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intercom: Disable rx while doing tx. Avoids local RS485 half-duplex echo. 

Signed-off-by: Michael Moon <triffid.hunter@gmail.com>
This commit is contained in:
Markus Amsler 2011-02-14 11:30:05 +11:00 committed by Michael Moon
parent 959bae2f4a
commit e41e659e66
4 changed files with 18 additions and 4 deletions
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1
extruder/extruder.c
View File

@ -28,6 +28,7 @@ void io_init(void) {
//Enable the RS485 transceiver
SET_OUTPUT(RX_ENABLE_PIN);
SET_OUTPUT(TX_ENABLE_PIN);
WRITE(RX_ENABLE_PIN,0);
disable_transmit();
#ifdef HEATER_PIN

10
extruder/intercom.h
View File

@ -2,9 +2,15 @@
#define _INTERCOM_H
#include <stdint.h>
#include "config.h"
#define enable_transmit() do { WRITE(TX_ENABLE_PIN,1); WRITE(RX_ENABLE_PIN,0); } while(0)
#define disable_transmit() do { WRITE(TX_ENABLE_PIN,0); WRITE(RX_ENABLE_PIN,0); } while(0)
#ifdef HOST
#define enable_transmit() do { WRITE(TX_ENABLE_PIN,1); UCSR1B &= ~MASK(RXEN1); } while(0)
#define disable_transmit() do { WRITE(TX_ENABLE_PIN,0); UCSR1B |= MASK(RXEN1); } while(0)
#else
#define enable_transmit() do { WRITE(TX_ENABLE_PIN,1); UCSR0B &= ~MASK(RXEN0); } while(0)
#define disable_transmit() do { WRITE(TX_ENABLE_PIN,0); UCSR0B |= MASK(RXEN0); } while(0)
#endif
// initialise serial subsystem
void intercom_init(void);

10
intercom.h
View File

@ -2,9 +2,15 @@
#define _INTERCOM_H
#include <stdint.h>
#include "config.h"
#define enable_transmit() do { WRITE(TX_ENABLE_PIN,1); WRITE(RX_ENABLE_PIN,0); } while(0)
#define disable_transmit() do { WRITE(TX_ENABLE_PIN,0); WRITE(RX_ENABLE_PIN,0); } while(0)
#ifdef HOST
#define enable_transmit() do { WRITE(TX_ENABLE_PIN,1); UCSR1B &= ~MASK(RXEN1); } while(0)
#define disable_transmit() do { WRITE(TX_ENABLE_PIN,0); UCSR1B |= MASK(RXEN1); } while(0)
#else
#define enable_transmit() do { WRITE(TX_ENABLE_PIN,1); UCSR0B &= ~MASK(RXEN0); } while(0)
#define disable_transmit() do { WRITE(TX_ENABLE_PIN,0); UCSR0B |= MASK(RXEN0); } while(0)
#endif
// initialise serial subsystem
void intercom_init(void);

1
mendel.c
View File

@ -126,6 +126,7 @@ void io_init(void) {
// Enable the RS485 transceiver
SET_OUTPUT(RX_ENABLE_PIN);
SET_OUTPUT(TX_ENABLE_PIN);
WRITE(RX_ENABLE_PIN,0);
disable_transmit();
#endif
}