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Switch TWI library to use 400kHz

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This commit is contained in:
Oleg Kostyuk 2013-09-09 01:33:29 +03:00
parent 39da065913
commit 777d1fba76
1 changed files with 3 additions and 3 deletions
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6
keyboard/ergodox/twimaster.c
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@ -14,11 +14,11 @@
/* define CPU frequency in Mhz here if not defined in Makefile */ /* define CPU frequency in Mhz here if not defined in Makefile */
#ifndef F_CPU #ifndef F_CPU
#define F_CPU 4000000UL #define F_CPU 16000000UL
#endif #endif
/* I2C clock in Hz */ /* I2C clock in Hz */
#define SCL_CLOCK 100000L #define SCL_CLOCK 400000L
/************************************************************************* /*************************************************************************
@ -26,7 +26,7 @@
*************************************************************************/ *************************************************************************/
void i2c_init(void) void i2c_init(void)
{ {
/* initialize TWI clock: 100 kHz clock, TWPS = 0 => prescaler = 1 */ /* initialize TWI clock: 400 kHz clock, TWPS = 0 => prescaler = 1 */
TWSR = 0; /* no prescaler */ TWSR = 0; /* no prescaler */
TWBR = ((F_CPU/SCL_CLOCK)-16)/2; /* must be > 10 for stable operation */ TWBR = ((F_CPU/SCL_CLOCK)-16)/2; /* must be > 10 for stable operation */