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kimera: Change procedure when i2c timeout

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This commit is contained in:
Kai Ryu 2014-11-04 10:36:03 +09:00
parent b61da41afa
commit 34de691cde
1 changed files with 15 additions and 11 deletions
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26
keyboard/kimera/kimera.c
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@ -28,7 +28,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "kimera.h" #include "kimera.h"
#include "debug.h" #include "debug.h"
#define SCL_CLOCK 400000L #define SCL_CLOCK 400000L
#define SCL_DURATION (1000000L/SCL_CLOCK)/2
extern uint8_t i2c_force_stop; extern uint8_t i2c_force_stop;
uint8_t row_mapping[PX_COUNT] = { uint8_t row_mapping[PX_COUNT] = {
@ -296,18 +297,21 @@ ISR(WDT_vect)
{ {
dprintf("i2c timeout\n"); dprintf("i2c timeout\n");
/* let slave to release SDA */
TWCR = 0;
DDRD |= (1<<PD0);
DDRD &= ~(1<<PD1);
if (!(PIND & (1<<PD1))) {
for (uint8_t i = 0; i < 9; i++) {
PORTD &= ~(1<<PD0);
_delay_us(SCL_DURATION);
PORTD |= (1<<PD0);
_delay_us(SCL_DURATION);
}
}
/* send stop condition */ /* send stop condition */
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO); TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
TWCR = 0;
/* let slave to release SDA */
DDRD |= (1<<PD0);
for (uint8_t i = 0; i < 9; i++) {
PORTD &= ~(1<<PD0);
_delay_us((F_CPU / SCL_CLOCK - 16) / 2);
PORTD |= (1<<PD0);
_delay_us((F_CPU / SCL_CLOCK - 16) / 2);
}
/* escape from loop */ /* escape from loop */
i2c_force_stop = 1; i2c_force_stop = 1;