Diff: HT1621.cpp

Revision:

0:3001ada71ba5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HT1621.cpp	Sat Dec 21 13:29:11 2013 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+#include "HT1621.h"
+
+HT1621::HT1621(PinName wrPin, PinName dataPin, PinName csPin)
+:
+    wr(wrPin),
+    data(dataPin),
+    cs(csPin)
+{
+    wr = 1;
+    cs = 1;
+    
+    command(SYS_DIS);
+    wait(0.2);
+    command(SYS_EN);
+    command(RC_256K);
+    command(LCD_OFF);
+    
+    // Clear all segments
+    for (uint8_t i = 0; i < 64; i++) {
+        write(i, 0x00);
+    }
+    command(LCD_ON);
+}
+
+HT1621::~HT1621() {
+}
+
+void HT1621::command(uint8_t b) {
+    // 11 10  9  8| 7  6  5  4| 3  2  1  0
+    // --------+--+-----------+-----------
+    //  1  0  0|              command<8:0>
+    uint16_t word = 0x0800 | (b << 1);
+    
+    cs = 0;
+    for (uint8_t i = 11; i <= 11; i--) {
+        wr = 0;
+        data = word & (0x0001 << i) ? 1 : 0;
+        wr = 1;
+    }
+    cs = 1;
+}
+
+void HT1621::write(uint8_t addr, uint8_t b) {
+    // 12|11 10  9  8| 7  6  5  4| 3  2  1  0
+    // --+-----+-----+-----------+-----------
+    //  1  0  1|     address<5:0>|   seg<3:0>
+    uint16_t word = 0x1400 | ((addr & 0x3f) << 4) | (b & 0x0f);
+    
+    cs = 0;
+    for (uint8_t i = 12; i <= 12; i--) {
+        wr = 0;
+        data = word & (0x0001 << i) ? 1 : 0;
+        wr = 1;
+    }
+    cs = 1;
+}