# A/D converter of LPC2129

Started by September 2, 2004
 Hi everyone, I'm having some problems with using the A/D converter of the LPC2129 ARM board. I'm interfacing the board with an LM35DZ temperature sensor which has an output voltage proportional to the required temperature (eg 0.68V is equal to 68 degrees C). I have set up the A/D control as follows: ADCR = 0x00270601 ADCR |= 0x01000000 Is the above set up suitable? Also, assuming I have gotten a value from the A/D data (ADDR), how do I extract this value and get a suitable value for the temperature (i.e. if analogue input is 0.25V for instance)? I would greatly appreciate it if someone can help me with this or if someone is willing to share some example code. Thank you! Daniela.
 here's the code im using: for setting it up, using a PCLK of 60Mhz ADCR = 0x00210E01; set up ADC AIN0, @PCLK/15 =4MHz, 10bit ADCR = 0x01000000; to read the ADC: int value; if (ADDR & 0x80000000) // wait for the conversion to finish { value = ADDR; value = ((value>>6) & 0x03FF); // extract the data } and thats it... dont forguet to set up the pin as ADC. -----Original Message----- From: daniela_boyo [mailto:] Sent: 02 September 2004 12:24 To: Subject: [lpc2000] A/D converter of LPC2129 Hi everyone, I'm having some problems with using the A/D converter of the LPC2129 ARM board. I'm interfacing the board with an LM35DZ temperature sensor which has an output voltage proportional to the required temperature (eg 0.68V is equal to 68 degrees C). I have set up the A/D control as follows: ADCR = 0x00270601 ADCR |= 0x01000000 Is the above set up suitable? Also, assuming I have gotten a value from the A/D data (ADDR), how do I extract this value and get a suitable value for the temperature (i.e. if analogue input is 0.25V for instance)? I would greatly appreciate it if someone can help me with this or if someone is willing to share some example code. Thank you! Daniela. Yahoo! Groups Links
 Hi, Thanks very much for your help. I tried out the code you sent and it works perfectly! Best regards, Daniela. --- In , "Fuentes Rodriguez, M.E." wrote: > here's the code im using: > > for setting it up, using a PCLK of 60Mhz > > ADCR = 0x00210E01; set up ADC AIN0, @PCLK/15 =4MHz, 10bit > ADCR = 0x01000000; > > to read the ADC: > int value; > if (ADDR & 0x80000000) // wait for the conversion to finish > { > value = ADDR; > value = ((value>>6) & 0x03FF); // extract the data > } > and thats it... dont forguet to set up the pin as ADC. > > -----Original Message----- > From: daniela_boyo [mailto:dob3@l...] > Sent: 02 September 2004 12:24 > To: > Subject: [lpc2000] A/D converter of LPC2129 > Hi everyone, > > I'm having some problems with using the A/D converter of the LPC2129 > ARM board. I'm interfacing the board with an LM35DZ temperature > sensor which has an output voltage proportional to the required > temperature (eg 0.68V is equal to 68 degrees C). > > I have set up the A/D control as follows: > > ADCR = 0x00270601 > ADCR |= 0x01000000 > > Is the above set up suitable? Also, assuming I have gotten a value > from the A/D data (ADDR), how do I extract this value and get a > suitable value for the temperature (i.e. if analogue input is 0.25V > for instance)? > > I would greatly appreciate it if someone can help me with this or if > someone is willing to share some example code. > > Thank you! > Daniela. > > > Yahoo! Groups Links