Software Implementation of a Simple DAC - We quantize a digital int16_t sample my mapping the value to the range of 0b0 to info.output_bits number of 1, where the intensity is represented by the number of ones. This is very similar to PWM! More...
#include <AudioDAC.h>
Inheritance diagram for SimpleDAC:
Public Member Functions | |
| virtual void | addNotifyAudioChange (AudioInfoSupport &bi) |
| Adds target to be notified about audio changes. | |
| virtual AudioInfo | audioInfo () override |
| provides the actual input AudioInfo | |
| virtual AudioInfo | audioInfoOut () |
| provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream | |
| virtual int | availableForWrite () override |
| virtual bool | begin () |
| virtual bool | begin (AudioInfo info) |
| bool | begin (DACInfo cfg) override |
| starts the Delta Sigma DAC | |
| virtual void | clearNotifyAudioChange () |
| Deletes all change notify subscriptions. | |
| virtual DACInfo | defaultConfig () |
| virtual void | end () |
| Stops the output. | |
| virtual void | flush () |
| bool | isBlocking () |
| virtual bool | isDeletable () |
| If true we need to release the related memory in the destructor. | |
| bool | isNotifyActive () |
| Checks if the automatic AudioInfo update is active. | |
| virtual | operator bool () |
| virtual uint32_t | outputFrameCount () |
| To be used for testing, we just count the number of frames that were sent to output. | |
| uint32_t | outputRate () override |
| virtual bool | removeNotifyAudioChange (AudioInfoSupport &bi) |
| Removes a target in order not to be notified about audio changes. | |
| virtual void | setAudioInfo (AudioInfo newInfo) override |
| Defines the input AudioInfo. | |
| void | setBlocking (bool blocking) |
| void | setNotifyActive (bool flag) |
| Deactivate/Reactivate automatic AudioInfo updates: (default is active) | |
| virtual void | startTimer () |
| TimerAlarmRepeating & | timer () |
| virtual size_t | write (const uint8_t *data, size_t len) |
| Writes the audio data to the output buffer. | |
| virtual size_t | write (uint8_t c) |
| Writes a single byte (of audio data) to the output buffer. | |
| virtual void | writeSilence (size_t len) |
Protected Member Functions | |
| size_t | availableFramesToWrite () override |
| determines how many frames we can write to the buffer | |
| void | notifyAudioChange (AudioInfo info) |
| void | quantize (int16_t audioValue, int left_right_idx) override |
| updates the buffer with analog value (represented by number of 1) | |
| virtual void | reset () |
| Releases the memory. | |
| void | writePins () |
Protected Attributes | |
| int | _timeout = 10 |
| bool | active |
| uint8_t * | active_count =nullptr |
| int | bit_counter = 0 |
| RingBuffer< uint8_t > | buffer = RingBuffer<uint8_t>(DEFAULT_BUFFER_SIZE) |
| uint8_t | bytes_per_sample = 2 |
| AudioInfo | cfg |
| int32_t * | cummulated_error = nullptr |
| int | current_bit = -1 |
| int32_t * | current_values = nullptr |
| const int | fixedPosValue =0x007fff00 |
| DACInfo | info |
| bool | is_active = false |
| bool | is_blocking = true |
| bool | is_notify_active = true |
| int32_t * | last_values = nullptr |
| Vector< AudioInfoSupport * > | notify_vector |
| DACOut | out |
| TimerAlarmRepeating | timer_object |
| SingleBuffer< uint8_t > | tmp {MAX_SINGLE_CHARS} |
| int | tmpPos = 0 |
| uint8_t | write_buffer [4] |
| int | write_buffer_pos = 0 |
Friends | |
| void | dacTimerCallback (void *ptr) |
Detailed Description
Software Implementation of a Simple DAC - We quantize a digital int16_t sample my mapping the value to the range of 0b0 to info.output_bits number of 1, where the intensity is represented by the number of ones. This is very similar to PWM!
- Copyright
- GPLv3
Member Function Documentation
◆ writeSilence()
|
inlinevirtualinherited |
Writes n 0 values (= silence)
- Parameters
-
len
The documentation for this class was generated from the following file:
- src/AudioTools/Sandbox/AudioDAC.h
