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authorSergey Vlasov <sigprof@gmail.com>2020-11-12 12:00:35 +0300
committerGitHub <noreply@github.com>2020-11-12 20:00:35 +1100
commit0dee334bcee1307130fb8d5d17c37f374afb4059 (patch)
tree3cb13f6992f1c4a7065604a4cc98214357a81ce2 /keyboards/handwired
parenta422309354a17137c402c43f581c4e57acd510cb (diff)
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.
Diffstat (limited to 'keyboards/handwired')
-rw-r--r--keyboards/handwired/onekey/blackpill_f401/blackpill_f401.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/keyboards/handwired/onekey/blackpill_f401/blackpill_f401.c b/keyboards/handwired/onekey/blackpill_f401/blackpill_f401.c
new file mode 100644
index 0000000000..956932329c
--- /dev/null
+++ b/keyboards/handwired/onekey/blackpill_f401/blackpill_f401.c
@@ -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);
+}