sol25 0 Posted August 27, 2014 Share Posted August 27, 2014 Hi everyone! This is my second time on the forum. The first time i was here it was to ask for help with interrupts and an LED display. 43oh was very helpful and I accomplished my goal. Today I am here to ask for help again. Goal: Implement the code previously written into the chip only and drive it without the development board. (breadboard mode) I did some research and most post/websites told me that all i need is 3.3V and a 47k resistor going from VCC to the RST pin on the chip and that my program would start working... I tried this and it did not. reference:http://crossplatform.net/running-msp430-launchpad-on-a-breadboard/ My question is, since I am working with interrupts and my code is a bit complicated, would i need an external clock/crystal? What do i need to move away from the development board and onto the breadboard? Thanks in advanced, everyone here is so helpful!! Quote Link to post Share on other sites
RobG 1,892 Posted August 27, 2014 Share Posted August 27, 2014 The only things necessary to get your MSP working are: power on Vcc pin, GND on GND pin, and Vcc on RST pin. 47k is needed if you want to do in-circuit programming (in that case you should also add 1nF cap from RST to GND.) sol25 1 Quote Link to post Share on other sites
spirilis 1,265 Posted August 27, 2014 Share Posted August 27, 2014 well, 0.1uF cap across Vcc/GND too Programming may work fine without the 1nF cap between RST and GND, although I haven't tried that on a breadboard. RobG and sol25 2 Quote Link to post Share on other sites
Antscran 35 Posted August 27, 2014 Share Posted August 27, 2014 The Launchpad user guide has a nice circuit diagram to follow if need be, and has all the components already mentioned, see page 16 for the MSP430G Launchpad. http://www.ti.com/lit/ug/slau318e/slau318e.pdf sol25 1 Quote Link to post Share on other sites
rockets4kids 204 Posted August 28, 2014 Share Posted August 28, 2014 http://forum.43oh.com/topic/799-using-the-launchpad-with-a-breadboard/ sol25 1 Quote Link to post Share on other sites
sol25 0 Posted August 28, 2014 Author Share Posted August 28, 2014 @@RobG. @@spirilis, @@Antscran, @@rockets4kids you guys have all been very helpful! As far as code? I am using energia, Im not sure if i need to set up a DCO or Flash cmd file into energia to run it on the breadboard? I tried the cap and the resistor and i still cant get it to run. I know in CCS i can set up the DCO and program in flash, im just not sure how to do that, or if energia does that. Quote Link to post Share on other sites
bobnova 59 Posted August 28, 2014 Share Posted August 28, 2014 Energia sets the chip up to run 16MHz via the internal oscillator(s?), the external crystal is typically for an optional 32.768kHz crystal for RTC use. It's not used for the core clock in Energia, nor in most setups. Regardless of what you're programming it with, you really shouldn't need anything more than VCC (2.0v to 3.6v), GND, a cap from VCC to GND, and a pullup resistor on RST(reset). sol25 1 Quote Link to post Share on other sites
sol25 0 Posted August 28, 2014 Author Share Posted August 28, 2014 Thanks everyone! with all of your help, I got it working! Quote Link to post Share on other sites
abecedarian 330 Posted August 28, 2014 Share Posted August 28, 2014 Just for reference, page 21 of the G2553 datasheet recommends 2.2v-3.6v for programming, and on the same page Figure 1 is a graph reflecting voltage versus processor speeds and minimum required VCC for programming. bobnova 1 Quote Link to post Share on other sites
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