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Exporting hps gpio pin to device tree | LTC2308

NedoTodoric
Beginner
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Hi everyone, 

 

I'm trying to make ltc2308 driver  work on de1soc board. Main issue for me is CONVST pin. 

LTC2308 works fine for me on NIOS processor (FPGA side), but  I need to implement it on hps side, as device in Linux. 

I have exported SPI from HPS and connected them to ADC pins. 

Vhdl code:

ADC_CS_n : out std_logic;
ADC_DIN : out std_logic;
ADC_DOUT : in std_logic;
ADC_SCLK : out std_logic;

hps_0_spim0_txd => ADC_DIN,
hps_0_spim0_rxd => ADC_DOUT,
hps_0_spim0_ss_in_n => '1',
hps_0_spim0_ss_0_n => ADC_CS_n,

hps_0_spim0_sclk_out_clk => ADC_SCLK,

 

Problem is, i don't know how to see exported gpio pin in device tree so I can assign it as conversion-start pin in device tree node of ltc2308. 

Also, I tried to add PIO component and assign it to GPIO header, to make it work like it was done on this example:  github link

Result is given in attachments, it's just zeroed. Like the CONVST pin isn't working right. 

 

Any help will be really appreciated.

 
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EBERLAZARE_I_Intel
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Hi,

 

You may need to refer to this documentation on how to create and edit the device tree after compilation:

https://rocketboards.org/foswiki/Documentation/HOWTOCreateADeviceTree

 

 

 

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