mmap mcasp clk.c

/*
- While play is running:
[offset        0]00000103 00000000 04000020 00000000 00000000 00000000 00000000 00000000 01050000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[offset       40]00074102 00000000 00000000 00000000 07000002 00000000 

- when aplay not running
[offset        0]00000103 00000000 04000020 00000000 00000000 00000000 00000000 00000000 01050000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[offset       40]00004102 00000000 00000000 00000000 07030000 00000000 

-----------edited code output for better visibility ----------------
after aplay:
sharedStart address: 4a005500
[offset        0]n=0: 0103 n=1: 0000 n=2: 4000020 n=3: 0000 n=4: 0000 n=5: 0000 n=6: 0000 n=7: 0000 n=8: 1050000 n=9: 0000 n=10: 0000 n=11: 0000 n=12: 0000 n=13: 0000 n=14: 0000 n=15: 0000
[offset       40]n=16: 74102 n=17: 0000 n=18: 0000 n=19: 0000 n=20: 7000002 n=21: 0000 n=22: 30000 n=23: 0000 n=24: 30000 n=25: 0000 n=26: 30000 n=27: 0000 n=28: 30000 n=29: 0000 n=30: 30000 n=31: 0000
[offset       80]n=32: 0002 n=33: 0000 n=34: 0000 n=35: 0000 n=36: 0000 n=37: 0000 n=38: 0000 n=39: 0000 n=40: 0000 n=41: 0000 n=42: 0000 n=43: 0000 n=44: 0000 n=45: 0000 n=46: 0000 n=47: 0000
[offset       c0]n=48: 0000 n=49: 0000 n=50: 0000 n=51: 0000 n=52: 0000 n=53: 0000 n=54: 0000 n=55: 0000 n=56: 0000 n=57: 0000 n=58: 0000 n=59: 0000 n=60: 0000 n=61: 0000 n=62: 0000 n=63: 0000 

before aplay:
sharedStart address: 4a005500
[offset        0]n=0: 0103 n=1: 0000 n=2: 4000020 n=3: 0000 n=4: 0000 n=5: 0000 n=6: 0000 n=7: 0000 n=8: 1050000 n=9: 0000 n=10: 0000 n=11: 0000 n=12: 0000 n=13: 0000 n=14: 0000 n=15: 0000
[offset       40]n=16: 4102 n=17: 0000 n=18: 0000 n=19: 0000 n=20: 7030000 n=21: 0000 n=22: 30000 n=23: 0000 n=24: 30000 n=25: 0000 n=26: 30000 n=27: 0000 n=28: 30000 n=29: 0000 n=30: 30000 n=31: 0000
[offset       80]n=32: 0002 n=33: 0000 n=34: 0000 n=35: 0000 n=36: 0000 n=37: 0000 n=38: 0000 n=39: 0000 n=40: 0000 n=41: 0000 n=42: 0000 n=43: 0000 n=44: 0000 n=45: 0000 n=46: 0000 n=47: 0000
[offset       c0]n=48: 0000 n=49: 0000 n=50: 0000 n=51: 0000 n=52: 0000 n=53: 0000 n=54: 0000 n=55: 0000 n=56: 0000 n=57: 0000 n=58: 0000 n=59: 0000 n=60: 0000 

---------------------------------------------
For more info, C program and also a package for mmap visit https://elinux.org/EBC_Exercise_11b_gpio_via_mmap
*/
// The mmap code:
#include <Mmap.h> // this is in Bela/include, so you 'll have to also build and link in core/Mmap.cpp
#include <stdio.h>
#include <stdint.h>
// fill these in based on the TRM
uint32_t pruSharedRam = 0x4a005500;   // pg 873 of AM57x manual: CM_IPU_MCASP1_CLKCTRL
uint32_t pruSharedRamSize = 0x58;   // just before CM_IPU_TIMER5_CLKCTRL which is at 0x4a00 5558
uint32_t pru0DataRam = 0;
uint32_t pru0DataRamSize = 0;
uint32_t pru1DataRam = 0;
uint32_t pru1DataRamSize = 0;
void map_and_print(const char* label, uint32_t start, uint32_t size)
{
  Mmap mem;
  uint32_t* ptr = (uint32_t*)mem.map(start, size);
  printf("%s", label);
  for(unsigned int n = 0; n < size / sizeof(*ptr); ++n)
  {
    if(0 == (n % 16))
       printf("\n[offset %8x]", n * sizeof(*ptr));
    printf("%08x ", ptr[n]);
  }
}
int main()
{
  map_and_print("shared", pruSharedRam, pruSharedRamSize);
  // map_and_print("pru 0 data", pru0DataRam, pru0DataRamSize);
  // map_and_print("pru 1 data", pru1DataRam, pru1DataRamSize);
  return 0;
}