Joe Danlloh
/
digitalPot
ddd
Fork of EthernetTester by
main.cpp@1:818e764b86f2, 2017-08-03 (annotated)
- Committer:
- idijoeteque
- Date:
- Thu Aug 03 10:26:55 2017 +0000
- Revision:
- 1:818e764b86f2
- Parent:
- 0:83f7908c81b1
dd
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
no2chem | 0:83f7908c81b1 | 1 | #include "mbed.h" |
idijoeteque | 1:818e764b86f2 | 2 | |
idijoeteque | 1:818e764b86f2 | 3 | |
no2chem | 0:83f7908c81b1 | 4 | |
idijoeteque | 1:818e764b86f2 | 5 | void setup() { |
idijoeteque | 1:818e764b86f2 | 6 | //setup SPI, 8 bit data, high steady state clock, |
idijoeteque | 1:818e764b86f2 | 7 | //second edge capture, 1MHz clock rate |
idijoeteque | 1:818e764b86f2 | 8 | spi.format(8,3); |
idijoeteque | 1:818e764b86f2 | 9 | spi.frequency(1000000); |
idijoeteque | 1:818e764b86f2 | 10 | } |
no2chem | 0:83f7908c81b1 | 11 | |
idijoeteque | 1:818e764b86f2 | 12 | void loop() { |
idijoeteque | 1:818e764b86f2 | 13 | for(int level=0; level<255; level++) { |
idijoeteque | 1:818e764b86f2 | 14 | digitalPotWrite(level); |
idijoeteque | 1:818e764b86f2 | 15 | wait(0.1); |
idijoeteque | 1:818e764b86f2 | 16 | } |
idijoeteque | 1:818e764b86f2 | 17 | //wait a second at the top |
idijoeteque | 1:818e764b86f2 | 18 | wait(1); |
idijoeteque | 1:818e764b86f2 | 19 | for(int level = 0; level < 255; level++) { |
idijoeteque | 1:818e764b86f2 | 20 | digitalPotWrite(255-level); |
idijoeteque | 1:818e764b86f2 | 21 | wait(0.1); |
no2chem | 0:83f7908c81b1 | 22 | } |
no2chem | 0:83f7908c81b1 | 23 | |
idijoeteque | 1:818e764b86f2 | 24 | void digitalPotWrite(int addresss, int value) { |
idijoeteque | 1:818e764b86f2 | 25 | //take the SS pin low to select the chip |
idijoeteque | 1:818e764b86f2 | 26 | cs = 0; |
idijoeteque | 1:818e764b86f2 | 27 | //send in the address and value via SPI |
idijoeteque | 1:818e764b86f2 | 28 | spi.write(address); |
idijoeteque | 1:818e764b86f2 | 29 | spi.write(value); |
idijoeteque | 1:818e764b86f2 | 30 | //take the SS pin high to deselect the chip |
idijoeteque | 1:818e764b86f2 | 31 | cs = 1; |
idijoeteque | 1:818e764b86f2 | 32 | } |