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* stm32f1: Add support for building with bootloader supportKevin O'Connor2018-10-111-0/+2
| | | | Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* stm32f1: add SPI supportGrigori Goronzy2018-07-071-0/+9
| | | | | | | | | Add basic SPI support and associated documentation. v2: remove baud rate check, fix baud rate calculations v3: finish transaction with BSY check, disable SPI when not in use Signed-off-by: Grigori Goronzy <greg@chown.ath.cx>
* Add STM32F103 portGrigori Goronzy2018-04-091-0/+136
Add a fully functional STM32F1 port, currently mostly targeting STM32F103 microcontrollers. This requires an 8 MHz XTAL. The maximum possible step rate is around 282K steps per second. This uses stm32flash to burn the firmware. The bootloader needs to be started by setting BOOT0 to 1 and resetting the MCU. There is no automatic bootloader, unlike on Arduino. Signed-off-by: Grigori Goronzy <greg@kinoho.net>
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