On DSP BF537 EZkit board find Switch 7(Audio Selection Switch) set it exact as shown below:
1 = OFF 2 = ON 3 = ON 4 = OFF 5 = OFF 6 = OFF 7 = OFF 8 = OFF
To setup hardware for AD1836A card refer to this link:http://docs.blackfin.uclinux.org/doku.php?id=ad1836a Very Important: put your card on sport 0 connector, because we choose sport 0 in kernel configuration
To add support for the AD1836A audio card to the kernel build system, a few things must be enabled properly for things to work.
Linux Kernel Configuration Sound ---> [M] Sound card support Advanced Linux Sound Architecture ---> [ ] OSS Sequencer API [M] OSS Mixer API [M] OSS PCM (digital audio) API ALSA Blackfin devices ---> [M] 1836 Audio support for BF53x Interface between Blackfin and ADI1836 (TDM interace) ---> 5.1 Channels or 3 seperate stereos (3 stereos) ---> (0) Blackfin Audio SPORT port (NEW) (4) Blackfin Audio SPI channel selection bit (NEW)
Go to uclinux-dist directory and do menuconfig as following command:
arwillis@ece-vision1-pc:~/uclinux-dist$ make menuconfig
Kernel/Library/Defaults Selection ---> in the window configuration inside Kernel/Library/Defaults Selection ---> navigate to choose this option: [ ] Customize Kernel Settings (NEW)
Use space or enter key to select it after that save and exit.. A new configuration window should appear : Linux Kernel Configuration navigate find Device Drivers ---> press enter inside the device drivers configuration window find Sound ---> option press enter then make sure your configuration is right as shown above, and don't forget to select ALSA Blackfin devices --->1836 driver is under this option. when you done this step, go back the Device drivers navigate and locate the option of Character devices ---> then select it by press enter, under Character devices directory, make sure you select those two options: [*] Blackfin BF53x ADSP SPI ADC support [*] Blackfin BF53x SPORT support
Save and exit the menuconfig. Now we have built the driver into kernel, go back to uclinux-dist directory issue the following command:
Take about few minutes……….when it is done, copy the new image file to tftpboot folder.
arwillis@pc:~/uclinux-dist$ cp images/uImage /home/arwillis/bf537/tftpboot/uImage-bf537-1.00
Reset your DSP board you should see this line in your boot message:
Advanced Linux Sound Architecture Driver Version 1.0.12rc1 (Thu Jun 22 13:55:50 2006 UTC). dma_alloc_init: dma_page @ 0x00c53000 - 256 pages at 0x03f00000 ALSA device list: #0: ADI ad1836 at PF4 SPORT0 rx/tx dma 3/4 err irq 45
Check to make sure that the audio device is compiled into your kernel. If the special directory /proc/asound/AD1836A/ is in the root filesystem, the audio driver is compiled in.
root:~> ls -l /proc/asound/ad1836/ -r--r--r-- 1 0 0 0 id -rw-r--r-- 1 0 0 0 oss_mixer dr-xr-xr-x 3 0 0 0 pcm0c dr-xr-xr-x 3 0 0 0 pcm0p -rw-r--r-- 1 0 0 0 registers
Execute following command on your DSP board;
root:~> modprobe snd-ad1836 root:~> modprobe snd-pcm-oss root:~> lsmod Module Size Used by snd_pcm_oss 31952 0 snd_mixer_oss 11436 1 snd_pcm_oss snd_ad1836 14876 0 snd_pcm 49628 2 snd_pcm_oss,snd_ad1836 snd_timer 13644 1 snd_pcm snd_page_alloc 3940 1 snd_pcm snd 32032 5 snd_pcm_oss,snd_mixer_oss,snd_ad1836,snd_pcm,snd_timer soundcore 4032 1 snd root:~> tone TONE: generating sine wave at 1000 Hz...
If you can hear the 1k Hz tone, then you are ready to go! for more audio test see the link:http://docs.blackfin.uclinux.org/doku.php?id=ad1836a_setup