|
Martytoof posted:e: Oh man. Apparently it's all in the datasheet as well, only for some reason Atmel decided to call it straight up TWI instead of I2C. Oh, the follies of being inexperienced I2C is trademarked by phillips or something. I2C isn't a too bad to get working if you have any sort of hardware support, though be careful, I think the reference implementation on STM32s had some potential lock-ups. I did a work project a few years ago using i2c to talk to an eeprom and for the first couple of days we would get intermittant lock-ups until we fixed something. Zaxxon fucked around with this message at 19:47 on Jun 3, 2013 |
#
¿
Jun 3, 2013 19:45
|
|
|
|
| # ¿ May 20, 2024 17:58 |
|
|
Victor posted:Hey can you explain more about this? I came across some reddit comments to the same effect and couldn't trace their source. This is particularly important, as I fly a quad on an STM32F4! I haven't run into any lock-ups. as I said this was a few years back I was working on an embedded project using an STM32vet6 I think. ST provided a library of sorts to make things like SPI and I2C easy to implement in C. I remember the other dev first encountered sporadic lockups on his board, we traced it to some kind of interrupt issue in the I2C code, so at first we just put a whole chunk of it in a critical section. Later on, with a second board we found the exact spot, and crit sectioned that. This was on a board that was running a lot of interrupt based stuff (spi,i2c,usb,freeRTOS.) and other various junk. I'm sorry I'm not more detailed, this was an old job, at a company I don't work for anymore in a city I don't live in. Zaxxon fucked around with this message at 02:20 on Jun 4, 2013 |
|
#
¿
Jun 4, 2013 02:17
|
|
|
Martytoof posted:Hey Dragon users. Mine finally arrived and it is basically pretty awesome. Do you guys use the board itself to power your target or do you typically run external power to your target and just rely on the dragon to run ISP/debugWire? I read that the voltage regulators on the Dragon are fragile as a teenager's self esteem, and people are recommending using them via a powered USB hub instead of a direct connection to a computer's USB port. Is this a real thing I should be worried about? typically I just make the board I'm going to put the AVR on and get it's power supply working first. Then I just use the dragon for it's ISP or JTAG with an IDC cable. I've had mine for years, and never bothered putting it in a case or anything and it works fine like this.
|
|
#
¿
Jun 4, 2013 19:50
|
|
|
Victor posted:Out of curiosity, how careful of a person are you in general? For example, would you trust yourself with a shiny new iPhone such that you wouldn't put a screen protector on it even though you hate scratches? :-) If I thought the thing was super delicate I'd protect it. I've never had that kind of a problem with an AVR dragon. I might be the weird one, and I certainly don't think it's unreasonable to put the thing in a case, I've just never had to, but I'm also never programming chips powered by the dragon itself.
|
|
#
¿
Jun 5, 2013 19:35
|
|