![](/media/cache/group/i2c_logo.png.50x50_q85.png)
Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up
Dependencies: mbed
PCAL9555A.cpp
- Committer:
- wataaki
- Date:
- 2015-02-04
- Revision:
- 0:e714fc19ba54
File content as of revision 0:e714fc19ba54:
#include "mbed.h" #include "PCAL9555A.h" I2C i2c(p28,p27); // sda, scl Serial pc(USBTX, USBRX); // tx, rx char cmd[32]; char buf[4]; 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("PCAL9555A Sample Program\r\n"); set_ch(1); // PCAL9555Aはch0に接続 // PCAL9555A while(1) { pc.printf("入力(PU) … 1, 出力 … 2, Interrupt_status … 3 ? \r\n"); pc.scanf("%d", &sw); pc.printf("%d\r\n", sw); switch (sw) { case 1: pc.printf("入力(PU) Sample Start\r\n"); cmd[0] = PUPD_enable0; cmd[1] = 0xff; // all P0 PUPD enable i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = PUPD_selection0; cmd[1] = 0xff; // all P0 PU i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = PUPD_enable1; cmd[1] = 0xff; // all P1 PUPD enable i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = PUPD_selection1; cmd[1] = 0xff; // all P1 PU i2c.write(PCAL9555A_ADDR, cmd, 2); for(i=0; i<20; i++) { cmd[0] = Input_port0; i2c.write(PCAL9555A_ADDR, cmd, 1); i2c.read(PCAL9555A_ADDR, cmd, 1); // Input port0 Regを読込み buf[0] = cmd[0]; cmd[0] = Input_port1; i2c.write(PCAL9555A_ADDR, cmd, 1); i2c.read(PCAL9555A_ADDR, cmd, 1); // Input port1 Regを読込み pc.printf("Input P0=%02x P1=%02x\r\n", buf[0], cmd[0]); // Input port Regを表示 wait(0.5); } pc.printf("入力(PU) Sample End\r\n"); break; case 2: pc.printf("出力 Sample Start\r\n"); cmd[0] = Configuration0; cmd[1] = 0x0; // all P1 output i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = Configuration1; cmd[1] = 0x0; // all P2 output i2c.write(PCAL9555A_ADDR, cmd, 2); for(i=0; i<256; i++) { cmd[0] = Output_port0; cmd[1] = i; // P1 = i buf[0] = cmd[1]; // data buffer i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = Output_port1; cmd[1] = i; // P2 = 255-i cmd[1] = 255-i; // P2 = 255-i buf[1] = cmd[1]; // data buffer i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = Input_port0; i2c.write(PCAL9555A_ADDR, cmd, 1, true); i2c.read(PCAL9555A_ADDR, cmd, 1); // Input port1 Regを読込み buf[2] = cmd[0]; // data buffer cmd[0] = Input_port1; i2c.write(PCAL9555A_ADDR, cmd, 1, true); i2c.read(PCAL9555A_ADDR, cmd, 1); // Input port1 Regを読込み buf[3] = cmd[0]; // data buffer pc.printf("Output P0=%02x P1=%02x Input P0=%02x P1=%02x\r\n", buf[0], buf[1], buf[2], buf[3]); wait(0.1); } pc.printf("出力 Sample End\r\n"); cmd[0] = Configuration0; cmd[1] = 0xff; // all input i2c.write(PCAL9555A_ADDR, cmd, 2); break; case 3: pc.printf("Interrupt_status Sample Start\r\n"); cmd[0] = Configuration0; cmd[1] = 0xff; // all P0 input i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = Configuration1; cmd[1] = 0xff; // all P1 input i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = Interrupt_mask0; cmd[1] = 0x00; // all P0 割込み可 i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = Interrupt_mask1; cmd[1] = 0x00; // all P1 割込み可 i2c.write(PCAL9555A_ADDR, cmd, 2); cmd[0] = Input_port0; i2c.write(PCAL9555A_ADDR, cmd, 1, true); i2c.read(PCAL9555A_ADDR, cmd, 1); // Input_port0からオリジナル値の取得 cmd[0] = Input_port1; i2c.write(PCAL9555A_ADDR, cmd, 1, true); i2c.read(PCAL9555A_ADDR, cmd, 1); // Input_port1からオリジナル値の取得 for(i=0; i<100; i++) { cmd[0] = Interrupt_status0; i2c.write(PCAL9555A_ADDR, cmd, 1, true); i2c.read(PCAL9555A_ADDR, cmd, 1); // Interrupt_status0 Regを読込み buf[0] = cmd[0]; // data buffer cmd[0] = Interrupt_status1; i2c.write(PCAL9555A_ADDR, cmd, 1, true); i2c.read(PCAL9555A_ADDR, cmd, 1); // Interrupt_status1 Regを読込み pc.printf("Interrupt_status P0=%02x P1=%02x\r\n", buf[0], cmd[0]); // 割込状況を表示 wait(0.2); } pc.printf("Interrupt_status Sample End\r\n"); break; default: break; } } }