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inc/Key.c

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+/* Key.c
+ * Students put your names here
+ * Modified: October 2, 2023
+ * 4-bit keyboard connected to PB19-PB16
+ * Piano key 3 PB19 (note with highest frequency)
+ * Piano key 2 PB18
+ * Piano key 1 PB17
+ * Piano key 0 PB16 (note with lowest frequency)
+ *
+ */
+#include <ti/devices/msp/msp.h>
+#define PB16INDEX 32 // UART2_RX  SPI1_SCK  UART3_RTS TIMG8_C1  TIMG7_C1
+#define PB17INDEX 42 // UART2_TX  SPI0_PICO SPI1_CS1  TIMA1_C0  TIMA0_C2
+#define PB18INDEX 43 // UART2_RX  SPI0_SCK  SPI1_CS2  TIMA1_C1  TIMA0_C2N
+#define PB19INDEX 44 // COMP2_OUT SPI0_POCI TIMG8_C1  UART0_CTS TIMG7_C1
+#include "../inc/LaunchPad.h"
+
+// **************Key_Init*********************
+// Initialize piano key inputs on PB19-PB16
+// Input: none
+// Output: none
+void Key_Init(void){
+// Assumes LaunchPad_Init has been called
+// I.e., PortB has already been reset and activated (do not reset PortB here again)
+    // regular inputs
+//  IOMUX->SECCFG.PINCM[PB16INDEX] = 0x00040081; // regular GPIO input
+//  IOMUX->SECCFG.PINCM[PB17INDEX] = 0x00040081; // regular GPIO input
+//  IOMUX->SECCFG.PINCM[PB18INDEX] = 0x00040081; // regular GPIO input
+//  IOMUX->SECCFG.PINCM[PB19INDEX] = 0x00040081; // regular GPIO input
+  // PCB camp board
+  IOMUX->SECCFG.PINCM[PA28INDEX] = 0x00040081; // input, no pull
+  IOMUX->SECCFG.PINCM[PA27INDEX] = 0x00040081; // input, no pull
+//  IOMUX->SECCFG.PINCM[PA26INDEX] = 0x00040081; // input, no pull
+ //IOMUX->SECCFG.PINCM[PA25INDEX] = 0x00040081; // input, no pull
+ //IOMUX->SECCFG.PINCM[PA24INDEX] = 0x00040081; // input, no pull
+ // red board
+ // IOMUX->SECCFG.PINCM[PA16INDEX] = 0x00040081; // input, no pull
+ // IOMUX->SECCFG.PINCM[PA15INDEX] = 0x00040081; // input, no pull
+  // green board
+  IOMUX->SECCFG.PINCM[PA17INDEX] = 0x00040081; // input, no pull
+  IOMUX->SECCFG.PINCM[PA16INDEX] = 0x00040081; // input, no pull
+}
+
+// **************Key_In*********************
+// Input from piano key inputs on PB19-PB16
+// Input: none
+// Output: 0 to 15 depending on keys
+//   0x01 is just Key0, 0x02 is just Key1, 0x04 is just Key2, 0x08 is just Key3
+uint32_t Key_In(void){
+    // regular Lab5
+ // return (GPIOB->DIN31_0>>16)&0x000F;
+    uint32_t data = GPIOA->DIN31_0;
+   // return (data>>24)&0x0F;
+    // red board
+    //return ((data>>15)&0x03) | ((data&((1<<28)|(1<<27)))>>25);
+    // green board
+   return ((data>>16)&0x03) | ((data&((1<<28)|(1<<27)))>>25);
+
+}