Kentaro Okuda / MAX6955

MAX6955 LED driver

MAX6955.cpp@2:f6c4ed9cbf0e, 2018-08-11 (annotated)

Committer:
Kentaro Okuda
Date:
Sat Aug 11 10:56:18 2018 -0400
Revision:
2:f6c4ed9cbf0e
Parent:
1:8936ddb97551
Child:
3:fbcb79f6e0a8
refactoring

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Kentaro Okuda 1:8936ddb97551 1 /**
Kentaro Okuda 1:8936ddb97551 2 * @file MAX6955.cpp
Kentaro Okuda 1:8936ddb97551 3 */
Kentaro Okuda 1:8936ddb97551 4
lonesometraveler 0:8c7de3096cac 5 #include "MAX6955.h"
lonesometraveler 0:8c7de3096cac 6
lonesometraveler 0:8c7de3096cac 7 MAX6955::MAX6955(PinName sda, PinName scl, char driver): i2c_(sda, scl), driver_(driver){}
lonesometraveler 0:8c7de3096cac 8
Kentaro Okuda 2:f6c4ed9cbf0e 9 static void prepareString(char* buffer, char* i2cData) {
Kentaro Okuda 2:f6c4ed9cbf0e 10 for (int i = 0; i < 8; i++) {
Kentaro Okuda 2:f6c4ed9cbf0e 11 if (buffer[i] < 32 || buffer[i] > 126) { // make sure its printable
Kentaro Okuda 2:f6c4ed9cbf0e 12 i2cData[i+1] = 32; // if not, replace it with "space"
Kentaro Okuda 2:f6c4ed9cbf0e 13 } else {
Kentaro Okuda 2:f6c4ed9cbf0e 14 i2cData[i+1] = buffer[i];
Kentaro Okuda 2:f6c4ed9cbf0e 15 }
Kentaro Okuda 2:f6c4ed9cbf0e 16 }
Kentaro Okuda 2:f6c4ed9cbf0e 17 }
Kentaro Okuda 1:8936ddb97551 18
Kentaro Okuda 1:8936ddb97551 19 int MAX6955::write(char command, char data) {
lonesometraveler 0:8c7de3096cac 20 char i2cData[2];
lonesometraveler 0:8c7de3096cac 21 i2cData[0] = command;
lonesometraveler 0:8c7de3096cac 22 i2cData[1] = data;
lonesometraveler 0:8c7de3096cac 23 int result = i2c_.write(driver_, i2cData, 2);
lonesometraveler 0:8c7de3096cac 24 wait(0.07);
lonesometraveler 0:8c7de3096cac 25 return result;
lonesometraveler 0:8c7de3096cac 26 }
lonesometraveler 0:8c7de3096cac 27
Kentaro Okuda 1:8936ddb97551 28 int MAX6955::writeS(char* buffer) {
Kentaro Okuda 1:8936ddb97551 29 char i2cData[9];
Kentaro Okuda 1:8936ddb97551 30 i2cData[0] = 0x20; // first digit
Kentaro Okuda 2:f6c4ed9cbf0e 31 prepareString(buffer, i2cData);
Kentaro Okuda 1:8936ddb97551 32 int result = i2c_.write(driver_, (char *) i2cData, 9);
lonesometraveler 0:8c7de3096cac 33 wait(0.07);
lonesometraveler 0:8c7de3096cac 34 return result;
lonesometraveler 0:8c7de3096cac 35 }
lonesometraveler 0:8c7de3096cac 36
Kentaro Okuda 1:8936ddb97551 37 int MAX6955::init(void) {
lonesometraveler 0:8c7de3096cac 38 int result = 0;
lonesometraveler 0:8c7de3096cac 39 result = result + write(reg_decodeMode, 0x00);
lonesometraveler 0:8c7de3096cac 40 result = result + write(reg_scanLimit, 0x07);
lonesometraveler 0:8c7de3096cac 41 result = result + write(reg_configuration, 0x21);
lonesometraveler 0:8c7de3096cac 42 result = result + write(reg_globalIntensity, 0x08);
lonesometraveler 0:8c7de3096cac 43 result = result + write(reg_digitType, 0xFF);
lonesometraveler 0:8c7de3096cac 44 result = result + write(reg_displayTest, 0x00);
lonesometraveler 0:8c7de3096cac 45 return result;
lonesometraveler 0:8c7de3096cac 46 }