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I2s input API and examples (#4539)

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Enables I2S stereo input via DMA using new API calls:

. i2s_rxtx_begin(bool rx, rool tx);
. i2s_read_sample(uint32_t *l, uint32_t *r);

Original API calls will only enable TX, so this is backwards compatible.

Add simple I2S input example code using Arduino serial plotter.

Add UDP transmit of I2S microphone data to a PC (remote microphone).

Clean up and reorganize code to share RX and TX logic as much as
possible.  Fix a potential WDT error while in blocking sample read
and write.
This commit is contained in:
Earle F. Philhower, III
2018-04-02 07:37:21 -07:00
committed by GitHub
parent 7ae8f98e57
commit 8ae553d99e
4 changed files with 479 additions and 141 deletions
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8
cores/esp8266/i2s.h
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@ -40,7 +40,8 @@ speed.
extern "C" {
#endif
void i2s_begin();
void i2s_begin(); // Enable TX only, for compatibility
bool i2s_rxtx_begin(bool enableRx, bool enableTx); // Allow TX and/or RX, returns false on OOM error
void i2s_end();
void i2s_set_rate(uint32_t rate);//Sample Rate in Hz (ex 44100, 48000)
void i2s_set_dividers(uint8_t div1, uint8_t div2);//Direct control over output rate
@ -48,10 +49,15 @@ float i2s_get_real_rate();//The actual Sample Rate on output
bool i2s_write_sample(uint32_t sample);//32bit sample with channels being upper and lower 16 bits (blocking when DMA is full)
bool i2s_write_sample_nb(uint32_t sample);//same as above but does not block when DMA is full and returns false instead
bool i2s_write_lr(int16_t left, int16_t right);//combines both channels and calls i2s_write_sample with the result
bool i2s_read_sample(int16_t *left, int16_t *right, bool blocking); // RX data returned in both 16-bit outputs.
bool i2s_is_full();//returns true if DMA is full and can not take more bytes (overflow)
bool i2s_is_empty();//returns true if DMA is empty (underflow)
bool i2s_rx_is_full();
bool i2s_rx_is_empty();
int16_t i2s_available();// returns the number of samples than can be written before blocking
int16_t i2s_rx_available();// returns the number of samples than can be written before blocking
void i2s_set_callback(void (*callback) (void));
void i2s_rx_set_callback(void (*callback) (void));
#ifdef __cplusplus
}