Diff: KuAQM0802A.cpp

Revision:

0:414db8b8aaad

Child:

1:39cf7f91a7ba

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/KuAQM0802A.cpp	Sun Jul 20 14:28:45 2014 +0000
@@ -0,0 +1,95 @@
+#include "KuAQM0802A.h"
+
+const int KU_AQM0802A_I2C_ADDR = 0x3E << 1; // 0x7C
+const int KU_AQM0802A_INITIAL_CONTRAST = 35;
+
+KuAQM0802A::KuAQM0802A(I2C &i2c_) : i2c(i2c_)
+{
+    reset();
+}
+
+KuAQM0802A::~KuAQM0802A()
+{
+}
+
+/**
+ * Reset AQM0802A LCD
+ */
+void KuAQM0802A::reset() {
+    // wait 40 msec
+    wait(0.04);
+    // Function set (to Normal Mode)
+    send_cmd(0x38);
+    // Function set (to Extention Mode)
+    send_cmd(0x39);
+    // EntryMode (Left to Right, No Shift)
+    send_cmd(0x04);
+    // Interval OSC frequency
+    send_cmd(0x14);
+    // Contrast (Low bits)
+    send_cmd(0x70 | (KU_AQM0802A_INITIAL_CONTRAST & 0xF));
+    // Icon on (0x08) / Booster circuit on (0x04) / Contrast (High bits)
+    send_cmd(0x50 | 0x08 | 0x04 | ((KU_AQM0802A_INITIAL_CONTRAST >> 4) & 0x3));
+    // Follower control
+    send_cmd(0x6C);
+    wait(0.2);
+    // Function set (to Normal Mode)
+    send_cmd(0x38);
+    // Display On
+    send_cmd(0x0C);
+    // Clear Display
+    send_cmd(0x01);
+    wait(0.2);
+}
+
+/**
+ * Locate cursor
+ */
+void KuAQM0802A::locate(unsigned int x, unsigned int y) {
+  send_cmd(0x80 | (y * 0x40 + x));
+}
+
+/**
+ * Print a string
+ */
+void KuAQM0802A::print(const char *str) {
+    while(*str) {
+        bool last;
+        if(*(str + 1)) {
+            last = false;
+        } else {
+            last = true;
+        }
+        send(!last, true, *str);
+        str++;
+    }
+}
+
+/**
+ * Change LCD contrast (0-63)
+ */
+void KuAQM0802A::set_contrast(unsigned int c) {
+  send_cmd(0x39);
+  send_cmd(0x70 | (c & 0xF));                      // Contrast Set (Low bits)
+  send_cmd(0x50 | 0x08 | 0x40 | ((c >> 4) & 0x3)); // Icon on / Booster circuit on / Contrast Set (High bits)
+  send_cmd(0x38);
+}
+
+/**
+ * Send an AQM0802A command
+ */
+void KuAQM0802A::send_cmd(char cmd) {
+    send(false, false, cmd);
+}
+
+/**
+ * Send raw code.
+ */
+void KuAQM0802A::send(bool CO, bool RS, char code) {
+    char data[2];
+    char CObit = CO ? 0x80 : 0x00;
+    char RSbit = RS ? 0x40 : 0x00;
+    data[0] = CObit | RSbit;
+    data[1] = code;
+    i2c.write(KU_AQM0802A_I2C_ADDR, data, 2);
+}