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spi_master for AVR (#8299)

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* Change _delay_ms/us() to wait_ms/us()

* Switch to platform-agnostic GPIO macros

* Add AVR spi_master and migrate Adafruit BLE code

* Set verbose back to false

* Add clock divisor, bit order and SPI mode configuration for init

* Add start and stop functions

* Move configuration of mode, endianness and speed to `spi_start()`

* Some breaks here would be good

* Default Adafruit BLE clock divisor to 4 (2MHz on the Feather 32U4)

* Remove mode and divisor enums

* Add some docs

* No hr at EOF

* Add links in sidebar
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Ryan 2020-04-08 11:04:31 +10:00 • committed by GitHub
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@ -121,6 +121,7 @@
* [Drivers](hardware_drivers.md)
* [ADC Driver](adc_driver.md)
* [I2C Driver](i2c_driver.md)
* [SPI Driver](spi_driver.md)
* [WS2812 Driver](ws2812_driver.md)
* [EEPROM Driver](eeprom_driver.md)
* [GPIO Controls](internals_gpio_control.md)