGE*/ /* ********************************************************************************************************* * CONFIGURE THE SCALING PARAMETERS OF AN ANALOG INPUT CHANNEL * * Description : This function is used to configure the scaling parameters associated with an analog * input channel. * Arguments : n is the analog input channel to configure (0..AIO_MAX_AI-1). * arg is a pointer to arguments needed by the scaling function * fnct is a pointer to a scaling function * Returns : 0 if successfull. * 1 if you specified an invalid analog input channel number. ********************************************************************************************************* */ INT8U AICfgScaling (INT8U n, void (*fnct)(AIO *paio), void *arg) { AIO *paio; #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */ OS_CPU_SR cpu_sr = 0; #endif if (n < AIO_MAX_AI) { paio = &AITbl[n]; /* Faster to use a pointer to the structure */ OS_ENTER_CRITICAL(); paio->AIOScaleFnct = (void (*)())fnct; paio->AIOScaleFnctArg = arg; OS_EXIT_CRITICAL(); return (0); } else { return (1); } } /*$PAGE*/ /* ********************************************************************************************************* * GET THE VALUE OF AN ANALOG INPUT CHANNEL * * Description : This function is used to get the currect value of an analog input channel (in engineering * units). * Arguments : n is the analog input channel (0..AIO_MAX_AI-1). * pval is a pointer to the destination engineering units of the analog input channel * Returns : 0 if successfull. * 1 if you specified an invalid analog input channel number. * In this case, the destination is not changed. ********************************************************************************************************* */ INT8U AIGet (INT8U n, FP32 *pval) { AIO *paio; #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */ OS_CPU_SR cpu_sr = 0; #endif if (n < AIO_MAX_AI) { paio = &AITbl[n]; OS_ENTER_CRITICAL(); /* Obtain exclusive access to AI channel */ *pval = paio->AIOEU; /* Get the engineering units of the analog input channel */ OS_EXIT_CRITICAL(); /* Release AI channel */ return (0); } else { return (1); } } /*$PAGE*/ /* ********************************************************************************************************* *