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Removed prescaler define from avr i2c, as it was impossible to use (#6617)

This commit is contained in:
Mikkel Jeppesen 2019-08-31 02:47:11 +02:00 committed by Drashna Jaelre
parent b7ddf64b54
commit edc8283572
2 changed files with 2 additions and 3 deletions
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1
docs/i2c_driver.md
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@ -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.

4
drivers/avr/i2c_master.c
View File

@ -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 */