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-rw-r--r--docs/config_options.md2
-rw-r--r--quantum/split_common/i2c.h4
2 files changed, 5 insertions, 1 deletions
diff --git a/docs/config_options.md b/docs/config_options.md
index d728a49c3e..afc29fae9c 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -91,6 +91,8 @@ This is a C header file that is one of the first things included, and will persi
* key combination that allows the use of magic commands (useful for debugging)
* `#define USB_MAX_POWER_CONSUMPTION`
* sets the maximum power (in mA) over USB for the device (default: 500)
+* `#define SCL_CLOCK 100000L`
+ * sets the SCL_CLOCK speed for split keyboards. The default is `100000L` but some boards can be set to `400000L`.
## Features That Can Be Disabled
diff --git a/quantum/split_common/i2c.h b/quantum/split_common/i2c.h
index b4c72bde0e..b3cbe8c826 100644
--- a/quantum/split_common/i2c.h
+++ b/quantum/split_common/i2c.h
@@ -25,7 +25,9 @@
#define SLAVE_BUFFER_SIZE 0x20
// i2c SCL clock frequency
-#define SCL_CLOCK 400000L
+#ifndef SCL_CLOCK
+#define SCL_CLOCK 100000L
+#endif
// Support 8bits right now (8 cols) will need to edit to take higher (code exists in delta split?)
extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];