Diff: SC16IS750.cpp

Revision:

0:e35a417c6590

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SC16IS750.cpp	Wed Feb 04 06:14:43 2015 +0000
@@ -0,0 +1,105 @@
+#include "mbed.h"
+#include "SC16IS750.h"
+ 
+I2C i2c(p28,p27);        // sda, scl
+Serial pc(USBTX, USBRX); // tx, rx
+char cmd[128];
+char str[128];
+char i, j;
+ 
+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("\r\nSC16IS750 Sample Program\r\n");
+     
+    set_ch(1);              // SC16IS750はch0に接続
+  // 
+
+    cmd[0] = LCR << 3;
+    cmd[1] = 0x83;          // DLL,H Latch enable
+    i2c.write(SC16IS750_ADDR, cmd, 2);
+
+    cmd[0] = DLL << 3;
+    cmd[1] = 117;           // baud = 18e6 / 16 /117 = 9615 
+    i2c.write(SC16IS750_ADDR, cmd, 2);
+
+    cmd[0] = DLH << 3;
+    cmd[1] = 0x0;
+    i2c.write(SC16IS750_ADDR, cmd, 2);
+
+    cmd[0] = LCR << 3;
+    cmd[1] = 0x03;        // NoParity 1Stop 8bits
+    i2c.write(SC16IS750_ADDR, cmd, 2);
+
+    cmd[0] = FCR << 3;
+    cmd[1] = 0x07;        // reset TX,RX FIFO, FIFO enable
+    i2c.write(SC16IS750_ADDR, cmd, 2);
+
+    while(1)
+    {
+        pc.printf("\r\n文字列を入力してください>");
+        pc.scanf("%s" , str);
+        j = strlen(str);
+        pc.printf("\r\n送信された文字列 = %s %d文字\r\n" , str, j);
+        cmd[0] = THR << 3;
+        for (i = 0; i < j; i++) cmd[i + 1] = str[i];
+        i2c.write(SC16IS750_ADDR, cmd, j + 1);
+
+        wait(1);
+
+        cmd[0] = RHR << 3;          //
+        i2c.write(SC16IS750_ADDR, cmd, 1, true);
+        i2c.read(SC16IS750_ADDR, cmd, j);
+        cmd[j] = 0;
+        pc.printf("受信した文字列 = %s\r\n", cmd);
+    }
+}
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