Matlab-Simulink device driver Blockset for Microchip dsPIC / PIC24 / PIC32 Microcontrollers
Block/Input Capture
From http://www.kerhuel.eu/wiki - Simulink device driver Blockset for dsPIC / PIC24 / PIC32 Microcontrollers --[[User:LubinKerhuel|LubinKerhuel]] 12:40, 3 September 2009 (UTC)
The Input Capture (IC) block allow to get values from any kind of PWM data. Either Up, Down or both value can be captured. For each channel captured, a timer is automatically choosen and set to get the maximum resolution. Timer configuration is based on the max pulse duration you are to measure.
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Dialog Box Parameters
Interrupt Priority
Interrupt is declenche on rising and/or falling edge. The measure is then calculated and saved. The interrupt priority will not affect the accuracy of the measure because timers are read in hardware. Interrupt priority can affect measure on fast consecutive event.
Input Channels
Specify Input Capture channel(s) (IC) starting from 1. Specify multiple channels as a vector. This will also set the number of output for the block
Channels Input Type
Select for each channel which king of data you want to extract.
- 1 : is to get the High pulse duration
- 2 : is to get the Low pulse duration
- 3 : is to get both High and low pulse duration
- 4 : is to get the periode using rising edge
- 8 : is to get the periode using falling edge
- 5 : is to get both High pulse duration and periode using rising edge
- 10 : is to get both Down pulse duration and periode using falling edge
The value of the vector reffere to corresponding channel defined in "Input Channels".
Max/Channels
Define max time in secondes of the largest event tu be measure by the respective channel. Safety margin in %
Add a margin to the max time defined previously. This margin time allow to avoid provided the event is larger than the max attempted value.
ValMax / Channel Variable Name
This Variable will be evaluated in the workspace and allow you to scale the data.The ValMax is the max value that will be given by an event of the duration defined in Max/Channels. This value does not take into account the Safety margin.
Result Byte Resolution
This is the log2 of the ValMax Variables for each channels.
Timer
This is the timer that is used with the corresponding channel. It is set automatically. The timer prescaler are defined in the Master block.
Changed Detected on
Add outputs to the block. For each channel, you can know if a changed has appears. The output is set to 1 either on rising edge, falling edge or both.
Sample Time
-1 mean inherited
Status
Information if error encountred.
