Diff: src/gpio.cpp

Revision:

9:9e247b9c9abf

Parent:

8:70fc373a5f46

--- a/src/gpio.cpp	Wed Feb 26 06:09:13 2020 +0000
+++ b/src/gpio.cpp	Mon Jun 15 13:03:55 2020 +0000
@@ -15,6 +15,7 @@
 /************************ Includes Files *******************************/
 /******************************************************************************/
 #include <stdio.h>
+#include <stdlib.h>
 #include <mbed.h>
 
 #include "platform_drivers.h"
@@ -30,16 +31,29 @@
  * @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 gpio_init_param *param)
+int32_t gpio_get(struct gpio_desc **desc, const struct gpio_init_param *param)
 {
-	if (desc) {
+	if (desc && param) {
 		// Create the gpio description object for the device
-		gpio_desc *new_gpio = (gpio_desc *)malloc(sizeof(gpio_desc));
+		gpio_desc *new_gpio = (gpio_desc *)calloc(1, sizeof(gpio_desc)) ;
 		if (new_gpio == NULL) {
 			return FAILURE;
 		}
 
+		// 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 == NULL) {
+			return FAILURE;
+		}
+
 		new_gpio->number = param->number;
+		new_gpio->extra = gpio_desc_extra;
+
+		gpio_desc_extra->direction = GPIO_IN;
+		gpio_desc_extra->gpio_pin = NULL;
+		gpio_desc_extra->pin_mode = ((mbed_gpio_init_param *)(*desc)->extra)->pin_mode;
+
 		*desc = new_gpio;
 
 		return SUCCESS;
@@ -50,6 +64,24 @@
 
 
 /**
+ * @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.
@@ -58,12 +90,12 @@
 {
 	if (desc) {
 		// Free the gpio object
-		if (((mbed_gpio_desc *)(desc->extra))->gpio_pin) {
+		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)) {
+		if((mbed_gpio_desc *)(desc->extra)) {
 			free((mbed_gpio_desc *)(desc->extra));
 		}
 
@@ -81,32 +113,30 @@
  * @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) {
-		// Configure and instantiate GPIO pin as input
-		gpio_input = new DigitalIn((PinName)desc->number);
-		if (gpio_input == NULL) {
-			return FAILURE;
-		}
+	DigitalIn *gpio_input;   	// pointer to gpio input object
+	mbed_gpio_desc *gpio_desc_extra;   // pointer to gpio desc extra parameters
 
-		// Create the gpio extra descriptor object to store new gpio instance
-		gpio_desc_extra = (mbed_gpio_desc *)malloc(sizeof(mbed_gpio_desc));
-		if (gpio_desc_extra == NULL) {
-			return FAILURE;
-		}
+	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 == NULL) {
+				return FAILURE;
+			}
 
-		gpio_desc_extra->gpio_pin = (mbed_gpio_desc *)gpio_input;
-		desc->extra = (mbed_gpio_desc *)gpio_desc_extra;
+			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_init_param *)desc->extra)->pin_mode);
+			// Set the gpio pin mode
+			gpio_input->mode((PinMode)((mbed_gpio_desc *)desc->extra)->pin_mode);
 
-		return SUCCESS;
+			return SUCCESS;
+		}
 	}
 
 	return FAILURE;
@@ -120,33 +150,32 @@
  *                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
+	DigitalOut *gpio_output;    	// pointer to gpio output object
+	mbed_gpio_desc *gpio_desc_extra;   // pointer to gpio desc extra parameters
 
-	if(desc) {
-		// Configure and instantiate GPIO pin as output
-		gpio_output = new DigitalOut((PinName)desc->number);
-		if (gpio_output == NULL) {
-			return FAILURE;
-		}
+	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);
 
-		// Create the gpio extra descriptor object to store new gpio instance
-		gpio_desc_extra = (mbed_gpio_desc *)malloc(sizeof(mbed_gpio_desc));
-		if (gpio_desc_extra == NULL) {
-			return FAILURE;
-		}
+			if (gpio_output == NULL) {
+				return FAILURE;
+			}
 
-		gpio_desc_extra->gpio_pin = (mbed_gpio_desc *)gpio_output;
-		desc->extra = (mbed_gpio_desc *)gpio_desc_extra;
+			gpio_desc_extra->gpio_pin = (mbed_gpio_desc *)gpio_output;
+			gpio_desc_extra->direction = GPIO_OUT;
 
-		return SUCCESS;
-	}
-
-	if (value) {
-		// Unused variable - fix compiler warning
+			// Set the GPIO value
+			if(gpio_set_value(desc, value) == SUCCESS) {
+				return SUCCESS;
+			}
+		}
 	}
 
 	return FAILURE;
@@ -163,15 +192,19 @@
  */
 int32_t gpio_get_direction(struct gpio_desc *desc, uint8_t *direction)
 {
-	if (desc) {
-		// Unused variable - fix compiler warning
+	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;
 	}
 
-	if (direction) {
-		// Unused variable - fix compiler warning
-	}
-
-	return SUCCESS;
+	return FAILURE;
 }
 
 
@@ -185,19 +218,20 @@
  */
 int32_t gpio_set_value(struct gpio_desc *desc, uint8_t value)
 {
-	DigitalOut *gpio_output;		// pointer to gpio output object
+	DigitalOut *gpio_output; 		// pointer to gpio output object
+	mbed_gpio_desc *gpio_desc_extra;    // pointer to gpio desc extra parameters
 
-	if (desc) {
-		gpio_output = (DigitalOut *)((mbed_gpio_desc *)desc->extra)->gpio_pin;
-		gpio_output->write(value);
+	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;
 	}
 
-	if (value) {
-		// Unused variable - fix compiler warning
-	}
-
 	return FAILURE;
 }
 
@@ -212,10 +246,10 @@
  */
 int32_t gpio_get_value(struct gpio_desc *desc, uint8_t *value)
 {
-	DigitalIn *gpio_input;   	// pointer to gpio input object
+	DigitalIn *gpio_input;    	// pointer to gpio input object
 	uint8_t returnVal = FAILURE;
 
-	if (desc) {
+	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;
@@ -224,4 +258,4 @@
 	}
 
 	return FAILURE;
-}
+}
\ No newline at end of file