Search found 1743 matches

by Pito
Sat Feb 24, 2018 11:23 am
Forum: Projects
Topic: LSE RTC calibration
Replies: 15
Views: 261

Re: LSE RTC calibration

There is none heater in the DS, the DS is temperature compensated, it is not ovenized.. It measures the temperature, and based on a calibration table it changes the capacitors values. The DS chip itself is a pretty complex rig, maybe more complex than the 103C8 itself :) Here are the DS silicon shot...
by Pito
Fri Feb 23, 2018 10:09 pm
Forum: Projects
Topic: LSE RTC calibration
Replies: 15
Views: 261

Re: LSE RTC calibration

Timekeeping is a nice area for experiments, sure :) Except the DS measures the internal crystal temperature at specific intervals (you can set the period) and it adjusts the internal tuning capacitors accordingly, it has got the aging register where you may adjust the (changing) offset as well. It h...
by Pito
Fri Feb 23, 2018 9:53 pm
Forum: New users MUST post here first, and let us know a bit about you and your projects
Topic: chrissv: Playing with "Blue Pill"
Replies: 11
Views: 114

Re: chrissv: Playing with "Blue Pill"

Which board did you purchase?
You have to install the drivers for Maple DFU and Maple Serial.
by Pito
Fri Feb 23, 2018 9:27 pm
Forum: General discussion
Topic: STM32WB - dualcore with 2.4GHz radio
Replies: 3
Views: 54

STM32WB - dualcore with 2.4GHz radio

Dualcore - M4 (apps cpu) and M0+ (network cpu) - with 2.4GHz multi-protocol connectivity and w/ a lot of low-power features:

http://www.st.com/en/microcontrollers/s ... tId=SS1961
by Pito
Wed Feb 21, 2018 10:23 pm
Forum: Builds and Announcements
Topic: Optimisation and clock speed menu - enhancements
Replies: 23
Views: 1392

Re: Optimisation and clock speed menu - enhancements

@alexandros: Changing the clock on-the-fly: I think we discussed that in past - I wrote you have to take the specific routines from the core which 1. set the cpu clock (incl. flash wait states), 2. set millis/micros, 3. set serial baudrate, and create calls for example cpu72(), cpu128(), cpu8(), cpu...
by Pito
Tue Feb 20, 2018 5:49 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 775
Views: 15982

Re: F405 & F411 versions of the BluePill

Which means that the ferrite bead between GND and AGND is useless IMHO. I would suggest to make some practical measurements - with 0ohm and with FB. The topic is pretty tricky, so better do make measurements (various FB values) and compare on your first release pcb, rather than throwing FBs out in ...
by Pito
Tue Feb 20, 2018 3:40 pm
Forum: Projects
Topic: LSE RTC calibration
Replies: 15
Views: 261

Re: LSE RTC calibration

You cannot beat the DS3231, no chance. No crystal heater needed, no calibration, around one uA current in average, few secs/y off, not loosing time when BPill is flashed..
by Pito
Tue Feb 20, 2018 3:26 pm
Forum: General discussion
Topic: [all cores] F4+F1: ABP1 timer clock frequency
Replies: 3
Views: 112

Re: [all cores] F4+F1: ABP1 timer clock frequency

F4 - yes, there is a freq doubler when APB1,2 prescaler is not ==1 (see the CubeMX'es clock generator configuration tool).
I indicated 2y back the setPeriod() in F4 gives a wrong pwm period, it could be related to the setting as well..
F4 doubler.JPG
F4 doubler.JPG (23.4 KiB) Viewed 84 times
by Pito
Tue Feb 20, 2018 2:26 pm
Forum: Off topic
Topic: Any idea what this protocol is ????
Replies: 3
Views: 116

Re: Any idea what this protocol is ????

Which digital radio?
by Pito
Mon Feb 19, 2018 11:13 am
Forum: Off topic
Topic: Amiga on Out FPGA board
Replies: 3
Views: 106

Re: Amiga on Out FPGA board

Congratulation! Soldering such an FPGA requires a lot of courage! :)