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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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commit 400ca2d035
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@ -104,6 +104,7 @@
* [ARM调试指南](zh-cn/arm_debugging.md)
* [ADC设备](zh-cn/adc_driver.md)
* [I2C设备](zh-cn/i2c_driver.md)
* [SPI设备](zh-cn/spi_driver.md)
* [WS2812设备](zh-cn/ws2812_driver.md)
* [EEPROM设备](zh-cn/eeprom_driver.md)
* [GPIO控制](zh-cn/internals_gpio_control.md)