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gpio.cpp
- Committer:
- pmallick
- Date:
- 2021-09-27
- Revision:
- 19:ed7c2dac92bd
- Parent:
- 17:af1f2416dd26
File content as of revision 19:ed7c2dac92bd:
/***************************************************************************//** * @file gpio.cpp * @brief Implementation of GPIO Mbed platform driver interfaces ******************************************************************************** * Copyright (c) 2019 - 2021 Analog Devices, Inc. * All rights reserved. * * This software is proprietary to Analog Devices, Inc. and its licensors. * By using this software you agree to the terms of the associated * Analog Devices Software License Agreement. *******************************************************************************/ /******************************************************************************/ /************************ Includes Files *******************************/ /******************************************************************************/ #include <stdio.h> #include <stdlib.h> #include <mbed.h> // Platform drivers needs to be C-compatible to work with other drivers #ifdef __cplusplus extern "C" { #endif // _cplusplus #include "error.h" #include "gpio.h" #include "gpio_extra.h" /******************************************************************************/ /************************ Functions Definitions *******************************/ /******************************************************************************/ /** * @brief Obtain the GPIO decriptor. * @param desc - The GPIO descriptor. * @param gpio_number - The number of the GPIO. * @return SUCCESS in case of success, FAILURE otherwise. */ int32_t gpio_get(struct gpio_desc **desc, const struct gpio_init_param *param) { gpio_desc *new_gpio; if (desc && param) { // Create the gpio description object for the device new_gpio = (gpio_desc *)calloc(1, sizeof(gpio_desc)) ; if (!new_gpio) { goto err_new_gpio; } new_gpio->number = param->number; // Create the gpio extra descriptor object to store extra mbed gpio info mbed_gpio_desc *gpio_desc_extra = (mbed_gpio_desc *)calloc(1, sizeof(mbed_gpio_desc)); if (!gpio_desc_extra) { goto err_gpio_desc_extra; } gpio_desc_extra->direction = GPIO_IN; gpio_desc_extra->gpio_pin = NULL; if (param->extra) { gpio_desc_extra->pin_mode = ((mbed_gpio_init_param *)param->extra)->pin_mode; } else { gpio_desc_extra->pin_mode = NULL; } new_gpio->extra = gpio_desc_extra; *desc = new_gpio; return SUCCESS; } err_gpio_desc_extra: free(new_gpio); err_new_gpio: // Nothing to free return FAILURE; } /** * @brief Get the value of an optional GPIO. * @param desc - The GPIO descriptor. * @param param - GPIO Initialization parameters. * @return SUCCESS in case of success, FAILURE otherwise. */ int32_t gpio_get_optional(struct gpio_desc **desc, const struct gpio_init_param *param) { if (param) { return gpio_get(desc, param); } else { *desc = NULL; return SUCCESS; } } /** * @brief Free the resources allocated by gpio_get(). * @param desc - The GPIO descriptor. * @return SUCCESS in case of success, FAILURE otherwise. */ int32_t gpio_remove(struct gpio_desc *desc) { if (desc) { // Free the gpio object if(((mbed_gpio_desc *)(desc->extra))->gpio_pin) { free(((mbed_gpio_desc *)(desc->extra))->gpio_pin); } // Free the gpio extra descriptor object if((mbed_gpio_desc *)(desc->extra)) { free((mbed_gpio_desc *)(desc->extra)); } // Free the gpio descriptor object free(desc); return SUCCESS; } return FAILURE; } /** * @brief Enable the input direction of the specified GPIO. * @param desc - The GPIO descriptor. * @return SUCCESS in case of success, FAILURE otherwise. * @note does not support reconfiguration of already set pin direction */ int32_t gpio_direction_input(struct gpio_desc *desc) { DigitalIn *gpio_input; // pointer to gpio input object mbed_gpio_desc *gpio_desc_extra; // pointer to gpio desc extra parameters if (desc && desc->extra) { gpio_desc_extra = (mbed_gpio_desc *)(desc->extra); if (gpio_desc_extra->gpio_pin == NULL) { // Configure and instantiate GPIO pin as input gpio_input = new DigitalIn((PinName)desc->number); if (!gpio_input) { goto err_gpio_input; } gpio_desc_extra->gpio_pin = (mbed_gpio_desc *)gpio_input; gpio_desc_extra->direction = GPIO_IN; // Set the gpio pin mode gpio_input->mode((PinMode)((mbed_gpio_desc *)desc->extra)->pin_mode); return SUCCESS; } } err_gpio_input: // Nothing to free return FAILURE; } /** * @brief Enable the output direction of the specified GPIO. * @param desc - The GPIO descriptor. * @param value - The value. * Example: GPIO_HIGH * GPIO_LOW * @return SUCCESS in case of success, FAILURE otherwise. * @note does not support reconfiguration of already set pin direction */ int32_t gpio_direction_output(struct gpio_desc *desc, uint8_t value) { DigitalOut *gpio_output; // pointer to gpio output object mbed_gpio_desc *gpio_desc_extra; // pointer to gpio desc extra parameters if(desc && desc->extra) { gpio_desc_extra = (mbed_gpio_desc *)(desc->extra); if (gpio_desc_extra->gpio_pin == NULL) { // Configure and instantiate GPIO pin as output gpio_output = new DigitalOut((PinName)desc->number); if (!gpio_output) { goto err_gpio_output; } gpio_desc_extra->gpio_pin = (mbed_gpio_desc *)gpio_output; gpio_desc_extra->direction = GPIO_OUT; // Set the GPIO value if(gpio_set_value(desc, value) == SUCCESS) { return SUCCESS; } } } err_gpio_output: // Nothing to free return FAILURE; } /** * @brief Get the direction of the specified GPIO. * @param desc - The GPIO descriptor. * @param direction - The direction. * Example: GPIO_OUT * GPIO_IN * @return SUCCESS in case of success, FAILURE otherwise. */ int32_t gpio_get_direction(struct gpio_desc *desc, uint8_t *direction) { mbed_gpio_desc *gpio_desc_extra; // pointer to gpio desc extra parameters if(desc && desc->extra) { gpio_desc_extra = (mbed_gpio_desc *)(desc->extra); if (gpio_desc_extra->gpio_pin) { *direction = gpio_desc_extra->direction; } return SUCCESS; } return FAILURE; } /** * @brief Set the value of the specified GPIO. * @param desc - The GPIO descriptor. * @param value - The value. * Example: GPIO_HIGH * GPIO_LOW * @return SUCCESS in case of success, FAILURE otherwise. */ int32_t gpio_set_value(struct gpio_desc *desc, uint8_t value) { DigitalOut *gpio_output; // pointer to gpio output object mbed_gpio_desc *gpio_desc_extra; // pointer to gpio desc extra parameters if(desc && desc->extra) { gpio_desc_extra = (mbed_gpio_desc *)(desc->extra); if (gpio_desc_extra->gpio_pin) { gpio_output = (DigitalOut *)((mbed_gpio_desc *)desc->extra)->gpio_pin; gpio_output->write(value); } return SUCCESS; } return FAILURE; } /** * @brief Get the value of the specified GPIO. * @param desc - The GPIO descriptor. * @param value - The value. * Example: GPIO_HIGH * GPIO_LOW * @return SUCCESS in case of success, FAILURE otherwise. */ int32_t gpio_get_value(struct gpio_desc *desc, uint8_t *value) { DigitalIn *gpio_input; // pointer to gpio input object uint8_t returnVal = FAILURE; if (desc && desc->extra) { gpio_input = (DigitalIn *)((mbed_gpio_desc *)desc->extra)->gpio_pin; *value = (uint8_t)gpio_input->read(); returnVal = gpio_input->is_connected() ? SUCCESS : FAILURE; return returnVal; } return FAILURE; } #ifdef __cplusplus } #endif // _cplusplus