Audio output to PWM pins for STM32. We use one timer to generate the sample rate and one timer for the PWM signal.
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#include <PWMAudioSTM32.h>
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PWMConfig & | audioInfo () |
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virtual int | availableForWrite () |
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bool | begin (PWMConfig cfg) |
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virtual PWMConfig | defaultConfig () |
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virtual void | end () override |
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uint32_t | framesPerSecond () |
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bool | isTimerStarted () |
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| void | setBuffer (BaseBuffer< uint8_t > *buffer) |
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void | setPWMTimer (HardwareTimer &t) |
| | Defines the timer which is used to generate the PWM signal.
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uint32_t | underflowsPerSecond () |
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void | updateStatistics () |
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virtual size_t | write (const uint8_t *data, size_t len) |
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virtual int | decimation () |
| | Decimation factor to reduce the sample rate.
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void | deleteBuffer () |
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virtual int | effectiveOutputSampleRate () |
| | Provides the effective sample rate.
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| virtual bool | isDecimateActive () |
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virtual int | maxChannels () |
| | One timer supports max 4 output pins.
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virtual int | maxOutputValue () |
| | provides the max value for the configured resulution
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virtual int | maxSampleRate () |
| | Provides the max working sample rate.
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virtual int | nextValue () |
| | determines the next scaled value
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void | playNextFrame () |
| | writes the next frame to the output pins
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| virtual void | pwmWrite (int channel, int value) |
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virtual void | setupPWM () |
| | Setup PWM Pins.
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virtual void | setupTimer () |
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| virtual void | startTimer () override |
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AudioInfo | actual_info |
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PWMConfig | audio_config |
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BaseBuffer< uint8_t > * | buffer = nullptr |
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Decimate | decimate |
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uint32_t | frame_count = 0 |
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uint32_t | frame_size = 0 |
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uint32_t | frames_per_second = 0 |
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bool | is_blocking_write = true |
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bool | is_timer_started = false |
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int64_t | max_value |
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HardwareTimer * | p_pwm_timer = nullptr |
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PWM | pwm |
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TimerAlarmRepeating | ticker |
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uint32_t | time_1_sec |
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uint32_t | underflow_count = 0 |
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uint32_t | underflow_per_second = 0 |
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Audio output to PWM pins for STM32. We use one timer to generate the sample rate and one timer for the PWM signal.
- Author
- Phil Schatzmann
- Copyright
- GPLv3
◆ isDecimateActive()
| virtual bool isDecimateActive |
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inlineprotectedvirtualinherited |
The requested sampling rate is too hight: we only process half of the samples so we can half the sampling rate
◆ pwmWrite()
| virtual void pwmWrite |
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int |
channel, |
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int |
value |
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inlineprotectedvirtual |
write a pwm value to the indicated channel. The max value depends on the resolution
Implements DriverPWMBase.
◆ setBuffer()
You can assign your own custom buffer impelementation: must be allocated on the heap and will be cleaned up by this class
◆ startTimer()
| virtual void startTimer |
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inlineoverrideprotectedvirtual |
when we get the first write -> we activate the timer to start with the output of data
Implements DriverPWMBase.
The documentation for this class was generated from the following file:
