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Project/Src/rt-thread/components/drivers/misc/rt_drv_pwm.c

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+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-05-07     aozima       the first version
+ */
+
+#include <string.h>
+
+#include <drivers/rt_drv_pwm.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;
+}
+
+#ifdef RT_USING_DEVICE_OPS
+static const struct rt_device_ops pwm_device_ops =
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    _pwm_read,
+    _pwm_write,
+    _pwm_control
+};
+#endif /* RT_USING_DEVICE_OPS */
+
+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));
+
+#ifdef RT_USING_DEVICE_OPS
+    device->parent.ops = &pwm_device_ops;
+#else
+    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;
+#endif /* RT_USING_DEVICE_OPS */
+
+    device->parent.type         = RT_Device_Class_Miscellaneous;
+    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(struct rt_device_pwm *device, int channel)
+{
+    rt_err_t result = RT_EOK;
+    struct rt_pwm_configuration configuration = {0};
+
+    if (!device)
+    {
+        return -RT_EIO;
+    }
+
+    configuration.channel = channel;
+    result = rt_device_control(&device->parent, PWM_CMD_ENABLE, &configuration);
+
+    return result;
+}
+
+rt_err_t rt_pwm_disable(struct rt_device_pwm *device, int channel)
+{
+    rt_err_t result = RT_EOK;
+    struct rt_pwm_configuration configuration = {0};
+
+    if (!device)
+    {
+        return -RT_EIO;
+    }
+
+    configuration.channel = channel;
+    result = rt_device_control(&device->parent, PWM_CMD_DISABLE, &configuration);
+
+    return result;
+}
+
+rt_err_t rt_pwm_set(struct rt_device_pwm *device, int channel, rt_uint32_t period, rt_uint32_t pulse)
+{
+    rt_err_t result = RT_EOK;
+    struct rt_pwm_configuration configuration = {0};
+
+    if (!device)
+    {
+        return -RT_EIO;
+    }
+
+    configuration.channel = channel;
+    configuration.period = period;
+    configuration.pulse = pulse;
+    result = rt_device_control(&device->parent, PWM_CMD_SET, &configuration);
+
+    return result;
+}
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+
+FINSH_FUNCTION_EXPORT_ALIAS(rt_pwm_enable, pwm_enable, enable pwm by channel.);
+FINSH_FUNCTION_EXPORT_ALIAS(rt_pwm_set, pwm_set, set pwm.);
+
+#ifdef FINSH_USING_MSH
+static int pwm_enable(int argc, char **argv)
+{
+    int result = 0;
+    struct rt_device_pwm *device = RT_NULL;
+
+    if (argc != 3)
+    {
+        rt_kprintf("Usage: pwm_enable pwm1 1\n");
+        result = -RT_ERROR;
+        goto _exit;
+    }
+
+    device = (struct rt_device_pwm *)rt_device_find(argv[1]);
+    if (!device)
+    {
+        result = -RT_EIO;
+        goto _exit;
+    }
+
+    result = rt_pwm_enable(device, atoi(argv[2]));
+
+_exit:
+    return result;
+}
+MSH_CMD_EXPORT(pwm_enable, pwm_enable pwm1 1);
+
+static int pwm_disable(int argc, char **argv)
+{
+    int result = 0;
+    struct rt_device_pwm *device = RT_NULL;
+
+    if (argc != 3)
+    {
+        rt_kprintf("Usage: pwm_enable pwm1 1\n");
+        result = -RT_ERROR;
+        goto _exit;
+    }
+
+    device = (struct rt_device_pwm *)rt_device_find(argv[1]);
+    if (!device)
+    {
+        result = -RT_EIO;
+        goto _exit;
+    }
+
+    result = rt_pwm_disable(device, atoi(argv[2]));
+
+_exit:
+    return result;
+}
+MSH_CMD_EXPORT(pwm_disable, pwm_disable pwm1 1);
+
+static int pwm_set(int argc, char **argv)
+{
+    int result = 0;
+    struct rt_device_pwm *device = RT_NULL;
+
+    if (argc != 5)
+    {
+        rt_kprintf("Usage: pwm_set pwm1 1 100 50\n");
+        result = -RT_ERROR;
+        goto _exit;
+    }
+
+    device = (struct rt_device_pwm *)rt_device_find(argv[1]);
+    if (!device)
+    {
+        result = -RT_EIO;
+        goto _exit;
+    }
+
+    result = rt_pwm_set(device, atoi(argv[2]), atoi(argv[3]), atoi(argv[4]));
+
+_exit:
+    return result;
+}
+MSH_CMD_EXPORT(pwm_set, pwm_set 1 100 50);
+
+#endif /* FINSH_USING_MSH */
+#endif /* RT_USING_FINSH */