pwm_adc.bas File Reference

Example: generate PWM outputs and fetch them as ADC samples, draw graf. More...

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

Include dependency graph for pwm_adc.bas:

Go to the source code of this file.

Classes
class	PWM_PIN
	UDT to hold data for an output channel. 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).
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...
UInt32	last [...]
	The previous data of the channels. More...
PWM_PIN	ch [...]
	The structures for the output pins. More...
VAR	io = NEW PruIo
	Create a PruIo structure, wakeup subsystems.
VAR	scale = S_H / 65520
	The factor to scale values.
VAR	x = 0
	The start x position.
VAR	gap = 1
	The gap between x values.
VAR	xmax = S_W - gap - 1
	The maximal x position.
VAR	m = 0
	The mask for in-active channels.
VAR	n = 2
	The active channel number.
VAR	fg = RGB(0, 0, 0)
	The foreground color.
VAR	bg = RGB(250, 250, 250)
	The background color.
VAR	k = ASC(INKEY())
	The key code.
VAR	neu = S_H - CUINT(.Adc->Value[i + 1] * scale)
	The new value.

Detailed Description

Example: generate PWM outputs and fetch them as ADC samples, draw graf.

This file contains an example on how to use libpruio to generate Pulse Width Modulated (PWM) output. Here the two channels (A + B) of an eHRPWM module and an eCAP module (in PWM) mode generate the PWM signals. The output gets measured by the ADC subsystem at channels AIN-0 to AIN-2, and shown as a line graf in a graphics windows. Find a functional description in section pwm_adc.

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

Compile by: fbc -w all pwm_adc.bas

Since

0.0

Definition in file pwm_adc.bas.

Function Documentation

main()

int main

(

)

The main function.

Definition at line 175 of file pwm_adc.bas.

Here is the call graph for this function:

Variable Documentation

ch

PWM_PIN ch[...]

Initial value:

= { 
    TYPE<PWM_PIN>(P9_14, 2.5, .5, @"P9_14 (A)") 
  , TYPE<PWM_PIN>(P9_16, 2.5, .2, @"P9_16 (B)") 
  , TYPE<PWM_PIN>(P9_42, 2.5, .8, @"P9_42 (C)") 
  }

The structures for the output pins.

Definition at line 81 of file pwm_adc.bas.

col

UInt32 col[...]

Initial value:

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

The colors for the lines (= channels).

Definition at line 50 of file pwm_adc.bas.

last

UInt32 last[...]

Initial value:

= { 
    0 
  , 0 
  , 0 
  , 0 
  , 0 
  , 0 
  , 0 
  , 0 
    }

The previous data of the channels.

Definition at line 58 of file pwm_adc.bas.