802.15.4 Power Management using Cyclic Sleep example for mbed XBeeLib By Digi
Description
This example characterizes a device that needs to be continuously joined to the coordinator so
it doesn't lose any incoming packets. A fast response to packets is not required so radio can
sleep for some time to save power while the coordinator buffers its packets.
The example configures the radio to poll its coordinator every 5 seconds if there is any packet for it.
If there is one or more, it awakes and send the packets to the mbed micro-controller.
Setup
Network
You need to set up a coordinator in the network so it buffers the packets send to our local XBee device while it's sleeping.
A module configured as coordinator requires:
- 'Coordinator Enable (CE)' parameter set to 1.
- 'Coordinator Association (A2)' parameter set to 0x04 so the coordinator allows end device association.
- 'Cyclic Sleep Period (SP)' parameter set as the local XBee device.
In the example it is set to 5000 which represent 5000 ms or 5 seconds.
In the coordinator, when using X-CTU for configuration, the SP parameter has to be entered as the desired sleep time divided by 10 and in hexadecimal so to cope with the example it should be 5000 / 10 = 500 = 0x1F4 -> 1F4
- 'Time Before Sleep (ST)' parameter set as the local XBee device; 500 ms = 0x1F4.
Demo run
While it is running, send a packet to the device:
- Go to the "Console" tab of the XCTU connected to the coordinator.
- Press the "Add API frame to the list" button.
- Press "Create using API Frame generator" button.
- Select "802.15.4" protocol and "0x00 - Tx (Transmit) Request 64-bit address" Frame Type.
- Paste the Local XBee device 64-bit address in the "64-bit dest. address" text box. (You can copy it from the application banner).
- In the "RF data" text box, select the ASCII box and type "Hello XBee!".
- Press OK, Add Frame.
- Select the frame and press the "Send selected frame" button to send the frame ("Hello XBee!") to the XBee network.
Once the XBee device receives the frame, the radio will wake up to send it to mbed micro-controller, which will process and print the received data.
Verify that the XBee module has received the frame by accessing the serial console terminal. If it was successful, the "Hello XBee!" message will be displayed there.
After that, the radio will go to sleep again until new data is received.
Diff: config.h
- Revision:
- 0:8b05ec51d9b9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/config.h Mon May 11 18:03:56 2015 +0200 @@ -0,0 +1,54 @@ + +#if !defined(__CONFIG_H_) +#define __CONFIG_H_ + +#define PATFORM_ARCHPRO + +/** Library configuration options */ +#define ENABLE_LOGGING +#define ENABLE_ASSERTIONS +#define FRAME_BUFFER_SIZE 10 +#define MAX_FRAME_PAYLOAD_LEN 128 +#define ENABLE_PM_SUPPORT + +#define SYNC_OPS_TIMEOUT_MS 2000 + +#if defined(PATFORM_ARCHPRO) +#define RADIO_TX P4_28 +#define RADIO_RX P4_29 +#define RADIO_RESET P2_13 +//#define RADIO_RESET NC +#define RADIO_SLEEP_REQ NC +#define RADIO_ON_SLEEP NC +#define DEBUG_TX P0_2 +#define DEBUG_RX P0_3 +#elif defined(TARGET_LPC1768) +#define RADIO_TX p9 +#define RADIO_RX p10 +#define RADIO_RESET p30 +#define RADIO_SLEEP_REQ NC +#define RADIO_ON_SLEEP NC +#define DEBUG_TX P0_2 +#define DEBUG_RX P0_3 +#elif defined(TARGET_FRDM_KL25) +#define RADIO_TX PTD3 +#define RADIO_RX PTD2 +#define RADIO_RESET NC +#define RADIO_SLEEP_REQ NC +#define RADIO_ON_SLEEP NC +#define DEBUG_TX USBTX +#define DEBUG_RX USBRX +#elif (defined TARGET_LPC11U24) +#define RADIO_TX p9 +#define RADIO_RX p10 +#define RADIO_RESET p30 +#define RADIO_SLEEP_REQ NC +#define RADIO_ON_SLEEP NC +#define DEBUG_TX USBTX +#define DEBUG_RX USBRX +#else +#error "Define a platform" +#endif + +#endif /* __CONFIG_H_ */ +