The transmitter portion of the target shooting game Ranch Ranger. See RanchRangerRx for a complete description of the game.
Board_DIO1- Dipswitch #1. Inidicates a 1 point target.Board_DIO12- Dipswitch #2. Inidicates a 5 point target.Board_DIO15- Dipswitch #3. Inidicates a 10 point target.Board_DIO16_TDO- Dipswitch #4. Inidicates a 25 point target.Board_DIO17_TDI- Dipswitch #5. Inidicates a 100 point target.Board_DIO21- Dipswitch #6. Unused.Board_DIO7- Digital target input. 0 normally, 1 when target is hit.
- The default frequency is:
- 433.92 MHz for the CC1350-LAUNCHXL-433
- 433.92/490 MHz for the CC1352P-4-LAUNCHXL
- 2440 MHz on the CC2640R2-LAUNCHXL
- 868.0 MHz for other launchpads In order to change frequency, modify the smartrf_settings.c file.
RanchRangerTx begins in Standby mode. The Sensor Controller domain then waits for the target switch to trigger before waking up the System CPU. Once awake, the System CPU sends a single radio packet to be picked up by RanchRangerRx. We use the EasyLink API to access the RF driver, set the frequency and transmit packets.
A single task, "ranchRangerTxFn", configures the RF driver through the EasyLink API and transmits messages.
The EasyLink implements a basic header for transmitting and receiving data. This header supports addressing for a star or point-to-point network with acknowledgments.
Packet structure:
_________________________________________________________
| | | |
| 1B Length | 1-64b Dst Address | Payload |
|___________|___________________|_________________________|
Payload structure:
________________________________________________________
| | | |
| 2B Sequence # | 64b Unique ID | 1B Dipswitch State |
|_______________|___________________|____________________|
The sequence number is not currently used for anything, but may in the future. The 64 bit unique identifier is unique to the chip and is used by RanchRangerRx to prevent double counting of targets. The dipswitch state is 8 bits, although only the lowest 6 are currently set according the dipswitch on the board. The highest 2 bits should always be 0.