From: Brian G. <br...@in...> - 2005-10-22 05:06:06
|
How can I send serial on a GPIO? (The equivalent to the "serial" keyword on a basic stamp). Can I do this through the /proc/gpio filesystem? Is there a tutorial on reading/writing these somewhere? (sorry if the answer is RTM) Brian Gregory |
From: Dave H. <dhy...@gm...> - 2005-10-22 05:27:47
|
Hi Brian, > How can I send serial on a GPIO? (The equivalent to the "serial" keyword = on > a basic stamp). I hate to tell you this, but you're going to find this very hard to do. On a Basic Stamp, performing a serial keyword basically consumes 100% of the CPU. You could theoretically do this on a gumstix as well, but it would require writing a special kernel driver. You also wouldn't be able to use it for sending/receiving very much data. And everything else on the gumstix would grind to a halt whle this is happe= ning. You'd be much more likely to get something like this working on the robosti= x. What are you trying to do? -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@in...> - 2005-10-22 05:34:33
|
I'm trying to talk to a motor controller which accepts 1-byte serial commands. I didn't want to use a microcontroller because I need to really conserve weight. Brian Gregory Hi Brian, > How can I send serial on a GPIO? (The equivalent to the "serial" keyword on > a basic stamp). I hate to tell you this, but you're going to find this very hard to do. On a Basic Stamp, performing a serial keyword basically consumes 100% of the CPU. You could theoretically do this on a gumstix as well, but it would require writing a special kernel driver. You also wouldn't be able to use it for sending/receiving very much data. And everything else on the gumstix would grind to a halt whle this is happening. You'd be much more likely to get something like this working on the robostix. What are you trying to do? -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2005-10-22 06:20:45
|
Hi Brian, On 10/21/05, Brian Gregory <br...@in...> wrote: > I'm trying to talk to a motor controller which accepts 1-byte serial > commands. I didn't want to use a microcontroller because I need to really > conserve weight. There are a total of 4 serial ports on the gumstix (that are hardware serial ports). If you only have one device to access that you should be able to use the snd serial port available on the waysmall board. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@in...> - 2005-10-22 12:15:23
|
I need logic level serial on a single line (the baud is auto detected, but required to be less than 19200). Can I just wire one of the serial port TX lines from the breakout board to the motor controller input? Brian Gregory -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Dave Hylands Sent: Saturday, October 22, 2005 2:20 AM To: gum...@li... Subject: Re: [Gumstix-users] Newbie GPIO question Hi Brian, On 10/21/05, Brian Gregory <br...@in...> wrote: > I'm trying to talk to a motor controller which accepts 1-byte serial > commands. I didn't want to use a microcontroller because I need to really > conserve weight. There are a total of 4 serial ports on the gumstix (that are hardware serial ports). If you only have one device to access that you should be able to use the snd serial port available on the waysmall board. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2005-10-22 17:49:29
|
Hi Brian, On 10/22/05, Brian Gregory <br...@in...> wrote: > I need logic level serial on a single line (the baud is auto detected, bu= t > required to be less than 19200). Can I just wire one of the serial port T= X > lines from the breakout board to the motor controller input? That might work. The GPIO lines on the breakout board are 3.3v logic levels, so if your motor controller is compatable with that, then it should work fine. If not, you'll need some voltage conversion. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@in...> - 2005-10-22 19:13:18
|
The motor controller specs say 2.5-5.5V logic so I think I'll be fine. Thanks a lot for the help. I'll let you know how it goes. Brian Gregory -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Dave Hylands Sent: Saturday, October 22, 2005 1:49 PM To: gum...@li... Subject: Re: [Gumstix-users] Newbie GPIO question Hi Brian, On 10/22/05, Brian Gregory <br...@in...> wrote: > I need logic level serial on a single line (the baud is auto detected, but > required to be less than 19200). Can I just wire one of the serial port TX > lines from the breakout board to the motor controller input? That might work. The GPIO lines on the breakout board are 3.3v logic levels, so if your motor controller is compatable with that, then it should work fine. If not, you'll need some voltage conversion. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Brian G. <br...@in...> - 2005-10-22 23:00:32
|
OK, someone tell me how stupid I am. I have a gumstix 400mx connecting to my LAN via netCF, plus an attached breakout board. I've connected a wire from LDD1 (should be GPIO59) on the breakout board and I've issued the following after logging in: modprobe proc_gpio // to bring up /proc/gpio echo "GPIO out set" > GPIO59 // supposedly to send 'high' on LDD1 If I measure voltage to ground on that wire I would expect 3.3 logic voltage, which should disappear when I issue the following: echo "clear" > GPIO59 Why am I not seeing this? Am I way off base? (Have I fired something?) Brian Gregory -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Brian Gregory Sent: Saturday, October 22, 2005 3:13 PM To: gum...@li... Subject: RE: [Gumstix-users] Newbie GPIO question The motor controller specs say 2.5-5.5V logic so I think I'll be fine. Thanks a lot for the help. I'll let you know how it goes. Brian Gregory -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Dave Hylands Sent: Saturday, October 22, 2005 1:49 PM To: gum...@li... Subject: Re: [Gumstix-users] Newbie GPIO question Hi Brian, On 10/22/05, Brian Gregory <br...@in...> wrote: > I need logic level serial on a single line (the baud is auto detected, but > required to be less than 19200). Can I just wire one of the serial port TX > lines from the breakout board to the motor controller input? That might work. The GPIO lines on the breakout board are 3.3v logic levels, so if your motor controller is compatable with that, then it should work fine. If not, you'll need some voltage conversion. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2005-10-23 01:05:35
|
Hi Brian, On 10/22/05, Brian Gregory <br...@in...> wrote: > OK, someone tell me how stupid I am. You're not stupid :) > I have a gumstix 400mx connecting to my LAN via netCF, plus an attached > breakout board. I've connected a wire from LDD1 (should be GPIO59) on the > breakout board and I've issued the following after logging in: > > modprobe proc_gpio // to bring up /proc/gpio > echo "GPIO out set" > GPIO59 // supposedly to send 'high' on L= DD1 This would only work if your current directory was /proc/gpio. Otherwise you'll just create a file called GPIO59 in whatever directory you're in. Try using echo "GPIO out set" > /proc/gpio/GPIO59 and echo "GPIO out clear" > /proc/gpio/GPIO59 -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@g-...> - 2005-10-23 01:29:19
|
Brian Gregory Freelance Software Engineer gWebDesign LLC Voice: 410-274-7077 Fax: 443-628-0251 http://www.g-webdesign.com -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Dave Hylands Sent: Saturday, October 22, 2005 9:06 PM To: gum...@li... Subject: Re: [Gumstix-users] Newbie GPIO question Hi Brian, On 10/22/05, Brian Gregory <br...@in...> wrote: > OK, someone tell me how stupid I am. You're not stupid :) > I have a gumstix 400mx connecting to my LAN via netCF, plus an attached > breakout board. I've connected a wire from LDD1 (should be GPIO59) on the > breakout board and I've issued the following after logging in: > > modprobe proc_gpio // to bring up /proc/gpio > echo "GPIO out set" > GPIO59 // supposedly to send 'high' on LDD1 This would only work if your current directory was /proc/gpio. Otherwise you'll just create a file called GPIO59 in whatever directory you're in. Try using echo "GPIO out set" > /proc/gpio/GPIO59 and echo "GPIO out clear" > /proc/gpio/GPIO59 -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Brian G. <br...@in...> - 2005-10-23 01:31:49
|
Doh. I guess it was a path problem because I'm getting perfect 3.3 & 0 right now. Thanks a ton for the help. (Also, sorry for the double post) Brian Gregory |
From: Brian G. <br...@in...> - 2005-10-23 21:34:37
|
I wish I had an oscilloscope because I can seem to get any of the serial TX lines on the breakout board to send the right stuff. "The motor controller expects eight bits at a time (with no parity bit) at a constant baud rate ranging from 1200 to 19200 baud (it will be auto detected). The serial bits must be at logic levels and non-inverted." It is my understanding that the following are true: ttyS0 FFUART (as marked on the breakout) ttyS1 ??BT?? ttyS2 STUART ttyS3 HWUART I've tried all three that are available on the breakout with no results. I've set the baud rate with stty. I have a little c program that uses write() on /dev/ttyS? to send the 4 byte commands. I've looked at the GPIOs for the serial ports, do I need to set them to get them to work? Brian Gregory -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Brian Gregory Sent: Saturday, October 22, 2005 9:32 PM To: gum...@li... Subject: RE: [Gumstix-users] Newbie GPIO question Doh. I guess it was a path problem because I'm getting perfect 3.3 & 0 right now. Thanks a ton for the help. (Also, sorry for the double post) Brian Gregory ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2005-10-23 22:40:07
|
Hi Brian, On 10/23/05, Brian Gregory <br...@in...> wrote: > I wish I had an oscilloscope because I can seem to get any of the serial = TX > lines on the breakout board to send the right stuff. Take a look at the sertest.c program located here: <http://websvn.gumstix.com/listing.php?repname=3DBuildroot&path=3D%2Fbranch= es%2Fprojects%2Frobostix%2Fgumstix%2F&rev=3D0&sc=3D0> It does all of the right stuff to open a serial port, set up the baud rate etc. I've tested it with the robostix and it's known to work. I believe that HWUART might require a patch to work properly (this may have been fixed recently but you may not have the most recent kernel), but the STUART port (/dev/ttyS2) should work fine. You may need to execute these lines as well: echo "AF2 in" > /proc/gpio/GPIO46 echo "AF1 out" > /proc/gpio/GPIO47 in order to configure the right pins for STUART. I use the STUART port for communicating with the robostix. > It is my understanding that the following are true: > > ttyS0 FFUART (as marked on the breakout) > ttyS1 ??BT?? > ttyS2 STUART > ttyS3 HWUART Sounds right - The correct mapping is printed on the console during bootup. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@g-...> - 2005-10-28 03:42:00
|
This was actually a big help, although it still isn't working. I'm currently only wiring the TX line; do I need to do anything to the RX line? I have a level shifter, so the next thing to try is talking to my PC to prove the output it correct. Brian Gregory -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Dave Hylands Sent: Sunday, October 23, 2005 6:40 PM To: gum...@li... Subject: Re: [Gumstix-users] Newbie GPIO question Hi Brian, On 10/23/05, Brian Gregory <br...@in...> wrote: > I wish I had an oscilloscope because I can seem to get any of the serial TX > lines on the breakout board to send the right stuff. Take a look at the sertest.c program located here: <http://websvn.gumstix.com/listing.php?repname=Buildroot&path=%2Fbranches%2F projects%2Frobostix%2Fgumstix%2F&rev=0&sc=0> It does all of the right stuff to open a serial port, set up the baud rate etc. I've tested it with the robostix and it's known to work. I believe that HWUART might require a patch to work properly (this may have been fixed recently but you may not have the most recent kernel), but the STUART port (/dev/ttyS2) should work fine. You may need to execute these lines as well: echo "AF2 in" > /proc/gpio/GPIO46 echo "AF1 out" > /proc/gpio/GPIO47 in order to configure the right pins for STUART. I use the STUART port for communicating with the robostix. > It is my understanding that the following are true: > > ttyS0 FFUART (as marked on the breakout) > ttyS1 ??BT?? > ttyS2 STUART > ttyS3 HWUART Sounds right - The correct mapping is printed on the console during bootup. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Chris D. <cg...@co...> - 2005-10-28 15:45:24
|
On 10/27/05, Brian Gregory <br...@g-...> wrote: > This was actually a big help, although it still isn't working. > I'm currently only wiring the TX line; do I need to do anything to the RX > line? I don't believe not connecting RX will result in anything not working; however, you should be wiring the ground lines together. -chris |
From: Brian G. <br...@in...> - 2005-10-29 23:46:21
|
Yes, I'm wiring the grounds together, thanks. I used the old LED trick to test that the STUART is sending when I tell it to, and it appears to be sending, therefore I've verified my setup is correct. The only remaining question is whether or not I'm sending what the motor controller is expecting. Originally I've tested the motor controller circuit with a basic stamp microcontroller that I have and the bit pattern I'm sending is the same as I used with SEROUT on the basic stamp. So here are my questions: 1. I've used termio to set the baud rate but how do I ensure 8 bits, no parity, and 1 stop bit? 2. Is it possible that the STUART on the gumstix is inverted (or perhaps the basic stamp is)? 3. Is there anything else that could be different from the basic stamp SEROUT? Brian Gregory On 10/27/05, Brian Gregory <br...@g-...> wrote: > This was actually a big help, although it still isn't working. > I'm currently only wiring the TX line; do I need to do anything to the RX > line? I don't believe not connecting RX will result in anything not working; however, you should be wiring the ground lines together. -chris ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2005-10-30 01:58:20
|
HI Brian, > 1. I've used termio to set the baud rate but how do I ensure 8 bits, no > parity, and 1 stop bit? > 2. Is it possible that the STUART on the gumstix is inverted (or perhaps = the > basic stamp is)? > 3. Is there anything else that could be different from the basic stamp > SEROUT? The mini-din-8 connector is at RS-232 levels, which are inverted in relationship to logic levels (beside being different voltage ranges). If you were connecting directly from the Baisc Stamp to the motor controller, then you were probably using logic level signals. Do you have a link to the motor controller? -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@in...> - 2005-10-30 04:00:45
|
I'm using the logic level output from the breakout-gs board. The motor controller is here: http://www.pololu.com/products/pololu/0410/ Brian Gregory -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Dave Hylands Sent: Saturday, October 29, 2005 9:57 PM To: gum...@li... Subject: Re: [Gumstix-users] Newbie GPIO question HI Brian, > 1. I've used termio to set the baud rate but how do I ensure 8 bits, no > parity, and 1 stop bit? > 2. Is it possible that the STUART on the gumstix is inverted (or perhaps the > basic stamp is)? > 3. Is there anything else that could be different from the basic stamp > SEROUT? The mini-din-8 connector is at RS-232 levels, which are inverted in relationship to logic levels (beside being different voltage ranges). If you were connecting directly from the Baisc Stamp to the motor controller, then you were probably using logic level signals. Do you have a link to the motor controller? -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2005-10-30 04:55:32
|
Hi Brian, On 10/29/05, Brian Gregory <br...@in...> wrote: > I'm using the logic level output from the breakout-gs board. > The motor controller is here: http://www.pololu.com/products/pololu/0410/ Hmm. That should work fine. There was a labelling error on the breakout GS (rev 277) with the i2c and STUART ports. The port names are correct, but the pins are swapped. Just to review: 1 - Have you configured the GPIO lines? echo "AF2 in" > /proc/gpio/GPIO46 echo "AF1 out" > /proc/gpio/GPIO47 2 - Have you tried the sertest.c program? http://websvn.gumstix.com/listing.php?repname=3DBuildroot&path=3D%2Fbranche= s%2Fprojects%2Frobostix%2Fgumstix%2F&rev=3D0&sc=3D0 You should be able to compile it using the provided Makefile. Create a directory called robostix in the directory that contains gumstix-buildroot, and create a subdirectoy called gumstix in side the robostix directory. Put the Makefile and sertest.c inside the gumstix directory and do a make sertest (from within the robostix/gumstix directory) to build it. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@in...> - 2005-10-30 12:26:07
|
Yes, I have a setup script that sets up the GPIOs and I've taken the sertest.c code and stripped it down to the bare minimum so that it'll just send my serial commands by parameter. When I run the program, I can see an LED flash briefly when attached to the TX line. I've put in a support request to the motor controller mfg. also. Brian Gregory |
From: Dave H. <dhy...@gm...> - 2005-10-30 16:41:35
|
Hi Brian, On 10/30/05, Brian Gregory <br...@in...> wrote: > Yes, I have a setup script that sets up the GPIOs and I've taken the > sertest.c code and stripped it down to the bare minimum so that it'll jus= t > send my serial commands by parameter. When I run the program, I can see a= n > LED flash briefly when attached to the TX line. > > I've put in a support request to the motor controller mfg. also. Do you have one of the early breakout-gs boards (R277)? The Vcc on that version of the board isn't at 3.3v but rather at the supply voltage which might be causing a problem. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@in...> - 2005-10-30 20:50:42
|
I think the board I have is rev 277, although if this is an old revision that is strange since I just purchased it. What can I do to fix this? Brian Gregory -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Dave Hylands Sent: Sunday, October 30, 2005 12:56 AM To: gum...@li... Subject: Re: [Gumstix-users] Newbie GPIO question Hi Brian, On 10/29/05, Brian Gregory <br...@in...> wrote: > I'm using the logic level output from the breakout-gs board. > The motor controller is here: http://www.pololu.com/products/pololu/0410/ Hmm. That should work fine. There was a labelling error on the breakout GS (rev 277) with the i2c and STUART ports. The port names are correct, but the pins are swapped. Just to review: 1 - Have you configured the GPIO lines? echo "AF2 in" > /proc/gpio/GPIO46 echo "AF1 out" > /proc/gpio/GPIO47 2 - Have you tried the sertest.c program? http://websvn.gumstix.com/listing.php?repname=Buildroot&path=%2Fbranches%2Fp rojects%2Frobostix%2Fgumstix%2F&rev=0&sc=0 You should be able to compile it using the provided Makefile. Create a directory called robostix in the directory that contains gumstix-buildroot, and create a subdirectoy called gumstix in side the robostix directory. Put the Makefile and sertest.c inside the gumstix directory and do a make sertest (from within the robostix/gumstix directory) to build it. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Dave H. <dhy...@gm...> - 2005-10-30 22:38:47
|
Hi Brian, On 10/30/05, Brian Gregory <br...@in...> wrote: > I think the board I have is rev 277, although if this is an old revision > that is strange since I just purchased it. What can I do to fix this? I'm not sure whether a newer revision has been released or not (mine is 277 as well). Depending on your power source, you'd either need to use a 3.3v regulator, or if you have an already regulated source, you could use a resistor network to get the desired voltage. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Brian G. <br...@in...> - 2005-10-30 23:03:29
|
Interesting, the basic stamp that I was using to test outputs at 5V, and my power supply for the gumstix is currently the wall wart, which I believe is 5V. (Therefore the serial VCC should be 5V) I guess the only mismatch is the reset line that I'm running from a GPIO is 3.3V. The manual for the controller expects the reset line to be at "supply level". I wonder if that's all I'll have to do. Would it be dangerous to use a GPIO at the 3.3V supply to test my theory? Brian Gregory |
From: Brian G. <br...@in...> - 2005-10-30 23:30:48
|
I just took some voltages on the breakout board: VCC: 3.288V GPIO (after "set"): 3.314V TX (STUART): 3.315V (before & after setup) 0V (after transmit program) Brian Gregory |