In this tutorial, we are going to discuss how to use the inbuilt LPC2148 ADC and the register associated with it Later we will see how to interface a POT, LDR, Temp Sensor(LM35). LPC2148 has an inbuilt 10-bit Successive Approximation ADC which is multiplexed among 6/8 input pins of ADC0/ADC1. The ADC reference voltage is measured across GND to VREF, meaning it can do the conversion within this range. Usually, the VREFPis connected to VDD. As LPC2148 works on 3. 3 volts, this will be the ADC reference voltage. Now the $$resolution of ADC = 3. 3/(2^{10}) = 3. 3/1024 =0. 003222 = 3. 2mV$$ The below block diagram shows the ADC input pins multiplexed with other GPIO pins. The ADC pin can be enabled by configuring the corresponding PINSEL register to select ADC function. When the ADC function is selected for that pin in the Pin Select register, other Digital signals are disconnected from the ADC input pins. Adc Channel Port Pin Pin Functions Associated PINSEL Register AD0. 1 P0_28 0-GPIO, 1- AD0.
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Configure the GPIO pin for ADC function using PINSEL register. Enable the CLock to ADC module. Deselect all the channels and Power on the internal ADC module by setting bit. Select the Particular channel for A/D conversion by setting the corresponding bits in Set the bit for starting the A/D conversion for selected channel. Wait for the conversion to complete, bit will be set once conversion is over. Read the 10-bit A/D value from Use it for further processing or just display on LCD. Example 1 Here we are going to do the A/D conversion for only AD0. 1. The result of the A/D conversion will be displayed on the LCD. Using Explore Embedded Libraries In the above example, we discussed how to configure and use the inbuilt LPC1768 ADC. Now we will see how to use the exploreEmbededd ADC library to interface POT, LDR and Temperature Sensor(LM35). Download the complete project folder from this link Have a opinion, suggestion, question or feedback about the article let it out here!
Below are the registers, that we are going to use to blink LED. 1) PINSEL/IOSEL: PINSEL/IOSEL are 16 bit wide registers, used for setting the function of the PIN. Function can be either GPIO or Alternate Function. There are 3 PINSEL registers in LPC2148 i. e. PISEL0/IOSEL0 ( PORT0. 0-PORT0. 15), PINSEL1/IOSEL1 ( PORT0. 16-PORT0. 31) and PINSEL2/IOSEL2 ( PORT1. 16-PORT1. 31). As you can see in the picture below, setting different bits will change the function of the Pins. However, to use the GPIO, we have to set it to 0. PINSEL Register 2) IODIR: GPIO Port Direction control register. IODIR are 32 bit wide registers, used for setting the direction of the PIN. Direction can be either input or output. Writing 1 to a particular bit will set the PIN as output and writing 0 will set the PIN as input. Threre are 2 IODIR registers i. IODIR0 (PORT0. 31) and IODIR1 (PORT1. 0-PORT1. For eg- if we want to set PIN 3 of PORT0 as output, IODIR0 = 0x00000008; Here all other PINs except PIN 3 are set as input (because they are all 0s) and PIN 3 is output (It is 1).
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master 1 branch 0 tags Go to file Code Clone Use Git or checkout with SVN using the web URL. Open with GitHub Desktop Download ZIP Latest commit Git stats 3 commits Files Permalink Failed to load latest commit information. Type Name Latest commit message Commit time ARM7 udzbenik Blueboard (1) MProg 3. 5 NGX parallel port All docs and sample programs for LCP2148 Blueboard NGX About Resources Readme Releases No releases published Packages No packages published
Bit 15:8 – CLCKDIV: Clock Divisor The APB clock (PCLK_ADC0) is divided by (this value plus one) to produce the clock for the A/D converter, which should be less than or equal to 13 MHz. Bit 16 – BURST This bit is used for BURST conversion. If this bit is set the ADC module will do the conversion for all the channels that are selected(SET) in SEL bits. CLearing this bit will disable the BURST conversion. Bit 20 – CLKS This field selects the number of clocks used for each conversion in Burst mode, and the number of bits of accuracy of the result in the RESULT bits of ADDR, between 11 clocks (10 bits) and 4 clocks (3 bits). 000-11 clocks / 10 bits accuracy 001-10 clocks / 9 bits accuracy 010- 9 clocks / 8 bits accuracy 011- 8 clocks / 7 bits accuracy 100- 7 clocks / 6 bits accuracy 101- 6 clocks / 5 bits accuracy 110- 5 clocks / 4 bits accuracy 111- 4 clocks / 3 bits accuracy Bit 21 – PDN: Power Down Mode Setting this bit brings ADC out of power down mode and makes it operational. Clearing this bit will power down the ADC.
This is because the LED is connected to the P0. 21, and need to be set as output. while ( 1) { IOSET0 |= ( 1 << 21); // set P0. 21 as HIGH delay (); IOCLR0 |= ( 1 << 21); // Set P0. 21 as LOW delay ();} Inside the while loop, I am performing this toggle for the LED. IOSET0 |= (1<<21); sets the LED as HIGH IOCLR0 |= (1<<21); clears the LED pin. delay (); waits for some time. It is defined below void delay ( void) unsigned long time = 1000000; while ( time --); // this will keep executing untill time becomes 0} YOU CAN DOWNLOAD FULL CODE AT THE END OF THIS POST RESULT ResultLPCLED Check out the VIDEO Below You can buy me a coffee sensor 🙂
Bit 24:26 – START When the BURST bit is 0, these bits control whether and when an A/D conversion is started: 000 - Conversion Stopped 001- Start Conversion Now The remaining cases (010 to 111) are about starting conversion on occurrence of edge on a particular CAP or MAT pin. Bit 27 - EDGE This bit is significant only when the START field contains 010-111. It starts conversion on selected CAP or MAT input. 0 - On Falling Edge 1 - On Rising Edge ADGDR ( ADC Global Data Register) 31 30 23:16 15:6 5:0 DONE OVERRUN CHN RESULT Bit 15:6 - RESULT This field contains the 10bit A/D conversion value for the selected channel in The value from this register should be read only after the conversion is complete ie DONE bit is set. Bit 26:24 - CHN: Channel These bits contain the channel number for which the A/D conversion is done and the converted value is available in RESULT bits(e. g. 000 identifies channel 0, 011 channel 3... ). Bit 30 - OVERRUN This bit is set during the BURST mode where the previous conversion data is overwritten by the new A/D conversion value.