axis fifo giving resource unavailable error

[tomrae-eaton]

I have the axis_stream_fifo setup.

I attempt to read the data and display it in ascii.
I can read some data which should be a counter that I am clocking in, but all I get are zeros and then I get
Failed to read from FIFO: Resource temporarily unavailable

root@platform:/apps# poke 0x41200000 1 && ./readfifo
Read 8 bytes from FIFO:
00 00 00 00 00 00 00 00
root@platform:/apps# poke 0x41200000 1 && ./readfifo
Read 8 bytes from FIFO:
00 00 00 00 00 00 00 00
root@platform:/apps# poke 0x41200000 1 && ./readfifo
Read 8 bytes from FIFO:
00 00 00 00 00 00 00 00
root@platform:/apps# poke 0x41200000 1 && ./readfifo
Read 8 bytes from FIFO:
00 00 00 00 00 00 00 00
root@platform:/apps# poke 0x41200000 1 && ./readfifo
Read 8 bytes from FIFO:
00 00 00 00 00 00 00 00
root@platform:/apps# poke 0x41200000 1 && ./readfifo
Failed to read from FIFO: Resource temporarily unavailable

I cannot read again unless I reboot.

[jacobfeder]

Not sure what you're doing with the poke command. Have you tried setting up 2 AXIS FIFOs in loopback and running the example in the apps dir?

[tomrae-eaton]

Jacob, The poke command or any other command the can write to memory, sets the resetn of the data counter to 1 letting data to be clocked into the stream. The leds should light when data is being clocked into the fifo. Have not tried 2 in loop mode. Tom From: Jacob Feder ***@***.***> Sent: Monday, July 10, 2023 11:10 AM To: jacobfeder/axisfifo ***@***.***> Cc: Rae, Tom C ***@***.***>; Author ***@***.***> Subject: [EXTERNAL] Re: [jacobfeder/axisfifo] axis fifo giving resource unavailable error (Issue #25) Not sure what you're doing with the poke command. Have you tried setting up 2 AXIS FIFOs in loopback and running the example in the apps dir? — Reply to this email directly, view it on GitHub<#25 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/A6VEOMTVH5KAO5ET5UF4JA3XPQLN7ANCNFSM6AAAAAA2ERSMRE>. You are receiving this because you authored the thread.Message ID: ***@***.******@***.***>>

[jacobfeder]

so poke is doing something to trigger your IP? Not sure I'm following.

[tomrae-eaton]

Jacob, Yes, it is setting a gpio output to take my data counter out of reset. I clocked a 16 bit counter(to emulate my ADCs) into four axis_data_fifos. The into an axis_stream_combiner. The four 16 bit values were spread over 512 bits. The axis_stream_subset_converter shifts the 4 16bit values to the lower 64bits. I then monitor the axis_data_fifos tready signal, And when ready, clock in 64 bit values at 10mhz rate using the tvalid signal. Tready is tied high. Simulation looks good. I added ila cores and see data flowing into the fifo. On the read end I get some zeros and then the resource unavailable. I can see the read from petalinux on the axi bus in chipscope although the data does not look right. I am just trying to set up a continuous stream into a virtual fifo of a certain size and then capture the fifo data on a trigger. I changed the axi interconnect to 64 bits and have axi4 full enabled. I suspect bit width and data type errors. Possibly platform setup, although vivado said it was happy. I removed the counter and added another fifo. Each output routed to the others input. I run a loopback test and get the following. Thanks for your help. ./loopback Failed to read from FIFO2: Resource temporarily unavailable ***@***.***:~/hsvm_apps# cat /dev/axis_fifo_0x43c00000 cat: read error: Resource temporarily unavailable ***@***.***:~/hsvm_apps# cat /dev/axis_fifo_0x43c20000 cat: read error: Resource temporarily unavailable ***@***.***:~/hsvm_apps# #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/mman.h> #define FIFO1_PATH "/dev/axis_fifo_0x43c00000" #define FIFO2_PATH "/dev/axis_fifo_0x43c20000" #define DATA_SIZE 4 // Number of data elements to write/read int main() { int fifo1_fd, fifo2_fd; int i; unsigned int write_data[DATA_SIZE] = {0x12345678, 0xAABBCCDD, 0xEEFF0011, 0x44556677}; unsigned int read_data[DATA_SIZE] = {0}; // Open FIFO1 for writing fifo1_fd = open(FIFO1_PATH, O_WRONLY); if (fifo1_fd < 0) { perror("Failed to open FIFO1"); return -1; } // Open FIFO2 for reading fifo2_fd = open(FIFO2_PATH, O_RDONLY); if (fifo2_fd < 0) { perror("Failed to open FIFO2"); close(fifo1_fd); return -1; } // Write data to FIFO1 if (write(fifo1_fd, write_data, DATA_SIZE * sizeof(unsigned int)) != DATA_SIZE * sizeof(unsigned int)) { perror("Failed to write to FIFO1"); close(fifo1_fd); close(fifo2_fd); return -1; } // Read data from FIFO2 if (read(fifo2_fd, read_data, DATA_SIZE * sizeof(unsigned int)) != DATA_SIZE * sizeof(unsigned int)) { perror("Failed to read from FIFO2"); close(fifo1_fd); close(fifo2_fd); return -1; } // Close FIFO file descriptors close(fifo1_fd); close(fifo2_fd); // Print the read data for (i = 0; i < DATA_SIZE; i++) { printf("Read Data[%d]: 0x%08X\n", i, read_data[i]); } return 0; } Tom From: Jacob Feder ***@***.***> Sent: Monday, July 10, 2023 3:50 PM To: jacobfeder/axisfifo ***@***.***> Cc: Rae, Tom C ***@***.***>; Author ***@***.***> Subject: [EXTERNAL] Re: [jacobfeder/axisfifo] axis fifo giving resource unavailable error (Issue #25) so poke is doing something to trigger your IP? Not sure I'm following. — Reply to this email directly, view it on GitHub<#25 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/A6VEOMXQIRZFU2MP3E5ZYGDXPRMEVANCNFSM6AAAAAA2ERSMRE>. You are receiving this because you authored the thread.Message ID: ***@***.******@***.***>>

[jacobfeder]

You can only use AXI lite interface. I would recommend something very simple for starters - configure them in a "loopback" mode so you can write data to 1 and read from the other. If that works then you can try adding back in your more complex firmware system.