[A few question on systick]

Banging your head against the wall has a very good side effect, you learn a lot and probably you will never forget that.

 

Simao

[uDMA SPI doubt]

     Hi there, please bear with me, english is not my mother tongue, I have a doubt about  SPI reading through udma.
     In order to get the clock to perform a reading of spi via udma , Do I need to start a udma write  also in the TX channel, or as soon as I start the RX udma all the clocks are generated internaly without any further write. I mean, after the first write (dummy) which will start the receiving proccess??
     I hope i've made myself clear.

Thanks in advance

Simao

[I can´t undertand SysCtlClockGet() behaviour]

     Acctually it worked already, my concern is about the value I get when I call SysCtlClockGet(), I guess I have to dig into KEIL help files to know what is happening but freq is OK.

     Thanks again.

 

Simao

[I can´t undertand SysCtlClockGet() behaviour]

     Thanks a lot for your explanation. I´ll try your tip for 80Mhz and I`ll keep you informed.

 

 

Simão

[I can´t undertand SysCtlClockGet() behaviour]

     Hi there, I would really appreciate any  help here. Assuming ClockVal defined as

 

unsigned long Clockval=0

     After executing this 2 lines of code...    
     

SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);
 
ClockVal = SysCtlClockGet();

     What should be the correct value of Clockval? A friend of mine reported 40,000.000  meaning 40 Mhz using IAR, in my case running Keil I get 3,200000 or 3.2 Mhz, does abybody have a clue for this weird value??

Thanks a lot in advance

 

Simao

 

 

P.S.  1) We both use Stellaris LM4F120 LaunchPad Evaluation Kit

 

P.S.  2) It´s my first post so please bear with me if it´s not formaly correct.

[Using Stellaris Launchpad as a Thermometer]

Thanks a lot for sharing, as a begginer (myself) it´s going to be a huge help, I´m using KEIL but it was very simple to port it, worked in the first try. 

 

Simao