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Im not aware of any issue or good reason to balance them over multiple tiles in a single device. I guess it would be nice to balance processing evenly for future development maybe?
Technical Director @ XMOS. Opinions expressed are my own
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Circling back to this, I noticed in extra_i2s.xc the example code has 2 extra inputs but no extra outputs. I was wondering how we can modify it to have some outputs instead? Specifically I want to output on 2 new ports, but I don't see anywhere tat I can define the dout ports like you did here:Ross wrote: ↑Thu Oct 10, 2024 10:59 am This will be more involved, you'll need to instantiate lib_i2s on the other tile - running as i2s slave.
You'll also need to wire up the clocks to this tile (LR and Bit)
These is an example app showing this done here:
https://github.com/xmos/sw_usb_audio/tr ... 6_extrai2s
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on tile[1]: in buffered port:32 p_i2s_din[1] = {XS1_PORT_1M}; // X1D36
on tile[1]: in port p_i2s_bclk = XS1_PORT_1O; // X1D38
on tile[1]: in buffered port:32 p_i2s_lrclk = XS1_PORT_1P; // X1D39
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Just declare an in output port array e.g.xmos_user123 wrote: ↑Fri Oct 25, 2024 1:26 am Circling back to this, I noticed in extra_i2s.xc the example code has 2 extra inputs but no extra outputs. I was wondering how we can modify it to have some outputs instead? Specifically I want to output on 2 new ports, but I don't see anywhere tat I can define the dout ports like you did here:
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on tile[1]: in buffered port:32 p_i2s_din[1] = {XS1_PORT_1M}; // X1D36 on tile[1]: in port p_i2s_bclk = XS1_PORT_1O; // X1D38 on tile[1]: in buffered port:32 p_i2s_lrclk = XS1_PORT_1P; // X1D39
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on tile[1]: out buffered port:32 p_i2s_dout[1] = {XS1_PORT_1A, XS1_PORT_1B};
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i2s_frame_slave(i_i2s, p_i2s_dout, 2, p_i2s_din, 1, DATA_BITS, p_i2s_bclk, p_i2s_lrclk, clk_bclk);
Nice!xmos_user123 wrote: ↑Fri Oct 25, 2024 1:26 am (also FYI the 700MHz solved our LRCLK frequency issue. We are now able to output 40 DAC channels across 5 ports on tile 0)
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Thanks for these code snippets, I've added them to extra_i2s.xc and placed it in the extensions folder of our project. When I try to compile I get a bunch of errors, do I need to link his file somehow for it to be recognized in the project
Also how can we modify the our original UseBufferManagement function to now fanout to both tiles?
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../src/extensions/extra_i2s.xc:3:10: fatal error: 'i2s.h' file not found
#include "i2s.h"
^
../src/extensions/extra_i2s.xc:56:44: error: parse error before "i_i2s"
void i2s_data(server i2s_frame_callback_if i_i2s, chanend c)
^
../src/extensions/extra_i2s.xc:66:31: error: use of undeclared identifer `c'
case inuint_byref(c, x):
^
/Applications/XMOS_XTC_15.3.0/target/include/xs1.h:1035:70: note: expanded from macro 'inuint_byref'
#define inuint_byref(c, val) __builtin_in_uint_byref(c, val)
^
../src/extensions/extra_i2s.xc:83:18: error: use of undeclared identifer `i_i2s'
case i_i2s.init(i2s_config_t &?i2s_config, tdm_config_t &?tdm_config):
^
../src/extensions/extra_i2s.xc:83:29: error: use of undeclared identifer `i2s_config_t'
case i_i2s.init(i2s_config_t &?i2s_config, tdm_config_t &?tdm_config):
^
../src/extensions/extra_i2s.xc:83:42: error: parse error before '?' token
case i_i2s.init(i2s_config_t &?i2s_config, tdm_config_t &?tdm_config):
^
../src/extensions/extra_i2s.xc:100:13: error: parse error before "case"
case i_i2s.send(size_t num_out, int32_t samples[num_out]):
^
../src/extensions/extra_i2s.xc:102:35: error: use of undeclared identifer `i'
for(size_t i = 0; i < EXTRA_I2S_CHAN_COUNT_OUT; i++)
^
../src/extensions/extra_i2s.xc:102:68: error: parse error before ')' token
for(size_t i = 0; i < EXTRA_I2S_CHAN_COUNT_OUT; i++)
^
../src/extensions/extra_i2s.xc:104:21: error: use of undeclared identifer `samples'
samples[i] = samplesOut[i];
^
../src/extensions/extra_i2s.xc:109:1: error: parse error before '}' token
}
^
../src/extensions/extra_i2s.xc:112:21: error: local variable `p_i2s_bclk' has type port
on tile[1]: in port p_i2s_bclk = XS1_PORT_1A;
^~~~~~~~~~
../src/extensions/extra_i2s.xc:113:33: error: local variable `p_i2s_lrclk' has type port
on tile[1]: in buffered port:32 p_i2s_lrclk = XS1_PORT_1B;
^~~~~~~~~~~
../src/extensions/extra_i2s.xc:114:34: error: local variable `p_i2s_dout' has type that contains a port
on tile[1]: out buffered port:32 p_i2s_dout[1] = {XS1_PORT_1E};
^~~~~~~~~~~~~
../src/extensions/extra_i2s.xc:116:19: error: local variable `clk_bclk' has type clock
on tile[1]: clock clk_bclk = XS1_CLKBLK_1;
^~~~~~~~
../src/extensions/extra_i2s.xc:120:37: error: storage size of 'i_i2s' isn't known
interface i2s_frame_callback_if i_i2s;
^~~~~
../src/extensions/extra_i2s.xc:124:47: error: use of undeclared identifer `p_i2s_din'
i2s_frame_slave(i_i2s, p_i2s_dout, 1, p_i2s_din, 1, DATA_BITS, p_i2s_bclk, p_i2s_lrclk, clk_bclk);
^
../src/extensions/extra_i2s.xc:124:9: error: unknown function identifier `i2s_frame_slave' (possibly missing prototype?)
i2s_frame_slave(i_i2s, p_i2s_dout, 1, p_i2s_din, 1, DATA_BITS, p_i2s_bclk, p_i2s_lrclk, clk_bclk);
^
../src/extensions/extra_i2s.xc:125:18: error: too many arguments to function `i2s_data'
i2s_data(i_i2s, c);
^~~~~
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void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudioToUsb[])
{
/*
[0] -> [0]
[1] -> [1]
...
[0] -> [24]
[1] -> [25]
...
*/
for(int i = 24; i > 7; i-=8)
for(int j = 7; j >= 0; j--)
{
sampsFromUsbToAudio[j+i] = sampsFromUsbToAudio[j];
}
}
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You're missing the I2S library, lib_i2s.
Based on previous posts I *think* you're using an old software version that uses the, now legacy, xcommon build system, in which case clone https://github.com/xmos/lib_i2s and add lib_i2s to USED_MODULES in Makefile
If you're using the new cmake based system, xcommon-cmake, (recommended) simply add lib_i2s to APP_DEPENDENT_MODULES in cmakelists.txt
i.e.
All the fetching will be handled automatically in the cmake step.
Based on previous posts I *think* you're using an old software version that uses the, now legacy, xcommon build system, in which case clone https://github.com/xmos/lib_i2s and add lib_i2s to USED_MODULES in Makefile
If you're using the new cmake based system, xcommon-cmake, (recommended) simply add lib_i2s to APP_DEPENDENT_MODULES in cmakelists.txt
i.e.
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set(APP_DEPENDENT_MODULES "lib_i2s")
All the fetching will be handled automatically in the cmake step.
Technical Director @ XMOS. Opinions expressed are my own
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Thanks for the reply. Also just following up on this question... how can we modify our original UseBufferManagement function to now fanout to both tiles?
Code: Select all
void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudioToUsb[])
{
/*
[0] -> [0]
[1] -> [1]
...
[0] -> [24]
[1] -> [25]
...
*/
for(int i = 24; i > 7; i-=8)
for(int j = 7; j >= 0; j--)
{
sampsFromUsbToAudio[j+i] = sampsFromUsbToAudio[j];
}
}
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The app_usb_aud_xk_evk_xu316_extrai2s gives an example of this
It shows saving off a channel end as a global:
https://github.com/xmos/sw_usb_audio/bl ... main.h#L11
Running the extra task:
https://github.com/xmos/sw_usb_audio/bl ... main.h#L20
Send the audio data over the channel in AudioBufferManagement()
https://github.com/xmos/sw_usb_audio/bl ... i2s.xc#L35
Receive the data over channel and pass data to I2S (TDM in your case I guess)
https://github.com/xmos/sw_usb_audio/bl ... i2s.xc#L57
It shows saving off a channel end as a global:
https://github.com/xmos/sw_usb_audio/bl ... main.h#L11
Running the extra task:
https://github.com/xmos/sw_usb_audio/bl ... main.h#L20
Send the audio data over the channel in AudioBufferManagement()
https://github.com/xmos/sw_usb_audio/bl ... i2s.xc#L35
Receive the data over channel and pass data to I2S (TDM in your case I guess)
https://github.com/xmos/sw_usb_audio/bl ... i2s.xc#L57
Technical Director @ XMOS. Opinions expressed are my own