CQ_I2C_book
8-bit A/D and D/A converter
Dependencies: mbed
Revision 0:74b27674f0d8, committed 2015-02-04
- Comitter:
- wataaki
- Date:
- Wed Feb 04 06:12:52 2015 +0000
- Commit message:
- Initial version
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF8591.cpp Wed Feb 04 06:12:52 2015 +0000
@@ -0,0 +1,83 @@
+#include "mbed.h"
+#include "PCF8591.h"
+
+I2C i2c(p28,p27); // sda, scl
+Serial pc(USBTX, USBRX); // tx, rx
+char cmd[32];
+char i;
+
+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("PCF8591T Sample Program\r\n");
+
+ set_ch(2); // PCF8591Tはch1に接続
+
+ // PCF8591T
+
+ cmd[0] = 0x44;
+ cmd[1] = 0x80; // SLEEP = 0
+ i2c.write(PCF8591_ADDR, cmd, 2); // cmd[0]Regにcmd[1]を書込み
+ pc.printf("AOUT=%2x AIN0=%2x AIN1=%2x AIN2=%2x AIN3=%2x\r\n", i++, cmd[1], cmd[2], cmd[3], cmd[4]); // Cont Regを表示
+
+ while(1)
+ {
+ cmd[0] = 0x44 + 0x0; // DAC有効、オートインクリメント
+ cmd[1] = i; // DAC値設定 0～0xFF
+ i2c.write(PCF8591_ADDR, cmd, 2); // DAC値更新
+
+ i2c.read(PCF8591_ADDR, cmd, 5); // AD変換値を5バイト分取得
+ // AD変換値はCH0の前回データ、CH0～CH3の変換データ
+ pc.printf("AOUT=%2x PREV=%2x AIN0=%2x AIN1=%2x AIN2=%2x AIN3=%2x\r\n", i++, cmd[0], cmd[1], cmd[2], cmd[3], cmd[4]); // AD変換値を表示
+ wait(1.0);
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/PCF8591.h Wed Feb 04 06:12:52 2015 +0000 @@ -0,0 +1,37 @@ +#define PCF8591_ADDR 0x90 +//#define PCF8591_ADDR 0x92 +//#define PCF8591_ADDR 0x94 +//#define PCF8591_ADDR 0x96 +//#define PCF8591_ADDR 0x98 +//#define PCF8591_ADDR 0x9A +//#define PCF8591_ADDR 0x9C +//#define PCF8591_ADDR 0x9E + +#define MODE1 0x00 +#define MODE2 0x01 +#define PWM0 0x02 +#define PWM1 0x03 +#define PWM2 0x04 +#define PWM3 0x05 +#define PWM4 0x06 +#define PWM5 0x07 +#define PWM6 0x08 +#define PWM7 0x09 +#define PWM8 0x0a +#define PWM9 0x0b +#define PWM10 0x0c +#define PWM11 0x0d +#define PWM12 0x0e +#define PWM13 0x0f +#define PWM14 0x10 +#define PWM15 0x11 +#define GRPPWM 0x12 +#define GRPFREQ 0x13 +#define LEDOUT0 0x14 +#define LEDOUT1 0x15 +#define LEDOUT2 0x16 +#define LEDOUT3 0x17 +#define SUBADR1 0x18 +#define SUBADR2 0x19 +#define SUBADR3 0x1a +#define ALLCALLADR 0x1b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Feb 04 06:12:52 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/552587b429a1 \ No newline at end of file