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