rb_oszi.bas File Reference

Example: fetch ADC samples in a ring buffer and draw graf. More...

#include "BBB/pruio.bi"
#include "fbgfx.bi"

Include dependency graph for rb_oszi.bas:

Go to the source code of this file.

Macros
#define	DRAW_GRAF()
	Macro to draw a graph from the valid half of the ring buffer. More...

Functions
int	main ()

Variables
VAR	S_W = 0
	The screen width.
VAR	S_H = 0
	The srceen hight.
VAR	BPP = 0
	The bits per plain number.
VAR	full = fb.GFX_FULLSCREEN
	Fullscreen or windowed mode.
VAR	p = INSTR(COMMAND, "x")
	The position of the 'x' character (if any). More...
VAR	w = VALINT(COMMAND)
	The required window width.
VAR	h = VALINT(MID(COMMAND, p + 1))
	The required window hight.
UInt32	col [...]
	The colors for the lines (= channels). More...
VAR	io = NEW PruIo()
	Create a PruIo structure, wakeup subsystems.
VAR	samp = S_W SHL 1
	The number of samples to fetch (ring buffer size).
VAR	scale = S_H / 65520
	The scaling factor.
VAR	half = .Adc->Samples SHR 1
	half size of the ring buffer

Detailed Description

Example: fetch ADC samples in a ring buffer and draw graf.

This file contains an example on how to use the ring buffer mode of libpruio. A fixed step mask of AIN-4 and AIN-7 get sampled and drawn as a line graf to a grafic window. Unlike IO mode, the step mask cannot get changed in RB mode at run-time. Find a functional description in section rb_oszi.

Licence: GPLv3, Copyright 2014-2023 by Thomas{ doT ]Freiherr[ At ]gmx[ DoT }net

Compile by: fbc -w all rb_oszi.bas

Since

0.2

Definition in file rb_oszi.bas.

Macro Definition Documentation

DRAW_GRAF

#define DRAW_GRAF

(

)

Value:

  /* (multi line FreeBASIC #MACRO) 
  LINE (0, 0) - (S_W, S_H), RGB(250, 250, 250), BF
  FOR c AS INTEGER = 0 TO .Adc->ChAz - 1
    VAR i = c + .Adc->ChAz
    LINE (0, S_H - CUINT(p[c] * scale)) - _
         (1, S_H - CUINT(p[i] * scale)), col(c)
    FOR x AS INTEGER = 2 TO S_W
      i += .Adc->ChAz
      LINE - (x, S_H - CUINT(p[i] * scale)), col(c)
    NEXT
  NEXT
#ENDMACRO */

Macro to draw a graph from the valid half of the ring buffer.

Definition at line 58 of file rb_oszi.bas.

Function Documentation

main()

int main

(

)

The main function.

Definition at line 97 of file rb_oszi.bas.

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Variable Documentation

col

UInt32 col[...]

Initial value:

= { 
 
  , RGBA(255,   0,   0, 255) 
  , RGBA(  0, 255,   0, 255) 
  , RGBA(  0,   0, 255, 255) 
  , RGBA(255, 255,   0, 255) 
  , RGBA(255,   0, 255, 255) 
  , RGBA(  0, 255, 255, 255) 
  , RGBA(127, 127, 127, 255) 
    }

The colors for the lines (= channels).

Definition at line 46 of file rb_oszi.bas.

p

VAR p = INSTR(COMMAND, "x")

The position of the 'x' character (if any).

local pointer to the samples

Definition at line 28 of file rb_oszi.bas.