A fully open source Asterisk FXO/S module which supports up to 8 channels and based on Raspberry Pi
Follow this link to download Raspberry Pi Kernel https://www.raspberrypi.org/documentation/linux/kernel/building.md
cd ~/linux/arch/arm/boot/dts
vim bcm283x.dtsiGo to the section for DMA and follow below to remove interrupts 25, 26 and DMA 9, 10.
dma: dma@7e007000 {
compatible = "brcm,bcm2835-dma";
reg = <0x7e007000 0xf00>;
interrupts = <1 16>,
<1 17>,
<1 18>,
<1 19>,
<1 20>,
<1 21>,
<1 22>,
<1 23>,
<1 24>,
<1 25>, //remove
<1 26>, //remove
/* dma channel 11-14 share one irq */
interrupt-names = "dma0",
"dma1",
"dma2",
"dma3",
"dma4",
"dma5",
"dma6",
"dma7",
"dma8",
"dma9”, //remove
"dma10”, //remove
"dma11",
"dma12",
"dma13",Then add below tdm bus definition after the i2s section:
i2s: i2s@7e203000 {
compatible = "brcm,bcm2835-i2s";
reg = <0x7e203000 0x24>;
clocks = <&clocks BCM2835_CLOCK_PCM>;
dmas = <&dma 2>,
<&dma 3>;
dma-names = "tx", "rx";
status = "disabled";
};
// new section to add for oak8x:
tdm: tdm@7e203000 {
compatible = "brcm,pi-tdm";
reg = <0x7e203000 0x20>,
<0x7e101098 0x02>;
dmas = <&dma 2>,
<&dma 3>;
dma-names = "tx", "rx";
interrupts = <1 25>, <1 26>;
interrupt-names = "dma9", "dma10";
status = "okay";
};
cd ~/linux
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- dtbswhen done
mkdir pidtbs
cp arch/arm/boot/dts/*.dtb pidtbs/Then copy the new dtb files to the RaspberryPi /boot folder, make sure you have a backup before you overwrite them.
dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=onGet the source code from https://github.com/lixinswitchpi/oak.git
cd /usr/src/dahdi-linux
make
make installinstall required packages
apt install libncurses5-dev uuid-dev libjansson-dev libxml2-dev libsqlite3-dev openssl libssl-dev build-essentialDownload the asterisk-13.20.0 and recompile it, remember to check up the chan-dahdi
Please check out the detailed manual in https://switchpi.com/2018/08/29/manual-of-install-oak8x-module/