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css_cmake_test/f2833x/examples/external_interrupt/Example_2833xExternalInterrupt.c

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//###########################################################################
//
// FILE: Example_2833xExternalInterrupt.c
//
// TITLE: External Interrupt Example
//
//! \addtogroup f2833x_example_list
//! <h1>External Interrupt (external_interrupt)</h1>
//!
//! This program sets up GPIO0 as XINT1 and GPIO1 as XINT2. Two other
//! GPIO signals are used to trigger the interrupt (GPIO30 triggers
//! XINT1 and GPIO31 triggers XINT2). XINT1 input is synched to SYSCLKOUT
//! XINT2 has a long qualification - 6 samples at 510*SYSCLKOUT each.
//! GPIO34 will go high outside of the interrupts and low within the
//! interrupts. This signal can be monitored on a scope.
//! Each interrupt is fired in sequence - XINT1 first and then XINT2.
//!
//! Monitor GPIO34 with an oscilloscope. GPIO34 will be high outside of
//! the ISRs and low within each ISR.
//!
//! \b External \b Connections \n
//! - Connect GPIO30 to GPIO0. GPIO0 is assigned to XINT1
//! - Connect GPIO31 to GPIO1. GPIO1 is assigned to XINT2
//!
//! \b Watch \b Variables \n
//! - Xint1Count - XINT1 interrupt count
//! - Xint2Count - XINT2 interrupt count
//! - LoopCount - Idle loop count
//
//###########################################################################
// $TI Release: $
// $Release Date: $
// $Copyright:
// Copyright (C) 2009-2023 Texas Instruments Incorporated - http://www.ti.com/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the
// distribution.
//
// Neither the name of Texas Instruments Incorporated nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// $
//###########################################################################
//
// Included Files
//
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
//
// Function Prototypes
//
__interrupt void xint1_isr(void);
__interrupt void xint2_isr(void);
//
// Globals
//
volatile Uint32 Xint1Count;
volatile Uint32 Xint2Count;
Uint32 LoopCount;
//
// Defines
//
#define DELAY 35.700L
//
// Main
//
void main(void)
{
Uint32 TempX1Count;
Uint32 TempX2Count;
//
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
//
InitSysCtrl();
//
// Step 2. Initialize GPIO:
// This example function is found in the DSP2833x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
//
// InitGpio(); // Skipped for this example
//
// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
//
DINT;
//
// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2833x_PieCtrl.c file.
//
InitPieCtrl();
//
// Disable CPU interrupts and clear all CPU interrupt flags
//
IER = 0x0000;
IFR = 0x0000;
//
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example. This is useful for debug purposes.
// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_PieVect.c.
//
InitPieVectTable();
//
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
//
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.XINT1 = &xint1_isr;
PieVectTable.XINT2 = &xint2_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
//
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2833x_InitPeripherals.c
//
// InitPeripherals(); // Not required for this example
//
// Step 5. User specific code, enable interrupts
//
//
// Clear the counters
//
Xint1Count = 0; // Count Xint1 interrupts
Xint2Count = 0; // Count XINT2 interrupts
LoopCount = 0; // Count times through idle loop
//
// Enable Xint1 and XINT2 in the PIE: Group 1 interrupt 4 & 5
// Enable int1 which is connected to WAKEINT:
//
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER1.bit.INTx4 = 1; // Enable PIE Group 1 INT4
PieCtrlRegs.PIEIER1.bit.INTx5 = 1; // Enable PIE Group 1 INT5
IER |= M_INT1; // Enable CPU int1
EINT; // Enable Global Interrupts
//
// GPIO30 & GPIO31 are outputs, start GPIO30 high and GPIO31 low
//
EALLOW;
GpioDataRegs.GPASET.bit.GPIO30 = 1; // Load the output latch
GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 0; // GPIO
GpioCtrlRegs.GPADIR.bit.GPIO30 = 1; // output
GpioDataRegs.GPACLEAR.bit.GPIO31 = 1; // Load the output latch
GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 0; // GPIO
GpioCtrlRegs.GPADIR.bit.GPIO31 = 1; // output
EDIS;
//
// GPIO0 and GPIO1 are inputs
//
EALLOW;
GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 0; // GPIO
GpioCtrlRegs.GPADIR.bit.GPIO0 = 0; // input
GpioCtrlRegs.GPAQSEL1.bit.GPIO0 = 0; // Xint1 Synch to SYSCLKOUT only
GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 0; // GPIO
GpioCtrlRegs.GPADIR.bit.GPIO1 = 0; // input
GpioCtrlRegs.GPAQSEL1.bit.GPIO1 = 2; // XINT2 Qual using 6 samples
//
// Each sampling window is 510*SYSCLKOUT
//
GpioCtrlRegs.GPACTRL.bit.QUALPRD0 = 0xFF;
EDIS;
//
// GPIO0 is XINT1, GPIO1 is XINT2
//
EALLOW;
GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 0; // Xint1 is GPIO0
GpioIntRegs.GPIOXINT2SEL.bit.GPIOSEL = 1; // XINT2 is GPIO1
EDIS;
//
// Configure XINT1
//
XIntruptRegs.XINT1CR.bit.POLARITY = 0; // Falling edge interrupt
XIntruptRegs.XINT2CR.bit.POLARITY = 1; // Rising edge interrupt
//
// Enable XINT1 and XINT2
//
XIntruptRegs.XINT1CR.bit.ENABLE = 1; // Enable Xint1
XIntruptRegs.XINT2CR.bit.ENABLE = 1; // Enable XINT2
//
// GPIO34 will go low inside each interrupt. Monitor this on a scope
//
EALLOW;
GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0; // GPIO
GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1; // output
EDIS;
//
// Step 6. IDLE loop
//
for(;;)
{
TempX1Count = Xint1Count;
TempX2Count = Xint2Count;
//
// Trigger both XINT1
//
GpioDataRegs.GPBSET.bit.GPIO34 = 1; // GPIO34 is high
GpioDataRegs.GPACLEAR.bit.GPIO30 = 1; // Lower GPIO30, trigger Xint1
while(Xint1Count == TempX1Count)
{
}
//
// Trigger both XINT2
//
GpioDataRegs.GPBSET.bit.GPIO34 = 1; // GPIO34 is high
DELAY_US(DELAY); // Wait for Qual period
GpioDataRegs.GPASET.bit.GPIO31 = 1; // Raise GPIO31, trigger XINT2
while(Xint2Count == TempX2Count)
{
}
//
// Check that the counts were incremented properly and get ready
// to start over.
//
if(Xint1Count == TempX1Count+1 && Xint2Count == TempX2Count+1)
{
LoopCount++;
GpioDataRegs.GPASET.bit.GPIO30 = 1; // raise GPIO30
GpioDataRegs.GPACLEAR.bit.GPIO31 = 1; // lower GPIO31
}
else
{
__asm(" ESTOP0"); // stop here
}
}
}
//
// Step 7. Insert all local Interrupt Service Routines (ISRs) and
// functions here
//
//
// Note: If local ISRs are used, reassign vector addresses in vector table as
// shown in Step 5
//
//
// xint1_isr -
//
__interrupt void
xint1_isr(void)
{
GpioDataRegs.GPBCLEAR.all = 0x4; // GPIO34 is low
Xint1Count++;
//
// Acknowledge this interrupt to get more from group 1
//
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
//
// xint2_isr -
//
__interrupt void
xint2_isr(void)
{
GpioDataRegs.GPBCLEAR.all = 0x4; // GPIO34 is low
Xint2Count++;
//
// Acknowledge this interrupt to get more from group 1
//
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
//
// End of File
//
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