Difference between revisions of "Custom Interrupts - AVR"
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| + | <sidebar>Sidebar: What Is an Interrupt?</sidebar> | ||
<font style="color:#FF0000"> '''Target AVR Processor''' ( ATMEGA8, 16, 32 ) | <font style="color:#FF0000"> '''Target AVR Processor''' ( ATMEGA8, 16, 32 ) | ||
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==USART Receive== | ==USART Receive== | ||
| + | [[File:Gen_Customer_Interrupts_AVR_USART.png|right]] | ||
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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). | ||
| − | ''Enable code:'' | + | '''Enable code:''' |
<span style="color:#000080"> UCSRB |= ((1 << RXCIE) | (1 << RXEN)); // enable USART receiver and receive interrupts </span> | <span style="color:#000080"> UCSRB |= ((1 << RXCIE) | (1 << RXEN)); // enable USART receiver and receive interrupts </span> | ||
| − | ''Disable code:'' | + | '''Disable code:''' |
<span style="color:#000080"> UCSRB &= ~(1 << RXCIE); // disable USART receive interrupts </span> | <span style="color:#000080"> UCSRB &= ~(1 << RXCIE); // disable USART receive interrupts </span> | ||
| − | ''Handler code:'' | + | '''Handler code:''' |
<font style="color:#000080"> ISR(USART_RXC_vect) // USART receive vector | <font style="color:#000080"> ISR(USART_RXC_vect) // USART receive vector | ||
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{ | { | ||
| − | FCM_%n(); // | + | FCM_%n(); // Call Flowcode Macro |
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| + | }</font> | ||
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[[File:Gen_Custom_Interrupts_AVR_COMPARITOR.png|right]] | [[File:Gen_Custom_Interrupts_AVR_COMPARITOR.png|right]] | ||
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'''Enable code:''' | '''Enable code:''' | ||
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| − | '''Disable code:'' | + | '''Disable code:''' |
<span style="color:#000080"> ACSR &= ~(1 << ACIE); // disable comparator interrupts </span> | <span style="color:#000080"> ACSR &= ~(1 << ACIE); // disable comparator interrupts </span> | ||
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{ | { | ||
| − | FCM_%n(); // | + | FCM_%n(); // Call Flowcode Macro |
| − | } </font> | + | }</font> |
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<span style="color:#000080"> FCV_COMPSTATE = ACSR & (1 << ACO); </span> | <span style="color:#000080"> FCV_COMPSTATE = ACSR & (1 << ACO); </span> | ||
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[[File:Gen_Custom_Interrupts_AVR_TIMER1.png|right]] | [[File:Gen_Custom_Interrupts_AVR_TIMER1.png|right]] | ||
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'''Enable code:''' | '''Enable code:''' | ||
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{ | { | ||
| − | FCM_%n(); // | + | FCM_%n(); // Call Flowcode Macro |
}</font> | }</font> | ||
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<span style="color:#000080"> FCV_CAPTVAL = ICR1; </span> | <span style="color:#000080"> FCV_CAPTVAL = ICR1; </span> | ||
| − | + | {| width="auto" | |
| + | |<pre>** captval must be declared as an integer variable **</pre> | ||
| + | |} | ||
Latest revision as of 15:25, 21 January 2015
<sidebar>Sidebar: What Is an Interrupt?</sidebar> Target AVR Processor ( ATMEGA8, 16, 32 )
(Note: For other AVR 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:
UCSRB |= ((1 << RXCIE) | (1 << RXEN)); // enable USART receiver and receive interrupts
Disable code:
UCSRB &= ~(1 << RXCIE); // disable USART receive interrupts
Handler code:
ISR(USART_RXC_vect) // USART receive vector
{
FCM_%n(); // Call Flowcode Macro
}
Analogue Comparator
Enable code:
SFIOR &= ~(1 << ACME); // disable multiplexer input
ACSR |= (1 << ACIE); // enable comparator interrupts - interrupt when comparator output toggles
Disable code:
ACSR &= ~(1 << ACIE); // disable comparator interrupts
Handler code:
ISR(ANA_COMP_vect) // analogue comparator interrupt vector
{
FCM_%n(); // Call Flowcode Macro
}
The state of the comparator input can be read into a Flowcode variable 'compstate' with the following C code line:
FCV_COMPSTATE = ACSR & (1 << ACO);
Timer1 Rollover
Enable code:
TCCR1B = 0x45; // positive edge trigger with no noise canceler, prescaler = /1024
TIMSK |= (1 << TICIE1); // enable input capture interrupts
Disable code:
TIMSK &= ~(1 << TICIE1); // disable input capture interrupts
Handler code:
ISR(TIMER1_CAPT_vect) // input capture vector
{
FCM_%n(); // Call Flowcode Macro
}
The captured 16-bit count value can be read into a Flowcode variable 'captval' with the following C code line:
FCV_CAPTVAL = ICR1;
** captval must be declared as an integer variable ** |
