Difference between revisions of "Custom Interrupts - PICmicro"
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| + | The Custom option of the [[Interrupt_Icon_Properties|Interrupt icon]] allows the creation of custom interrupt code. | ||
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| + | Many of the chips available in Flowcode support hardware driven interrupts that are not provided in the standard set of Flowcode interrupts. To allow users to add their own interrupts to suit their application Flowcode has the option to add your own custom interrupt. | ||
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| + | ==Old Versions== | ||
| + | This page is current for Flowcode v11 and later. Earlier versions can be found below: | ||
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| + | |+ | ||
| + | |- | ||
| + | | [[Special:PermanentLink/23682|Flowcode v10]] | ||
| + | |- | ||
| + | | [[Special:PermanentLink/23682|Flowcode v9]] | ||
| + | |- | ||
| + | | [[Special:PermanentLink/23682|Flowcode v8]] | ||
| + | |} | ||
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| + | <br> | ||
Here are a few examples for such interrupts using PICmicro chips. To create interrupts that are not shown below you will have to refer to the device datasheet. Once the code has been placed into the custom interrupt properties dialog, the interrupt can be enabled and disabled like any of the standard Flowcode [[Interrupt Icon Properties|Interrupts]]. | Here are a few examples for such interrupts using PICmicro chips. To create interrupts that are not shown below you will have to refer to the device datasheet. Once the code has been placed into the custom interrupt properties dialog, the interrupt can be enabled and disabled like any of the standard Flowcode [[Interrupt Icon Properties|Interrupts]]. | ||
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==USART Receive== | ==USART Receive== | ||
| − | [[File: | + | [[File:CustomInterrupt USART.png|right]] |
The Flowcode RS232 component can be used to set the Baud rate and configure the mode of operation, and the ReceiveRS232Char function can be used in the handler macro to read the data (clearing the interrupt). | The Flowcode RS232 component can be used to set the Baud rate and configure the mode of operation, and the ReceiveRS232Char function can be used in the handler macro to read the data (clearing the interrupt). | ||
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==Analogue Comparator== | ==Analogue Comparator== | ||
| − | [[File: | + | [[File:CustomInterrupt COMPARE.png|right]] |
'''Enable code:''' | '''Enable code:''' | ||
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| − | [[File: | + | [[File:CustomInterrupt TIMER.png|right]] |
'''Enable code:''' | '''Enable code:''' | ||
Revision as of 14:21, 3 February 2026
The Custom option of the Interrupt icon allows the creation of custom interrupt code.
Many of the chips available in Flowcode support hardware driven interrupts that are not provided in the standard set of Flowcode interrupts. To allow users to add their own interrupts to suit their application Flowcode has the option to add your own custom interrupt.
Old Versions
This page is current for Flowcode v11 and later. Earlier versions can be found below:
| Flowcode v10 |
| Flowcode v9 |
| Flowcode v8 |
Here are a few examples for such interrupts using PICmicro chips. To create interrupts that are not shown below you will have to refer to the device datasheet. Once the code has been placed into the custom interrupt properties dialog, the interrupt can be enabled and disabled like any of the standard Flowcode Interrupts.
USART receive - This can be nicely integrated with the Flowcode RS232 component.
Comparator - Example of the use of a function not supported by Flowcode.
Timer1 rollover - An example of the use of another unsupported, but potentially useful, function.
Target PIC Processor ( PIC16F877A )
(Note: For other PIC devices you may have to refer to the device datasheet to obtain the correct code)
USART Receive
The Flowcode RS232 component can be used to set the Baud rate and configure the mode of operation, and the ReceiveRS232Char function can be used in the handler macro to read the data (clearing the interrupt).
Enable code:
INTCONbits.PEIE = 1; // Enable peripheral interrupts
INTCONbits.GIE = 1; // Enable global interrupts
PIE1bits.RCIE = 1; // Enable USART receive interrupts
Disable code:
PIE1bits.RCIE = 0; // Disable USART receive interrupts
Handler code:
if (PIR1 & (1 << RCIF)) // Check to see if the interrupt flag is set
{
FCM_%n(); // Call Flowcode Macro
PIR1bits.RCIF = 0; // Clear interrupt flag
}
Analogue Comparator
Enable code:
INTCONbits.PEIE = 1; // Enable peripheral interrupts
INTCONbits.GIE = 1; // Enable global interrupts
PIE1bits.CCP1IE = 1; // Enable Capture Compare interrupts
Disable code:
PIE1bits.CCP1IE = 0; // Disable Capture Compare Interrupts
Handler code:
if (PIR1 & (1 << CCP1IF)) // Check to see if the interrupt flag is set
{
FCM_%n(); // Call Flowcode Macro
PIR1bits.CCP1IF = 0; // Clear interrupt flag
}
The state of the comparator input can be read into a Flowcode variable 'compstate' with the following C code line:
FCV_COMPSTATE = ccpr1l | ( ccpr1h << 8 );
** compstate must be declared as an integer variable ** |
Timer1 Rollover
Enable code:
T1CON = 0x79; // Start timer with Internal clock source, prescaler = 1:8
INTCONbits.PEIE = 1; // Enable peripheral interrupts
INTCONbits.GIE = 1; // Enable global interrupts
PIE1bits.TMR1IE = 1; // Enable Timer 1 interrupts
Disable code:
PIE1bits.TMR1IE = 0; // Disable Timer 1 interrupts
Handler code:
if (PIR1 & (1 << TMR1IF)) // Check to see if the interrupt flag is set
{
FCM_%n(); // Call Flowcode Macro
PIR1bits.TMR1IF= 0; // Clear interrupt flag
}
The captured 16-bit count value can be read into a Flowcode variable 'captval' with the following C code line:
FCV_CAPTVAL = TMR1L | ( TMR1H << 8 );
** captval must be declared as an integer variable ** |
