CC1150 PDF

If we refer to Table 28 though, we see that if we want to write to 0x3E in burst mode, we need to add 0x40 onto the address. Burst mode allows us to write multiple values in one go without incrementing the address. That looks like synchronous serial data to me with a clock on channel 3 and data on channel 1. Synchronous to the data in synchronous serial mode.

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If we refer to Table 28 though, we see that if we want to write to 0x3E in burst mode, we need to add 0x40 onto the address. Burst mode allows us to write multiple values in one go without incrementing the address. That looks like synchronous serial data to me with a clock on channel 3 and data on channel 1. Synchronous to the data in synchronous serial mode.

The sync word is a bit pattern that receivers can look out for, in a way people listen out for their name. Keeping it as default would likely cause problems in a busy environment these chips are becoming very common , so this might indicate they are not using the packet control built into the chip.

This is the maximum — packets. Another sign they might not be using packet control! This can be used to filter packets down. A neat feature of the CC11xx chips is being able to use a number of channels — offsets from the frequency.

This can be used for frequency hopping spread spectrum. Not used here though. This equates to ,,kHz. As the channel is set to 0x00, this will be the frequency used. This is calculated in a similar way to the frequency using an exponent and mantissa, and gives us 6. This means that the system is not using any of the inbuilt packet control. The microprocessor must deal with pre-amble, sync word and so on. If the system was using multiple channels, this decides how far apart they are.

Going to skip this for now. It looks like the CC is in a mode where it will accept synchronous serial data, generating a clock for the microprocessor to use. Pre-amble, sync, packet length and other features are implemented in the microprocessor. This is an interesting revelation — a huge advantage of the CC11xx chips is the automated packet control, and it has been thrown aside. Why would this be done? We can only speculate. Asynchronous serial mode is often used by devices when the CC is interfaced to legacy microprocessors — you can just send it raw data and it only does the RF side of things.

Synchronous serial is a bit different — the microprocessor needs to listen to a clock and clock data out. Maybe Friedland used to use another module that used a similar data exchange. Now we know how the CC is accepting data — so now we need to try and interpret that data. Next time!

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