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nRF51822 space reserved for BT packet memory

david tay

Hi,

I understand that the available RAM on the nRD51822 is 16k. How much of that space is reserved for the transmission/ reception of BT packets?

Thanks,

David

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    Have you seen this? In general, the RAM consumption of a softdevice is given in the corresponding softdevice specification, so I'd recommend you to take a look at this document for the softdevice with the capabilities you're interested in.

    Edit: TX buffers are allocated as part of these 8 kB of RAM, and so is the complete GATT Table, so you don't consume anything of your application RAM for this by default. You can choose to have the values from the GATT Table in your user space RAM if wanted, but this is configurable on an attribute-to-attribute basis. The number of TX buffers available by default is 7, meaning that you can queue 7 packets for transmit, of which up to 6 will be sent per interval.

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    Have you seen this? In general, the RAM consumption of a softdevice is given in the corresponding softdevice specification, so I'd recommend you to take a look at this document for the softdevice with the capabilities you're interested in.

    Edit: TX buffers are allocated as part of these 8 kB of RAM, and so is the complete GATT Table, so you don't consume anything of your application RAM for this by default. You can choose to have the values from the GATT Table in your user space RAM if wanted, but this is configurable on an attribute-to-attribute basis. The number of TX buffers available by default is 7, meaning that you can queue 7 packets for transmit, of which up to 6 will be sent per interval.

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