thanks - I was confuse - usually the /reset means entire system reset (restart to a boot up state) the big question now - if I have a switch on my board, does the customer has to solder a wire from RPI board to my board? and why doesnt RSPI just put the "run" on a pin header? :-) - maybe they run ou...
ok, I'm confuse - two reply - shorting the pin to gnd - make the Pi wake up, the other - short to gnd -reset ?
can we get some clarification on how to do a system reset ? I look at the schematic - no system reset ?
I notice the Run/global_en in RSPI 3B but not in RSPI 3B+ board - is it possible to send a RESET low from host computer to the RSPI RUN port?
assuming I convert my /RESET from 5V to 3.3V and solder my system /reset line to Raspberry RUN line ?
This is about mechanical size and stuff I'm looking for legs size (ie length and screw hole standard) for hat/pcb that lay on top of the Raspberry Pi 3/3+ with my board, I measured it to be 480 mils or 0.48" - The screw size seems to be 112 mils (?) the one next to the GPIO is so close to the gpio b...
How about publish a document on how to use GPIO with common device like a UART - a 16550 Uart - simple 8bit bus, with /CS, /REset, /ioread and /iowrite - alot of common interface chip has that common features I like seeing those GPIO connect to blinking lights, but why buy a 1.2Ghz SBC module to do ...
Since the Mcp23x17 VDD can be anywhere from 1.8v to 5.5V - what is the recommend voltage feeding the device?
How about other controller that can handle 3.3V, is there a recommendation on voltage - assuming I can put a 3.3V voltage
regulator on my hardware.
I have a small bus - 4 pins sharing over 4 RSPI node - length - about 24 inches long
I'm using GPIO and not I2C or UART or spi or ethernet - just 3.3V GPIO from each module.
Do I need termination of each end of the net ?
I was planning to use the I2C, but after re-look at the min speed of I2C, it is just too slow - I2C max clock is like 1.7Mhz? I need to talk to the MCP23017 - and need the gpio to detect a 2Mhz clock ( need to set certain pin to low on a clock low) and a 1.7mhz clock serial is just too slow for that...
instead of using RSP GPIO, I would recomend looking at Microchip MCP23017 (I2c) or MCP23S17 (SPI)
this gives you 16 GPIO per chip- if you use I2c, you can put it on the I2C Bus for a max of 8 device (x16 = 128 GPIO ports!!!)
enough for a blinking led show or some fancy I/O
is it possible to use a 74HCT138 to decode the current two SPI /cs line so one can get 4 /CS ? or the current gpio scheme
we can't do that ? or should I use another 3 GPIO to send to the 138 decoder so I can get access to 8 SPI device?
I'm thinking of connecting multiple RSP over WIFI - but not over the air using antennas. What I'm proposing is connecting these RSP wifi antennas socket to a board that has the wifi socket so 8 or 10 RSPI doesn't need to transmit over the air - but via a copper lan/hub - of course there will be a WI...
GPIO programming - I have a group of GPIO ports (say port 10,11,12,13,14,15,16,17) as an 8bit data port - I want to set an 8bit data to that 8bit data port? is there a function to set that value or do i have to convert to binary and set each bit to each gpio individually? - how about 16 data port wi...
so if I have multiple RPI module, how do I set a module to be a slave on I2c bus? I use a couple GPIO pins as a hard wire node number
how do I tell the OS that this is I2C slave and node number - I like to use the node number as an I2c address