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Implement dynamic payloads, with an example

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This commit is contained in:
maniacbug
2011-07-10 08:00:58 -07:00
parent 98fbd44111
commit 63eb62ebc3
3 changed files with 96 additions and 34 deletions
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54
examples/pingpair_dyn/pingpair_dyn.pde
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@@ -55,6 +55,17 @@ const char* role_friendly_name[] = { "invalid", "Ping out", "Pong back"};
// The role of the current running sketch
role_e role;
//
// Payload
//
const int min_payload_size = 4;
const int max_payload_size = 32;
const int payload_size_increments_by = 2;
int next_payload_size = min_payload_size;
char receive_payload[max_payload_size+1]; // +1 to allow room for a terminating NULL char
void setup(void)
{
//
@@ -87,6 +98,9 @@ void setup(void)
radio.begin();
// enable dynamic payloads
radio.enableDynamicPayloads();
// optionally, increase the delay between retries & # of retries
radio.setRetries(15,15);
@@ -137,22 +151,24 @@ void loop(void)
if (role == role_ping_out)
{
// The payload will always be the same, what will change is how much of it we send.
static char send_payload[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ789012";
// First, stop listening so we can talk.
radio.stopListening();
// Take the time, and send it. This will block until complete
unsigned long time = millis();
printf("Now sending %lu...",time);
radio.write( &time, sizeof(unsigned long) );
printf("Now sending length %i...",next_payload_size);
radio.write( send_payload, next_payload_size );
// Now, continue listening
radio.startListening();
// Wait here until we get a response, or timeout (250ms)
// Wait here until we get a response, or timeout
unsigned long started_waiting_at = millis();
bool timeout = false;
while ( ! radio.available() && ! timeout )
if (millis() - started_waiting_at > 250 )
if (millis() - started_waiting_at > 500 )
timeout = true;
// Describe the results
@@ -163,12 +179,20 @@ void loop(void)
else
{
// Grab the response, compare, and send to debugging spew
unsigned long got_time;
radio.read( &got_time, sizeof(unsigned long) );
uint8_t len = radio.getDynamicPayloadSize();
radio.read( receive_payload, len );
// Put a zero at the end for easy printing
receive_payload[len] = 0;
// Spew it
printf("Got response %lu, round-trip delay: %lu\n\r",got_time,millis()-got_time);
printf("Got response size=%i value=%s\n\r",len,receive_payload);
}
// Update size for next time.
next_payload_size += payload_size_increments_by;
if ( next_payload_size > max_payload_size )
next_payload_size = min_payload_size;
// Try again 1s later
delay(1000);
@@ -184,22 +208,26 @@ void loop(void)
if ( radio.available() )
{
// Dump the payloads until we've gotten everything
unsigned long got_time;
uint8_t len;
boolean done = false;
while (!done)
{
// Fetch the payload, and see if this was the last one.
done = radio.read( &got_time, sizeof(unsigned long) );
len = radio.getDynamicPayloadSize();
done = radio.read( receive_payload, len );
// Spew it
printf("Got payload %lu...",got_time);
// Put a zero at the end for easy printing
receive_payload[len] = 0;
// Spew it
printf("Got payload size=%i value=%s\n\r",len,receive_payload);
}
// First, stop listening so we can talk
radio.stopListening();
// Send the final one back.
radio.write( &got_time, sizeof(unsigned long) );
radio.write( receive_payload, len );
printf("Sent response.\n\r");
// Now, resume listening so we catch the next packets.