Example program does nothing : Illuminate LEDs in sequence.

[BeauWebber]

Hi, has anyone else had problems with the :
Illuminate multiple LEDs in sequence on an XC-1A board example ?
It does nothing on my XC-1A board, though the parallel version works fine.
cheers,
Beau

[Bianco]

Can you perhaps attach the code and/or the XE file?

[BeauWebber]

Can you perhaps attach the code and/or the XE file?

OK, thanks :
[

main.xc

.xn file :

Code: Select all

<?xml version="1.0" encoding="UTF-8"?>
<Network xmlns="http://www.xmos.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.xmos.com http://www.xmos.com">
  <Type>Board</Type>
  <Name>XC-1A Development Board</Name>
  <BoardId>0002051X</BoardId>

  <Declarations>
    <Declaration>core stdcore[4]</Declaration>
  </Declarations>

  <Packages>
    <Package id="0" Type="XS1-G4B-FB512">
      <Nodes>
        <Node Id="0" InPackageId="0" Type="XS1-G4B" Oscillator="20MHz" SystemFrequency="400MHz">
          <Boot>
            <Source Location="SPI:bootFlash"/>
          </Boot>
          <Core Number="0" Reference="stdcore[0]">
            <Port Location="XS1_PORT_1A" Name="PORT_SPI_MISO"/>
            <Port Location="XS1_PORT_1B" Name="PORT_SPI_SS"/>
            <Port Location="XS1_PORT_1C" Name="PORT_SPI_CLK"/>
            <Port Location="XS1_PORT_1D" Name="PORT_SPI_MOSI"/>
            <Port Location="XS1_PORT_1E" Name="PORT_CLOCKLED_SELG"/>
            <Port Location="XS1_PORT_1F" Name="PORT_CLOCKLED_SELR"/>
            <Port Location="XS1_PORT_4C" Name="PORT_BUTTONLED"/>
            <Port Location="XS1_PORT_4D" Name="PORT_BUTTON"/>
            <Port Location="XS1_PORT_1H" Name="PORT_UART_TX"/>
            <Port Location="XS1_PORT_1I" Name="PORT_UART_RX"/>
            <Port Location="XS1_PORT_1K" Name="PORT_SPEAKER"/>
            <Port Location="XS1_PORT_8D" Name="PORT_CLOCKLED_0"/>
          </Core>
          <Core Number="1" Reference="stdcore[1]">
            <Port Location="XS1_PORT_8D" Name="PORT_CLOCKLED_1"/>
          </Core>
          <Core Number="2" Reference="stdcore[2]">
            <Port Location="XS1_PORT_8D" Name="PORT_CLOCKLED_2"/>
          </Core>
          <Core Number="3" Reference="stdcore[3]">
            <Port Location="XS1_PORT_8D" Name="PORT_CLOCKLED_3"/>
          </Core>
        </Node>
      </Nodes>
    </Package>
  </Packages>

  <ExternalDevices>
    <Device NodeId="0" Core="0" Class="SPIFlash" Name="bootFlash" Type="AT25DF041A">
      <Attribute Name="PORT_SPI_MISO" Value="PORT_SPI_MISO"/>
      <Attribute Name="PORT_SPI_SS"   Value="PORT_SPI_SS"/>
      <Attribute Name="PORT_SPI_CLK"  Value="PORT_SPI_CLK"/>
      <Attribute Name="PORT_SPI_MOSI" Value="PORT_SPI_MOSI"/>
    </Device>
  </ExternalDevices>

  <JTAGChain>
    <JTAGDevice NodeId="0"/>
  </JTAGChain>

</Network>

[Bianco]

Hello Beau,

I have modified your code to make it working:

Code: Select all

// Copyright (c) 2011, XMOS Ltd., All rights reserved
// This software is freely distributable under a derivative of the
// University of Illinois/NCSA Open Source License posted in
// LICENSE.txt and at <http://github.xcore.com/>

/*
 ============================================================================
 Name        : $(sourceFile)
 Description : Illuminate multiple LEDs in sequence on an XC-1A board 
 ============================================================================
 */

#include <platform.h>
#include <stdio.h>
#define PERIOD 20000000

out port cled0 = PORT_CLOCKLED_0;
out port cled1 = PORT_CLOCKLED_1;
out port cled2 = PORT_CLOCKLED_2;
out port cled3 = PORT_CLOCKLED_3;
out port cledG = PORT_CLOCKLED_SELG;
out port cledR = PORT_CLOCKLED_SELR;

void tokenFlash (chanend left, chanend right, out port led, int delay, int isMaster) {
    timer tmr;
    unsigned t;

    if (isMaster) /* master inserts token into ring */
        right <: 1;

    while (1) {
        int token;
        left :> token; /* input token from left neighbor */
        led <: 0x70;
        tmr :> t;
        tmr when timerafter (t+ delay ) :> void;
        led <: 0;
        right <: token; /* output token to right neighbor */
        
    }
}

int main (void) {
    chan c0, c1;
    par {
        on stdcore [0]: { cledG <: 1;
                            tokenFlash (c0, c1, cled0, PERIOD, 1);
                        }
        on stdcore [1]: tokenFlash (c1, c0, cled1, PERIOD, 0);
	// other cores
    }
    return 0;
}

There were two problems with your code:

A chan variable in XC is used to connect two chanends together.
When supplying a chan variable to two functions in a par statement, the tools will know that the two threads want to talk to each other and will set up the channel for you.
You have supplied each chan variable to only one function, leaving the chanends unconnected (you only need 2 chan variables for this program by the way).

This should give you a warning in the build window of the XDE like this:

C:\Users\Bianco\Desktop\xc1a_led>xcc -o test.xe test.xc -target=XC-1A
test.xc:45: warning: `c0' not used in two parallel statements
test.xc:47: warning: `c2' not used in two parallel statements

(I compiled it using the command line tools)

The second problem is that the LEDs of the clock are connected to an 8-bit port, but the LEDs don't start from bit 0, but instead from bit 4. I used 0x70 to illuminate the LEDs on bits 4, 5, 6.

Bianco

[BeauWebber]

Hello Beau,

I have modified your code to make it working:

Bianco

Thanks Bianco,
I don't have the module with me today, but will try what you say soon, thanks indeed,
Beau

[Edit]
Thanks again Bianco, yes I have just been able to try what you suggest, and that works fine.
I will now look at the code carefully, I need it as a prototype for a different sequential program that I want to try and write.
cheers,
Beau