I'm trying to make an application that uses the Ecap0 to generate an output signal in APWM mode and the Ecap1 to capture the frecuency of an input signal. When I use them separatly they work fine, but when I use them together, the capture times revealed by the Ecap1 are not right.
Here are the configurations I use:
void ecap_0_init() {
// Counter Phase Control Register
Ecap0Regs->CTRPHS = 0;
// Control Register 1
Ecap0Regs->ECCTL1 = 0;
Ecap0Regs->ECCTL1 |= (0 << 0); // CAP1POL
Ecap0Regs->ECCTL1 |= (0 << 1); // CTRRST1
Ecap0Regs->ECCTL1 |= (0 << 2); // CAP2POL
Ecap0Regs->ECCTL1 |= (0 << 3); // CTRRST2
Ecap0Regs->ECCTL1 |= (0 << 4); // CAP3POL
Ecap0Regs->ECCTL1 |= (0 << 5); // CTRRST3
Ecap0Regs->ECCTL1 |= (0 << 6); // CAP4POL
Ecap0Regs->ECCTL1 |= (0 << 7); // CTRRST4
Ecap0Regs->ECCTL1 |= (0 << 8); // CAPLDEN
Ecap0Regs->ECCTL1 |= (0 << 9); // PRESCALE
Ecap0Regs->ECCTL1 |= (0 << 14); // FREE/SOFT
// Control Register 2
Ecap0Regs->ECCTL2 = 0;
Ecap0Regs->ECCTL2 |= (0 << 0); // CONT/ONESHT
Ecap0Regs->ECCTL2 |= (0 << 1); // STOP/WRAP
Ecap0Regs->ECCTL2 |= (0 << 3); // RE-ARM
Ecap0Regs->ECCTL2 |= (1 << 4); // TSCCTRSTOP
Ecap0Regs->ECCTL2 |= (0 << 5); // SYNCI_EN
Ecap0Regs->ECCTL2 |= (2 << 6); // SYNCO_SEL
Ecap0Regs->ECCTL2 |= (0 << 8); // SWSYNC
Ecap0Regs->ECCTL2 |= (1 << 9); // CAPT/APWM Mode
Ecap0Regs->ECCTL2 |= (0 << 10); // APWM Polarity
// CAP1 (TBPRD in APWM)
Ecap0Regs->CAP1 = ecap_calc_prd(1 << 3);
// CAP2 (CMPA in APWM)
Ecap0Regs->CAP2 = ecap_calc_amp(1 << 3);
}
void ecap_1_init() {
// Set ECAP1 pin as input
SysRegs->CFGCHIP1 &= ~(0x1F << 22);
// Disable all capture events
Ecap1Regs->ECEINT = 0x0;
// Clear all CAP interrupt flags
Ecap1Regs->ECCLR = 0xFFFF;
// Disable CAP1-CAP4 register loads
Ecap1Regs->ECCTL1 &= ~(1 << 8);
// Make sure the counter is stopped
Ecap1Regs->ECCTL2 &= ~(1 << 4);
// Counter Phase Control Register
Ecap1Regs->CTRPHS = 0;
// Control Register 1
Ecap1Regs->ECCTL1 = 0;
Ecap1Regs->ECCTL1 |= (0 << 0); // CAP1POL
Ecap1Regs->ECCTL1 |= (1 << 1); // CTRRST1
Ecap1Regs->ECCTL1 |= (0 << 2); // CAP2POL
Ecap1Regs->ECCTL1 |= (1 << 3); // CTRRST2
Ecap1Regs->ECCTL1 |= (0 << 4); // CAP3POL
Ecap1Regs->ECCTL1 |= (1 << 5); // CTRRST3
Ecap1Regs->ECCTL1 |= (0 << 6); // CAP4POL
Ecap1Regs->ECCTL1 |= (1 << 7); // CTRRST4
Ecap1Regs->ECCTL1 |= (0 << 9); // PRESCALE
Ecap1Regs->ECCTL1 |= (0 << 14); // FREE/SOFT
// Control Register 2
Ecap1Regs->ECCTL2 = 0;
Ecap1Regs->ECCTL2 |= (0 << 0); // CONT/ONESHT
Ecap1Regs->ECCTL2 |= (3 << 1); // STOP/WRAP
Ecap1Regs->ECCTL2 |= (0 << 5); // SYNCI_EN
Ecap1Regs->ECCTL2 |= (2 << 6); // SYNCO_SEL
Ecap1Regs->ECCTL2 |= (0 << 8); // SWSYNC
Ecap1Regs->ECCTL2 |= (0 << 9); // CAPT/APWM Mode
Ecap1Regs->ECCTL2 |= (0 << 10); // APWM Polarity
// Enable Captures
Ecap1Regs->ECCTL1 |= (1 << 8);
// Start Counter
Ecap1Regs->ECCTL2 |= (1 << 4);
// Re-arm
Ecap1Regs->ECCTL2 |= (1 << 3);
// Interrupt Enable Register
Ecap1Regs->ECEINT = 0;
Ecap1Regs->ECEINT |= (0 << 1); // CEVT1
Ecap1Regs->ECEINT |= (0 << 2); // CEVT2
Ecap1Regs->ECEINT |= (0 << 3); // CEVT3
Ecap1Regs->ECEINT |= (1 << 4); // CEVT4
Ecap1Regs->ECEINT |= (0 << 5); // CTROVF
Ecap1Regs->ECEINT |= (0 << 6); // CTR=PRD
Ecap1Regs->ECEINT |= (0 << 7); // CTR=CMP
}
void ecap_1_isr() {
static int i = 0;
_disable_interrupts();
valores[i++] = Ecap1Regs->CAP1;
valores[i++] = Ecap1Regs->CAP2;
valores[i++] = Ecap1Regs->CAP3;
valores[i++] = Ecap1Regs->CAP4;
if (i == 1024) i = 0;
ecap_1_init();
IER |= (1 << 4);
_enable_interrupts();
}
The HWI_INT4 is set to act on the ECAP1 pin. As I said before, If I use the Ecap1 by its own it gives me the results I'm looking for in the valores array, but If I initialize the Ecap0 as well, the results are not correct, giving me captures well below (capture ~ 10-250) the result I'm looking for (capture ~ 2,500,000). It gives me the result I want in some captures but many are this bogus times that I don't understand what are they for.
Please let me know if I'm doing something wrong in my configuration.
Thanks in advance,
~ Aquiles Lacruz
