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Post ArY768EHWwcYKkafdg by [email protected] |
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More posts by [email protected] |
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Post #ArY6obt8WKQN6gLRuC by [email protected] |
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remember Stellaris MCUs with this amazing errata? i love it so much https://www… |
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Post #ArY6pWdVX6n76iTGxU by [email protected] |
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you should read the full 52 page document, it's very entertaining |
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Post #ArY6uQgB6lYi523hKK by [email protected] |
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@whitequark holy shit that's some incredible detail for an errata documen. … |
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Post #ArY6wGssUtSEHQsRwu by [email protected] |
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it goes on by the way |
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Post #ArY6y6hTKe4FH4Pwzw by [email protected] |
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@gsuberland you should read the full document first :3 |
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Post #ArY70fTT0uL7hg5Vk8 by [email protected] |
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@whitequark got it open now |
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Post #ArY768EHWwcYKkafdg by [email protected] |
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it goes on and on and on please read the full document |
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Post #ArY7BmW7AYqijPcr1k by [email protected] |
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it also has other errata, like "JTAG doesn't work" and "PWM … |
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Post #ArY7J1S42bOh4sBSYC by [email protected] |
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@whitequark it’s wild how this device found its way to market |
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Post #ArY7NW8BuwHHO221oG by [email protected] |
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@uint8_t still sold even |
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Post #ArY7UggF5tKg8DNUWm by [email protected] |
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their estimated attrition rate over 10 years is *one percent of all MCUs shippe… |
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Post #ArY7e3nmUvaCRqNDRQ by [email protected] |
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@whitequark reminded of a microchip ethernet MCU with the errata "ethernet… |
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Post #ArY7oUTy9hAg5l51t2 by [email protected] |
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while the device is reset it configures pullups/pulldowns in a way that causes … |
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Post #ArY7rLgrIheTgzTK3E by [email protected] |
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@artemist well in this device ethernet works very questionably too so yes |
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Post #ArY7uGrlh0vRbEy5gW by [email protected] |
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@whitequark Error Creating Code? |
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Post #ArY809y6FfrnwZjnjE by [email protected] |
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@whitequark how the fuck did they even find the root cause there and if they ca… |
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Post #ArY83S1hZJxeoozYfI by [email protected] |
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"don't execute these particular accesses to SRAM, including if they ar… |
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Post #ArY8AyVbCOlVaUZ0xk by [email protected] |
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"sometimes our core will execute random parts of your code during reset. k… |
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Post #ArY8DXIIq1bY3IZ8oS by [email protected] |
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no comment |
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Post #ArY8H0izs9hsCLhzlo by [email protected] |
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"ROM bootloader cannot program a blank device" |
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Post #ArY8WC6FrWR7oypMAK by [email protected] |
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"watchdog cannot be cleared and resets the core even if not programmed to … |
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Post #ArY8WaMjdtsb52irBY by [email protected] |
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@whitequark "tell us you don't actually know how to make working flash… |
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Post #ArY8uHRTeRWjL9Et1c by [email protected] |
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"don't close a switch too fast or you'll kill the entire supply pi… |
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Post #ArY8x7GZwPNweJUfTM by [email protected] |
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"we still don't know how to do JTAG" |
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Post #ArY92JeTJtpAVf9IQ4 by [email protected] |
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"if you toggle a GPIO too quickly you can overheat it" by the way, th… |
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Post #ArY9DHvg43dCLwQde4 by [email protected] |
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"we don't know how to initialize an FSM to the right state. also we do… |
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Post #ArY9OuOzMctArLgDIG by [email protected] |
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"don't write the internal EEPROM more than 7 times per word" |
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Post #ArY9RoEakfWcbECS4u by [email protected] |
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@whitequark the chip that was so bad that after TI bought them they buried the … |
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Post #ArY9RoPw4UbDAPVVlA by [email protected] |
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@whitequark Oh I think you're quoting LM3S parts? The one that got annulled… |
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Post #ArY9RoaZQx6dhOU0Ku by [email protected] |
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@thejpster I switched to TM4C later in the thread, which isn't any better (… |
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Post #ArY9TFtnNgMmgnA79s by [email protected] |
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@whitequark ok to be fair, its very common to have major stuff not quite work. … |
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Post #ArY9TG4Qk8sDDm8bjc by [email protected] |
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@timonsku they did 7 silicon revisions and half of the errata isn't fixed i… |
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Post #ArY9WRqnOxcCcpHVyK by [email protected] |
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@whitequark lol i was going to guess that, with the rest being so bad, the I2C … |
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Post #ArY9b8k7s2BeoPOnTc by [email protected] |
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@whitequark lmao |
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Post #ArY9dJcKPZAF7JmyZ6 by [email protected] |
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"ask the watchdog timer to check if there's an EEPROM write before it … |
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Post #ArY9jswxxQVMRBZhjs by [email protected] |
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"if you use some of the documented functionality of the device you may bre… |
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Post #ArY9lo0HJsrVfv2WvI by [email protected] |
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@whitequark certified TI moment. I swear their analog stuff is worth it tho |
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Post #ArY9mnTSlzS6K6ACNk by [email protected] |
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@whitequark "make it colder" as a workaround is glorious |
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Post #ArY9rSMMhgUeHm46wS by [email protected] |
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"clock verification circuit doesn't verify clock" |
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Post #ArY9vOopoIFMSjGIC0 by [email protected] |
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direct quote: "a perfect monotonic [LDO output] ramp is difficult to achie… |
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Post #ArY9yGGc3wdYo8cTZ2 by [email protected] |
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@aleksorsist this is Stellaris, not TI |
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Post #ArYA6hSkpi6fTFK3bE by [email protected] |
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@whitequark There should be a wiki that just does errata reviews of parts and g… |
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Post #ArYA8alEinPTGRry9Q by [email protected] |
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@whitequark wasn't around for anything pre-TI, I take it that they were a s… |
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Post #ArYAFdja46k8VrSJk0 by [email protected] |
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@whitequark Thanks, this has cured my imposter syndrome about CPU design |
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Post #ArYASZIhrNmSWl3BCK by [email protected] |
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@whitequark This CPU is a menace to society, isn't it? |
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Post #ArYASszEfU5baA5ucq by [email protected] |
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@whitequark So good they said it twice |
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Post #ArYAW6dWNJYYmjTOXw by [email protected] |
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but!but!!!i haven't shown you the best part yetit's buried on page 1451… |
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Post #ArYAZcjlTw5BDE4SXo by [email protected] |
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i once killed a TM4C129x devboard by merely connecting a ground probe of a logi… |
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Post #ArYAdp2tf1sEXr1PSi by [email protected] |
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@aleksorsist yeah, I'm not sure that TI even changed the masks? |
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Post #ArYAxcnmtNRaMbOgOu by [email protected] |
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@whitequark This whole MCU is a collection of all the "how not to do it&qu… |
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Post #ArYAzPq63gFGjuKauW by [email protected] |
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@whitequark we added ESD protection and now you can kill the chip with ESD *and… |
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Post #ArYB56gOC9E741VKHw by [email protected] |
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@whitequark I killed a 6805 eval board by connecting the 5V input to the 12V su… |
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Post #ArYBGB99wDqi5uEzNA by [email protected] |
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@whitequark this is causing me to relive trauma |
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Post #ArYBs7JmcZrfDxIgTI by [email protected] |
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@gsuberland i wasn't even probing any signalit was just the fucking ground … |
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Post #ArYBxRmvwPGK9vTciu by [email protected] |
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@whitequark amazing |
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Post #ArYCu3NkKINFY9dozQ by [email protected] |
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@whitequark looks to me like the good old CMOS latchup from the parasitic PNPN … |
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Post #ArYEynMfVQHDEGWfUO by [email protected] |
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@whitequark Remind me again why I tend to like analog better than digital? The … |
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Post #ArYFRJo6TkjjxKxXiC by [email protected] |
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@whitequark Are you sure there's just 10 of them? |
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Post #ArYFlTpkuSmoqRLVpY by [email protected] |
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@pja I would go with "no" |
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Post #ArYFm8zPtRsMUHBJ56 by [email protected] |
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@Laberpferd I think so! |
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Post #ArYFqPJ3AcReFcOiKu by [email protected] |
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@whitequark "Rising: 1.9, Falling: 2.1"Did they implement hysteresis … |
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Post #ArYFqxdnVzF8joMlOa by [email protected] |
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@snowfox ...they... did I think? |
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Post #ArYFtu3HJblaTXggNc by [email protected] |
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@jernej__s Absolutely Not |
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Post #ArYHMYB3p5IUz8YFlI by [email protected] |
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@whitequark wait, this is incredible. These chips just dont work! |
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Post #ArYIFnL59bO9w2a7OK by [email protected] |
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@whitequark this alone is also a showstopper in my book! |
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Post #ArYJ1TaXtCA4a0YCtE by [email protected] |
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@whitequark ceci n'est pas une gpio |
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Post #ArYJcKD9iU9uDABIAa by [email protected] |
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@whitequark "There are only two hard things in Computer Science: cache inv… |
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Post #ArYM1H4cidbpd0DNVg by [email protected] |
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@whitequark I/O pad ESD protection design is not a job for the inexperienced. |
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Post #ArYOrEIIUvU3yTVps8 by [email protected] |
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@pja yep! |
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Post #ArYOxIPO76ZITLio7s by [email protected] |
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@whitequark I remember trying it out in the first rev eval kit and blowing the … |
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Post #ArYOxIa1TZ4j0KhIhc by [email protected] |
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@jmrubillon I have done the exact same thing and I didn't even connect the … |
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Post #ArYOza69JZYLunoRqy by [email protected] |
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see? reproducible! https://mastodon.ie/@jmrubillon/114077491584818472 |
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Post #ArYP7y7trVvckodBmC by [email protected] |
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@whitequark I guess the most amazing thing to me is these errata are for chips … |
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Post #ArYP7yIBFI9TGhROng by [email protected] |
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@danderson seven. seven rounds of partial or full mask respins |
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Post #ArYPecT9P7YJ8q8jtw by [email protected] |
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@whitequark “whoops, haha” the entire thread |
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Post #ArYQtQKcugENnOmAkK by [email protected] |
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@pja @whitequark no, they were acquired by Texas Instruments shortly after rele… |
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Post #ArYQtQVGH8joKNkfK4 by [email protected] |
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@ezaquarii @pja TI does however still sell them, not even NRND |
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Post #ArYQtZUAsYDSBcJQNU by [email protected] |
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@[email protected] It's always said that adding series resistor fo… |
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Post #ArYQtZgE9jrCmzx3AG by [email protected] |
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@niconiconi maybe like "get out of hell for fifty cents" card? |
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Post #ArYTHpou02WPhkhlr6 by [email protected] |
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@whitequark i worked with these stellaris parts for years, and either they fixe… |
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Post #ArYTHpy7RltWAL18Do by [email protected] |
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@whitequark some other fun "quirks" i remember off the top of my head… |
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Post #ArYTHq7KtVGccvKUaW by [email protected] |
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@sjolsen they actually mention the latter two in the errata now i think! |
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Post #ArYU0tPJVcCPrUDmsK by [email protected] |
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@rotopenguin not TI, Luminary Micro |
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Post #ArYV4nKe8eIO8FSksa by [email protected] |
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@whitequark I'm enjoying the insinuation that byte-aligned bytes are unalig… |
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Post #ArYV4nUDZ3x4bvwOnY by [email protected] |
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@wren6991 laughing out loud |
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Post #ArYWTyI2dMlhJMoUim by [email protected] |
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@whitequark "Oh, BTW, our ROM bootloader doesn't do this."I wonde… |
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Post #ArYXRf8mxXR7IPwrcu by [email protected] |
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@whitequark "tempest-class" indeed. What a chip, definitely putting i… |
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Post #ArYY3FK1OwroDz7jcW by [email protected] |
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@whitequark but, but, but TI says “Stellaris is the industry's leading fa… |
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Post #ArYYjD1uJWRLHIf0dM by [email protected] |
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@whitequark *reads*… h… holy fuck? How did that escape into production? I m… |
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Post #ArYYuoEsJN1vrjG1AW by [email protected] |
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@jpm beats me! TI paid an "undisclosed" amount of money for the start… |
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Post #ArYa7YArS1GFlD1FGy by [email protected] |
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@whitequark amazing |
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Post #ArYaDmxnNTl5Mksm8W by [email protected] |
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@whitequark I wonder if they've been emailing the rev0 masks to the fab on … |
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Post #ArYaDn5auTzrkwX0IC by [email protected] |
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@danderson there's a few mask changes where you can tell it because the ide… |
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Post #ArYaGwOokgEtV21bpQ by [email protected] |
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@jpm if you scroll down in the thread, TM4C129x (a newer series) somehow has ev… |
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Post #ArYbGGdU7x3NvW80XY by [email protected] |
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@whitequark I believe that is due to the capacitors between primary and seconda… |
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Post #ArYcCbtrE4JAfibej2 by [email protected] |
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@xlengineer1 wait, does that board have a flyback? |
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Post #ArYniosVbjDzgZXKro by [email protected] |
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@whitequark this entire document looks like a fever dream and this thread has m… |
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Post #ArYnip1N4mJW83gPgG by [email protected] |
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@8bit you're welcome lmao |
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Post #ArZVAYpd9oWw3WfHSS by [email protected] |
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@whitequark Meanwhile so many people in the industry: "do not use Chinese … |
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Post #ArZVFIkqMLOHdogboW by [email protected] |
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@whitequark TI stands for terrible instruments |
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Post #ArZWhbFvGWU75IHTSC by [email protected] |
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@whitequark Yes, but the power supply was off. I meant the USB's power supp… |
