Import fx2lib into fx2lafw directly.

[sigrok-firmware-fx2lafw.git] / fx2lib / examples / i2c / i2c.c

diff --git a/fx2lib/examples/i2c/i2c.c b/fx2lib/examples/i2c/i2c.c
new file mode 100644 (file)
index 0000000..7af95bb
--- /dev/null
+++ b/fx2lib/examples/i2c/i2c.c
@@ -0,0 +1,92 @@
+/**
+ * Copyright (C) 2009 Ubixum, Inc. 
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ **/
+
+
+
+#include <fx2regs.h>
+
+#include <i2c.h>
+
+#define LED_ADDR 0x21
+#define BTN_ADDR 0x20
+
+#define KEY_F1 0
+#define KEY_F2 1
+#define KEY_F3 2
+#define KEY_F4 3
+
+
+BYTE digits[] = { 0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x98, 0x88, 0x83, 0xc6, 0xa1, 0x86, 0x8e  };
+
+
+/**
+ * This is pretty much the same function that is provided as the dev_io example from Cypress
+ * Except is uses i2c read and write functions not from their library
+ **/
+void main(void) {
+
+    BYTE    num = 0;
+    //BYTE xdata       buttons;
+    BYTE    buttons;
+       BYTE    kstates = 0xff;
+       BYTE    kdeltas;
+       BYTE    key;
+       BYTE    display = 1;
+
+       while(1)
+       {
+               i2c_read ( BTN_ADDR, 1, &buttons );
+
+               kdeltas = kstates ^ buttons;                    // 
+               kstates = buttons;
+               key = 0;
+
+               while(kdeltas)
+               {
+                       if(kdeltas & 0x01)
+                       {
+                               if(!((kstates >> key) & 0x01))
+                                       switch(key)
+                                       {
+                        case KEY_F1: // wakeup?
+                                                       num = 0;
+                                                       break;
+                                               case KEY_F2:
+                                                       if(--num > 0x0f)
+                                                               num = 0x0f;
+                                                       break;
+                                               case KEY_F3:
+                                                       if(++num > 0x0f)
+                                                               num = 0;
+                                                       break;                                          
+                                               case KEY_F4:
+                                                       num = 0x0f;
+                                       }
+                               display = 1;
+                       }
+                       kdeltas = kdeltas >> 1;
+                       ++key;
+               }
+               if(display)
+               {
+            i2c_write ( LED_ADDR, 1, &digits[num], 0, NULL );
+                       display = 0;
+               }
+    }
+
+}