It's completely 'beyond me', so if anyone can explain the protocol in a manner I can understand, I'd be very grateful. I've looked at all the loader variants written but something isn't gelling and I remain completely confused. I'm also having trouble relating PropellerLoader.spin ( which seems to just send a stream of 1T and 2T 'bits' ) to BootSequence.spin found elsewhere which seems to be byte oriented, with particular importance given to $F9 bytes.įrom the unframed bit sequences sent in PropellerLoader.spin it would seem possible to pack as many 1T and 2T bits into each serially framed back-to-back bytes as possible ( up to 5 x 1T's ), but BootSequence.spin states encoding is "up to 3 bits sent per serial byte". I think I can understand the transmission protocol but am entirely unclear on the hows and whys of "WaitBit" in Chip's PropellerLoader.spin, and especially how that would be implemented when using UART, byte receive only.
The serial bootloader offers a zero-cost solution to applications already equipped with a serial interface and SCI pins available on a connector.A more formal specification of the protocol would be very welcome, by myself and I am sure others. The developer’s serial bootloader is a complementary utility for either demo purposes or applications originally developed using MMDS and requiring minor modifications to be done in-circuit. Because of its ability to modify MCU memory in-circuit, the serial bootloader is a utility that may be useful in developing applications. This application note is for embedded-software developers interested in alternative reprogramming tools. New Kinetis families include support for K series and L series. The developer’s serial bootloader supported microcotrollers includes 8-bit families HC08, HCS08 and 32-bit families ColdFire, Kinetis.
In-circuit programming is not intended to replace any of debuging and developing tool but it serves only as simple option of embedded system reprograming via serial asynchronous port or USB. The developer's serial bootloader offers to user easiest possible way how to update existing firmware on most of Freescale microcontrollers in-circuit.
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