Hello,
I have a board with an AnalogDevices AD5592r connected to the
BeagleBoneBlack on SPI1.
I have built Linux version 4.9.1 with the default configuration and edited
the device tree file to add SPI1 support. HDMI is disabled.
I have configured the device tree overlay to enable the SPI1 port:
spi1_default: spi1_default {
pinctrl-single,pins = <
/* SPI 1 */
0x190 (PIN_INPUT | MUX_MODE3) /* mcasp0_aclkx.spi1_sclk */
0x194 (PIN_INPUT | MUX_MODE3) /* mcasp0_fsx.spi1_d0 */
0x198 (PIN_OUTPUT | MUX_MODE3) /* mcasp0_axr0.spi1_d1 */
0x19C (PIN_OUTPUT_PULLUP | MUX_MODE3) /* spi CS0 */
0x1B4 (PIN_OUTPUT_PULLUP | MUX_MODE7) /* spi CS1 */
>;
};
Also added the device to the port:
&spi1 {
cs-gpios = <0>;
pinctrl-names = "default";
pinctrl-0 = <&spi1_default>;
status = "okay";
ad5592r@0 {
compatible = "adi,ad5592r";
reg = <0>;
spi-max-frequency = <1000000>;
spi-cpol;
channel-modes = /bits/ 8 <
CH_MODE_DAC
CH_MODE_ADC
CH_MODE_DAC_AND_ADC
CH_MODE_DAC_AND_ADC
CH_MODE_ADC
CH_MODE_GPIO
CH_MODE_GPIO
CH_MODE_GPIO
>;
};
};
This is all as defined on the AD Wiki:
https://wiki.analog.com/resources/tools-software/linux-drivers/iio-dac/ad5592r
The driver is coming up as I can see it loaded:
ad5592r 3001 0
ad5592r_base 5903 1 ad5592r
Using a bus monitor I can see that the BBB is trying to talk to the AD
device but there is no response.... has anyone out there successfully
communicated with AD5592r over SPI1 ?
<https://lh3.googleusercontent.com/-P509sHB-C3o/WKDSnpwSM0I/AAAAAAAAACQ/b3izD722E-cOsHAqjEobGExpRaKj8DE9gCLcB/s1600/AD5592_SPI_trace.png>
Really trying to understand what is going on here and what would make there
be no response from the device when using the kernel driver.
Thanks
Marc
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