Blockset described on this wiki is deprecated since 2012.

For Model Based Design (MBD), use the free MPLAB Device Blocks for Simulink, tool from Microchip.
Updated Rapid Control Prototyping (RCP) custom projects are published at: https://lubin.kerhuel.eu.

Difference between revisions of "DsPIC Block/UART Configuration"

From http://www.kerhuel.eu/wiki - Simulink device driver Blockset for dsPIC / PIC24 / PIC32 Microcontrollers --[[User:LubinKerhuel|LubinKerhuel]] 12:40, 3 September 2009 (UTC)
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UART to be used
 
UART to be used
  
−
==Baud (kb/s)==
+
==Main==
 +
===Baud (kb/s)===
 
UART Speed you want to use. The exact speed will usually not be reach. An error above 4% usually gives no transmission errors. Check the error speed before use.
 
UART Speed you want to use. The exact speed will usually not be reach. An error above 4% usually gives no transmission errors. Check the error speed before use.
  
−
==Tx Rx Alternativ==
+
===Tx Rx Alternativ===
 
Use the Alternative Tx and Rx pin of the microcontroller if available. Use default pin otherwise.
 
Use the Alternative Tx and Rx pin of the microcontroller if available. Use default pin otherwise.
  
−
==Tx Interrupt Priority==
+
===TXEN===
−
Tx Interrupt are used when the block "Tx Output Multiplexed For Matlab Labview" is present. This block stores input into a circular buffer. The Tx interrupt get datas from this buffer.
+
Set the output pin TX active for transmitting serial data. This is automatically checked when a Tx or "Tx Output Multiplexed For Matlab Labview" is present.
 +
 
 +
===Info===
 +
Gives following information : UxBRG register value. The real bit rate achieved by the microcontroller and the error in percent between the real bit rate and the requested bit rate. The max Byte/Step is the maximum number of byte that can physically be sent during one diagram time step. If your schematic send more data throw the UART, somme data will be lost or the real time constraint will be violated (ie, the time step will be longer than expected).
  
 
==Tx Interrupt==
 
==Tx Interrupt==
−
The Microcontroller has an internal 4 bytes buffer TXBUF. "Interrupt on TXBUF becoming empty" will gives fewer but longer interrupt."Interrupt on transfer of every character to TSR" will fullfill the microcontroller internal buffer as soon as there is one empty place. This will result in more interrupts.
 
  
−
==TXEN==
+
===Tx Interrupt take place===
−
Set the output pin TX active for transmitting serial data. This is automatically checked when a Tx or "Tx Output Multiplexed For Matlab Labview" is present.
+
The UART peripheral has an internal 4 bytes Transmit buffer. Activating the Tx interrupt virtually extend this buffer to the desired size. The complete buffer size is the sum of the Tx interrupt buffer size plus the UART buffer size (4).
 +
The Tx interrupt can take place :
 +
*When the UART Peripheral Transmit buffer is empty
 +
*When the UART Peripheral Transmit buffer has one empty space
 +
 
 +
===Tx Interrupt Priority===
 +
Priority of the interrupt (1 is the lowest priority, 7 is the highest)
 +
 
 +
===Tx Interrupt buffer size===
 +
Size of the circular buffer used by the interrupt. The total buffer size for the UART Tx peripheral is then the Tx Interrupt buffer size plus the 4 bytes internal peripheral buffer.
 +
 
 +
==Rx Interrupt==
 +
 
 +
===Rx Interrupt take place===
 +
The UART peripheral has an internal 4 bytes Receive buffer. Activating the Rx interrupt virtually extend this buffer to the desired size. The complete buffer size is the sum of the Rx interrupt buffer size plus the UART buffer size (4).
 +
The Rx interrupt can take place :
 +
*When the UART Peripheral Receive buffer is full (contains 4 bytes)
 +
*When the UART Peripheral Receive buffer is 3/4 full (contains 3 bytes)
 +
*When the UART Peripheral Receive buffer contain 1 byte (receive 1 byte)
  
−
==RX Interrupt Priority==
+
===Rx Interrupt Priority===
−
Interrupt Priority
+
Priority of the interrupt (1 is the lowest priority, 7 is the highest)
  
−
==Info==
+
===Rx Interrupt buffer size===
−
Gives following information : UxBRG register value. The real bit rate achieved by the microcontroller and the error in percent between the real bit rate and the requested bit rate. The max Byte/Step is the maximum number of byte that can physically be sent during one diagram time step. If your schematic send more data throw the UART, somme data will be lost or the real time constraint will be violated (ie, the time step will be longer than expected).
+
Size of the circular buffer used by the interrupt. The total buffer size for the UART Rx peripheral is then the Rx Interrupt buffer size plus the 4 bytes internal peripheral buffer.

Revision as of 01:12, 16 June 2008

Block UART Configuration

The UART Configuration block set the parameters for the UART. Each UART has one Receive Rx pin and one Transmit pin Tx. The UART parameters are commmon for Rx and Tx of the same UART. The number or UART available depend on the Microcontroller used ( defined in the master block). Following parameters are fixed :

  • 1 stop bit
  • 8 bits data
  • no parity
  • no flow control

Dialog Box Parameters

UART Dialog, Tab General
UART Dialog, Tab Tx
UART Dialog, Tab Rx

n° UART

UART to be used

Main

Baud (kb/s)

UART Speed you want to use. The exact speed will usually not be reach. An error above 4% usually gives no transmission errors. Check the error speed before use.

Tx Rx Alternativ

Use the Alternative Tx and Rx pin of the microcontroller if available. Use default pin otherwise.

TXEN

Set the output pin TX active for transmitting serial data. This is automatically checked when a Tx or "Tx Output Multiplexed For Matlab Labview" is present.

Info

Gives following information : UxBRG register value. The real bit rate achieved by the microcontroller and the error in percent between the real bit rate and the requested bit rate. The max Byte/Step is the maximum number of byte that can physically be sent during one diagram time step. If your schematic send more data throw the UART, somme data will be lost or the real time constraint will be violated (ie, the time step will be longer than expected).

Tx Interrupt

Tx Interrupt take place

The UART peripheral has an internal 4 bytes Transmit buffer. Activating the Tx interrupt virtually extend this buffer to the desired size. The complete buffer size is the sum of the Tx interrupt buffer size plus the UART buffer size (4). The Tx interrupt can take place :

  • When the UART Peripheral Transmit buffer is empty
  • When the UART Peripheral Transmit buffer has one empty space

Tx Interrupt Priority

Priority of the interrupt (1 is the lowest priority, 7 is the highest)

Tx Interrupt buffer size

Size of the circular buffer used by the interrupt. The total buffer size for the UART Tx peripheral is then the Tx Interrupt buffer size plus the 4 bytes internal peripheral buffer.

Rx Interrupt

Rx Interrupt take place

The UART peripheral has an internal 4 bytes Receive buffer. Activating the Rx interrupt virtually extend this buffer to the desired size. The complete buffer size is the sum of the Rx interrupt buffer size plus the UART buffer size (4). The Rx interrupt can take place :

  • When the UART Peripheral Receive buffer is full (contains 4 bytes)
  • When the UART Peripheral Receive buffer is 3/4 full (contains 3 bytes)
  • When the UART Peripheral Receive buffer contain 1 byte (receive 1 byte)

Rx Interrupt Priority

Priority of the interrupt (1 is the lowest priority, 7 is the highest)

Rx Interrupt buffer size

Size of the circular buffer used by the interrupt. The total buffer size for the UART Rx peripheral is then the Rx Interrupt buffer size plus the 4 bytes internal peripheral buffer.

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