ADCTest DAC support for Teensy 3.1

- Vref of 1.2 V isn't working (may be due to missing setup/hardware)

Lib/mk20dx.h

@@ -10,10 +10,10 @@
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
- * 1. The above copyright notice and this permission notice shall be 
+ * 1. The above copyright notice and this permission notice shall be
  * included in all copies or substantial portions of the Software.
  *
- * 2. If the Software is incorporated into a build system that allows 
+ * 2. If the Software is incorporated into a build system that allows
  * selection among a list of target devices, then similar target
  * devices manufactured by PJRC.COM must be included in the list of
  * target devices and selectable in the same manner.

LoadFile/load

@@ -7,6 +7,7 @@ if [ ! -e teensy-loader-cli/teensy-loader-cli ]; then
 	cd teensy-loader-cli
 	cmake @CMAKE_SOURCE_DIR@/LoadFile
 	make
+	cd -
 fi
 
 #| Loads the hex file onto the teensy

Scan/ADCTest/defaultMap.h

@@ -28,91 +28,10 @@
 // Default 1-indexed key mappings
 static uint8_t DefaultMap_Lookup[] = {
 				0, // 0x00
-				KEY_1, // 0x01
+				0, // 0x01
-				KEY_Q, // 0x02
+				0, // 0x02
-				KEY_A, // 0x03
+				0, // 0x03
-				KEY_2, // 0x04
+				0, // 0x04
-				KEY_Z, // 0x05
-				KEY_W, // 0x06
-				KEY_S, // 0x07
-				KEY_3, // 0x08
-				KEY_X, // 0x09
-				KEY_E, // 0x0A
-				KEY_D, // 0x0B
-				KEY_4, // 0x0C
-				KEY_C, // 0x0D
-				KEY_R, // 0x0E
-				KEY_F, // 0x0F
-				KEY_5, // 0x10
-				KEY_V, // 0x11
-				KEY_T, // 0x12
-				KEY_G, // 0x13
-				KEY_6, // 0x14
-				KEY_B, // 0x15
-				KEY_Y, // 0x16
-				KEY_H, // 0x17
-				KEY_7, // 0x18
-				KEY_N, // 0x19
-				KEY_U, // 0x1A
-				KEY_J, // 0x1B
-				KEY_8, // 0x1C
-				KEY_M, // 0x1D
-				KEY_I, // 0x1E
-				KEY_K, // 0x1F
-				KEY_9, // 0x20
-				KEY_COMMA, // 0x21
-				KEY_O, // 0x22
-				KEY_L, // 0x23
-				KEY_0, // 0x24
-				KEY_PERIOD, // 0x25
-				KEY_P, // 0x26
-				KEY_SEMICOLON, // 0x27
-				KEY_MINUS, // 0x28
-				KEY_SLASH, // 0x29
-				KEY_LEFT_BRACE, // 0x2A (1/4)
-				KEY_QUOTE, // 0x2B
-				KEY_EQUAL, // 0x2C
-				KEY_RIGHT_BRACE, // 0x2D
-				0, // 0x2E
-				0, // 0x2F
-				KEY_TILDE, // 0x30
-				KEY_TAB, // 0x31
-				0, // 0x32
-				0, // 0x33
-				KEY_SHIFT, // 0x34
-				KEY_ENTER, // 0x35
-				KEY_BACKSPACE, // 0x36
-				KEY_DELETE, // 0x37
-				KEY_CTRL, // 0x38 (MAR LEFT)
-				KEY_SPACE, // 0x39
-				KEY_ALT, // 0x3A (EXPRESS / MAR RIGHT)
-				0, // 0x3B
-				0, // 0x3C
-				KEY_ESC, // 0x3D (MAR REL)
-				0, // 0x3E (STORE)
-				0, // 0x3F (RECALL)
-				KEY_GUI, // 0x40 (CODE)
-				0, // 0x41
-				0, // 0x42
-				0, // 0x43
-				0, // 0x44
-				0, // 0x45
-				0, // 0x46
-				0, // 0x47
-				0, // 0x48 (DEC TAB)
-				0, // 0x49 (SET TAB)
-				0, // 0x4A (TAB CLEAR)
-				0, // 0x4B (INDEX)
-				0, // 0x4C (RELOC)
-				0, // 0x4D
-				0, // 0x4E
-				0, // 0x4F
-				0, // 0x50 (REV INDEX)
-				0, // 0x51
-				0, // 0x52
-				0, // 0x53
-				0, // 0x54
-				0, // 0x55
 };
 
 

Scan/ADCTest/scan_loop.c

@@ -44,7 +44,9 @@
 
 // ----- Function Declarations -----
 
-void cliFunc_echo( char* args );
+void cliFunc_dac    ( char* args );
+void cliFunc_dacVref( char* args );
+void cliFunc_echo   ( char* args );
 
 
 
@@ -58,7 +60,11 @@ volatile uint8_t KeyIndex_BufferUsed;
 // Scan Module command dictionary
 char*       scanCLIDictName = "ADC Test Module Commands";
 CLIDictItem scanCLIDict[] = {
-	{ "echo", "Example command, echos the arguments.", cliFunc_echo },
+#if defined(_mk20dx256_) // DAC is only supported on Teensy 3.1
+	{ "dac",     "Set DAC output value, from 0 to 4095 (1/4096 Vref to Vref).", cliFunc_dac },
+	{ "dacVref", "Set DAC Vref. 0 is 1.2V. 1 is 3.3V.", cliFunc_dacVref },
+#endif
+	{ "echo",    "Example command, echos the arguments.", cliFunc_echo },
 	{ 0, 0, 0 } // Null entry for dictionary end
 };
 
@@ -77,6 +83,12 @@ inline void Scan_setup()
 {
 	// Register Scan CLI dictionary
 	CLI_registerDictionary( scanCLIDict, scanCLIDictName );
+
+#if defined(_mk20dx256_) // DAC is only supported on Teensy 3.1
+	// DAC Setup
+	SIM_SCGC2 |= SIM_SCGC2_DAC0;
+	DAC0_C0 = DAC_C0_DACEN | DAC_C0_DACRFS; // 3.3V VDDA is DACREF_2
+#endif
 }
 #endif
 
@@ -131,3 +143,44 @@ void cliFunc_echo( char* args )
 	}
 }
 
+void cliFunc_dac( char* args )
+{
+#if defined(_mk20dx256_) // DAC is only supported on Teensy 3.1
+	// Parse code from argument
+	//  NOTE: Only first argument is used
+	char* arg1Ptr;
+	char* arg2Ptr;
+	CLI_argumentIsolation( args, &arg1Ptr, &arg2Ptr );
+
+	int dacOut = decToInt( arg1Ptr );
+
+	// Make sure the value is between 0 and 4096, otherwise ignore
+	if ( dacOut >= 0 && dacOut <= 4095 )
+	{
+		*(int16_t *) &(DAC0_DAT0L) = dacOut;
+	}
+#endif
+}
+
+void cliFunc_dacVref( char* args )
+{
+#if defined(_mk20dx256_) // DAC is only supported on Teensy 3.1
+	// Parse code from argument
+	//  NOTE: Only first argument is used
+	char* arg1Ptr;
+	char* arg2Ptr;
+	CLI_argumentIsolation( args, &arg1Ptr, &arg2Ptr );
+
+	switch ( decToInt( arg1Ptr ) )
+	{
+	case 0:
+		// XXX Doesn't seem to work...
+		DAC0_C0 = DAC_C0_DACEN; // 1.2V ref is DACREF_1
+		break;
+	case 1:
+		DAC0_C0 = DAC_C0_DACEN | DAC_C0_DACRFS; // 3.3V VDDA is DACREF_2
+		break;
+	}
+#endif
+}
+

Scan/ADCTest/scan_loop.h

@@ -33,7 +33,7 @@
 
 // ----- Defines -----
 
-#define KEYBOARD_KEYS 0x7F // 127 - Size of the array space for the keyboard(max index)
+#define KEYBOARD_KEYS 0x5  // 5 - Size of the array space for the keyboard(max index)
 #define KEYBOARD_BUFFER 24 // Max number of key signals to buffer