Ameba MicroPython: [RTL8722CSM] [RTL8722DM] SPI

API Documents

Constructors

SPI(unit_id [required], baudrate [optional], polarity [optional], phase [optional], databits [optional], firstbit [optional], miso [optional], mosi [optional], sck [optional], mode [optional])

Create a SPI object and configure it using other parameters. This allows you to then read/write data on the SPI bus.

• unit_id: The unit ID of the hardware SPI, assume default value if left blank

• baudrate: The speed of SPI

• polarity: one of factor determining SPI mode. (deprecated)

• phase: one of factor determining SPI mode. (deprecated)

• databits: number of data bits

• Firstbit: this determine whether first bit is MSB or LSB

• miso: miso pin. (deprecated)

• mosi: mosi pin. (deprecated)

• sck: clock pin. (deprecated)

• mode: either MASTER mode or SLAVE mode

Note: All optional parameters have default values as follows,

Parameter	Default
Baudrate	2000000 Hz
Polarity	Inactive_low
Phase	Toggle_middle
Databits	8
Firstbit	MSB
Miso	N.A.
Mosi	N.A.
Sck	N.A.
Mode	MASTER

There is currently 2 set of SPI, they are,

unit	MOSI	MISO	SCK	CS
0	PB_18	PB_19	PB_20	PB_21
1	PB_4	PB_5	PB_6	PB_7

Note: both unit support master mode, but only unit 0 supports slave mode.

Methods

SPI.read()

This method waits and read data received in SPI buffer, then return the data received. Works in both master and slave mode.

SPI.write( value [required])

This method writes an integer value to SPI bus. Works in both master and slave mode.

• value: an integer value to be sent on SPI bus

Ameba MicroPython: [RTL8722CSM] [RTL8722DM] SPI

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