CQ_I2C_book
16-channel Fm+ I2C-bus 57 mA/20 V constant current LED driver
Dependencies: mbed
Diff: PCA9955A.cpp
- Revision:
- 0:a872e4dd8ec3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9955A.cpp Wed Feb 04 06:09:08 2015 +0000
@@ -0,0 +1,180 @@
+#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;
+ }
+ }
+}
+