spi_master for AVR (#8299)
* 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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* [ISP Flashing Guide](de/isp_flashing_guide.md)
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* [ARM Debugging Guide](de/arm_debugging.md)
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* [I2C Driver](de/i2c_driver.md)
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* [SPI Driver](de/spi_driver.md)
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* [GPIO Controls](de/internals_gpio_control.md)
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* [Proton C Conversion](de/proton_c_conversion.md)
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