llakie

Most recent activity

• Limit to number of arguments to inline C function

  in General • 1 year, 1 month

  

  Now it gets really strange: This works, but why?

  E.getAddressOf(new Int32Array([
                  begin, 0, 0, 0, 0, 0, 0, 0,
                  end, 0, 0, 0,
                  offset,
                  stepping
  ]), true)
  

  Accessing data at index 0, 8, 12 and 13. Any other "configuration" using different 0-spacings does not work. I'm completly lost.

• Limit to number of arguments to inline C function

  in General • 1 year, 1 month

  

  If I'm not passing the array as a flat data area in the ram, the source code says, that I'm getting an array of JSVar pointers instead. So would it be correct to have an **int params parameter then, since it's actually an array of pointers. How do I retrieve the value of this variable then? Is there some param[0]->get_value()? I did not find anything in the source code.
  But I actually would prefer the flat array option, since this makes working with the values far easier. As said in a comment above: I'm really not that into C at all. I'm just tinkering around with it. Thanks for any of your help.

• Limit to number of arguments to inline C function

  in General • 1 year, 1 month

  

  Thank you for your reply. Your advice at least solves part of the problem. Now the first variable in the array params[0] is the expected value. But unfortunately not the others (params[1..n]).
  I tried padding the Uint32Array to 32bytes and 64bytes without any further luck. Do you have any other Idea? Does it have something to do with signed or unsigned bytes?

• Limit to number of arguments to inline C function

  in General • 1 year, 1 month

  

  I also tried to change my C-function signature to

  int find_sequence(unsigned char* buffer, unsigned char* sequence, int sequence_length, int* params) {}
  

  And pass in an Int32Array. This does not work either. What I noticed is, that whenever I'm returning any of the values from params, I get a static value, which stays the same - so something more like a fixed memory address. But I read that accessing a value by ptr[X] automatically dereferences it and lets me access the value as *(ptr + 0) would do.

• Limit to number of arguments to inline C function

  in General • 1 year, 1 month

  

  Hi Gordon, I just came accross this question here and I've the same problem as user113695. I followed your advice, but I just get "garbage" data delivered in my C-function.
  I'm not the C guy, so I definitly doing something wrong here
  C-Function:

  // int find_sequence(int, int, int, int)
      int find_sequence(unsigned char* buffer, unsigned char* sequence, unsigned int sequence_length, unsigned int* params) {... return params[0]; }
  

  And in the code I'm calling it with

  const result = findNative.find_sequence(
              E.getAddressOf(this.buffer, true),
              E.getAddressOf(sequence, true),
              sequence.length,
              E.getAddressOf(new Uint32Array([
                  this.idx,
                  this.next,
                  offset,
                  stepping
              ]), true)
  );
  

  The first three parameters are working beautifully. No matter if I'm accessing params[0], params[1], params[2] or params[3], they all seem to have random values stored within.

  Could you help out Gordon?
  Thank you very much in advance.

• Why is JIT not enabled on devices like Espruino WiFi even if they are on the latest firmware?

  @llakie started

  • 8 comments
  • 637 views

  @fanoush replied
• Why is JIT not enabled on devices like Espruino WiFi even if they are on the latest firmware?

  in Pico / Wifi / Original Espruino • 1 year, 1 month

  

  I was just the fact, that I enabled minification, which led to the fact, that no errors were shown at all. Once I turned it off, the error you mentioned appeared :)

• Why is JIT not enabled on devices like Espruino WiFi even if they are on the latest firmware?

  in Pico / Wifi / Original Espruino • 1 year, 1 month

  

  Ok, I found the mistake. "continue" is not supported. As I fixed that it worked after turning off any minification of the code. If I minify, it does somehow not work anymore but does not give me any hint why. I was finally able to shave off another 150ms from my computation, which is very good :) Thank you very much Gordon.

• Why is JIT not enabled on devices like Espruino WiFi even if they are on the latest firmware?

  in Pico / Wifi / Original Espruino • 1 year, 1 month

  

  Thank you very much. After a bit of experimenting, I'm currently trying to find out, why the following function hangs indefinitly. It's a function which scans a portion (from this.idx to this.next) of an array for a given sequence, starting at an offset using a given stepping width.

  find(sequence, offset, stepping) {
          "jit";
          if (stepping === undefined) {
              stepping = 1;
          }
  
          if (offset === undefined) {
              offset = 0;
          }
  
          for (let i = this.idx + offset; i < this.next - sequence.length; i+=stepping) {
              if (this.buffer[i] !== sequence[0]) {
                  continue;
              }
              
              let idx = i;
  
              for (let j = 1; j < sequence.length; j++) {
                  if (this.buffer[i + j] !== sequence[j]) {
                      idx = -1;
                      // JIT lacks break statement
                      j = sequence.length - 1;
                  }
              }
  
              if (idx !== -1) {
                  return idx;
              }
          }
  
          return -1;
      }
  

  When I run it without jit it works as expected. If the function is jitted, the application hangs without any error. Thank you for your reply

• Why is JIT not enabled on devices like Espruino WiFi even if they are on the latest firmware?

  in Pico / Wifi / Original Espruino • 1 year, 1 month

  

  I saw, that only Bluetooth enabled devices are supported. Could you explain why this is? I really would like to use this feature to speed up some computational work on the Microcontroller.
  I'm currently on version 2.17 and I'm using an Espruino WiFi.
  Thank you :)