Re: [psas-avionics] Need help understanding SMBus
Andrew, I think this may be what you want, or at least give you some leads. Application Report How to Operate bq20z7x/8x/9x Fuel Gauge and bq24707/25/26 Charger w/o Host Cntroller SLUA608 – PDF 153.2KB 2011-08-31 (6 pages) http://www.ti.com/lit/an/slua608/slua608.pdf Thanks, Keith == On Tue, Mar 6, 2012 at 11:56 PM, Andrew Greenberg wrote: > Hi! > > If there is someone out there who actually understands how SMBus works > in an real system, could you please email me? Or if you know someone who > knows, could you have them email me? > > We're trying to hunt down these questions: > > - You have a smart battery and smart battery charger on the same SMBus. > But something has to tell the smart battery charger to actually start > charging? If so, who does this? Who asks the battery about its charge > rate and capacity, checks that there's sufficient shore power, and then > turns on battery charging? Is this the "embedded controller"? > > - Assuming it's the "embedded controller" that does this coordination, > especially when the host is off, are there generic controllers out > there? Or does everyone just throw a microcontroller at this? > > Thanks! > > Andrew > > -- > --- > Andrew Greenberg > > Portland State Aerospace Society (http://psas.pdx.edu/) > and...@psas.pdx.edu C: 503.708.7711 > --- > > ___ > psas-avionics mailing list > psas-avionics@lists.psas.pdx.edu > http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics ___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
[psas-avionics] Need help understanding SMBus
Hi! If there is someone out there who actually understands how SMBus works in an real system, could you please email me? Or if you know someone who knows, could you have them email me? We're trying to hunt down these questions: - You have a smart battery and smart battery charger on the same SMBus. But something has to tell the smart battery charger to actually start charging? If so, who does this? Who asks the battery about its charge rate and capacity, checks that there's sufficient shore power, and then turns on battery charging? Is this the "embedded controller"? - Assuming it's the "embedded controller" that does this coordination, especially when the host is off, are there generic controllers out there? Or does everyone just throw a microcontroller at this? Thanks! Andrew -- --- Andrew Greenberg Portland State Aerospace Society (http://psas.pdx.edu/) and...@psas.pdx.edu C: 503.708.7711 --- ___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
Re: [psas-avionics] need help
Thanks Dave ! From: Dave Camarillo To: Nagasrinivas Pinjala Cc: psas-avionics Sent: Friday, September 16, 2011 10:26 PM Subject: Re: [psas-avionics] need help Hi Naga, A couple of notes and comments that should be helpful... -On the LPC series of MCU's, you'll be looking for the pins that can be configured as EINT# pins. These will allow for a state change on the input pin to trigger an interrupt handler on the MCU. -In the manual, there is a section on the vectored interrupt controller. It will be critical that you read and understand this chapter. The general process is to assign the address of the function handler to the respective VIC register, configure the peripheral, and enable the interrupt. -When implementing the interrupt function, it's almost identical to a normal function, however the function prolong and epilogue is modified with compiler directives and/or assembler code. An example can be found in the psas freertos-5.1.2 repo, under LPCUSBIntegrationTesting/usb.c. There are two primary methods of modifying the function. The first is using the compiler directive, which may or may not be broken, depending on the version of gcc your running. The second is to mark the function as naked and provide assembler instructions at the beginning and end of the function to save and restore context. I think this should get you started in the right direction... Regards, -Dave On Fri, Sep 16, 2011 at 7:52 PM, Nagasrinivas Pinjala wrote: > Hi, > > I wish to write an interrupt based program for LPC2378 board. It involves > one of the two user buttons and the LED. Following is the algorithm for the > program: > 1.Choose a button > 2.Set the relevant pin as the input > 3.Check if the button is pressed > if yes - send an interrupt to the micro-controller which then lights the > LED > if no - do nothing > I need guidance as to how to write an interrupt function in C, what are the > compiler directives, and what are the registers I need to deal with. > Any help would be greatly appreciated. > > Thanks, > Naga. > > ___ > psas-avionics mailing list > psas-avionics@lists.psas.pdx.edu > http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics > >___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
Re: [psas-avionics] need help
Thanks a lot, K! From: K Wilson To: Nagasrinivas Pinjala Cc: psas-avionics Sent: Saturday, September 17, 2011 9:35 AM Subject: Re: [psas-avionics] need help On Fri, Sep 16, 2011 at 7:52 PM, Nagasrinivas Pinjala wrote: > >I need guidance as to how to write an interrupt function in C, what are the >compiler directives, and what are the registers I need to deal with. > > On function attributes in gcc: http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function-Attributes As another example you can look at the liblpc23xx/lpc23xx-i2c/lpc23xx-i2c.c and liblpc23xx/lpc23xx-i2c/include/lpc23xx-i2c.h files. The interrupt routine is i2c0_isr(). The interrupt initialization is in the i2c_init(...) function. -K___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
Re: [psas-avionics] need help
On Fri, Sep 16, 2011 at 7:52 PM, Nagasrinivas Pinjala wrote: > > I need guidance as to how to write an interrupt function in C, what are the > compiler directives, and what are the registers I need to deal with. > > On function attributes in gcc: http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function-Attributes As another example you can look at the liblpc23xx/lpc23xx-i2c/lpc23xx-i2c.c and liblpc23xx/lpc23xx-i2c/include/lpc23xx-i2c.h files. The interrupt routine is i2c0_isr(). The interrupt initialization is in the i2c_init(...) function. -K ___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
Re: [psas-avionics] need help
Hi Naga, A couple of notes and comments that should be helpful... -On the LPC series of MCU's, you'll be looking for the pins that can be configured as EINT# pins. These will allow for a state change on the input pin to trigger an interrupt handler on the MCU. -In the manual, there is a section on the vectored interrupt controller. It will be critical that you read and understand this chapter. The general process is to assign the address of the function handler to the respective VIC register, configure the peripheral, and enable the interrupt. -When implementing the interrupt function, it's almost identical to a normal function, however the function prolong and epilogue is modified with compiler directives and/or assembler code. An example can be found in the psas freertos-5.1.2 repo, under LPCUSBIntegrationTesting/usb.c. There are two primary methods of modifying the function. The first is using the compiler directive, which may or may not be broken, depending on the version of gcc your running. The second is to mark the function as naked and provide assembler instructions at the beginning and end of the function to save and restore context. I think this should get you started in the right direction... Regards, -Dave On Fri, Sep 16, 2011 at 7:52 PM, Nagasrinivas Pinjala wrote: > Hi, > > I wish to write an interrupt based program for LPC2378 board. It involves > one of the two user buttons and the LED. Following is the algorithm for the > program: > 1.Choose a button > 2.Set the relevant pin as the input > 3.Check if the button is pressed > if yes - send an interrupt to the micro-controller which then lights the > LED > if no - do nothing > I need guidance as to how to write an interrupt function in C, what are the > compiler directives, and what are the registers I need to deal with. > Any help would be greatly appreciated. > > Thanks, > Naga. > > ___ > psas-avionics mailing list > psas-avionics@lists.psas.pdx.edu > http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics > > ___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
[psas-avionics] need help
Hi, I wish to write an interrupt based program for LPC2378 board. It involves one of the two user buttons and the LED. Following is the algorithm for the program: 1.Choose a button 2.Set the relevant pin as the input 3.Check if the button is pressed if yes - send an interrupt to the micro-controller which then lights the LED if no - do nothing I need guidance as to how to write an interrupt function in C, what are the compiler directives, and what are the registers I need to deal with. Any help would be greatly appreciated. Thanks, Naga. ___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
Re: [psas-avionics] Need help with the IMU calibrator!
On Wed, Jan 02, 2008 at 09:26:10PM -0800, Andrew Greenberg wrote: > Hey everyone! > > A billion years ago, Tim and I made a spin table for calibrating > gyroscopes. Dan *just* got it to work using a bunch of his PIC/CAN > tools. Dave has now volunteered to port it to the LPC, but we need to > hack an LPC2148 board to get this to work. > > We have a beginning schematic, and we need someone to finish up the > schematic (very easy, trust us), work with Dave to figure out exact pin > out, and then solder up the whole thing. It's about 5+ hours of > soldering, I think. > > I'd totally do it, but I don't have time, and this is a GREAT first > project for someone. > > Anyone interested! I am. BTW I'll be on campus this saterday for a PARTS meeting. I could meet up with Dave around 3pm (at Hotlips?) and spend a few hrs on this. --mgross > > Andrew > > -- > --- > Andrew Greenberg > > Portland State Aerospace Society (http://psas.pdx.edu/) > [EMAIL PROTECTED] P: 503.788.1343 C: 503.708.7711 > --- > > ___ > psas-avionics mailing list > psas-avionics@lists.psas.pdx.edu > http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics signature.asc Description: Digital signature ___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
[psas-avionics] Need help with the IMU calibrator!
Hey everyone! A billion years ago, Tim and I made a spin table for calibrating gyroscopes. Dan *just* got it to work using a bunch of his PIC/CAN tools. Dave has now volunteered to port it to the LPC, but we need to hack an LPC2148 board to get this to work. We have a beginning schematic, and we need someone to finish up the schematic (very easy, trust us), work with Dave to figure out exact pin out, and then solder up the whole thing. It's about 5+ hours of soldering, I think. I'd totally do it, but I don't have time, and this is a GREAT first project for someone. Anyone interested! Andrew -- --- Andrew Greenberg Portland State Aerospace Society (http://psas.pdx.edu/) [EMAIL PROTECTED] P: 503.788.1343 C: 503.708.7711 --- ___ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
