d-a-v/OneWireArduinoSlaveATTINY85
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improved high-level protocol

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This commit is contained in:
Youen Toupin 2015-08-08 22:36:24 +02:00
parent 4d94761fd5
commit cf5f36b503
1 changed files with 61 additions and 5 deletions
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66
OneWireIO.ino
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@ -15,6 +15,19 @@ Pin led(LEDPin);
byte owROM[7] = { 0xE2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 };
byte acknowledge = 0x42;
byte commandCheckError = 0xF1;
int turnOnTimeoutSeconds = 5 * 60;
const byte CMD_TurnOn = 0x01;
const byte CMD_TurnOff = 0x02;
const byte CMD_ReadState = 0x03;
const byte ANS_StateIsOn = 0x01;
const byte ANS_StateIsOff = 0x02;
volatile byte command = 0x0;
volatile long turnOnStartTime = 0;
void owReceive(OneWireSlave::ReceiveEvent evt, byte data);
@ -33,6 +46,13 @@ void loop()
{
delay(1);
long now = millis();
if (now > turnOnStartTime + (long)turnOnTimeoutSeconds * 1000 || now < turnOnStartTime)
{
led.writeLow();
turnOnStartTime = 0;
}
cli();//disable interrupts
#ifdef ENABLE_SERIAL_CHANNEL
SerialChannel::swap();
@ -49,11 +69,47 @@ void owReceive(OneWireSlave::ReceiveEvent evt, byte data)
switch (evt)
{
case OneWireSlave::RE_Byte:
if (data == 0x01)
led.writeHigh();
else if (data == 0x02)
led.writeLow();
OneWire.write(&acknowledge, 1, 0);
if (command == 0x00)
{
command = data;
}
else
{
if (data == (0xFF-command)) // to check there is no communication error, the master must send the command, and then its inverse
{
byte receivedCommand = command;
command = 0x0;
switch (receivedCommand)
{
case CMD_TurnOn:
turnOnStartTime = millis();
led.writeHigh();
OneWire.write(&acknowledge, 1, NULL);
break;
case CMD_TurnOff:
led.writeLow();
turnOnStartTime = 0;
OneWire.write(&acknowledge, 1, NULL);
break;
case CMD_ReadState:
bool state = led.read();
static byte response[2];
response[0] = state ? ANS_StateIsOn : ANS_StateIsOff;
response[1] = 0xFF - response[0];
OneWire.write(response, 2, NULL);
break;
}
}
else
{
command = 0x0;
OneWire.write(&commandCheckError, 1, NULL);
}
}
break;
case OneWireSlave::RE_Reset:
case OneWireSlave::RE_Error:
command = 0x0;
break;
default:
;