CQ_I2C_book
Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up
Dependencies: mbed
Diff: PCAL9555A.cpp
- Revision:
- 0:e714fc19ba54
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PCAL9555A.cpp Wed Feb 04 06:11:10 2015 +0000
@@ -0,0 +1,191 @@
+#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;
+ }
+ }
+}
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