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16-channel Fm+ I2C-bus 57 mA/20 V constant current LED driver
Dependencies: mbed
PCA9955A.cpp
- Committer:
- wataaki
- Date:
- 2015-02-04
- Revision:
- 0:a872e4dd8ec3
File content as of revision 0:a872e4dd8ec3:
#include "mbed.h" #include "PCA9955A.h" I2C i2c(p28,p27); // sda, scl Serial pc(USBTX, USBRX); // tx, rx char cmd[32]; int i, j, k; int sw; void set_ch(char sel) { // PCA9541のサンプル // MST_0側の自分にスレーブ側の制御権を得る場合 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg i2c.write( 0xe2, cmd, 1); // Cont Regを指定 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み wait(0.1); // 0.1s待つ switch(cmd[0] & 0xf) { case 0: // bus off, has control case 1: // bus off, no control case 5: // bus on, no control cmd[0] = 1; // PCA9541 コマンドコード Cont Reg cmd[1] = 4; // bus on, has control i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み i2c.read( 0xe2, cmd, 1); // Cont Regを読込み break; case 2: // bus off, no control case 3: // bus off, has control case 6: // bus on, no control cmd[0] = 1; // PCA9541 コマンドコード Cont Reg cmd[1] = 5; // bus on, has control i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み i2c.read( 0xe2, cmd, 1); // Cont Regを読込み break; case 9: // bus on, no control case 0xc: // bus on, no control case 0xd: // bus off, no control cmd[0] = 1; // PCA9541 コマンドコード Cont Reg cmd[1] = 0; // bus on, has control i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み i2c.read( 0xe2, cmd, 1); // Cont Regを読込み break; case 0xa: // bus on, no control case 0xe: // bus off, no control case 0xf: // bus on, has control cmd[0] = 1; // PCA9541 コマンドコード Cont Reg cmd[1] = 1; // bus on, has control i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み i2c.read( 0xe2, cmd, 1); // Cont Regを読込み break; default: break; } cmd[0] = sel; // PCA9546 Cont Reg sel channel enabled i2c.write( 0xe8, cmd, 1); // Send command string } int main () { i2c.frequency(100000); pc.printf("PCA9955A Sample Program\r\n"); set_ch(1); // PCA9955Aはch0に接続 // PCA9955A while(1) { pc.printf("シーケンシャル … 1, グラデーション … 2 ? \r\n"); pc.scanf("%d", &sw); pc.printf("%d\r\n", sw); switch (sw) { case 1: pc.printf("シーケンシャル Sample Start\r\n"); cmd[0] = MODE1; cmd[1] = 0x0; // SLEEP = 0 i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = LEDOUT0 + 0x80; // LEDOUT0, Auto incriment cmd[1] = 0xaa; // LED3,2,1,0 10= PWM cmd[2] = 0xaa; // LED7,6,5,4 10= PWM cmd[3] = 0xaa; // LED11,10,9,8 10= PWM cmd[4] = 0xaa; // LED15,14,13,12 10= PWM i2c.write(PCA9955A_ADDR, cmd, 5); // cmd[0]Regにcmd[1-4]を書込み cmd[0] = IREF0 + 0x80; // IREF0, Auto incriment for(i=0; i<16; i++) cmd[i+1] = 0x80; // all IREF = 50% i2c.write(PCA9955A_ADDR, cmd, 17); // cmd[0]Regにcmd[1-16]を書込み for(k=0; k<3; k++) // 3回繰返す { for(i=0; i<16; i++) // チャネル0~15まで一つずつ点灯 { cmd[0] = PWM0 + 0x80; // PWM0, Auto incriment for(j=0; j<16; j++) cmd[j+1] = 0x0; // all LED PWM = 0% cmd[i+1] = 0xff; // iチャネルのLED PWM = 99.6% i2c.write(PCA9955A_ADDR, cmd, 17); // cmd[0]Regにcmd[1-16]を書込み wait(0.5); } } pc.printf("シーケンシャル Sample End\r\n"); break; case 2: pc.printf("グラデーション Sample Start\r\n"); cmd[0] = MODE1; cmd[1] = 0x0; // SLEEP = 0 i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = LEDOUT0 + 0x80; // LEDOUT0, Auto incriment cmd[1] = 0x55; // LED3,2,1,0 01= ON cmd[2] = 0x05; // LED7,6 00= OFF LED5,4 01= ON cmd[3] = 0x00; // LED11,10,9,8 00= OFF cmd[4] = 0x00; // LED15,14,13,12 00= OFF i2c.write(PCA9955A_ADDR, cmd, 5); // cmd[0]Regにcmd[1-4]を書込み /* cmd[0] = PWMALL; cmd[1] = 0xFF; // PWM = 99.6% i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み */ cmd[0] = GRAD_GRP_SEL1; cmd[1] = 0x50; // LED3, 4 = GRP0 i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = IREFALL; // cmd[1] = 0x1; // あとでIREF_GRP0で設定するので1以上であればよい i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み /* cmd[0] = IREF4; // cmd[1] = 0x1; // Idrv = 240 * 40uA(Rext = 5.6k)=9.6mA i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み */ cmd[0] = GRAD_MODE_SEL0; cmd[1] = 0x31; // LED0, 4, 5 = Gradation i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = GRAD_GRP_SEL0; cmd[1] = 0x0; // LED0, 1, 2, 3 = GRP0 i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = IREF_GRP0; cmd[1] = 0xF0; // Idrv = 240 * 40uA(Rext = 5.6k)=9.6mA i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = STEP_TIME_GRP0; cmd[1] = 0x3F; // 0.5ms * 64 = 32ms i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = RAMP_RATE_GRP0; cmd[1] = 0xc0 + 0x31; // Ramp up/down ON, Ramp rate = 50 i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = HOLD_CNTL_GRP0; cmd[1] = 0xc0 + (0x1 << 3) + 0x2; // Hold ON/OFF ON, ON = 0.25s, OFF = 0.5s i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = GRAD_CNTL; cmd[1] = 0x3; // Gradation ON, Continuous i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み wait(15); // 15s 待つ cmd[0] = GRAD_CNTL; cmd[1] = 0x0; // Gradation OFF i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み cmd[0] = GRAD_MODE_SEL0; cmd[1] = 0x0; // LED0, 4, 5 = Normal i2c.write(PCA9955A_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み pc.printf("グラデーション Sample End\r\n"); break; default: break; } } }