ti,cc13xx-cc26xx-timer-pwm
Vendor: Texas Instruments
Note
An implementation of a driver matching this compatible is available in drivers/pwm/pwm_cc13xx_cc26xx_timer.c.
Description
TI SimpleLink CC13xx/CC26xx GPT timer PWM Controller Node
To configure a PWM node, you first need to define a board overlay with a
pinctrl configuration for the pin on which the PWM signal should be present:
&pinctrl {
gpt0_pwm: gpt0_pwm {
pinmux = <25 IOC_PORT_MCU_PORT_EVENT1>;
bias-disable;
drive-strength = <8>; /* in mA, can be 2, 4 or 8 */
};
};
Please be aware that the port event depends on the GPT instance chosen. The
following port events must be used for PWM:
- GPT0: IOC_PORT_MCU_PORT_EVENT1
- GPT1: IOC_PORT_MCU_PORT_EVENT3
- GPT2: IOC_PORT_MCU_PORT_EVENT5
- GPT3: IOC_PORT_MCU_PORT_EVENT7
Be careful not to choose a pin that is already in use on your board, this
might irreversible damage to your board as the given pin will be configured as
output and actively driven by the PWM driver.
Then enable the corresponding timer and PWM nodes and add a reference to the
pinctrl entry:
&gpt0 {
status = "okay";
};
&pwm0 {
status = "okay";
pinctrl-0 = <&gpt0_pwm>;
pinctrl-names = "default";
};
Now you can programmatically enable the PWM signal in your code:
static const struct device *pwm = DEVICE_DT_GET(DT_NODELABEL(pwm0));
int init_pwm(void)
{
uint32_t pwm_period_ns, pwm_pulse_ns;
uint32_t pwm_duty_percent = 50U;
uint32_t pwm_frequency = 1000U; /* 1kHz */
if (!device_is_ready(pwm)) {
LOG_ERR("Error: PWM device %s is not ready\n", pwm->name);
return -ENODEV;
}
pwm_period_ns = NSEC_PER_SEC / pwm_frequency;
pwm_pulse_ns = (pwm_duty_percent * pwm_period_ns) / 100;
return pwm_set(pwm, 0, pwm_period_ns, pwm_pulse_ns, 0);
}
Properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
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Pin configuration/s for the first state. Content is specific to the
selected pin controller driver implementation.
This property is required. |
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Number of items to expect in a pwm specifier
This property is required. |
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Pin configuration/s for the second state. See pinctrl-0.
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Pin configuration/s for the third state. See pinctrl-0.
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Pin configuration/s for the fourth state. See pinctrl-0.
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Pin configuration/s for the fifth state. See pinctrl-0.
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Names for the provided states. The number of names needs to match the
number of states.
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Deprecated properties not inherited from the base binding file.
(None)
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “ti,cc13xx-cc26xx-timer-pwm” compatible.
Name |
Type |
Details |
|---|---|---|
|
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indicates the operational status of a device
Legal values: See Important properties for more information. |
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compatible strings
This property is required. See Important properties for more information. |
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register space
See Important properties for more information. |
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name of each register space
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interrupts for device
See Important properties for more information. |
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extended interrupt specifier for device
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name of each interrupt
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phandle to interrupt controller node
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Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
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Clock gate information
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name of each clock
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number of address cells in reg property
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number of size cells in reg property
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DMA channels specifiers
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Provided names of DMA channel specifiers
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IO channels specifiers
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Provided names of IO channel specifiers
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mailbox / IPM channels specifiers
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Provided names of mailbox / IPM channel specifiers
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Power domain specifiers
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Provided names of power domain specifiers
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Number of cells in power-domains property
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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
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Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
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Automatically configure the device for runtime power management after the
init function runs.
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List of power states that will disable this device power.
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Specifier cell names
pwm cells: channel, period, flags