8/26/2023 0 Comments Flat. io open hi hatThe automatic configuration is achieved using 2 dedicated pins (ID_SD and ID_SC) on the 40W B+ GPIO header that are reserved for an I2C EEPROM. In a nutshell a HAT is a rectangular board (65x56mm) that has four mounting holes in the (nicely rounded) corners that align with the mounting holes on the B+, has a 40W GPIO header and supports the special autoconfiguration system that allows automatic GPIO setup and driver setup. We are not breaking compatibility for existing boards we’re creating a specification that B+ add-on board designers can follow (if they so wish), which is designed to make end users’ lives much easier.ī+ sporting a (mechanical sample of a) HAT and showing camera and display connections The first 26 pins of the B+ GPIO header are identical to those of the original models, so most existing boards will still work. A significant feature of HATs is the inclusion of a system that allows the B+ to identify a connected HAT and automatically configure the GPIOs and drivers for the board, making life for the end user much easier!īefore we go any further, it is worth noting that there are obviously a lot of add-on boards designed for the original model A and B boards (which interface to the original 26 way GPIO header). A HAT is an add-on board for B+ that conforms to a specific set of rules that will make life easier for users. The Raspberry Pi B+ has been designed specifically with add-on boards in mind and today we are introducing ‘HATs’ (Hardware Attached on Top). Linux drivers blindly assuming GPIO pins are available can also occasionally cause confusion. Most of the time this all works OK, but it can be a bit challenging for new users. The Raspberry Pi has no knowledge of whether it has a board attached or not, and the various drivers, when loaded, will simply assume that they can make exclusive use of the GPIO interface. Users attaching an add-board to the model A or B Pi usually have to work out which drivers are required for their specific board, and then edit the relevant Linux files to make them load at boot time before the board is usable (or load them by hand from the command line). On the Raspberry Pi models A and B, the GPIO connector has 26 pins. Model B’s 26W vs Model B+’s 40W GPIO connectors
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