Diff: ToshibaTC62D723.cpp

Revision:

0:2b4bbe9ea495

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ToshibaTC62D723.cpp	Fri Sep 05 00:07:44 2014 +0000
@@ -0,0 +1,104 @@
+#include <cstddef>
+#include <string.h>
+#include "ToshibaTC62D723.hpp"
+
+bool gSpiMode;
+SPI* gSpiPtr = NULL;
+DigitalOut gbbTRANS(PA_4); // Global bit bang TRANS (data) line
+
+ToshibaTC62D723::ToshibaTC62D723(void)
+ : _dataIn(NULL),
+   _dataOut(NULL)
+{
+    memset(_channelBrightness, 0, sizeof(uint16_t) * NUM_CHANNELS);
+}
+
+ToshibaTC62D723::~ToshibaTC62D723(void)
+{
+    // Its good practice to clear memory in the destructor
+    memset(_channelBrightness, 0, sizeof(uint16_t) * NUM_CHANNELS);
+}
+
+void ToshibaTC62D723::shiftBrightnessDataIn(const uint16_t p_brightness)
+{
+    // TODO check return code?
+    s0(p_brightness);
+}
+
+void ToshibaTC62D723::outputBrightnessDataToLEDs(void)
+{
+    s1();
+}
+
+// S0 Command:
+//      Needs only SCK and SIN (which are SPI_SCK and SPI_MOSI respectively).
+//      This is because TRANS can be 0 for this command according to the datasheet.
+int ToshibaTC62D723::s0(const uint16_t p_value)
+{
+    if (p_value > 0 ) {
+        BAGINFO3("%x", p_value);
+    } else {
+        BAGINFO3(".");
+    }
+
+    // Command S0 and S1 share the same clock line, so we need to be
+    // careful which mode we are in.  This avoids re-initializing these
+    // pins if we are already in SPI mode.
+    // WARNING: Re-initializing every time makes the MOSI line dirty and
+    //          is wasteful for the CPU.
+    if ( gSpiMode == false &&
+         gSpiPtr  == NULL)
+    {
+        // We are not using MISO, this is a one-way bus
+        gSpiPtr = new SPI(SPI_MOSI, NC, SPI_SCK);
+
+        if (gSpiPtr == NULL) {
+            printf("ERROR: Could not allocate SPI\n");
+            return AERROR;
+        }
+
+        // Note: Polarity and phase are both 0 for the TC62D723FNG
+        // For a graphical reminder on polarity and phase, visit:
+        //     http://www.eetimes.com/document.asp?doc_id=1272534
+        gSpiPtr->format(16, 0);
+        // gSpiPtr->frequency(1000000);  // 1.5 MHz on the scope
+        gSpiPtr->frequency(24000000); // 24 MHz
+        gSpiMode = true;
+    }
+    gbbTRANS = 0; // Like an SPI slave select
+    gSpiPtr->write(p_value);
+    gbbTRANS = 1; // Like an SPI slave select
+
+    return AOK;
+}
+
+void ToshibaTC62D723::s1(void)
+{
+    BAGINFO3("\nLATCH\n");
+
+    int i = 0;
+    int j = 0;
+
+    gbbTRANS = 0;
+
+    if ( gSpiMode == true &&
+         gSpiPtr  != NULL)
+    {
+        delete gSpiPtr;
+        gSpiPtr  = NULL;
+        gSpiMode = false;
+    }
+
+    DigitalOut bbSCK (D13); // bit bang clock
+
+    bbSCK    = 0; // Start off/low
+    gbbTRANS = 1; // Set high
+
+    // Loop 6 times = 3 clock cycles
+    for (j=0; j<6; j++) { // Always use an even number here!
+        // The order of these two lines matter!
+        i == 0 ? i = 1 : i = 0;          // Toggle i
+        i == 0 ? bbSCK = 0 : bbSCK = 1;  // Set SCK to the same value as i
+    }
+    gbbTRANS = 0; // Set low
+}