[	Chip select (CS) active (low).
{	CS active (low), show the SPI read byte after every write.
] or }	CS disable (high).
r	Read one byte by sending dummy byte (0xff). (r:1…255 for bulk reads)
0b	Write this binary value. Format is 0b00000000 for a byte, but partial bytes are also fine: 0b1001.
0x	Write this HEX value. Format is 0×01. Partial bytes are fine: 0xA. A-F can be lower-case or capital letters.
0-255	Write this decimal value. Any number not preceded by 0x or 0b is interpreted as a decimal value.

> spi
> [0x40 0x0A 0x28]
CS ENABLED
WRITE: 0x40
WRITE: 0x0A
WRITE: 0x28
CS DISABLED
> [0x40 r]
CS ENABLED
WRITE: 0x40
READ: 0x00
CS DISABLED  
> {0x40 r:2}
CS ENABLED
WRITE: 0x40
READ: 0x00
READ: 0x01
READ: 0x02
CS DISABLED

{ or [	Issue I2C start condition.
] or }	Issue I2C stop condition.
r	Read one byte, send ACK. (r:1…255 for bulk reads)
s   I2C address scanner
0b	Write this binary value, check ACK. Format is 0b00000000 for a byte, but partial bytes are also fine: 0b1001.
0x	Write this HEX value, check ACK. Format is 0×01. Partial bytes are fine: 0xA. A-F can be lower-case or capital letters.
0-255	Write this decimal value, check ACK. Any number not preceded by 0x or 0b is interpreted as a decimal value.