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3 Commits

Author SHA1 Message Date
robert-hh
4d38ab652e samd: Make ADC, DAC, PWM, SPI objects consistent in how they print out. 
All of ADC, DAC, Pin, PWM and SPI looked different before this change.
 2022-10-25 23:36:01 +11:00
robert-hh
e5cf3fab95 samd/machine_pin: Change the pin handling and naming/numbering. 
Pin numbers are now the MCU port numbers in the range:

    PA0..PA31:  0..31
    PB0..PB31: 32..63
    PC0..PC31: 64..95
    PD0..PD31: 96..127

Pins can be denoted by the GPIO port number, the name as defined in
pins.csv or a string in the form Pxnn, like "PA16" or "PD03".

The pins.c and pins.h files are now obsolete.  The pin objects are part of
the AF table.

As result of a simplification, the code now supports using pin names or
numbers instead of pin objects for modules like UART, SPI, PWM, I2C, ADC,
pininfo.
 2022-10-25 23:34:07 +11:00
robert-hh
5c7e93ec48 samd/machine_adc: Add the machine.ADC class. 
With the method read_u16().  Keyword arguments of the constructor are:
- bits=n    The resolution; default is 12.
- average=n The average of samples, which are taken and cumulated.  The
            default value is 16.  Averaging by hw is faster than averaging
            in code.

The ADC runs at a clock freq 1.5 MHz.  A single 12 bit conversion takes
8 microseconds.
 2022-10-06 22:41:44 +11:00