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/*
* File : rt_drv_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 *device = rt_device_find("pwm");
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, 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;
if (argc != 2)
{
rt_kprintf("Usage: pwm_enable 1\n");
result = -RT_ERROR;
goto _exit;
}
result = rt_pwm_enable(atoi(argv[1]));
_exit:
return result;
}
MSH_CMD_EXPORT(pwm_enable, pwm_enable 1);
static int pwm_set(int argc, char **argv)
{
int result = 0;
if (argc != 4)
{
rt_kprintf("Usage: pwm_set 1 100 50\n");
result = -RT_ERROR;
goto _exit;
}
result = rt_pwm_set(atoi(argv[1]), atoi(argv[2]), atoi(argv[3]));
_exit:
return result;
}
MSH_CMD_EXPORT(pwm_set, pwm_set 1 100 50);
#endif /* FINSH_USING_MSH */
#endif /* RT_USING_FINSH */
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