One detail, If I not wrong, the first 100 bytes of the dram is used by pru for some configs, register and other stuffs I don't remember right now, so you should use BASE Address +1000 at least
https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf?ts=1610923856664 - section 4.3 details the memory usage from PRU. Em seg., 18 de jan. de 2021 às 10:14, Gerhard Hoffmann < g...@hoffmann-hochfrequenz.de> escreveu: > Hi, > > just for the mapping, you won't need most of the include files. > > I often include xyz.h in xyz.c so that I get at least a warning when I > change > > sth. so that the public promises in .h no longer hold. > > pru_if.h is in the post but not needed. > > Remove the includes and the compiler will tell you what is missing. > > You definitely don't need ltcsrv.h and the stuff for nice(). > > > - A file descriptor must be used for /dev/mem: > > > int dev_mem_fd; > dev_mem_fd = open("/dev/mem",O_RDWR | O_SYNC); > > > - Shared RAM is mapped (prepared for use) by this line: > > > shared_ram = (int *) mmap(NULL, 12*1024, PROT_READ | PROT_WRITE, > MAP_SHARED, dev_mem_fd, 0x4A300000 + 0x10000); > > > - Here follows examples of usage (in this case, writing to shared ram > memory): > > > shared_ram[0] = ... ; //write to 0x4A310000 > shared_ram[1] = ... ; //write to 0x4A310004 > shared_ram[1] = ... ; //write to 0x4A310008 > > ^!! > > > Am I right? > > Yes. > > I should have snipped a lot of text, but was only half awake. > > Cheers, Gerhard > > > > -- > 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 beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/32141ab3-a346-b184-90bc-5c9bc810d169%40hoffmann-hochfrequenz.de > <https://groups.google.com/d/msgid/beagleboard/32141ab3-a346-b184-90bc-5c9bc810d169%40hoffmann-hochfrequenz.de?utm_medium=email&utm_source=footer> > . > -- 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAB6xwCr%3DA6UKZ0z8SJQyNPRxCdb0%3DPvBfQx_%3DA-g86j4gqj%2BQA%40mail.gmail.com.
