Hi Teams,
My customer is testing AM62. Now they face a problem about MCASP.
- Transmit is OK, although sometimes report : teardown timeout
- It's ok to record for the first time. But if system is reboot, BCDMA will report many interrupts and could not read MCASP fifo.
- Now it seems the data were updated too fast to cause many DMA interrupts?
- Because the Am62 is not released yet, if any you have any related documents could you share it to me via E-mail?
The captured log was showed below:
- First time log: (No overrun alert)
root@am62xx-evm:~# arecord -f cd test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
- Second time log
Log:
overrun!!! (at least 0.046 ms long)
overrun!!! (at least 0.021 ms long)
overrun!!! (at least 0.043 ms long)
overrun!!! (at least 0.017 ms long)
overrun!!! (at least 0.031 ms long)
overrun!!! (at least 0.022 ms long)
overrun!!! (at least 0.014 ms long)
overrun!!! (at least 0.015 ms long)
overrun!!! (at least 0.032 ms long)
overrun!!! (at least 0.033 ms long)
overrun!!! (at least 0.018 ms long)
overrun!!! (at least 0.032 ms long)
overrun!!! (at least 0.025 ms long)
overrun!!! (at least 0.021 ms long)
overrun!!! (at least 0.023 ms long)
overrun!!! (at least 0.018 ms long)
Interrupt:
39: 1517 0 0 0 GICv3 267 Level 2b00000.mcasp_rx
40: 0 0 0 0 GICv3 268 Level 2b00000.mcasp_tx
41: 0 0 0 0 MSI-INTA 1713152 Level 485c0100.dma-controller chan0
59: 164 0 0 0 MSI-INTA 1714176 Edge 485c0100.dma-controller chan1
71: 1 0 0 0 MSI-INTA 1714688 Level 485c0100.dma-controller chan1
89: 2462704 0 0 0 MSI-INTA 1715718 Edge 485c0100.dma-controller chan2 这里不正常，不应该有这么多中断
107: 2 0 0 0 MSI-INTA 1716230 Level 485c0100.dma-controller chan2
129: 203 0 0 0 MSI-INTA 1970707 Level 8000000.ethernet-tx0
219: 190 0 0 0 MSI-INTA 1971731 Level 8000000.ethernet
252: 0 0 0 0 GICv3 134 Level 8000000.ethernet
320: 0 0 0 0 GPIO 36 Edge -davinci_gpio id_gpio
FiFo:
Read at address 0x02B0100C (0xffff7fc9100c): 0x00000040