From 5b992cda512818dbba823d4a4cb5a60b88fcaaff Mon Sep 17 00:00:00 2001
From: Melissa LeBlanc-Williams <melissa@Melissas-MacBook-Pro.local>
Date: Fri, 12 Apr 2019 22:48:39 -0700
Subject: [PATCH] Added sendCommand for SPI abstraction

---
 Adafruit_SPITFT.cpp | 56 +++++++++++++++++++++++++++++++++++++++++++++
 Adafruit_SPITFT.h   |  3 +++
 2 files changed, 59 insertions(+)

diff --git a/Adafruit_SPITFT.cpp b/Adafruit_SPITFT.cpp
index 50bc71d..7ba554c 100644
--- a/Adafruit_SPITFT.cpp
+++ b/Adafruit_SPITFT.cpp
@@ -1632,6 +1632,62 @@ 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 a command
+ @param   commandByte       The Command Byte
+ */
+void Adafruit_SPITFT::sendCommand(uint8_t commandByte) {
+    uint8_t dataBytes = NULL;
+    sendCommand(commandByte, &dataBytes, 0);
+}
+
+/*!
+ @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
+    // Send the command byte
+    spiWrite(commandByte);
+  
+    SPI_DC_HIGH();
+    for (int i=0; i<numDataBytes; i++) {
+      // Send the data bytes
+      spiWrite(dataBytes);
+    }
+  
+    if(_cs >= 0) SPI_CS_HIGH();
+    SPI_END_TRANSACTION();
+}
+
 
 // -------------------------------------------------------------------------
 // Lowest-level hardware-interfacing functions. Many of these are inline and
diff --git a/Adafruit_SPITFT.h b/Adafruit_SPITFT.h
index 34f8102..39363b6 100644
--- a/Adafruit_SPITFT.h
+++ b/Adafruit_SPITFT.h
@@ -187,6 +187,9 @@ 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);
+    void         sendCommand(uint8_t commandByte, uint8_t *dataBytes, uint8_t numDataBytes);
+    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