Diff: pwm.cpp

Revision:

17:af1f2416dd26

Child:

20:4951ea6abee5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pwm.cpp	Tue Jul 13 13:58:07 2021 +0530
@@ -0,0 +1,181 @@
+/***************************************************************************//**
+ *   @file   pwm.cpp
+ *   @brief  Implementation of PWM Mbed platform driver interfaces
+********************************************************************************
+ * Copyright (c) 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.
+*******************************************************************************/
+
+/******************************************************************************/
+/***************************** Include Files **********************************/
+/******************************************************************************/
+
+#include <stdio.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 "pwm.h"
+#include "gpio.h"
+#include "pwm_extra.h"
+
+/******************************************************************************/
+/********************** Macros and Constants Definitions **********************/
+/******************************************************************************/
+
+/******************************************************************************/
+/********************** Variables and User defined data types *****************/
+/******************************************************************************/
+
+/******************************************************************************/
+/************************ Functions Declarations ******************************/
+/******************************************************************************/
+
+/******************************************************************************/
+/************************ Functions Definitions *******************************/
+/******************************************************************************/
+
+/**
+ * @brief	Initialized the PWM interface
+ * @param	desc[in, out] - Pointer where the configured instance is stored
+ * @param	param[in] - Configuration information for the instance
+ * @return	SUCCESS in case of success, FAILURE otherwise.
+ */
+int32_t pwm_init(struct pwm_desc **desc,
+		 const struct pwm_init_param *param)
+{
+	struct pwm_desc *new_pwm_desc;
+	mbed::PwmOut *pwm;
+	struct mbed_pwm_desc *new_mbed_pwm_desc;
+
+	if (!desc || !param) {
+		return FAILURE;
+	}
+
+	/* Allocate memory for general PWM descriptor */
+	new_pwm_desc = (pwm_desc *)malloc(sizeof(pwm_desc));
+	if (!new_pwm_desc) {
+		goto err_new_pwm_desc;
+	}
+
+	new_pwm_desc->id = param->id;	// Pin number
+	new_pwm_desc->period_ns = param->period_ns;	// PWM period
+
+	/* Create and initialize Mbed PWM object */
+	pwm = new PwmOut((PinName)param->id);
+	if (!pwm) {
+		goto err_pwm;
+	}
+
+	/* Allocate memory for Mbed specific PWM descriptor for future use */
+	new_mbed_pwm_desc = (mbed_pwm_desc *)malloc(sizeof(mbed_pwm_desc));
+	if (!new_mbed_pwm_desc) {
+		goto err_new_mbed_pwm_desc;
+	}
+
+	new_mbed_pwm_desc->pwm_obj = (mbed::PwmOut *)pwm;
+	new_pwm_desc->extra = (mbed_pwm_desc *)new_mbed_pwm_desc;
+
+	/* Configure Mbed PWM parameters */
+	pwm->period_us(param->period_ns / 1000); 			// Period in usec
+	pwm->pulsewidth_us(param->duty_cycle_ns / 1000);	// Duty cycle in usec
+	pwm_disable(new_pwm_desc);
+
+	*desc = new_pwm_desc;
+
+	return SUCCESS;
+
+err_new_mbed_pwm_desc:
+	free(pwm);
+err_pwm:
+	free(new_pwm_desc);
+err_new_pwm_desc:
+	// Nothing to free
+
+	return FAILURE;
+}
+
+
+/**
+ * @brief	Enable the PWM interface
+ * @param	desc[in, out] - Pointer where the configured instance is stored
+ * @return	SUCCESS in case of success, FAILURE otherwise.
+ */
+int32_t pwm_enable(struct pwm_desc *desc)
+{
+	mbed::PwmOut *pwm;
+
+	if (desc) {
+		pwm = (mbed::PwmOut *)(((mbed_pwm_desc *)desc->extra)->pwm_obj);
+		if (!pwm) {
+			return FAILURE;
+		}
+
+		pwm->resume();
+
+		return SUCCESS;
+	}
+
+	return FAILURE;
+}
+
+
+/**
+ * @brief	Disable the PWM interface
+ * @param	desc[in, out] - Pointer where the configured instance is stored
+ * @return	SUCCESS in case of success, FAILURE otherwise.
+ */
+int32_t pwm_disable(struct pwm_desc *desc)
+{
+	mbed::PwmOut *pwm;
+
+	if (desc) {
+		pwm = (mbed::PwmOut *)(((mbed_pwm_desc *)desc->extra)->pwm_obj);
+
+		if (!pwm) {
+			return FAILURE;
+		}
+
+		pwm->suspend();
+
+		return SUCCESS;
+	}
+
+	return FAILURE;
+}
+
+
+/**
+ * @brief	Remove the memory allocated for PWM device descriptors
+ * @param	desc[in, out] - Pointer where the configured instance is stored
+ * @return	SUCCESS in case of success, FAILURE otherwise.
+ */
+int32_t pwm_remove(struct pwm_desc *desc)
+{
+	if (!desc) {
+		return FAILURE;
+	}
+
+	if (((mbed_pwm_desc *)desc->extra)->pwm_obj) {
+		delete((mbed::PwmOut *)((mbed_pwm_desc *)desc->extra)->pwm_obj);
+	}
+
+	free(desc);
+
+	return SUCCESS;
+}
+
+
+#ifdef __cplusplus  // Closing extern c
+}
+#endif //  _cplusplus