topic Re: problem in GPIO reading in LPC Microcontrollers

problem in GPIO reading

aravindpb5009 — Mon, 29 Jul 2019 14:39:07 GMT

I try to read a gipo pin status either 0 or 1 in digital form but when i try to read my assigned pin was not getting o/p

please let me know the solution . in below i provided the code

/*
* Copyright (c) 2016, Freescale Semiconductor, Inc.
* Copyright 2016-2019 NXP
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/

/* Standard C Included Files */
#include <stdio.h>
#include <string.h>
#include "board.h"
#include "fsl_debug_console.h"
#include "fsl_i2c.h"
#include "fsl_i2c.h"
#include <stdlib.h>
#include <string.h>
#include "pin_mux.h"
#include "fsl_device_registers.h"
#include "fsl_common.h"
#include"lpc8xx_i2c.h"
#include"fsl_usart.h"
/*******************************************************************************
* Definitions
******************************************************************************/

#define BOARD_LED_PIN 23U
#define SWITCH_PORT 0U
#define SWITCH_PIN 28U

static void EXAMPLE_USARTInit(void);
void delay_ms(int a);

int main(void)
{

gpio_pin_config_t led_config = {kGPIO_DigitalOutput, 0,};
gpio_pin_config_t SWITCH_config = { kGPIO_DigitalInput, 0,};

GPIO_PortInit(GPIO, BOARD_LED_PORT);
GPIO_PinInit(GPIO, BOARD_LED_PORT, BOARD_LED_PIN, &led_config);

GPIO_PortInit(GPIO, SWITCH_PORT);
GPIO_PinInit(GPIO, SWITCH_PORT, SWITCH_PIN, & SWITCH_config);

while(1)
{
while(GPIO_PinRead(GPIO,SWITCH_PORT, 1u << SWITCH_PIN)==1);

GPIO_PortToggle(GPIO, BOARD_LED_PORT, 1u << BOARD_LED_PIN);

} // end of while 1

} // end of main

static inline uint32_t GPIO_PinRead(GPIO_Type *base, uint32_t port, uint32_t pin)
{
return (uint32_t)base->B[port][pin];
}

Re: problem in GPIO reading

Sabina_Bruce — Mon, 29 Jul 2019 15:56:26 GMT

Hello Aranvind,

In order for me to better assist you, can you please confirm the microcontroller that you are using.

Thank you,

Sabina

Re: problem in GPIO reading

aravindpb5009 — Tue, 30 Jul 2019 08:12:29 GMT

LPC824, Mcuxpresso IDE

Thanks& Regards

Aravind P

Re: problem in GPIO reading

Sabina_Bruce — Tue, 30 Jul 2019 14:49:25 GMT

Hello Aravind,

After checking your code, I dont see where the clock for the port is being initialized. Please try to enable to correct clock for the led and switch you are using.

If you would like to see an example, you can use the LPCXpresso824max_gpio_led_ouput example which is available in the SDK.

This example uses a switch to toggle a led just as you are doing.

You can download the sdk here.

Best Regards,

Sabina