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Part VI — The Complete Reference Design, Operating Guide, Troubleshooting Manual, and Resources Updated for the finalized NANO UPDI PROGRAMMER Rev. 1.0.0 hardware We began this series with one deceptively simple question: What is UPDI? Six parts later, the answer is considerably richer than: “It is Microchip’s one-wire programming interface.” UPDI is indeed a one-wire
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Part VI — The Complete Reference Design, Operating Guide, Troubleshooting Manual, and Resources Updated for the finalized NANO UPDI PROGRAMMER Rev. 1.0.0 hardware We began this series with one deceptively simple question: What is UPDI? Six parts later, the answer is considerably richer than: “It is Microchip’s one-wire programming interface.” UPDI is indeed a one-wire
Continue Reading “All You Ever Needed To Know About UPDI, And Then Some!”
Part V — Using UPDI as an On-Chip Debugger Updated for the finalized NANO UPDI PROGRAMMER Rev. 1.0.0 hardware So far, we have used only half of UPDI’s name. We have built the: Unified Program and Debug Interface into a functioning programmer. Now we turn to the second half: Unified Program and Debug Interface This
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Part IV — High-Voltage UPDI Activation and Recovery By the end of Part III, our Arduino Nano could do something genuinely useful. It could: That is already a practical programmer. But there remains an awkward problem. What happens if the microcontroller’s UPDI pin is no longer configured as UPDI? Or, on newer devices, what happens
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Part III — Turning the Arduino Nano into a Real UPDI Programmer Updated for the finalized NANO UPDI PROGRAMMER Rev. 1.0.0 hardware Parts I and II got us across the wire. We now understand enough of UPDI to: That is already a useful communications system. But it is not yet a programmer. Programming begins when
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Part I — Foundations, Electrical Interface, Protocol, and High-Voltage Activation There was a time when connecting a programmer to an AVR microcontroller could consume a surprisingly large number of pins. Traditional AVR In-System Programming used SPI-like signaling. JTAG used four principal signaling wires plus reset and power references. debugWIRE reduced debugging to essentially one signal,
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Before reading the shell examples in this chapter, be explicit about the prompt transition: toyix> is the kernel monitor. ush> is the user shell. So when this chapter shows commands like: those commands must be typed inside the user shell after toyix> run shell. Chapter 39 made /programs/<name> usable as a launch target. That fixed
Continue Reading “Chapter 40 — Shell Job References with %1”
Before reading the shell examples in this chapter, be explicit about the prompt transition: toyix> is the kernel monitor. ush> is the user shell. So when this chapter shows commands like: those commands must be typed inside the user shell after toyix> run shell. Two other constraints still apply in this chapter: So cat README
Continue Reading “Chapter 39 — Path-Based Program Launching with /programs”
Before reading the shell examples in this chapter, be explicit about the prompt transition: toyix> is the kernel monitor. ush> is the user shell. So when this chapter shows commands like: those commands must be typed inside the user shell after toyix> run shell. In Chapter 37, Toyix gained its first real directory support at
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In Chapter 36, Toyix gained file metadata: The shell could now do: Now we are ready for the next filesystem milestone: This chapter adds: After this chapter: For compatibility with the previous chapters, /programs will remain a regular text file for now: The root directory / becomes the first actual directory. 1. What this chapter
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