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

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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-05-07 aozima the first version
* 2022-05-14 Stanley Lwin add pwm function
* 2022-07-25 liYony fix complementary outputs and add usage information in finsh
*/
#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 > 0) ? (pos) : (-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 > 0) ? (pos) : (-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;
rt_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_PWM;
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 > 0) ? (channel) : (-channel); /* Make it is positive num forever */
configuration.complementary = (channel > 0) ? (RT_FALSE) : (RT_TRUE); /* If nagetive, it's complementary */
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 > 0) ? (channel) : (-channel); /* Make it is positive num forever */
configuration.complementary = (channel > 0) ? (RT_FALSE) : (RT_TRUE); /* If nagetive, it's complementary */
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 > 0) ? (channel) : (-channel);
configuration.period = period;
configuration.pulse = pulse;
result = rt_device_control(&device->parent, PWM_CMD_SET, &configuration);
return result;
}
rt_err_t rt_pwm_set_period(struct rt_device_pwm *device, int channel, rt_uint32_t period)
{
rt_err_t result = RT_EOK;
struct rt_pwm_configuration configuration = {0};
if (!device)
{
return -RT_EIO;
}
configuration.channel = (channel > 0) ? (channel) : (-channel);
configuration.period = period;
result = rt_device_control(&device->parent, PWM_CMD_SET_PERIOD, &configuration);
return result;
}
rt_err_t rt_pwm_set_pulse(struct rt_device_pwm *device, int channel, rt_uint32_t pulse)
{
rt_err_t result = RT_EOK;
struct rt_pwm_configuration configuration = {0};
if (!device)
{
return -RT_EIO;
}
configuration.channel = (channel > 0) ? (channel) : (-channel);
configuration.pulse = pulse;
result = rt_device_control(&device->parent, PWM_CMD_SET_PULSE, &configuration);
return result;
}
rt_err_t rt_pwm_get(struct rt_device_pwm *device, struct rt_pwm_configuration *cfg)
{
rt_err_t result = RT_EOK;
if (!device)
{
return -RT_EIO;
}
result = rt_device_control(&device->parent, PWM_CMD_GET, cfg);
return result;
}
#ifdef RT_USING_FINSH
#include <stdlib.h>
#include <string.h>
#include <finsh.h>
static int pwm(int argc, char **argv)
{
rt_err_t result = -RT_ERROR;
char *result_str;
static struct rt_device_pwm *pwm_device = RT_NULL;
struct rt_pwm_configuration cfg = {0};
if(argc > 1)
{
if(!strcmp(argv[1], "probe"))
{
if(argc == 3)
{
pwm_device = (struct rt_device_pwm *)rt_device_find(argv[2]);
result_str = (pwm_device == RT_NULL) ? "failure" : "success";
rt_kprintf("probe %s %s\n", argv[2], result_str);
}
else
{
rt_kprintf("pwm probe <device name> - probe pwm by name\n");
}
}
else
{
if(pwm_device == RT_NULL)
{
rt_kprintf("Please using 'pwm probe <device name>' first.\n");
return -RT_ERROR;
}
if(!strcmp(argv[1], "enable"))
{
if(argc == 3)
{
result = rt_pwm_enable(pwm_device, atoi(argv[2]));
result_str = (result == RT_EOK) ? "success" : "failure";
rt_kprintf("%s channel %d is enabled %s \n", pwm_device->parent.parent.name, atoi(argv[2]), result_str);
}
else
{
rt_kprintf("pwm enable <channel> - enable pwm channel\n");
rt_kprintf(" e.g. MSH >pwm enable 1 - PWM_CH1 nomal\n");
rt_kprintf(" e.g. MSH >pwm enable -1 - PWM_CH1N complememtary\n");
}
}
else if(!strcmp(argv[1], "disable"))
{
if(argc == 3)
{
result = rt_pwm_disable(pwm_device, atoi(argv[2]));
}
else
{
rt_kprintf("pwm disable <channel> - disable pwm channel\n");
}
}
else if(!strcmp(argv[1], "get"))
{
cfg.channel = atoi(argv[2]);
result = rt_pwm_get(pwm_device, &cfg);
if(result == RT_EOK)
{
rt_kprintf("Info of device [%s] channel [%d]:\n",pwm_device, atoi(argv[2]));
rt_kprintf("period : %d\n", cfg.period);
rt_kprintf("pulse : %d\n", cfg.pulse);
rt_kprintf("Duty cycle : %d%%\n",(int)(((double)(cfg.pulse)/(cfg.period)) * 100));
}
else
{
rt_kprintf("Get info of device: [%s] error.\n", pwm_device);
}
}
else if (!strcmp(argv[1], "set"))
{
if(argc == 5)
{
result = rt_pwm_set(pwm_device, atoi(argv[2]), atoi(argv[3]), atoi(argv[4]));
rt_kprintf("pwm info set on %s at channel %d\n",pwm_device,atoi(argv[2]));
}
else
{
rt_kprintf("Set info of device: [%s] error\n", pwm_device);
rt_kprintf("Usage: pwm set <channel> <period> <pulse>\n");
}
}
else
{
rt_kprintf("pwm get <channel> - get pwm channel info\n");
}
}
}
else
{
rt_kprintf("Usage: \n");
rt_kprintf("pwm probe <device name> - probe pwm by name\n");
rt_kprintf("pwm enable <channel> - enable pwm channel\n");
rt_kprintf("pwm disable <channel> - disable pwm channel\n");
rt_kprintf("pwm get <channel> - get pwm channel info\n");
rt_kprintf("pwm set <channel> <period> <pulse> - set pwm channel info\n");
result = - RT_ERROR;
}
return RT_EOK;
}
MSH_CMD_EXPORT(pwm, pwm [option]);
#endif /* RT_USING_FINSH */
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