Hi, I'm using LPC935 and I want to set the built in AD converter. I have to use P0.0 pin, so I have written the following code (The pin is configured as input only): void InitADC() { ADCON0 = 0x45; //Enable ADC0 and Interrupt on conversion done //Single mode ADMODA = 0x01; //Freq div ADMODB = 0x40; //CCLK/3 //Select P00 ADINS = 0x01; //Enable P00 input EAD = EA = 1; //Enable IRQ } The matter is that even I run this piece of code the ADC settings are still the same. Even if I play step by step, every line of this routine can't make any modificatione in ADC registers. What's the matter? Thanx in advance
Then you do NOT have a bondout chip and you can NOT emulate. Erik Is it not amazing how simple an answer can be when all facts come to light. Please keep that in mind next time you post 1) chip 2) frequency 3) type of board (my own/ Keil / acme ...) 4) code snipped (if appropiate) 5) tool(s)
Why? if I can truly emulate serial communications, analog comparator functions and so on why i can't emulate ADC?
if I can truly emulate serial communications, analog comparator functions and so on why i can't emulate ADC? Because you do not have the bondout chip (which is, without actually counting, I think, 64 pins) that allow the emulator to "see" everything that goes on inside the uC and STOP it on the spot. There are means of "emulating" which are not "true emulation" since they are code intrusive (e.g. reformat the code and write the flash to insert a "call brkpt" and such "emulators" do not STOP, they just stop. Thus a few operations such as an ADC completing conversion can happen before the STOP is reached. Such "emulators" are a hybrid and can by design never be completely "true". Whether this is what you actually have and see I do not know. A suggestion: set the SFR you refer to, IMMEDIATELY read it to a RAM location (a variable) then breakpoint and check that variable, not the SFR. That way you will know if it is the SFR or the emulator that fail (I assume you have verified that you can "watch" variables). One last possibility: are you dead sure that you are working with a 935 CHIP, not a 932? Erik
the chip is really a 935. I've followed your suggestione and i've written the code: void InizADC(void) { char Dummy; // configure clock divider ADMODB |= 0x40; Dummy = ADMODB; ... Dummy is equal to ADMODB that is equal to 0x00! By the way I thank u to waste your time trying to help me.
By the way I thank u to waste your time trying to help me. I have seen no attempt from micro to help you, what are you talking about? Erik
I thank YOU not the micro!
,i>I thank u 'u' is an abbreviation for micro.
Are you using the latest version of the LPC Studio? http://www.keil.com/update/sw/c51lpc/08.2005 Reinhard
Hi Reinhard, no I haven't, anyway the latest version of LPC Studio doesn't contain modifcations related to 935: i've seen in official site that there are new chips supported, nothing more. So far I did not fix my problem: I can't program ADC registers while I'm working with emulator!