60 lines
2.5 KiB
C
60 lines
2.5 KiB
C
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/* EdgeTriggered.c
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* Jonathan Valvano
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* July 19, 2025
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* Derived
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* Derived from gpio_toggle_output_LP_MSPM0G3507_nortos_ticlang
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* gpio_input_capture_LP_MSPM0G3507_nortos_ticlang
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* Will invoke LaunchPad_Init
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*/
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/*
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* Copyright (c) 2021, Texas Instruments Incorporated
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* All rights reserved.
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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 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 "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <ti/devices/msp/msp.h>
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#include "../inc/EdgeTriggered.h"
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#include "../inc/LaunchPad.h"
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// PB21 is S3 negative logic switch, index 48 in IOMUX PINCM table
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// Arm interrupts on fall of PB21
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// interrupts will be enabled in main after all initialization
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void EdgeTriggered_Init(void){
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LaunchPad_Init(); // PB21 is input with internal pull up resistor
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GPIOB->POLARITY31_16 = 0x00000800; // falling
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GPIOB->CPU_INT.ICLR = 0x00200000; // clear bit 21
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GPIOB->CPU_INT.IMASK = 0x00200000; // arm PB21
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NVIC->IP[0] = (NVIC->IP[0]&(~0x0000FF00))|2<<14; // set priority (bits 15,14) IRQ 1
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NVIC->ISER[0] = 1 << 1; // Group1 interrupt
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}
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