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Change I2C clock speed to 444 kHz

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This commit is contained in:
Oleg Kostyuk 2013-09-09 02:54:24 +03:00
parent 5329bbefee
commit 260d7b7707
1 changed files with 9 additions and 3 deletions
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12
keyboard/ergodox/twimaster.c
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@ -26,10 +26,16 @@
*************************************************************************/ *************************************************************************/
void i2c_init(void) void i2c_init(void)
{ {
/* initialize TWI clock: 400 kHz clock, TWPS = 0 => prescaler = 1 */ /* initialize TWI clock
* minimal values in Bit Rate Register (TWBR) and minimal Prescaler
* bits in the TWI Status Register should give us maximal possible
* I2C bus speed - about 444 kHz
*
* for more details, see 20.5.2 in ATmega16/32 secification
*/
TWSR = 0; /* no prescaler */ TWSR = 0; /* no prescaler */
TWBR = ((F_CPU/SCL_CLOCK)-16)/2; /* must be > 10 for stable operation */ TWBR = 10; /* must be >= 10 for stable operation */
}/* i2c_init */ }/* i2c_init */