CQ_I2C_book / Mbed 2 deprecated PCAL9555A

Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up

Dependencies:   mbed

PCAL9555A.cpp@0:e714fc19ba54, 2015-02-04 (annotated)

Committer:
wataaki
Date:
Wed Feb 04 06:11:10 2015 +0000
Revision:
0:e714fc19ba54
Initial version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wataaki 0:e714fc19ba54 1 #include "mbed.h"
wataaki 0:e714fc19ba54 2 #include "PCAL9555A.h"
wataaki 0:e714fc19ba54 3
wataaki 0:e714fc19ba54 4 I2C i2c(p28,p27); // sda, scl
wataaki 0:e714fc19ba54 5 Serial pc(USBTX, USBRX); // tx, rx
wataaki 0:e714fc19ba54 6 char cmd[32];
wataaki 0:e714fc19ba54 7 char buf[4];
wataaki 0:e714fc19ba54 8 int i, j, k;
wataaki 0:e714fc19ba54 9 int sw;
wataaki 0:e714fc19ba54 10
wataaki 0:e714fc19ba54 11 void set_ch(char sel)
wataaki 0:e714fc19ba54 12 { // PCA9541のサンプル
wataaki 0:e714fc19ba54 13 // MST_0側の自分にスレーブ側の制御権を得る場合
wataaki 0:e714fc19ba54 14 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:e714fc19ba54 15 i2c.write( 0xe2, cmd, 1); // Cont Regを指定
wataaki 0:e714fc19ba54 16 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:e714fc19ba54 17 wait(0.1); // 0.1s待つ
wataaki 0:e714fc19ba54 18 switch(cmd[0] & 0xf)
wataaki 0:e714fc19ba54 19 {
wataaki 0:e714fc19ba54 20 case 0: // bus off, has control
wataaki 0:e714fc19ba54 21 case 1: // bus off, no control
wataaki 0:e714fc19ba54 22 case 5: // bus on, no control
wataaki 0:e714fc19ba54 23 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:e714fc19ba54 24 cmd[1] = 4; // bus on, has control
wataaki 0:e714fc19ba54 25 i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み
wataaki 0:e714fc19ba54 26 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:e714fc19ba54 27 break;
wataaki 0:e714fc19ba54 28 case 2: // bus off, no control
wataaki 0:e714fc19ba54 29 case 3: // bus off, has control
wataaki 0:e714fc19ba54 30 case 6: // bus on, no control
wataaki 0:e714fc19ba54 31 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:e714fc19ba54 32 cmd[1] = 5; // bus on, has control
wataaki 0:e714fc19ba54 33 i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み
wataaki 0:e714fc19ba54 34 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:e714fc19ba54 35 break;
wataaki 0:e714fc19ba54 36 case 9: // bus on, no control
wataaki 0:e714fc19ba54 37 case 0xc: // bus on, no control
wataaki 0:e714fc19ba54 38 case 0xd: // bus off, no control
wataaki 0:e714fc19ba54 39 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:e714fc19ba54 40 cmd[1] = 0; // bus on, has control
wataaki 0:e714fc19ba54 41 i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み
wataaki 0:e714fc19ba54 42 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:e714fc19ba54 43 break;
wataaki 0:e714fc19ba54 44 case 0xa: // bus on, no control
wataaki 0:e714fc19ba54 45 case 0xe: // bus off, no control
wataaki 0:e714fc19ba54 46 case 0xf: // bus on, has control
wataaki 0:e714fc19ba54 47 cmd[0] = 1; // PCA9541 コマンドコード Cont Reg
wataaki 0:e714fc19ba54 48 cmd[1] = 1; // bus on, has control
wataaki 0:e714fc19ba54 49 i2c.write( 0xe2, cmd, 2); // Cont Regにcmd[1]を書込み
wataaki 0:e714fc19ba54 50 i2c.read( 0xe2, cmd, 1); // Cont Regを読込み
wataaki 0:e714fc19ba54 51 break;
wataaki 0:e714fc19ba54 52 default:
wataaki 0:e714fc19ba54 53 break;
wataaki 0:e714fc19ba54 54 }
wataaki 0:e714fc19ba54 55
wataaki 0:e714fc19ba54 56 cmd[0] = sel; // PCA9546 Cont Reg sel channel enabled
wataaki 0:e714fc19ba54 57 i2c.write( 0xe8, cmd, 1); // Send command string
wataaki 0:e714fc19ba54 58 }
wataaki 0:e714fc19ba54 59
wataaki 0:e714fc19ba54 60 int main ()
wataaki 0:e714fc19ba54 61 {
wataaki 0:e714fc19ba54 62 i2c.frequency(100000);
wataaki 0:e714fc19ba54 63 pc.printf("PCAL9555A Sample Program\r\n");
wataaki 0:e714fc19ba54 64 set_ch(1); // PCAL9555Aはch0に接続
wataaki 0:e714fc19ba54 65
wataaki 0:e714fc19ba54 66 // PCAL9555A
wataaki 0:e714fc19ba54 67 while(1)
wataaki 0:e714fc19ba54 68 {
wataaki 0:e714fc19ba54 69 pc.printf("入力(PU) … 1, 出力 … 2, Interrupt_status … 3 ? \r\n");
wataaki 0:e714fc19ba54 70 pc.scanf("%d", &sw);
wataaki 0:e714fc19ba54 71 pc.printf("%d\r\n", sw);
wataaki 0:e714fc19ba54 72 switch (sw)
wataaki 0:e714fc19ba54 73 {
wataaki 0:e714fc19ba54 74 case 1:
wataaki 0:e714fc19ba54 75 pc.printf("入力(PU) Sample Start\r\n");
wataaki 0:e714fc19ba54 76
wataaki 0:e714fc19ba54 77 cmd[0] = PUPD_enable0;
wataaki 0:e714fc19ba54 78 cmd[1] = 0xff; // all P0 PUPD enable
wataaki 0:e714fc19ba54 79 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 80 cmd[0] = PUPD_selection0;
wataaki 0:e714fc19ba54 81 cmd[1] = 0xff; // all P0 PU
wataaki 0:e714fc19ba54 82 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 83 cmd[0] = PUPD_enable1;
wataaki 0:e714fc19ba54 84 cmd[1] = 0xff; // all P1 PUPD enable
wataaki 0:e714fc19ba54 85 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 86 cmd[0] = PUPD_selection1;
wataaki 0:e714fc19ba54 87 cmd[1] = 0xff; // all P1 PU
wataaki 0:e714fc19ba54 88 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 89
wataaki 0:e714fc19ba54 90 for(i=0; i<20; i++)
wataaki 0:e714fc19ba54 91 {
wataaki 0:e714fc19ba54 92 cmd[0] = Input_port0;
wataaki 0:e714fc19ba54 93 i2c.write(PCAL9555A_ADDR, cmd, 1);
wataaki 0:e714fc19ba54 94 i2c.read(PCAL9555A_ADDR, cmd, 1); // Input port0 Regを読込み
wataaki 0:e714fc19ba54 95 buf[0] = cmd[0];
wataaki 0:e714fc19ba54 96 cmd[0] = Input_port1;
wataaki 0:e714fc19ba54 97 i2c.write(PCAL9555A_ADDR, cmd, 1);
wataaki 0:e714fc19ba54 98 i2c.read(PCAL9555A_ADDR, cmd, 1); // Input port1 Regを読込み
wataaki 0:e714fc19ba54 99 pc.printf("Input P0=%02x P1=%02x\r\n", buf[0], cmd[0]); // Input port Regを表示
wataaki 0:e714fc19ba54 100 wait(0.5);
wataaki 0:e714fc19ba54 101 }
wataaki 0:e714fc19ba54 102 pc.printf("入力(PU) Sample End\r\n");
wataaki 0:e714fc19ba54 103 break;
wataaki 0:e714fc19ba54 104
wataaki 0:e714fc19ba54 105 case 2:
wataaki 0:e714fc19ba54 106 pc.printf("出力 Sample Start\r\n");
wataaki 0:e714fc19ba54 107
wataaki 0:e714fc19ba54 108 cmd[0] = Configuration0;
wataaki 0:e714fc19ba54 109 cmd[1] = 0x0; // all P1 output
wataaki 0:e714fc19ba54 110 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 111 cmd[0] = Configuration1;
wataaki 0:e714fc19ba54 112 cmd[1] = 0x0; // all P2 output
wataaki 0:e714fc19ba54 113 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 114 for(i=0; i<256; i++)
wataaki 0:e714fc19ba54 115 {
wataaki 0:e714fc19ba54 116 cmd[0] = Output_port0;
wataaki 0:e714fc19ba54 117 cmd[1] = i; // P1 = i
wataaki 0:e714fc19ba54 118 buf[0] = cmd[1]; // data buffer
wataaki 0:e714fc19ba54 119 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 120 cmd[0] = Output_port1;
wataaki 0:e714fc19ba54 121 cmd[1] = i; // P2 = 255-i
wataaki 0:e714fc19ba54 122 cmd[1] = 255-i; // P2 = 255-i
wataaki 0:e714fc19ba54 123 buf[1] = cmd[1]; // data buffer
wataaki 0:e714fc19ba54 124 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 125
wataaki 0:e714fc19ba54 126 cmd[0] = Input_port0;
wataaki 0:e714fc19ba54 127 i2c.write(PCAL9555A_ADDR, cmd, 1, true);
wataaki 0:e714fc19ba54 128 i2c.read(PCAL9555A_ADDR, cmd, 1); // Input port1 Regを読込み
wataaki 0:e714fc19ba54 129 buf[2] = cmd[0]; // data buffer
wataaki 0:e714fc19ba54 130 cmd[0] = Input_port1;
wataaki 0:e714fc19ba54 131 i2c.write(PCAL9555A_ADDR, cmd, 1, true);
wataaki 0:e714fc19ba54 132 i2c.read(PCAL9555A_ADDR, cmd, 1); // Input port1 Regを読込み
wataaki 0:e714fc19ba54 133 buf[3] = cmd[0]; // data buffer
wataaki 0:e714fc19ba54 134
wataaki 0:e714fc19ba54 135 pc.printf("Output P0=%02x P1=%02x Input P0=%02x P1=%02x\r\n", buf[0], buf[1], buf[2], buf[3]);
wataaki 0:e714fc19ba54 136 wait(0.1);
wataaki 0:e714fc19ba54 137 }
wataaki 0:e714fc19ba54 138 pc.printf("出力 Sample End\r\n");
wataaki 0:e714fc19ba54 139
wataaki 0:e714fc19ba54 140 cmd[0] = Configuration0;
wataaki 0:e714fc19ba54 141 cmd[1] = 0xff; // all input
wataaki 0:e714fc19ba54 142 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 143 break;
wataaki 0:e714fc19ba54 144
wataaki 0:e714fc19ba54 145 case 3:
wataaki 0:e714fc19ba54 146 pc.printf("Interrupt_status Sample Start\r\n");
wataaki 0:e714fc19ba54 147
wataaki 0:e714fc19ba54 148 cmd[0] = Configuration0;
wataaki 0:e714fc19ba54 149 cmd[1] = 0xff; // all P0 input
wataaki 0:e714fc19ba54 150 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 151
wataaki 0:e714fc19ba54 152 cmd[0] = Configuration1;
wataaki 0:e714fc19ba54 153 cmd[1] = 0xff; // all P1 input
wataaki 0:e714fc19ba54 154 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 155
wataaki 0:e714fc19ba54 156 cmd[0] = Interrupt_mask0;
wataaki 0:e714fc19ba54 157 cmd[1] = 0x00; // all P0 割込み可
wataaki 0:e714fc19ba54 158 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 159
wataaki 0:e714fc19ba54 160 cmd[0] = Interrupt_mask1;
wataaki 0:e714fc19ba54 161 cmd[1] = 0x00; // all P1 割込み可
wataaki 0:e714fc19ba54 162 i2c.write(PCAL9555A_ADDR, cmd, 2);
wataaki 0:e714fc19ba54 163
wataaki 0:e714fc19ba54 164 cmd[0] = Input_port0;
wataaki 0:e714fc19ba54 165 i2c.write(PCAL9555A_ADDR, cmd, 1, true);
wataaki 0:e714fc19ba54 166 i2c.read(PCAL9555A_ADDR, cmd, 1); // Input_port0からオリジナル値の取得
wataaki 0:e714fc19ba54 167
wataaki 0:e714fc19ba54 168 cmd[0] = Input_port1;
wataaki 0:e714fc19ba54 169 i2c.write(PCAL9555A_ADDR, cmd, 1, true);
wataaki 0:e714fc19ba54 170 i2c.read(PCAL9555A_ADDR, cmd, 1); // Input_port1からオリジナル値の取得
wataaki 0:e714fc19ba54 171
wataaki 0:e714fc19ba54 172 for(i=0; i<100; i++)
wataaki 0:e714fc19ba54 173 {
wataaki 0:e714fc19ba54 174 cmd[0] = Interrupt_status0;
wataaki 0:e714fc19ba54 175 i2c.write(PCAL9555A_ADDR, cmd, 1, true);
wataaki 0:e714fc19ba54 176 i2c.read(PCAL9555A_ADDR, cmd, 1); // Interrupt_status0 Regを読込み
wataaki 0:e714fc19ba54 177 buf[0] = cmd[0]; // data buffer
wataaki 0:e714fc19ba54 178
wataaki 0:e714fc19ba54 179 cmd[0] = Interrupt_status1;
wataaki 0:e714fc19ba54 180 i2c.write(PCAL9555A_ADDR, cmd, 1, true);
wataaki 0:e714fc19ba54 181 i2c.read(PCAL9555A_ADDR, cmd, 1); // Interrupt_status1 Regを読込み
wataaki 0:e714fc19ba54 182 pc.printf("Interrupt_status P0=%02x P1=%02x\r\n", buf[0], cmd[0]); // 割込状況を表示
wataaki 0:e714fc19ba54 183 wait(0.2);
wataaki 0:e714fc19ba54 184 }
wataaki 0:e714fc19ba54 185 pc.printf("Interrupt_status Sample End\r\n");
wataaki 0:e714fc19ba54 186 break;
wataaki 0:e714fc19ba54 187 default:
wataaki 0:e714fc19ba54 188 break;
wataaki 0:e714fc19ba54 189 }
wataaki 0:e714fc19ba54 190 }
wataaki 0:e714fc19ba54 191 }