diff options
| author | Mikkel Jeppesen <2756925+Duckle29@users.noreply.github.com> | 2019-08-31 02:47:11 +0200 |
|---|---|---|
| committer | Drashna Jaelre <drashna@live.com> | 2019-08-30 17:47:11 -0700 |
| commit | edc8283572d4f7648146b05d49dc446e169d4534 (patch) | |
| tree | e6b7385e1f662c7409df2524ba96c8e1e10416f6 | |
| parent | b7ddf64b547f48f7fd47937a5b33561f0090cd7c (diff) | |
Removed prescaler define from avr i2c, as it was impossible to use (#6617)
| -rw-r--r-- | docs/i2c_driver.md | 1 | ||||
| -rw-r--r-- | drivers/avr/i2c_master.c | 4 |
2 files changed, 2 insertions, 3 deletions
diff --git a/docs/i2c_driver.md b/docs/i2c_driver.md index 317307e1bf..856ca0a9b2 100644 --- a/docs/i2c_driver.md +++ b/docs/i2c_driver.md @@ -34,7 +34,6 @@ The following defines can be used to configure the I2C master driver. |Variable |Description |Default| |------------------|---------------------------------------------------|-------| |`F_SCL` |Clock frequency in Hz |400KHz | -|`Prescaler` |Divides master clock to aid in I2C clock selection |1 | AVRs usually have set GPIO which turn into I2C pins, therefore no further configuration is required. diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c index 52924437e0..c084d5754f 100644 --- a/drivers/avr/i2c_master.c +++ b/drivers/avr/i2c_master.c @@ -27,8 +27,8 @@ #ifndef F_SCL # define F_SCL 400000UL // SCL frequency #endif -#define Prescaler 1 -#define TWBR_val ((((F_CPU / F_SCL) / Prescaler) - 16) / 2) + +#define TWBR_val (((F_CPU / F_SCL) - 16) / 2) void i2c_init(void) { TWSR = 0; /* no prescaler */ |