Peter,
On Wednesday 28 May 2008 01:03, Peter Wurmsdobler wrote:
does anybody understand the DAM unit in the i.MX27 processor?
Not that I really understand the AUDMUX unit, but the current Freescale BSP (19 Dec 2007) contains an audio/alsa driver which makes use of the AUDMUX, or DAM, in order to route audio streams to/from the mx27's SSI1 and SSI2 to the PMIC's SSIs. PMIC is a the power management and audio chip which is on the ADS board. Unfortunately I do not have the file with me, it is called ./sound/arm/mxc-pmic-alsa.c I believe.
I will be back in office next week, maybe we can have a chat then, if it is not too late.
Yes, I know this file. And I'm using the code from this file to setup my DAM hardware. But I'm not sure if I connect the right ports in the right way to each other. My external PMIC is connected to the processor's SSI1_* pins. And it provides i2s clock and frame signal. But the internal SSI unit does not send any data, so I believe it does not get these signals from the PMIC.
BTW: The last instruction in the DAM code in sound/arm/mxc-pmic-alsa.c is: writel(AUD_MUX_CONF, IO_ADDRESS(AUDMUX_BASE_ADDR) + 0x38); but the last valid register in the DAM unit is at AUDMUX_BASE_ADDR + 0x1C....
Juergen