BelaPlatform/bela-image-builder

When/how should Bela start at boot?

Closed this issue · 4 comments

giuliomoro commented

I added a line at the end of /opt/Bela/bela_init.sh:

sleep $SLEEPTIME; /root/Bela/projects/basic/basic

Now, if SLEEPTIME=2 (seconds) or less, then the program actually starts but the PRU hangs during a DAC_WAIT_FOR_FINISH:

  423 :                   : .macro DAC_WAIT_FOR_FINISH
  424 :                   :  LOOP:
  425 :                   :      LBBO r27, reg_spi_addr, SPI_CH0STAT, 4
  426 :                   :      QBBC LOOP, r27, 0
  427 :                   : .endm

so probably something is wrong in booting up the SPI peripheral?

If SLEEPTIME=4 then the program starts fine. I hear sound 19 seconds after I power up the board (after a graceful shutdown).
If SLEEPTIME=3 then it depends. Once it started and worked fine, the other time it started but stopped after half a second (PRU hanged again at that point).

giuliomoro commented

try merging the dtbo into the dtb to fix this?

giuliomoro commented

After b(h)a(c)king the overlays inside the main dtb file, then I can have /root/Bela/projects/basic/basic at the bottom of /opt/Bela/init_bela.sh (after uncommenting the overlays) and with NO $SLEEPTIME and then I hear sound 16 seconds after powering up the board.

LBDonovan commented

oh sweet, can you put the dtb in boot in the this repo? I'll see if I can get systemd to start it earlier.