0,0 → 1,204 |
#include "defines.h" |
#include "interrupts.h" |
#include "uart.h" |
#include "i2c.h" |
#include "spi.h" |
#include "adc.h" |
#include "timers.h" |
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//---------------------------------------------------------------------------- |
// Note: This code for processing interrupts is configured to allow for high and |
// low priority interrupts. The high priority interrupt can interrupt the |
// the processing of a low priority interrupt. However, only one of each type |
// can be processed at the same time. It is possible to enable nesting of low |
// priority interrupts, but this code is not setup for that and this nesting |
// is not enabled. |
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void Interrupt_Init() { |
// Peripheral interrupts can have their priority set to high or low |
// Decide on the priority of the enabled peripheral interrupts (0 is low, 1 is high) |
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// High priority interrupts |
IPR1bits.RC1IP = 1; // USART1 RX interrupt |
IPR1bits.TX1IP = 1; // USART1 TX interrupt |
// IPR3bits.RC2IP = 1; // USART2 RX interrupt |
IPR1bits.SSPIP = 1; // I2C interrupt |
IPR3bits.SSP2IP = 1; // MSSP2 (SPI2) interrupt |
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// Low priority interrupts |
// INTCON2bits.TMR0IP = 0; // Timer0 interrupt |
IPR1bits.TMR1IP = 0; // Timer1 interrupt |
// IPR2bits.TMR3IP = 0; // Timer 3 interrupt |
// IPR1bits.ADIP = 0; // ADC interupt |
// INTCON2bits.RBIP = 0; // Port B interrupt |
// INTCON3bits.INT1IP = 0; // INT1 interrupt |
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// Enable Port B interrupt |
// INTCONbits.RBIE = 1; |
// Enable interrupt for INT1 |
// INTCON3bits.INT1IE = 1; |
} |
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void Interrupt_Enable() { |
// Peripheral interrupts can have their priority set to high or low. |
// Enable both high-priority interrupts and low-priority interrupts |
RCONbits.IPEN = 1; |
INTCONbits.GIEH = 1; |
INTCONbits.GIEL = 1; |
} |
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void Interrupt_Disable() { |
RCONbits.IPEN = 0; |
INTCONbits.GIEH = 0; |
INTCONbits.GIEL = 0; |
} |
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// Set up the interrupt vectors |
void InterruptHandlerHigh(); |
void InterruptHandlerLow(); |
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#pragma code InterruptVectorLow = 0x18 |
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void InterruptVectorLow(void) { |
_asm |
goto InterruptHandlerLow //jump to interrupt routine |
_endasm |
} |
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#pragma code InterruptVectorHigh = 0x08 |
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void InterruptVectorHigh(void) { |
_asm |
goto InterruptHandlerHigh //jump to interrupt routine |
_endasm |
} |
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//---------------------------------------------------------------------------- |
// High priority interrupt routine |
// this parcels out interrupts to individual handlers |
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#pragma code |
#pragma interrupt InterruptHandlerHigh |
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void InterruptHandlerHigh() { |
// We need to check the interrupt flag of each enabled high-priority interrupt to |
// see which device generated this interrupt. Then we can call the correct handler. |
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// // Check to see if we have an SPI2 interrupt |
// if (PIR3bits.SSP2IF) { |
// // Call the handler |
// SPI2_Recv_Interrupt_Handler(); |
// |
// // Clear the interrupt flag |
// PIR3bits.SSP2IF = 0; |
// |
// return; |
// } |
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// Check to see if we have an I2C interrupt |
if (PIR1bits.SSPIF) { |
// Call the handler |
I2C_Interrupt_Handler(); |
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// Clear the interrupt flag |
PIR1bits.SSPIF = 0; |
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return; |
} |
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// Check to see if we have an interrupt on USART1 RX |
if (PIR1bits.RC1IF) { |
// Call the interrupt handler |
UART1_Recv_Interrupt_Handler(); |
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// Clear the interrupt flag |
PIR1bits.RC1IF = 0; |
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return; |
} |
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#ifndef _DEBUG // Disable UART1 TX interrupt for debug mode (using printf) |
// Check to see if we have an interrupt on USART1 TX |
if (PIR1bits.TX1IF) { |
// Call the interrupt handler |
UART1_Send_Interrupt_Handler(); |
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// Clear the interrupt flag |
PIR1bits.TX1IF = 0; |
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return; |
} |
#endif |
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// // Check to see if we have an interrupt on USART2 RX |
// if (PIR3bits.RC2IF) { |
// DBG_PRINT_INT("INT: UART2 RX\r\n"); |
// // Call the interrupt handler |
// uart_2_recv_interrupt_handler(); |
// |
// // Clear the interrupt flag |
// PIR3bits.RC2IF = 0; |
// } |
} |
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//---------------------------------------------------------------------------- |
// Low priority interrupt routine |
// this parcels out interrupts to individual handlers |
#pragma code |
#pragma interruptlow InterruptHandlerLow |
// This works the same way as the "High" interrupt handler |
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void InterruptHandlerLow() { |
// // Check to see if we have an interrupt on INT1 |
// if (INTCON3bits.INT1IF) { |
// DBG_PRINT_INT("INT: INT1\r\n"); |
// int1_interrupt_handler(); |
// |
// INTCON3bits.INT1IF = 0; |
// } |
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// // Check to see if we have an interrupt on any port B inputs <4:7> |
// if (INTCONbits.RBIF) { |
// DBG_PRINT_INT("INT: Port B\r\n"); |
// port_b_int_interrupt_handler(); |
// |
// INTCONbits.RBIF = 0; |
// } |
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// // Check to see if we have an interrupt on timer 0 |
// if (INTCONbits.TMR0IF) { |
// DBG_PRINT_INT("INT: Timer 0\r\n"); |
// // Call the handler |
// timer0_interrupt_handler(); |
// |
// // Clear this interrupt flag |
// INTCONbits.TMR0IF = 0; |
// } |
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// Check to see if we have an interrupt on timer 1 |
if (PIR1bits.TMR1IF) { |
// Call the interrupt handler |
Timer1_Interrupt_Handler(); |
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// Clear the interrupt flag |
PIR1bits.TMR1IF = 0; |
} |
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// // Check to see if we have an interrupt on timer 3 |
// if (PIR2bits.TMR3IF) { |
// DBG_PRINT_INT("INT: Timer 3\r\n"); |
// timer3_interrupt_handler(); |
// |
// PIR2bits.TMR3IF = 0; |
// } |
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// // Check to see if we have an interrupt on ADC |
// if (PIR1bits.ADIF) { |
// // Call the interrupt handler |
// ADC_Interrupt_Handler(); |
// |
// // Clear the interrupt flag |
// PIR1bits.ADIF = 0; |
// } |
} |
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