Hello I'm trying to write a simple program to test the IEP timers. Ideally I'd like to be able to poll the timer and get an unsigned long value back, but for this test, I followed what I read in this post:
https://www.element14.com/community/community/designcenter/single-board-computers/next-genbeaglebone/blog/2019/08/12/beaglebone-pru-timer-functionality With a few minor changes -- I provide a different GPIO pin, made it loop forever, and made the frequency for the square wave ~2kHz. I also have a different way of configuring the IEP/INTC. I manually defined the addresses: #define IEP_HOME ((volatile unsigned long*)0x2E000) #define TMR_GLOBAL_CFG (*(IEP_HOME+0x00)) #define TMR_GLOBAL_STATUS (*(IEP_HOME+0x04)) #define TMR_COMPEN (*(IEP_HOME+0x08)) #define TMR_COUNT (*(IEP_HOME+0x0C)) #define TMR_CMP0 (*(IEP_HOME+0x48)) #define TMR_CMP_STATUS (*(IEP_HOME+0x44)) #define TMR_CMP_CFG (*(IEP_HOME+0x40)) ... #define INTC_HOME ((volatile unsigned long*)(0x20000)) #define INTC_SECR0 (*(INTC_HOME+0x280)) #define INTC_SECR1 (*(INTC_HOME+0x284)) And I configured them like so: TMR_GLOBAL_CFG &= 0xfffffffe; // disable timer TMR_COUNT = 0x0; // reset timer TMR_CMP_STATUS = 0xff; // clear compare status TMR_CMP0 = 100000; // 0.0025 SEC @ 200 MHz TMR_COMPEN &= 0xff000000; // set compensation to 0 TMR_CMP_CFG &= 0x03; // enable cmp0 and reset on event INTC_SECR0 = 0xffffffff; INTC_SECR1 = 0xffffffff; TMR_GLOBAL_CFG = 0x11; // enable counter When I read from TMR_COUNT, it's always 0, and the interrupt never fires. What am I missing? Thanks, Fred -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/f0094b81-8d47-4631-91c5-b9f93e2888a5o%40googlegroups.com.
