From ff47ce4b9b9d7f9fe9bca12173adb67527954f87 Mon Sep 17 00:00:00 2001
From: William Miceli <git@williammiceli.me>
Date: Fri, 11 Jun 2021 13:35:24 -0400
Subject: [PATCH] "Debug_UART-USB" project finished, now needs to be debugged

---
 Telem_Debug/Debug_UART-USB/interrupts.c |  6 ++++++
 Telem_Debug/Debug_UART-USB/main.c       | 15 ++++++++++++---
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/Telem_Debug/Debug_UART-USB/interrupts.c b/Telem_Debug/Debug_UART-USB/interrupts.c
index a6a44ca..d2a3946 100644
--- a/Telem_Debug/Debug_UART-USB/interrupts.c
+++ b/Telem_Debug/Debug_UART-USB/interrupts.c
@@ -1,6 +1,7 @@
 #include "interrupts.h"
 
 extern volatile unsigned char status_flag;
+extern char* pUARTReceiveString;
 
 /*
  * Timer B CCR0 Interrupt Service Routine
@@ -27,3 +28,8 @@ __interrupt void TIMER0_B0_ISR(void){
           P8OUT &= ~LEDG;                           // Turn off the green LED
       }
 }
+
+#pragma vector = USCI_A2_VECTOR
+__interrupt void USCI_A2_ISR(void){
+    usci_A2_receiveString(pUARTReceiveString);
+}
diff --git a/Telem_Debug/Debug_UART-USB/main.c b/Telem_Debug/Debug_UART-USB/main.c
index 914d6fa..da86436 100644
--- a/Telem_Debug/Debug_UART-USB/main.c
+++ b/Telem_Debug/Debug_UART-USB/main.c
@@ -6,6 +6,8 @@
 #include "usci.h"
 
 volatile unsigned char status_flag = FALSE;
+char UARTTransmitString[] = "[DEBUG] Test Transmission String";
+char* pUARTReceiveString;
 
 int main(void) {
     WDTCTL = WDTPW | WDTHOLD;	                // Stop watchdog timer; `WDTPW` is the "WatchDog Timer PassWord", required for all `WDTCTL` operations
@@ -27,15 +29,22 @@ int main(void) {
 
     P8OUT |= LEDY0;                             // Initially set LEDY0 to High
 
+    pUARTReceiveString = calloc(1, 256 * sizeof(*pUARTReceiveString) + 1);
+
     usci_A2_enable();
     usci_A2_enableInterrupt();
 
-    char UARTTransmitString[] = "[DEBUG] Test Transmission String";
-    char* pUARTReceiveString = calloc(1, 256 * sizeof(*pUARTReceiveString) + 1);
-
     while(1)
     {
+        // Repeating debug transmission string
         usci_A2_transmitString(&UARTTransmitString[0]);
+
+        // String received, to be transmitted back
+        if(pUARTReceiveString[0] != '\0'){
+            usci_A2_transmitString(pUARTReceiveString);
+            pUARTReceiveString[0] = '\0';
+        }
+
         delayMultiplied(5000);
     }
 }