Pins 1 and 10 on one side of the 4420P and pins 11 and 20 on the other side seem to be connected to their respective grounds. I couldn't work out where pins 6 and 15 of the 4420P go, nor pins 8 and 15 of MAX3241. *As far as I can tell, pin 9 (normally ring indicator - RI) is grounded. SA is the pin on the StrongArm upon which the signal is present Some of the lines perform other roles when the player is in DC mode (typically, when in a car).Ĥ DTR 23 55 debug LED?, MK2 SIR endec speed sel 1ħ RTS 24 54 MK2 SIR endec speed sel 2
#Navcoder bus simpleinterface2 serial#
The signal lines on the serial connector are driven from the GPIO lines of the StrongArm, via an RS-232 driver (a Maxim MAX3241 chip), a thick-film resistor array (a Bourns 4420P chip) and some other minor components. Many thanks to RobS for helping me figure out how this works, a few weeks ago. You could simply plug a D plug into the socket temporarily while testing.
#Navcoder bus simpleinterface2 software#
I'd strongly suggest working on getting the software working before doing anything to the hardware. However, you don't actually need to know this - you can just solder a wire to the back of the D socket. įrom there, the signal goes to the MAX3241 (RS-232 transceiver chip) pin 13 and comes out on pin 10, then on to the 4420P-601 resistor array pin 13 and out on pin 8 and finally out on pin 4 of the on-board serial (D socket) connector. The top highlighted StrongArm pin on the photo is pin 53 (pin 1 is above the blue dot and they are numbered anticlockwise so pin 52 is the left-most pin on the top row, followed by 53 as the top-most pin on the left, pin 104: bottom-most pin on the left, pin 105: left-most pin on the bottom, pin 156: right-most pin on the bottom, pin 157: bottom-most pin on the right, and and finally pin 208: top-most pin on the right-hand row). Sorry, had to push the compression really high and the resolution low to get it to upload to the BBS system. It may be that other lines (besides DTR) are also connected on this socket.Ĭan you give me additional references of the right GPIO to use and where to find it. I haven't had a chance to investigate further (other than to grep the entire source for any references to that GP). It is as if something else in the kernel is reverting the state. I say should, as I attempted to do just that in Hijack only to have the pin revert to its previous state shortly after. The DTR line (pin 4) on this socket is connected to GPIO23 on the StrongArm, so it should be possible to twiddle the GP and cause the pin to go high/low. If socket on the Empeg, things might be a little easier. Of course, there is also the TD and RD for the other serial port on the tuner connector. If you are a programming God and don't care to have a tuner, I guess it might just be possible to encourage the DSP to drive one of the tuner lines how you need - I don't know in which direction they are normally driven. If harness, you are going to find it mightily tricky. Which serial port plug will you be using? The one on the harness or the one on the back of the Empeg?
just a way to turn on/off any logic output. One of my greatest issues is to get a line output like RTS.
0 kommentar(er)
