Part Number: TMDSHVMTRPFCKIT
Dear TI Hello,
I am trying to calculate the timeout between two rising edges using the eCAP module,
I want to measure speed using the eCAP,
I am using the f2803xcap.h,
/* ==================================================================================
File name: F2803XCAP.H
Target : F2803x family
=====================================================================================*/
#ifndef __F280X_CAP_H__
#define __F280X_CAP_H__
#include "f2803xbmsk.h"
#include "f2803xdrvlib.h"
/*-----------------------------------------------------------------------------
Initialization states for ECAP Control Registers 1 and 2 for ECAP1
------------------------------------------------------------------------------*/
#define ECCTL1_INIT_STATE ( CAP1POL_RISING_EDGE + \
CAPLDEN_ENABLE + \
CTRRST1_DIFFERENCE_TS + \
EVTFLTPS_X_1 + \
EMULATION_FREE )
#define ECCTL2_INIT_STATE ( CONTINUOUS_MODE + \
TSCNTSTP_FREE + \
SYNCI_DISABLE + \
SYNCO_DISABLE + \
CAPTURE_MODE )
/*-----------------------------------------------------------------------------
Define the structure of the Capture Driver Object
------------------------------------------------------------------------------*/
typedef struct { int32 EventPeriod; // Output: Timer value difference between two edges detected (Q0)
Uint16 CapReturn;
} CAPTURE;
/*------------------------------------------------------------------------------
Default Initializer for the F280X CAPTURE Object
------------------------------------------------------------------------------*/
#define F280XCAP1 {1,0 \
}
/*------------------------------------------------------------------------------
Target Independent Default Initializer CAPTURE Object
------------------------------------------------------------------------------*/
#define CAPTURE_DEFAULTS F280XCAP1
/*------------------------------------------------------------------------------
CAP_INIT & CAP Macro Definitions
------------------------------------------------------------------------------*/
#define CAP_INIT_MACRO(n) \
/* Init ECAP Control Registers 1 and 2 for ECAP1*/ \
(*eCAP[n]).ECCTL1.all = ECCTL1_INIT_STATE; \
(*eCAP[n]).ECCTL2.all = ECCTL2_INIT_STATE; \
//Make sure that the GPIO configuration is properly done in ...-DevInit_F2803x.c file as shown below\ \
EALLOW; /* Enable EALLOW */ \
/* Set up the ECAP1 pin to primary function*/ \
GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 1; /* GPIO24 is ECAP1 */ \
EDIS; /* Disable EALLOW */
#define CAP_MACRO(n,v) \
if((*eCAP[n]).ECFLG.bit.CEVT1 != 0)/* Check status of one entry of first event of ECAP1 pin */ \
{ \
v.EventPeriod = (*eCAP[n]).CAP1; /* Stamp the timer counter difference between two edges detected*/\
v.CapReturn=0; /* Then, return zero*/ \
} \
else \
{ \
v.CapReturn=1; /* Else, return one */ \
}
#endif // __F280X_CAP_H__
In this line of code:
v.EventPeriod = (*eCAP[n]).CAP1; /* Stamp the timer counter difference between two edges detected*/\
eCAP should return the period, which means the timeout between two rising edges,
Could someone please help me to configure the eCAP so it could take two rising edges?
Best Regards,
S.Tarik,
