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Diffstat (limited to 'docs/research.adoc')
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1 files changed, 40 insertions, 24 deletions
diff --git a/docs/research.adoc b/docs/research.adoc index 80e32f2..9da6303 100644 --- a/docs/research.adoc +++ b/docs/research.adoc @@ -415,43 +415,59 @@ for the puzzle bus, as we have found vital I^2^C limitations with the controller we had chosen. See the handover document for the found limitations. // TODO: REFERENCES +// TODO: Find synonym for 'vital' -==== PIC16F15276 +==== MCUs Supporting Master Addressable as Slave -The PIC16F15276 MCU shows possibilities to be addressable as a slave while -being in master mode. However, this can not be confirmed without physical -testing due to the datasheet not mentioning whether it can or can not support -this function. It is possible to use this MCU without the aforementioned -functionality by manually changing the RCEN register to manually set the -MCU to 'receiving' I^2^C instructions, however this also requires a degree of -testing. +===== Atmega328p + +The Atmega328p has multi-master support, where the MCU is addressable as a +slave while being in master mode. This has been confirmed using the Arduino +wire library on both the Arduino Mega and the Arduino Uno. + +===== PIC16F15276 & ESP32 + +Both the PIC16F15276 and the ESP32 MCUs show possibilities to be addressable as a slave while being in master mode. However, at the moment of writing this +has yet to be tested. // TODO: Add the following reference: // PIC16F15276 - 25.2.4.3 // https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ProductDocuments/DataSheets/PIC16F15256-74-75-76-Microcontroller-Data-Sheet-40002305.pdf -==== ESP32 - -The ESP32, like the PIC16F15276, shows possibilities to be addressable as a -slave while being in master mode, this also requires testing however. In the -case of the ESP32 it is possible to use the two I^2^C peripherals to achieve -roughly the same goal. This can be done by having one of the two peripherals -be initiated in master mode while the other peripheral is initiated in slave -mode. Allowing the MCU to send and recieve data to the I^2^C bus. This does -introduce increased code complexity but is a valid option if it goes through -testing. - // TODO: Add the following reference: // https://docs.espressif.com/projects/esp-idf/en/v4.3/esp32/api-reference/peripherals/i2c.html // https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf#i2c // https://www.bitsandparts.nl/documentation/482/ESP32_Specifications_EN_v1.pdf -==== RP2040 +==== Alternatives + +===== PIC16F15276 Registers + +In the case of the PIC16F15276 not support master addressable as slave the +following approach would most likely work. As the PIC16F15276 uses specific +registers for its master receive functions, namely the RCEN register, it can +be manually set to receive data from the I^2^C bus. However, this also has +yet to be tested. + +// TODO: Add the following reference: +// PIC16F15276 - 25.2.4.3 +// https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ProductDocuments/DataSheets/PIC16F15256-74-75-76-Microcontroller-Data-Sheet-40002305.pdf + +===== Multiple I^2^C Peripherals + +==== ESP32 & RP2040 + +The ESP32 and the RP2040 both have multiple peripherals for I^2^C +communication, while also supporting simultaneous configuration. This allows +both two I^2^C peripherals to be active, one being configured as a master and +the other being configured as a slave. This enables the controller to send and +receive data to the I^2^C bus without much difficulty. This does introduce +increased code complexity but is a valid option if it is succesful in testing. -As written in the handover document, the RP2040 does not support being -addressed as a slave while being in master mode. It does however, just like -the ESP32 have two I^2^C peripherals. Meaning the same theory can be applied -on this MCU. +// TODO: Add the following reference: +// https://docs.espressif.com/projects/esp-idf/en/v4.3/esp32/api-reference/peripherals/i2c.html +// https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf#i2c +// https://www.bitsandparts.nl/documentation/482/ESP32_Specifications_EN_v1.pdf === Puzzle Module Detection |