Other Parts Discussed in Thread: AM3352
Hello,
I'm using the latest SDK 07.00. We're trying to make audio work. Our board is loosely based on the beaglebone, except for the audio part, which is basically:
AM3352:mcasp ( so I²S ) => FPGA
As you can see, there is no codec in play here, as we really just want to send data out over the I²S lines, to the FPGA and the FPGA then decodes this. I think i'll need a dummy/generic codec or something to fake a soundcard?
This is what I have in my DT:
am33xx_pinmux: pinmux@44e10800 {
..
..
mcasp0_pins: mcasp0_pins {
pinctrl-single,pins = <
0x190 (PIN_OUTPUT | MUX_MODE0) /* mcasp0aclkx.mcasp0_aclkx */
0x1ac (PIN_OUTPUT | MUX_MODE0) /* mcasp0aclkx.mcasp0_ahclkx */
0x194 (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* mcasp0fsx.mcasp0_fsx */
0x198 (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* mcasp0axr0.mcasp0axr0 */
0x1a8 (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* mcasp0axr1.mcasp0axr1 */
>;
};
mcasp0_sleep_pins: mcasp0_sleep_pins {
pinctrl-single,pins = <
0x190 (PIN_INPUT_PULLDOWN | MUX_MODE7) /* mcasp0aclkx.mcasp0_aclkx */
0x1ac (PIN_INPUT_PULLDOWN | MUX_MODE7) /* mcasp0aclkx.mcasp0_ahclkx */
0x194 (PIN_INPUT_PULLDOWN | MUX_MODE7) /* mcasp0fsx.mcasp0_fsx */
0x198 (PIN_INPUT_PULLDOWN | MUX_MODE7) /* mcasp0axr0.mcasp0axr0 */
0x1a8 (PIN_INPUT_PULLDOWN | MUX_MODE7) /* mcasp0axr1.mcasp0axr1 */
>;
};
}
&mcasp0 {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&mcasp0_pins>;
pinctrl-1 = <&mcasp0_sleep_pins>;
status = "okay";
op-mode = <0>; /* MCASP_IIS_MODE */
tdm-slots = <2>;
/* 16 serializer */
serial-dir = < /* 0: INACTIVE, 1: TX, 2: RX */
0 0 0 1 1
>;
tx-num-evt = <32>;
rx-num-evt = <32>;
};
ocp{
..
..
sound {
compatible = "ti,da830-evm-audio"; ti,model = "my audio output"; ti,mcasp-controller = <&mcasp0>; ti,codec-clock-rate = <24000000>; ti,audio-routing = "Headphone Jack", "HPLOUT", "Headphone Jack", "HPROUT"; };
..
..
}
Kind regards,
Arend
