Diff: TPixyInterface.cpp

Revision:

0:ef0e3c67dc5b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TPixyInterface.cpp	Mon Mar 14 00:35:23 2016 +0000
@@ -0,0 +1,113 @@
+#include "TPixyInterface.h"
+
+PixyInterfaceSPI::PixyInterfaceSPI(SPI* interface) : TPixyInterface(), spi(interface) {}
+
+void PixyInterfaceSPI::init()
+{
+    spi->frequency(1000000);
+}
+
+uint16_t PixyInterfaceSPI::getWord()
+{
+    // ordering is different (big endian) because Pixy is sending 16 bits through SPI
+    // instead of 2 bytes in a 16-bit word as with I2C
+    uint16_t w;
+    if (inQ.read(&w)) {
+        return w;
+    }
+    return getWordHw();
+}
+
+uint8_t PixyInterfaceSPI::getByte()
+{
+    //return SPI.transfer(0x00);
+    return spi->write(0x00);
+}
+
+int8_t PixyInterfaceSPI::send(uint8_t *data, uint8_t len)
+{
+    int i;
+    // check to see if we have enough space in our circular queue
+    if (outQ.freeLen() < len) {
+        return -1;
+    }
+    for (i = 0; i < len; i++) {
+        outQ.write(data[i]);
+    }
+    flushSend();
+    return len;
+}
+
+void PixyInterfaceSPI::setArg(uint16_t arg) {}
+
+uint16_t PixyInterfaceSPI::getWordHw()
+{
+    // ordering is different (big endian) because Pixy is sending 16 bits through SPI
+    // instead of 2 bytes in a 16-bit word as with I2C
+    uint16_t w;
+    uint8_t c, c_out = 0;
+
+    if (outQ.read(&c_out)) {
+        w = spi->write(PIXY_SYNC_BYTE_DATA);
+        //w = SPI.transfer(PIXY_SYNC_BYTE_DATA);
+    } else {
+        w = spi->write(PIXY_SYNC_BYTE);
+        //w = SPI.transfer(PIXY_SYNC_BYTE);
+    }
+    w <<= 8;
+    c = spi->write(c_out);
+    //c = SPI.transfer(cout);
+    w |= c;
+    return w;
+}
+
+void PixyInterfaceSPI::flushSend()
+{
+    uint16_t w;
+    while(outQ.len) {
+        w = getWordHw();
+        inQ.write(w);
+    }
+}
+
+
+
+
+template <class BufType> CircularQ<BufType>::CircularQ()
+{
+    len = 0;
+    writeIndex = 0;
+    readIndex = 0;
+}
+
+template <class BufType> bool CircularQ<BufType>::read(BufType *c)
+{
+    if (len) {
+        *c = buf[readIndex++];
+        len--;
+        if (readIndex == PIXY_BUF_SIZE) {
+            readIndex = 0;
+        }
+        return true;
+    } else {
+        return false;
+    }
+}
+
+template <class BufType> uint8_t CircularQ<BufType>::freeLen()
+{
+    return PIXY_BUF_SIZE - len;
+}
+
+template <class BufType> bool CircularQ<BufType>::write(BufType c)
+{
+    if (freeLen() == 0) {
+        return false;
+    }
+    buf[writeIndex++] = c;
+    len++;
+    if (writeIndex == PIXY_BUF_SIZE) {
+        writeIndex = 0;
+    }
+    return true;
+}
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