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16782: drivers/mfrc522: add new driver r=benpicco a=HendrikVE ### Contribution description This PR adds support for the MFRC522. It is quite common in the Arduino world and it is quite cheap. The driver connects to the MFRC522 via SPI and is heavily based on the Arduino driver available [here](https://github.com/miguelbalboa/rfid). Basically it was ported, but with several improvements in readability and documentation. ### Testing procedure The given (manual) test provides single commands for some driver functions. 19201: cpu/gd32v: add periph_i2c support r=benpicco a=gschorcht ### Contribution description This PR provides the `periph_i2c` support and is one of a bunch of PRs that complete the peripheral drivers for GD32VF103. The driver is a modified version of the driver for STM32F1 with some changes that were necessary to get it working on GD32V. As for STM32F1, the driver is using polling instead of interrupts for now. It will be implemented interrupt-driven later. ### Testing procedure `tests/periph_i2c` as well as a test with any I2C sensor should work. The driver was tested with `tests/driver_l3gxxxx` and `tests/driver_bmp180`. ### Issues/PRs references Co-authored-by: Hendrik van Essen <hendrik.ve@fu-berlin.de> Co-authored-by: Gunar Schorcht <gunar@schorcht.net> |
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