[DeviceDrivers] add pwm driver framework.

components/drivers/Kconfig

@@ -66,6 +66,10 @@ config RT_USING_PIN
     bool "Using generic GPIO device drivers"
     default y
 
+config RT_USING_PWM
+    bool "Using PWM device drivers"
+    default n
+
 config RT_USING_MTD_NOR
     bool "Using MTD Nor Flash device drivers"
     default n

components/drivers/include/drivers/rt_drv_pwm.h

@@ -0,0 +1,54 @@
+/*
+ * File      : rt_drv_pwm.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-05-07     aozima       the first version
+ */
+
+#ifndef __DRV_PWM_H_INCLUDE__
+#define __DRV_PWM_H_INCLUDE__
+
+#define PWM_CMD_ENABLE      (128 + 0)
+#define PWM_CMD_DISABLE     (128 + 1)
+#define PWM_CMD_SET         (128 + 2)
+#define PWM_CMD_GET         (128 + 3)
+
+struct rt_pwm_configuration
+{
+    rt_uint32_t channel; /* 0-n */
+    rt_uint32_t period;  /* unit:ns 1ns~4.29s:1Ghz~0.23hz */
+    rt_uint32_t pulse;   /* unit:ns (pulse<=period) */
+};
+
+struct rt_device_pwm;
+struct rt_pwm_ops
+{
+    rt_err_t (*control)(struct rt_device_pwm *device, int cmd, void *arg);
+};
+
+struct rt_device_pwm
+{
+    struct rt_device parent;
+    const struct rt_pwm_ops *ops;
+};
+
+extern rt_err_t rt_device_pwm_register(struct rt_device_pwm *device, const char *name, const struct rt_pwm_ops *ops, const void *user_data);
+
+#endif /* __DRV_PWM_H_INCLUDE__ */

components/drivers/include/rtdevice.h

@@ -112,6 +112,10 @@ extern "C" {
 #include "drivers/cputime.h"
 #endif
 
+#ifdef RT_USING_PWM
+#include "drivers/rt_drv_pwm.h"
+#endif
+
 #ifdef __cplusplus
 }
 #endif

components/drivers/misc/SConscript

@@ -8,6 +8,9 @@ group = []
 if GetDepend(['RT_USING_PIN']):
     src = src + ['pin.c']
 
+if GetDepend(['RT_USING_PWM']):
+    src = src + ['_pwm.c']
+
 if len(src):
     group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
 

components/drivers/misc/_pwm.c

@@ -0,0 +1,163 @@
+/*
+ * File      : _pwm.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-05-07     aozima       the first version
+ */
+
+#include <string.h>
+
+#include <rtthread.h>
+#include <rtdevice.h>
+
+
+static rt_err_t _pwm_control(rt_device_t dev, int cmd, void *args)
+{
+    rt_err_t result = RT_EOK;
+    struct rt_device_pwm *pwm = (struct rt_device_pwm *)dev;
+
+    if (pwm->ops->control)
+    {
+        result = pwm->ops->control(pwm, cmd, args);
+	}
+
+	return result;
+}
+
+
+/*
+pos: channel
+void *buffer: rt_uint32_t pulse[size]
+size : number of pulse, only set to sizeof(rt_uint32_t).
+*/
+static rt_size_t _pwm_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
+{
+    rt_err_t result = RT_EOK;
+    struct rt_device_pwm *pwm = (struct rt_device_pwm *)dev;
+    rt_uint32_t *pulse = (rt_uint32_t *)buffer;
+    struct rt_pwm_configuration configuration={0};
+	
+	configuration.channel = pos;
+
+    if (pwm->ops->control)
+    {
+        result = pwm->ops->control(pwm, PWM_CMD_GET,  &configuration);
+        if (result != RT_EOK)
+        {
+            return 0;
+        }
+
+        *pulse = configuration.pulse;
+    }
+
+    return size;
+}
+
+/*
+pos: channel
+void *buffer: rt_uint32_t pulse[size]
+size : number of pulse, only set to sizeof(rt_uint32_t).
+*/
+static rt_size_t _pwm_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
+{
+    rt_err_t result = RT_EOK;
+    struct rt_device_pwm *pwm = (struct rt_device_pwm *)dev;
+    rt_uint32_t *pulse = (rt_uint32_t *)buffer;
+    struct rt_pwm_configuration configuration={0};
+
+	configuration.channel = pos;
+
+    if (pwm->ops->control)
+    {
+        result = pwm->ops->control(pwm, PWM_CMD_GET, &configuration);
+        if (result != RT_EOK)
+        {
+            return 0;
+        }
+
+        configuration.pulse = *pulse;
+
+        result = pwm->ops->control(pwm, PWM_CMD_SET, &configuration);
+        if (result != RT_EOK)
+        {
+            return 0;
+        }
+
+    }
+
+    return size;
+}
+
+rt_err_t rt_device_pwm_register(struct rt_device_pwm *device, const char *name, const struct rt_pwm_ops *ops, const void *user_data)
+{
+    rt_err_t result = RT_EOK;
+
+    memset(device, 0, sizeof(struct rt_device_pwm));
+
+    device->parent.type         = RT_Device_Class_Miscellaneous;
+
+    device->parent.init         = RT_NULL;
+    device->parent.open         = RT_NULL;
+    device->parent.close        = RT_NULL;
+    device->parent.read         = _pwm_read;
+    device->parent.write        = _pwm_write;
+    device->parent.control      = _pwm_control;
+
+    device->ops                 = ops;
+    device->parent.user_data    = (void *)user_data;
+
+    result = rt_device_register(&device->parent, name, RT_DEVICE_FLAG_RDWR);
+
+    return result;
+}
+
+rt_err_t rt_pwm_enable(int channel)
+{
+    rt_err_t result = RT_EOK;
+	struct rt_device *device = rt_device_find("pwm");
+    struct rt_pwm_configuration configuration={0};
+
+	if(!device)
+	{
+		return -RT_EIO;
+	}
+	
+	configuration.channel = channel;
+    result = rt_device_control(device, PWM_CMD_ENABLE, &configuration);
+
+    return result;	
+}
+
+rt_err_t rt_pwm_set(int channel, rt_uint32_t period, rt_uint32_t pulse)
+{
+    rt_err_t result = RT_EOK;
+	struct rt_device *pwm = rt_device_find("pwm");
+	
+	if(!pwm)
+	{
+		return -RT_EIO;
+	}
+
+    return result;	
+}
+
+
+#ifdef finsh
+#endif /**/