We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
Hi In my project iam measuring the leak rate. The range of leak rate is 1.0E-11 to 1.0E-02.Up now I measured leak rate and displayed On the 7 segment display with 0.1 resolution. Here I used look up table method I taken hole Range values In the table and iam displaying the value for corresponding voltage . I stored values in the farm Of (1011 =1.0E-11) here "." ,"E","-" are constants. Now I want display the leak rate on BAR graph display. For 20 digits I have to take one led. The fallowing values I have to show on bar graph 1E-11, 3E-11, 5E-11, 7E-11, 9E-11, 1E-10, 3E-10, 5E-10…………………………………………2E-02 ex: 1E-11 = one led should glow 3E-11 = 2 leds should glow 5E-11 = 3 leds should glow : : : How to convert table values in to bar graph display. Thanks Regards
"If we write 50 IF LOOPS means program become large and complex." As already noted, there is no such thing as an "IF LOOP" 50 'if' statements doesn't even fill a single page of source code - that's not really a lot. And it certainly isn't complex: it is very simple indeed - just a lot of tedious repetition. And 'if' statements should compile to something fairly simple - so the generated code should not be that large or complex either. The alternative is to store the comparison values in an array, a use a loop to check through each value for each LED see Drew's example. This is actually more "complex" - since you still need to do exactly the same comparisons, but you have added the "overhead" of the array and the loop! The loop-based code may or may not be smaller, due to the space occupied by the array... Whichever actually turns out to be smaller, the difference is likely to be not terribly significant. Why don't you try both and post back your conclusions?
Thank for reply Iam using 50 Ifs in my program. IF value > threshold_1 THEN led1: = on; IF value > threshold_2 THEN led2: = on; IF value > threshold_1 THEN led3: = on; IF value > threshold_2 THEN led4: = on; IF value > threshold_1 THEN led5: = on; IF value > threshold_2 THEN led6: = on; . . . IF value > threshold_1 THEN led49 := on; IF value > threshold_2 THEN led50 := on; EX: 0000 0001 – led1 glow 0000 0011 – led2 glow 0000 0111 – led3 glow 0000 1111 – led4 glow 0001 1111 – led5 glow 0011 1111 – led6 glow 0111 1111 – led7 glow 1111 11111 – led8 glow How to send control word on to the PORT 6 times? How to display on the leds means what type of hardware I have to use? Regards Sri
"...what type of hardware I have to use?" So this is now off-topic - no longer a question about Keil tools. But I thought you'd already decided: "iam using HDSP4830 bar graph displays"
Avago Technologies; formerly Agilent; previously Hewlett-Packard (HP). As always, when using any electronic device, your first port of call should be the Support section of the manufacturer's website. There you should search for the Data sheet, Application Notes, and other supporting materials. Try this: http://www.avagotech.com/products/product-detail.jsp?navId=HDSP-4830
"EX: 0000 0001 – led1 glow 0000 0011 – led2 glow 0000 0111 – led3 glow 0000 1111 – led4 glow 0001 1111 – led5 glow 0011 1111 – led6 glow 0111 1111 – led7 glow 1111 11111 – led8 glow" Do you mean:
0000 0001 – LED 1 glows 0000 0011 – LEDs 1,2 glow 0000 0111 – LEDs 1,2,3 glow 0000 1111 – LEDs 1,2,3,4 glow 0001 1111 – LEDs 1,2,3,4,5 glow 0011 1111 – LEDs 1,2,3,4,5,6 glow 0111 1111 – LEDs 1,2,3,4,5,6,7 glow 1111 1111 – LEDs 1,2,3,4,5,6,7,8 glow
0000 0001 – LED 1 glows 0000 0010 – LED 2 glows 0000 0100 – LED 3 glows 0000 1000 – LED 4 glows 0001 0000 – LED 5 glows 0010 0000 – LED 6 glows 0100 0000 – LED 7 glows 1000 0000 – LEd 8 glows
http://para.maxim-ic.com/cache/en/results/4959.html