diff options
| -rw-r--r-- | driver/tcpm/fusb302.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/driver/tcpm/fusb302.h b/driver/tcpm/fusb302.h index dc191bee5a..b0c8d061ad 100644 --- a/driver/tcpm/fusb302.h +++ b/driver/tcpm/fusb302.h @@ -50,7 +50,12 @@ #define TCPC_REG_MEASURE 0x04 #define TCPC_REG_MEASURE_VBUS (1<<6) -#define TCPC_REG_MEASURE_MDAC_MV(mv) (((mv)/42) & 0x3f) +/* + * MDAC reference voltage step size is 42 mV. Round our thresholds to reduce + * maximum error, which also matches suggested thresholds in datasheet + * (Table 3. Host Interrupt Summary). + */ +#define TCPC_REG_MEASURE_MDAC_MV(mv) (DIV_ROUND_NEAREST((mv), 42) & 0x3f) #define TCPC_REG_CONTROL0 0x06 #define TCPC_REG_CONTROL0_TX_FLUSH (1<<6) |