diff options
| -rw-r--r-- | components/net/freemodbus/port/portserial_m.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/components/net/freemodbus/port/portserial_m.c b/components/net/freemodbus/port/portserial_m.c index 366dc79983..f68794a617 100644 --- a/components/net/freemodbus/port/portserial_m.c +++ b/components/net/freemodbus/port/portserial_m.c @@ -57,7 +57,9 @@ BOOL xMBMasterPortSerialInit(UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, * set 485 mode receive and transmit control IO * @note MODBUS_MASTER_RT_CONTROL_PIN_INDEX need be defined by user */ +#if defined(RT_MODBUS_MASTER_USE_CONTROL_PIN) rt_pin_mode(MODBUS_MASTER_RT_CONTROL_PIN_INDEX, PIN_MODE_OUTPUT); +#endif /* set serial name */ if (ucPORT == 1) { @@ -128,12 +130,16 @@ void vMBMasterPortSerialEnable(BOOL xRxEnable, BOOL xTxEnable) /* enable RX interrupt */ serial->ops->control(serial, RT_DEVICE_CTRL_SET_INT, (void *)RT_DEVICE_FLAG_INT_RX); /* switch 485 to receive mode */ +#if defined(RT_MODBUS_MASTER_USE_CONTROL_PIN) rt_pin_write(MODBUS_MASTER_RT_CONTROL_PIN_INDEX, PIN_LOW); +#endif } else { /* switch 485 to transmit mode */ +#if defined(RT_MODBUS_MASTER_USE_CONTROL_PIN) rt_pin_write(MODBUS_MASTER_RT_CONTROL_PIN_INDEX, PIN_HIGH); +#endif /* disable RX interrupt */ serial->ops->control(serial, RT_DEVICE_CTRL_CLR_INT, (void *)RT_DEVICE_FLAG_INT_RX); } |