Here is some sample code to use the ECAP module as a timer:
#include <stdint.h>
#include <string.h>
#include <pru_cfg.h>
#include <pru_ecap.h>
#define PRU0_ARM_INTERRUPT 19 // Interrupt used to signal to host we have
halted
volatile register uint32_t __R30; // Output pins
volatile register uint32_t __R31; // Input pins
/* Mapping Constant table register to variable */
volatile pruCfg CT_CFG __attribute__((cregister("CFG", near), peripheral)); //
PRU configuration from constants table
volatile pruEcap ECAP __attribute__((cregister("ECAP", near), peripheral)); //
ECAP module from constants table
#define ROUT __R30
#define RIN __R31
int main(void) {
// Enable OCP master ports - this enables pinmux pins to R30 & R31 & host
ram access
CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;
// Enable ECAP port for simple PWM (We need a timer tick)
ECAP.ECCTL2 = 0x0200; // PWM mode,continuous mode
ECAP.CAP1 = 0x060000; // Period = 1/1000th second
ECAP.CAP2 = 0x000000; // Duty cycle
ECAP.TSCTR = 0; // Reset the counter (it may be past the period)
ECAP.CTRPHS = 0;
ECAP.ECEINT = 0x0040; // Counter reset interrupt enable
ECAP.ECCTL1 = 0x0000; // do not reset on capture
ECAP.ECCTL2 |= 0x10; // Start the timer
while (1) {
// Do work in the loop
while ((ECAP.ECFLG & 0x40) == 0); // Wait for timer to reset
ECAP.ECCLR = 0xff; // Clear the condition
}
}
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