PCA9634.cpp

00001 
00002 #include "PCA9634.h"
00003 
00004 PCA9634::PCA9634(I2C *i2c, DigitalOut *inv_out_en, int addr)
00005 : i2c_(i2c), inv_out_en_(inv_out_en), addr_(addr) {
00006     *inv_out_en_ = 0;
00007     
00008     // Set Mode 1: Auto-increment on, oscillator on, do not respond to all-call
00009     writeReg(PCA9634_REG_MODE1, 0x80);
00010     // Set Mode 2: Don't invert logic, outputs change on ACK, LED outputs configured
00011     // in open-drain structure
00012     writeReg(PCA9634_REG_MODE2, 0x09);
00013     dimLEDs();
00014     // Set all LED driver output states to PWM
00015     led_out_state_[0] = PCA9634_ALL_LED_TO_PWM;
00016     led_out_state_[1] = PCA9634_ALL_LED_TO_PWM;
00017     
00018     commandLEDOutState();
00019 }
00020 
00021 void PCA9634::dimLEDs() {
00022     for (char reg = PCA_LED0; reg <= PCA_LED7; reg++)
00023         writeReg(reg, 0);
00024 }
00025 
00026 void PCA9634::disableLED(ledID led) {
00027     // Set correct registers to 00
00028     if (led < LED4) {
00029         led_out_state_[0] &= ~(1UL << (2*(led-2)));
00030         led_out_state_[0] &= ~(1UL << (2*(led-2)+1));
00031     } else {
00032         led_out_state_[1] &= ~(1UL << (2*(led-6)));
00033         led_out_state_[1] &= ~(1UL << (2*(led-6)+1));
00034     }
00035     commandLEDOutState();
00036 }
00037 
00038 void PCA9634::enableLED(ledID led) {
00039     // Set correct registers to 01
00040     if (led < LED4) {
00041         led_out_state_[0] |= (1UL << (2*(led-2)));
00042         led_out_state_[0] &= ~(1UL << (2*(led-2)+1));
00043     } else {
00044         led_out_state_[1] |= (1UL << (2*(led-6)));
00045         led_out_state_[1] &= ~(1UL << (2*(led-6)+1));
00046     }
00047     commandLEDOutState();
00048 }
00049 
00050 void PCA9634::commandLEDOutState() {
00051     writeReg(PCA9634_REG_LEDOUT0, led_out_state_[0]);
00052     writeReg(PCA9634_REG_LEDOUT1, led_out_state_[1]);   
00053 }
00054 
00055 void PCA9634::commandLEDBrightness(ledID led, int brightness) {
00056     writeReg(led, (char) brightness);
00057 }
00058 
00059 int PCA9634::writeReg(char reg, char value) {
00060     char cmd[2];
00061     cmd[0] = reg;
00062     cmd[1] = value;
00063     return i2c_->write(addr_, cmd, 2);
00064 }