handwired/onekey/blackpill_f401: Fix I2C pin config mismatch (#10322) By default the `i2c_master` driver for ChibiOS uses the B6 pin for `I2C1_SCL` and the B7 pin for `I2C1_SDA`. However, the ChibiOS board file used for the F401 Blackpill board (`ST_STM32F401C_DISCOVERY`) configures B6 as `I2C1_SCL` and B9 as `I2C1_SDA`, and if that configuration is left unchanged, enabling the `i2c_master` driver results in having two pins (B7 and B9) configured as `I2C1_SDA` at the same time, which does not work properly (experimental results show that the B9 pin still works as `I2C1_SDA` in that case, and the B7 pin does not work). Configure the B9 pin as an input with pull-up in `board_init()`, so that the B7 pin can be configured as `I2C1_SDA` by the I2C driver.
1 files changed, 23 insertions(+), 0 deletions(-) A keyboards/handwired/onekey/blackpill_f401/blackpill_f401.c
A keyboards/handwired/onekey/blackpill_f401/blackpill_f401.c => keyboards/handwired/onekey/blackpill_f401/blackpill_f401.c +23 -0
@@ 0,0 1,23 @@ /* Copyright 2020 Sergey Vlasov (sigprof) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include QMK_KEYBOARD_H void board_init(void) { // B9 is configured as I2C1_SDA in the board file; that function must be // disabled before using B7 as I2C1_SDA. setPinInputHigh(B9); }