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rp2/machine_i2s: Add I2S protocol support.

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This commit adds I2S protocol support for the rp2 port:
- I2S API is consistent with STM32 and ESP32 ports
- I2S configurations supported:
  - master transmit and master receive
  - 16-bit and 32-bit sample sizes
  - mono and stereo formats
  - sampling frequency
  - 3 modes of operation:
    - blocking
    - non-blocking with callback
    - uasyncio
  - internal ring buffer size can be tuned
- DMA IRQs are managed on an I2S object basis, allowing other
  RP2 entities to use DMA IRQs when I2S is not being used
- MicroPython documentation
- tested on Raspberry Pi Pico development board
- build metric changes for this commit: text(+4552), data(0), bss(+8)

Signed-off-by: Mike Teachman <mike.teachman@gmail.com>
This commit is contained in:
Mike Teachman
2021-09-03 20:34:53 -07:00
committed by Damien George
parent 6d5296e65e
commit b6dbbbe82f
7 changed files with 1177 additions and 0 deletions
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2
ports/rp2/modmachine.h
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@@ -5,6 +5,7 @@
extern const mp_obj_type_t machine_adc_type;
extern const mp_obj_type_t machine_hw_i2c_type;
extern const mp_obj_type_t machine_i2s_type;
extern const mp_obj_type_t machine_pin_type;
extern const mp_obj_type_t machine_rtc_type;
extern const mp_obj_type_t machine_spi_type;
@@ -14,5 +15,6 @@ extern const mp_obj_type_t machine_wdt_type;
void machine_pin_init(void);
void machine_pin_deinit(void);
void machine_i2s_init0(void);
#endif // MICROPY_INCLUDED_RP2_MODMACHINE_H