CQ_I2C_book / Mbed 2 deprecated PCA9956A

24-channel Fm+ I2C-bus 57 mA/20 V constant current LED driver

Dependencies:   mbed

PCA9956A.cpp@0:2ae25badaf6a, 2015-02-04 (annotated)

Committer:
wataaki
Date:
Wed Feb 04 06:09:44 2015 +0000
Revision:
0:2ae25badaf6a
Initial version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wataaki 0:2ae25badaf6a 1 #include "mbed.h"
wataaki 0:2ae25badaf6a 2 #include "PCA9956A.h"
wataaki 0:2ae25badaf6a 3
wataaki 0:2ae25badaf6a 4 I2C i2c(p28,p27); // sda, scl
wataaki 0:2ae25badaf6a 5 Serial pc(USBTX, USBRX); // tx, rx
wataaki 0:2ae25badaf6a 6 char cmd[32];
wataaki 0:2ae25badaf6a 7 int i, j;
wataaki 0:2ae25badaf6a 8
wataaki 0:2ae25badaf6a 9 void set_ch(char sel)
wataaki 0:2ae25badaf6a 10 { // PCA9541のサンプル
wataaki 0:2ae25badaf6a 11 // MST_0側の自分にスレーブ側の制御権を得る場合
wataaki 0:2ae25badaf6a 12 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:2ae25badaf6a 13 i2c.write( 0xe2, cmd, 1); // Cont Regを指定
wataaki 0:2ae25badaf6a 14 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:2ae25badaf6a 15 wait(0.1); // 0.1s待つ
wataaki 0:2ae25badaf6a 16 switch(cmd[0] & 0xf)
wataaki 0:2ae25badaf6a 17 {
wataaki 0:2ae25badaf6a 18 case 0: // bus off, has control
wataaki 0:2ae25badaf6a 19 case 1: // bus off, no control
wataaki 0:2ae25badaf6a 20 case 5: // bus on, no control
wataaki 0:2ae25badaf6a 21 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:2ae25badaf6a 22 cmd[1] = 4; // bus on, has control
wataaki 0:2ae25badaf6a 23 i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み
wataaki 0:2ae25badaf6a 24 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:2ae25badaf6a 25 break;
wataaki 0:2ae25badaf6a 26 case 2: // bus off, no control
wataaki 0:2ae25badaf6a 27 case 3: // bus off, has control
wataaki 0:2ae25badaf6a 28 case 6: // bus on, no control
wataaki 0:2ae25badaf6a 29 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:2ae25badaf6a 30 cmd[1] = 5; // bus on, has control
wataaki 0:2ae25badaf6a 31 i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み
wataaki 0:2ae25badaf6a 32 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:2ae25badaf6a 33 break;
wataaki 0:2ae25badaf6a 34 case 9: // bus on, no control
wataaki 0:2ae25badaf6a 35 case 0xc: // bus on, no control
wataaki 0:2ae25badaf6a 36 case 0xd: // bus off, no control
wataaki 0:2ae25badaf6a 37 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:2ae25badaf6a 38 cmd[1] = 0; // bus on, has control
wataaki 0:2ae25badaf6a 39 i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み
wataaki 0:2ae25badaf6a 40 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:2ae25badaf6a 41 break;
wataaki 0:2ae25badaf6a 42 case 0xa: // bus on, no control
wataaki 0:2ae25badaf6a 43 case 0xe: // bus off, no control
wataaki 0:2ae25badaf6a 44 case 0xf: // bus on, has control
wataaki 0:2ae25badaf6a 45 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:2ae25badaf6a 46 cmd[1] = 1; // bus on, has control
wataaki 0:2ae25badaf6a 47 i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み
wataaki 0:2ae25badaf6a 48 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:2ae25badaf6a 49 break;
wataaki 0:2ae25badaf6a 50 default:
wataaki 0:2ae25badaf6a 51 break;
wataaki 0:2ae25badaf6a 52 }
wataaki 0:2ae25badaf6a 53
wataaki 0:2ae25badaf6a 54 cmd[0] = sel; // PCA9546 Cont Reg sel channel enabled
wataaki 0:2ae25badaf6a 55 i2c.write( 0xe8, cmd, 1); // Send command string
wataaki 0:2ae25badaf6a 56 }
wataaki 0:2ae25badaf6a 57
wataaki 0:2ae25badaf6a 58 int main ()
wataaki 0:2ae25badaf6a 59 {
wataaki 0:2ae25badaf6a 60 i2c.frequency(100000);
wataaki 0:2ae25badaf6a 61 pc.printf("PCA9956A Sample Program\r\n");
wataaki 0:2ae25badaf6a 62
wataaki 0:2ae25badaf6a 63 set_ch(2); // PCA9956Aはch1に接続
wataaki 0:2ae25badaf6a 64
wataaki 0:2ae25badaf6a 65 // PCA9956A
wataaki 0:2ae25badaf6a 66 cmd[0] = MODE1;
wataaki 0:2ae25badaf6a 67 cmd[1] = 0x0; // SLEEP = 0
wataaki 0:2ae25badaf6a 68 i2c.write(PCA9956A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み
wataaki 0:2ae25badaf6a 69
wataaki 0:2ae25badaf6a 70 cmd[0] = LEDOUT0 + 0x80; // LEDOUT0, Auto incriment
wataaki 0:2ae25badaf6a 71 cmd[1] = 0xaa; // LED3,2,1,0 10= PWM
wataaki 0:2ae25badaf6a 72 cmd[2] = 0xaa; // LED7,6,5,4 10= PWM
wataaki 0:2ae25badaf6a 73 cmd[3] = 0xaa; // LED11,10,9,8 10= PWM
wataaki 0:2ae25badaf6a 74 cmd[4] = 0xaa; // LED15,14,13,12 10= PWM
wataaki 0:2ae25badaf6a 75 cmd[5] = 0xaa; // LED19,18,17,16 10= PWM
wataaki 0:2ae25badaf6a 76 cmd[6] = 0xaa; // LED23,22,21,20 10= PWM
wataaki 0:2ae25badaf6a 77 i2c.write(PCA9956A_ADDR, cmd, 7); // cmd[0]Regにcmd[1-6]を書込み
wataaki 0:2ae25badaf6a 78
wataaki 0:2ae25badaf6a 79 cmd[0] = IREFALL;
wataaki 0:2ae25badaf6a 80 cmd[1] = 0x80; // Idrv = 40uA * 128 = 5.12mA
wataaki 0:2ae25badaf6a 81 i2c.write(PCA9956A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み
wataaki 0:2ae25badaf6a 82
wataaki 0:2ae25badaf6a 83 while(1)
wataaki 0:2ae25badaf6a 84 {
wataaki 0:2ae25badaf6a 85 if (i>23) i = 0;
wataaki 0:2ae25badaf6a 86 cmd[0] = PWMALL;
wataaki 0:2ae25badaf6a 87 cmd[1] = 0x0; // PWM = 0%
wataaki 0:2ae25badaf6a 88 i2c.write(PCA9956A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み
wataaki 0:2ae25badaf6a 89
wataaki 0:2ae25badaf6a 90 cmd[0] = PWM0 + i; // PWMx = PWM0 + i
wataaki 0:2ae25badaf6a 91 cmd[1] = 0xf0; // PWM = 99.6%
wataaki 0:2ae25badaf6a 92 i2c.write(PCA9956A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み
wataaki 0:2ae25badaf6a 93 wait(0.5);
wataaki 0:2ae25badaf6a 94 i++;
wataaki 0:2ae25badaf6a 95 }
wataaki 0:2ae25badaf6a 96 }
wataaki 0:2ae25badaf6a 97