280049C有40个GPIO口,但在复杂应用中可能仍然不够。为了进一步增强DSP功能,28004x系列支持将ADC引脚复用为AIO,用于读取数字信号。
官方例程中在C:\ti\C2000Ware_DigitalPower_SDK_3_00_01_00\c2000ware\driverlib\f28004x\examples\gpio 中提供了gpio_ex4_aio_external_interrupt 可供参考
//#############################################################################
//
// FILE: gpio_ex4_aio_external_interrupt.c
//
// TITLE: Configure Analog IO (AIO) pin as External Interrupt (XINT)
//
//! \addtogroup driver_example_list
//! <h1>External Interrupt (XINT)</h1>
//!
//! In this example AIO pins are configured as digital inputs. Two other GPIO
//! signals (connected externally to AIO pins) are toggled in software to
//! trigger external interrupt through AIO224 and AIO225 (AIO224 assigned to
//! XINT1 and AIO225 assigned to XINT2). The user is required to externally
//! connect these signals for the program to work properly. Each interrupt
//! is fired in sequence: XINT1 first and then XINT2.
//!
//! GPIO34 will go high outside of the interrupts and low within the
//! interrupts. This signal can be monitored on a scope.
//!
//! \b External \b Connections \n
//! - Connect GPIO30 to AIO224. AIO224 will be assigned to XINT1
//! - Connect GPIO31 to AIO225. AIO225 will be assigned to XINT2
//! - GPIO34 can be monitored on an oscilloscope
//!
//! \b Watch \b Variables \n
//! - xint1Count for the number of times through XINT1 interrupt
//! - xint2Count for the number of times through XINT2 interrupt
//! - loopCount for the number of times through the idle loop
//!
//
//#############################################################################
// $TI Release: F28004x Support Library v1.10.00.00 $
// $Release Date: Tue May 26 17:06:03 IST 2020 $
// $Copyright:
// Copyright (C) 2020 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 "driverlib.h"
#include "device.h"
//
// Defines
//
// Qualification period at 6 samples in microseconds
#define DELAY (6.0 * 510.0 * 1000000.0 * (1.0 / DEVICE_SYSCLK_FREQ))
//
// Globals
//
volatile uint32_t xint1Count = 0;
volatile uint32_t xint2Count = 0;
uint32_t loopCount = 0;
//
// Function Prototypes
//
__interrupt void xint1ISR(void);
__interrupt void xint2ISR(void);
//
// Main
//
void main(void)
{
uint32_t xint1CountTemp;
uint32_t xint2CountTemp;
//
// Initialize device clock and peripherals
//
Device_init();
//
// Disable pin locks and enable internal pullups.
//
Device_initGPIO();
//
// Initialize PIE and clear PIE registers. Disables CPU interrupts.
//
Interrupt_initModule();
//
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
//
Interrupt_initVectorTable();
//
// Interrupts that are used in this example are re-mapped to ISR functions
// found within this file.
//
Interrupt_register(INT_XINT1, &xint1ISR);
Interrupt_register(INT_XINT2, &xint2ISR);
//
// Enable XINT interrupts
//
Interrupt_enable(INT_XINT1);
Interrupt_enable(INT_XINT2);
//
// Enable Global Interrupt (INTM) and realtime interrupt (DBGM)
//
EINT;
ERTM;
//
// GPIO30 & GPIO31 are outputs that will trigger the interrupts through
// AIO224 and AIO225. Starting with GPIO30 as high and GPIO31 as low.
//
GPIO_writePin(30, 1);
GPIO_setPinConfig(GPIO_30_GPIO30);
GPIO_setDirectionMode(30, GPIO_DIR_MODE_OUT);
GPIO_writePin(31, 0);
GPIO_setPinConfig(GPIO_31_GPIO31);
GPIO_setDirectionMode(31, GPIO_DIR_MODE_OUT);
//
// AIO224 and AIO225 are inputs and the pins tied to the external interrupts.
// AIO224 will be synchronous to SYSCLKOUT only. AIO225 will use a
// qualification mode of 6 samples. Configure AIO in digital input mode.
// These AIO pins do not have digital output capability. Setting direction
// of the AIO pin is not required.
//
GPIO_setPinConfig(GPIO_224_GPIO224);
GPIO_setAnalogMode(224, GPIO_ANALOG_DISABLED);
GPIO_setQualificationMode(224, GPIO_QUAL_SYNC);
GPIO_setPinConfig(GPIO_225_GPIO225);
GPIO_setAnalogMode(225, GPIO_ANALOG_DISABLED);
GPIO_setQualificationMode(225, GPIO_QUAL_6SAMPLE);
//
// Each sampling window will be 510 SYSCLKOUT cycles. Note that this
// function actually sets the qualification period for GPIOs 0 through 7
// (if they are using qualification).
//
GPIO_setQualificationPeriod(225, 510);
//
// Select AIO224 as XINT1 and AIO225 as XINT2
//
GPIO_setInterruptPin(224, GPIO_INT_XINT1);
GPIO_setInterruptPin(225, GPIO_INT_XINT2);
//
// Configure XINT1 to be a triggered by a falling edge and XINT2 to be
// triggered by a rising edge.
//
GPIO_setInterruptType(GPIO_INT_XINT1, GPIO_INT_TYPE_FALLING_EDGE);
GPIO_setInterruptType(GPIO_INT_XINT2, GPIO_INT_TYPE_RISING_EDGE);
//
// Enable XINT1 and XINT2
//
GPIO_enableInterrupt(GPIO_INT_XINT1);
GPIO_enableInterrupt(GPIO_INT_XINT2);
//
// GPIO34 will go low inside each interrupt. Monitor this on a scope.
//
GPIO_setPinConfig(GPIO_34_GPIO34);
GPIO_setDirectionMode(34, GPIO_DIR_MODE_OUT);
//
// Loop indefinitely
//
while(1)
{
xint1CountTemp = xint1Count;
xint2CountTemp = xint2Count;
//
// Trigger XINT1
//
GPIO_writePin(34, 1); // GPIO34 is high
GPIO_writePin(30, 0); // Lower GPIO30, trigger XINT1
//
// Wait until ISR has finished
//
while(xint1Count == xint1CountTemp)
{
;
}
//
// Trigger XINT2
//
GPIO_writePin(34, 1); // GPIO34 is high
DEVICE_DELAY_US(DELAY); // Wait for qual period
GPIO_writePin(31, 1); // Raise GPIO31, trigger XINT2
//
// Wait until ISR has finished
//
while(xint2Count == xint2CountTemp)
{
;
}
//
// Check that the counts were incremented properly and get ready
// to start over.
//
if((xint1Count == (xint1CountTemp + 1)) &&
(xint2Count == (xint2CountTemp + 1)))
{
loopCount++;
GPIO_writePin(30, 1); // Raise GPIO30
GPIO_writePin(31, 0); // Lower GPIO31
}
else
{
//
// Something went wrong
//
ESTOP0;
}
}
}
//
// xint1ISR - XINT1 ISR
//
__interrupt void xint1ISR(void)
{
//
// Lower GPIO34 and increment interrupt count
//
GPIO_writePin(34, 0);
xint1Count++;
//
// Acknowledge the interrupt
//
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP1);
}
//
// xint2ISR - XINT2 ISR
//
__interrupt void xint2ISR(void)
{
//
// Lower GPIO34 and increment interrupt count
//
GPIO_writePin(34, 0);
xint2Count++;
//
// Acknowledge the interrupt
//
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP1);
}
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