Markus Kalkbrenner / Mbed 2 deprecated Pinscape_Controller

work in progress

Dependencies:   FastAnalogIn FastIO USBDevice mbed FastPWM SimpleDMA

Fork of Pinscape_Controller by Mike R

TSL1410R/tsl410r.cpp@14:df700b22ca08, 2014-09-26 (annotated)

Committer:
mjr
Date:
Fri Sep 26 20:51:02 2014 +0000
Revision:
14:df700b22ca08
Parent:
6:cc35eb643e8f
Child:
17:ab3cec0c8bf4
Reduce button input latency by reducing debounce time and polling during CCD read cycle

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mjr 2:c174f9ee414a 1 #include "mbed.h"
mjr 2:c174f9ee414a 2 #include "tsl1410r.h"
mjr 2:c174f9ee414a 3
mjr 2:c174f9ee414a 4 TSL1410R::TSL1410R(PinName siPort, PinName clockPort, PinName aoPort)
mjr 2:c174f9ee414a 5 : si(siPort), clock(clockPort), ao(aoPort)
mjr 2:c174f9ee414a 6 {
mjr 2:c174f9ee414a 7 // clear out power-on noise by clocking through all pixels twice
mjr 2:c174f9ee414a 8 clear();
mjr 2:c174f9ee414a 9 clear();
mjr 2:c174f9ee414a 10 }
mjr 2:c174f9ee414a 11
mjr 2:c174f9ee414a 12 void TSL1410R::clear()
mjr 2:c174f9ee414a 13 {
mjr 2:c174f9ee414a 14 // clock in an SI pulse
mjr 2:c174f9ee414a 15 si = 1;
mjr 2:c174f9ee414a 16 clock = 1;
mjr 2:c174f9ee414a 17 clock = 0;
mjr 2:c174f9ee414a 18 si = 0;
mjr 2:c174f9ee414a 19
mjr 2:c174f9ee414a 20 // clock out all pixels
mjr 2:c174f9ee414a 21 for (int i = 0 ; i < nPix + 1 ; ++i) {
mjr 2:c174f9ee414a 22 clock = 1;
mjr 2:c174f9ee414a 23 clock = 0;
mjr 2:c174f9ee414a 24 }
mjr 2:c174f9ee414a 25 }
mjr 2:c174f9ee414a 26
mjr 14:df700b22ca08 27 void TSL1410R::read(uint16_t *pix, int n, void (*cb)(void *ctx), void *cbctx, int cbcnt)
mjr 2:c174f9ee414a 28 {
mjr 6:cc35eb643e8f 29 // start the next integration cycle by pulsing SI and one clock
mjr 2:c174f9ee414a 30 si = 1;
mjr 2:c174f9ee414a 31 clock = 1;
mjr 2:c174f9ee414a 32 clock = 0;
mjr 2:c174f9ee414a 33 si = 0;
mjr 2:c174f9ee414a 34
mjr 2:c174f9ee414a 35 // figure how many pixels to skip on each read
mjr 2:c174f9ee414a 36 int skip = nPix/n - 1;
mjr 14:df700b22ca08 37
mjr 14:df700b22ca08 38 // figure the callback interval
mjr 14:df700b22ca08 39 int cbInterval = nPix;
mjr 14:df700b22ca08 40 if (cb != 0)
mjr 14:df700b22ca08 41 cbInterval = nPix/(cbcnt+1);
mjr 2:c174f9ee414a 42
mjr 14:df700b22ca08 43 // read all of the pixels
mjr 14:df700b22ca08 44 for (int src = 0, dst = 0 ; src < nPix ; )
mjr 2:c174f9ee414a 45 {
mjr 14:df700b22ca08 46 // figure the end of this callback interval
mjr 14:df700b22ca08 47 int srcEnd = src + cbInterval;
mjr 14:df700b22ca08 48 if (srcEnd > nPix)
mjr 14:df700b22ca08 49 srcEnd = nPix;
mjr 2:c174f9ee414a 50
mjr 14:df700b22ca08 51 // read one callback chunk of pixels
mjr 14:df700b22ca08 52 for ( ; src < srcEnd ; ++src)
mjr 14:df700b22ca08 53 {
mjr 14:df700b22ca08 54 // read this pixel
mjr 14:df700b22ca08 55 pix[dst++] = ao.read_u16();
mjr 2:c174f9ee414a 56
mjr 14:df700b22ca08 57 // clock in the next pixel
mjr 2:c174f9ee414a 58 clock = 1;
mjr 2:c174f9ee414a 59 clock = 0;
mjr 14:df700b22ca08 60
mjr 14:df700b22ca08 61 // clock skipped pixels
mjr 14:df700b22ca08 62 for (int i = 0 ; i < skip ; ++i, ++src)
mjr 14:df700b22ca08 63 {
mjr 14:df700b22ca08 64 clock = 1;
mjr 14:df700b22ca08 65 clock = 0;
mjr 14:df700b22ca08 66 }
mjr 2:c174f9ee414a 67 }
mjr 14:df700b22ca08 68
mjr 14:df700b22ca08 69 // call the callback, if we're not at the last pixel
mjr 14:df700b22ca08 70 if (cb != 0 && src < nPix)
mjr 14:df700b22ca08 71 (*cb)(cbctx);
mjr 2:c174f9ee414a 72 }
mjr 2:c174f9ee414a 73
mjr 2:c174f9ee414a 74 // clock out one extra pixel to leave A1 in the high-Z state
mjr 2:c174f9ee414a 75 clock = 1;
mjr 2:c174f9ee414a 76 clock = 0;
mjr 2:c174f9ee414a 77 }