CQ_I2C_book
Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support
Dependencies: mbed
Revision 0:e35a417c6590, committed 2015-02-04
- Comitter:
- wataaki
- Date:
- Wed Feb 04 06:14:43 2015 +0000
- Commit message:
- Initial version
Changed in this revision
diff -r 000000000000 -r e35a417c6590 SC16IS750.cpp
--- /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);
+ }
+}
\ No newline at end of file
diff -r 000000000000 -r e35a417c6590 SC16IS750.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SC16IS750.h Wed Feb 04 06:14:43 2015 +0000 @@ -0,0 +1,29 @@ +// SC16IS750 I2C-UART +#define SC16IS750_ADDR 0x98 + +#define RHR 0x00 +#define THR 0x00 +#define IER 0x01 +#define IIR 0x02 +#define FCR 0x02 +#define LCR 0x03 +#define MCR 0x04 +#define LSR 0x05 +#define MSR 0x06 +#define SPR 0x07 +#define TCR 0x06 +#define TLR 0x07 +#define TXLVL 0x08 +#define RXLVL 0x09 +#define IODir 0x0a +#define IOState 0x0b +#define IOIntEna 0x0c +#define IOControl 0x0e +#define EFCR 0x0f +#define DLL 0x00 +#define DLH 0x01 +#define EFR 0x02 +#define XON1 0x04 +#define XON2 0x05 +#define XOFF1 0x06 +#define XOFF2 0x07
diff -r 000000000000 -r e35a417c6590 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Feb 04 06:14:43 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5 \ No newline at end of file