diff options
| -rw-r--r-- | chip/stm32/i2c-stm32f.c | 6 | ||||
| -rw-r--r-- | chip/stm32/i2c-stm32l.c | 6 |
2 files changed, 10 insertions, 2 deletions
diff --git a/chip/stm32/i2c-stm32f.c b/chip/stm32/i2c-stm32f.c index 6c7f58556c..851209557b 100644 --- a/chip/stm32/i2c-stm32f.c +++ b/chip/stm32/i2c-stm32f.c @@ -44,9 +44,13 @@ * mode). The slave is supposed to wait forever for the master to read bytes. * ...but we're going to keep the timeout to make sure we're robust. It may in * fact be needed if the host resets itself mid-read. + * + * NOTE: One case where this timeout is useful is when the battery + * flips out. The battery may flip out and hold lines low for up to + * 25ms. If we just wait it will eventually let them go. */ #define I2C_TX_TIMEOUT_SLAVE (100 * MSEC) -#define I2C_TX_TIMEOUT_MASTER (10 * MSEC) +#define I2C_TX_TIMEOUT_MASTER (30 * MSEC) /* * We delay 5us in bitbang mode. That gives us 5us low and 5us high or diff --git a/chip/stm32/i2c-stm32l.c b/chip/stm32/i2c-stm32l.c index 8c256d5cb4..b2f528aa4f 100644 --- a/chip/stm32/i2c-stm32l.c +++ b/chip/stm32/i2c-stm32l.c @@ -34,8 +34,12 @@ * mode). The slave is supposed to wait forever for the master to read bytes. * ...but we're going to keep the timeout to make sure we're robust. It may in * fact be needed if the host resets itself mid-read. + * + * NOTE: One case where this timeout is useful is when the battery + * flips out. The battery may flip out and hold lines low for up to + * 25ms. If we just wait it will eventually let them go. */ -#define I2C_TX_TIMEOUT_MASTER (10 * MSEC) +#define I2C_TX_TIMEOUT_MASTER (30 * MSEC) /* * Delay 5us in bitbang mode. That gives us roughly 5us low and 5us high or |