I need support for solve a problem of syncronizzation between PWM and ADC.
In my application I use the DSP MC56F84763 and the PWM signal are generated according the center alligned method.
In my case the I can not use VAL0 register for to generate the synch between PWM and ADC.
On application note (AN4583) I have read that other method is to use a delay timer plus timer A3
This is my problem:
the synchronization work properly but in two case the point of synchronization is moved:
1) When I use the jtag for debug operation, the point of synchronization is different and is moved when a breakpoint is reached.
2) When I modify the code the inizialization timing is modified and the poind of synchronization is changed.
I need support for solve this problems!!!
reading this application note I write the following code:
//synch between delay timer PDB0 and Timer TA3
XBARA_SEL19 = 0x00<<CODE_1 | 0x27<<CODE_0;
//synch between Timer TA3 and ADC
XBARA_SEL6 = 0x00<<CODE_1 | 0x1C<<CODE_0;
//Timer A3 configuration
TMRA_3_COMP1 = 0x0032; //Set Compare register 1
TMRA_3_CMPLD1 = 0;
TMRA_3_COMP2 = 0x186a - TMRA_3_COMP1 - 1; //Set Compare register 2
TMRA_3_CMPLD2 = 0;
TMRA_3_CNTR = 0;
TMRA_3_CTRL = 0b110<<CM | 0b1000<<PCS | 0b11<<SCS | 0<<ONCE | 1<<LENGTH | 0<<DIR | 0<<CO_INIT | 0b100<<OM;
TMRA_3_SCTRL = 0<<TCF | 0<<TCFIE | 0<<TOF | 0<<TOFIE | 0<<IEF | 0<<IEFIE | 0<<IPS | 0<<INPUT | 0b00<<CAPT_MODE | 0<<MSTR | 0<<EEOF | 0<<VAL | 0<<FORCE | 0<<OPS | 1<<OEN;
//delay PDB0 (the signal synchronization of pwm go on this delay timer)
void PDB_0_init (void)
PDB0_MCTRL = 1<<PDBEN_PDB | 0b000<<TRIGSEL_PDB | 0<<CONT_PDB | 0<<LDOK_PDB | 0<<LDMOD_PDB | 0b000<<PRESCALER_PDB;
PDB0_MOD = 7000;
PDB0_CTRLA = 0<<FLTA | 0<<FLTAEN | 0<<FPOLA | 0<<FLENA | 0<<DAF | 0<<DAIE | 0<<DBF | 0<<DBIE | 0<<AINIT | 0<<ABSEL | 0<<BYPA | 0<<BYPB | 1<<ENA | 0<<ENB;
PDB0_DELAYA = 1600;
PDB0_MCTRL |= 1<<LDOK_PDB;