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Made timeouts more explicit in write()

This commit is contained in:
maniacbug 2011-06-29 21:38:17 -07:00
parent ca4820cd27
commit c5823c2605
2 changed files with 23 additions and 16 deletions
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36
RF24.cpp
View File

@ -13,7 +13,7 @@
#undef SERIAL_DEBUG
#ifdef SERIAL_DEBUG
#define IF_SERIAL_DEBUG(x) (x)
#define IF_SERIAL_DEBUG(x) ({x;})
#else
#define IF_SERIAL_DEBUG(x)
#endif
@ -365,31 +365,34 @@ boolean RF24::write( const void* buf, uint8_t len )
// Allons!
ce(HIGH);
delayMicroseconds(15);
ce(LOW);
// ------------
// At this point we could return from a non-blocking write, and then call
// the rest after an interrupt
// Instead, we are going to block here until we get TX_DS (transmission completed and ack'd)
// or MAX_RT (maximum retries, transmission failed). Also, we'll timeout in case the radio
// is flaky and we get neither.
// IN the end, the send should be blocking. It comes back in 60ms worst case, or much faster
// if I tighted up the retry logic. (Default settings will be 750us.
// Monitor the send
uint8_t observe_tx;
uint8_t status;
uint8_t retries = 255;
uint32_t sent_at = millis();
const uint32_t timeout = 100; //ms to wait for timeout
do
{
status = read_register(OBSERVE_TX,&observe_tx,1);
IF_SERIAL_DEBUG(Serial.print(status,HEX));
IF_SERIAL_DEBUG(Serial.print(observe_tx,HEX));
if ( ! retries-- )
{
IF_SERIAL_DEBUG(printf("ABORTED: too many retries\n\r"));
break;
}
}
while( ! ( status & ( _BV(TX_DS) | _BV(MAX_RT) ) ) );
while( ! ( status & ( _BV(TX_DS) | _BV(MAX_RT) ) ) && ( millis() - sent_at < timeout ) );
// What was the result of the send?
if ( status & _BV(TX_DS) )
result = true;
IF_SERIAL_DEBUG(Serial.print(result?"...OK.":"...Failed"));
IF_SERIAL_DEBUG(Serial.print(result?"...OK.":"...Failed"); if ( status & _BV(MAX_RT) ) Serial.print(" too many retries"));
ack_payload_available = ( status & _BV(RX_DR) );
if ( ack_payload_available )
{
@ -400,7 +403,6 @@ boolean RF24::write( const void* buf, uint8_t len )
}
// Yay, we are done.
ce(LOW);
// Power down
write_register(CONFIG,read_register(CONFIG) & ~_BV(PWR_UP));
@ -440,7 +442,9 @@ boolean RF24::available(void)
boolean RF24::available(uint8_t* pipe_num)
{
uint8_t status = get_status();
IF_SERIAL_DEBUG(print_status(status));
// Too noisy, enable if you really want lots o data!! IF_SERIAL_DEBUG(print_status(status));
boolean result = ( status & _BV(RX_DR) );
if (result)

3
examples/pingpair/pingpair.pde
View File

@ -96,6 +96,9 @@ void setup(void)
// optionally, use a high channel to avoid WiFi chatter
radio.setChannel(110);
// optionally, increase the CRC length for improved reliability
radio.setCRCLength(RF24_CRC_16);
//
// Open pipes to other nodes for communication
//