Diff: tlc5940.cpp

Revision:

0:64ea4d75027c

Child:

1:e8c8347fa919

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tlc5940.cpp	Sat Nov 27 00:28:33 2010 +0000
@@ -0,0 +1,84 @@
+#include "tlc5940.h"
+#include "mbed.h"
+
+/** Create a tlc5940 interface object connected to some specifics pins
+ *
+ * @param DC_data[] Dot Correction values for initialization
+ */
+tlc5940::tlc5940 (int DC_data[]) : VPROG(p21), SIN(p22), SCLK(p23), XLAT(p24), BLANK(p25), DCPROG(p27), GSCLK(p26), SOUT(p28), XERR(p29) {
+    first_cycle_flag = false;
+
+    // Pins in startup state
+    GSCLK = 0;
+    SCLK = 0;
+    VPROG = 1;
+    XLAT = 0;
+    BLANK = 1;
+    DCPROG = 0;
+    wait(0.01);
+
+    // DC input cycle starts
+    DCPROG = 1;
+    VPROG = 1;
+
+    for (int counter=0; counter < (2*96); counter++) {
+        SIN = DC_data[counter];
+        SCLK = 1;
+        wait_us(5);
+        SCLK = 0;
+        wait_us(5);
+    }
+    XLAT = 1;
+    wait_us(5);
+    XLAT = 0;
+    wait_us(5);
+    DCPROG = 0;
+    // DC input cycle ends
+}
+
+/** Send the specified set of grayscale values
+ *
+ * @param data[] Array of 12-bit Grayscale values for transmission
+ */
+void tlc5940::send_data (int data[]) {
+    // Grayscale data input + Grayscale PWM
+    data_counter = 0;
+    GSCLK_counter = 0;
+
+    if (VPROG == 1) {
+        VPROG = 0;
+        first_cycle_flag = true;
+    }
+
+    // Send the new data
+    BLANK = 0;
+    for (GSCLK_counter = 0; GSCLK_counter <= 4095; GSCLK_counter++) {
+        if (data_counter < 2*192) {
+            // Every new led consists of 12 bits
+            aux_ind = data_counter % 12;
+            if ( aux_ind == 0 ) aux_value = data[data_counter/12];
+            // Send the last bit
+            SIN = (aux_value >> aux_ind) & 0x01;
+
+            SCLK = 1;
+            GSCLK = 1;
+            SCLK = 0;
+            GSCLK = 0;
+
+            data_counter++;
+        } else {
+            GSCLK = 1;
+            GSCLK = 0;
+        }
+    }
+    BLANK = 1;
+
+    XLAT = 1;
+    XLAT = 0;
+
+    if (first_cycle_flag) {
+        SCLK = 1;
+        SCLK = 0;
+        first_cycle_flag = false;
+    }
+}