added the sendCommand function (#209)

* Added sendCommand for SPI abstraction

Author: makermelissa

Adafruit_SPITFT.cpp

@@ -1632,6 +1632,51 @@ uint16_t Adafruit_SPITFT::color565(uint8_t red, uint8_t green, uint8_t blue) {
     return ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | (blue >> 3);
 }
 
+/*!
+ @brief   Adafruit_SPITFT Send Command handles complete sending of commands and data
+ @param   commandByte       The Command Byte
+ @param   dataBytes         A pointer to the Data bytes to send
+ @param   numDataBytes      The number of bytes we should send
+ */
+void Adafruit_SPITFT::sendCommand(uint8_t commandByte, uint8_t *dataBytes, uint8_t numDataBytes) {
+    SPI_BEGIN_TRANSACTION();
+    if(_cs >= 0) SPI_CS_LOW();
+  
+    SPI_DC_LOW(); // Command mode
+    spiWrite(commandByte); // Send the command byte
+  
+    SPI_DC_HIGH();
+    for (int i=0; i<numDataBytes; i++) {
+      spiWrite(*dataBytes); // Send the data bytes
+      dataBytes++;
+    }
+  
+    if(_cs >= 0) SPI_CS_HIGH();
+    SPI_END_TRANSACTION();
+}
+
+/*!
+ @brief   Adafruit_SPITFT Send Command handles complete sending of commands and const data
+ @param   commandByte       The Command Byte
+ @param   dataBytes         A pointer to the Data bytes to send
+ @param   numDataBytes      The number of bytes we should send
+ */
+void Adafruit_SPITFT::sendCommand(uint8_t commandByte, const uint8_t *dataBytes, uint8_t numDataBytes) {
+    SPI_BEGIN_TRANSACTION();
+    if(_cs >= 0) SPI_CS_LOW();
+  
+    SPI_DC_LOW(); // Command mode
+    spiWrite(commandByte); // Send the command byte
+  
+    SPI_DC_HIGH();
+    for (int i=0; i<numDataBytes; i++) {
+      spiWrite(pgm_read_byte(dataBytes++)); // Send the data bytes
+    }
+  
+    if(_cs >= 0) SPI_CS_HIGH();
+    SPI_END_TRANSACTION();
+}
+
 
 // -------------------------------------------------------------------------
 // Lowest-level hardware-interfacing functions. Many of these are inline and

Adafruit_SPITFT.h

@@ -187,6 +187,8 @@ class Adafruit_SPITFT : public Adafruit_GFX {
     void         startWrite(void);
     // Chip deselect and/or hardware SPI transaction end as needed:
     void         endWrite(void);
+    void         sendCommand(uint8_t commandByte, uint8_t *dataBytes = NULL, uint8_t numDataBytes = 0);
+    void         sendCommand(uint8_t commandByte, const uint8_t *dataBytes, uint8_t numDataBytes);
 
     // These functions require a chip-select and/or SPI transaction
     // around them. Higher-level graphics primitives might start a

library.properties

@@ -1,5 +1,5 @@
 name=Adafruit GFX Library
-version=1.4.8
+version=1.4.9
 author=Adafruit
 maintainer=Adafruit <[email protected]>
 sentence=Adafruit GFX graphics core library, this is the 'core' class that all our other graphics libraries derive from.