From c12d27033f2191f48c391c9caedd21c461af62df Mon Sep 17 00:00:00 2001
From: David Barksdale <amatus@amatus.name>
Date: Wed, 6 Jan 2016 21:26:25 -0600
Subject: Laser tag demo code

You can select what data to send the other badge using the
up/down/left/right keys. Then use the trigger to fire the laser!
Up: Light LED red
Left: Light LED green
Right: Light LED blue
Down: Start playing music (press any key to stop)
---
 laser-tag software/main.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 43 insertions(+), 2 deletions(-)

diff --git a/laser-tag software/main.c b/laser-tag software/main.c
index a5ac1ba..53a381e 100755
--- a/laser-tag software/main.c	
+++ b/laser-tag software/main.c	
@@ -243,6 +243,7 @@ static dma_channel_t g_dacChan, g_fioChan;
 static lpuart_state_t g_lpuartState;
 static uint8_t rxBuff[1];
 static uint32_t shift0_buf[3];
+static uint32_t blank_led;
 
 static void led(uint8_t red, uint8_t green, uint8_t blue)
 {
@@ -279,6 +280,13 @@ static void lptmr_call_back(void)
             CMP_DRV_ConfigDacChn(0, &g_cmpDacConf);
         }
     }
+    // countdown to turn off LED
+    if (blank_led) {
+        if (blank_led == 1) {
+            led(0, 0, 0);
+        }
+        blank_led--;
+    }
 }
 
 /* Play music using the PIT timer */
@@ -335,7 +343,7 @@ void PIT_IRQHandler(void)
     }
 }
 
-uint8_t g_txBuff[] = { '$' };
+uint8_t g_txBuff[] = { 'R' };
 
 void PORTA_IRQHandler(void)
 {
@@ -355,6 +363,19 @@ void PORTA_IRQHandler(void)
     } else {
         LPUART_DRV_SendData(1, g_txBuff, 1);
     }
+
+    if (!GPIO_DRV_ReadPinInput(g_switchUp.pinName)) {
+        g_txBuff[0] = 'R';
+    }
+    if (!GPIO_DRV_ReadPinInput(g_switchLeft.pinName)) {
+        g_txBuff[0] = 'G';
+    }
+    if (!GPIO_DRV_ReadPinInput(g_switchRight.pinName)) {
+        g_txBuff[0] = 'B';
+    }
+    if (!GPIO_DRV_ReadPinInput(g_switchDown.pinName)) {
+        g_txBuff[0] = '!';
+    }
 }
 
 static void lpuartTxCallback(uint32_t instance, void *lpuartState)
@@ -371,10 +392,27 @@ static void lpuartRxCallback(uint32_t instance, void *lpuartState)
     bool parity_error = stat & LPUART_STAT_PF_MASK;
     LPUART_WR_STAT(base, (stat & 0x3e000000) |
             LPUART_STAT_NF_MASK | LPUART_STAT_FE_MASK | LPUART_STAT_PF_MASK);
-    if (rxBuff[0] == '$') {
+    if (rxBuff[0] == 'R') {
+        led(0xff, 0x00, 0x00);
+        blank_led = 30;
+        return;
+    }
+    if (rxBuff[0] == 'G') {
         led(0x00, 0xff, 0x00);
+        blank_led = 30;
         return;
     }
+    if (rxBuff[0] == 'B') {
+        led(0x00, 0x00, 0xff);
+        blank_led = 30;
+        return;
+    }
+    if (rxBuff[0] == '!') {
+        position = 0;
+        PIT_DRV_StartTimer(0, 0);
+        return;
+    }
+    return;
     if (noise) {
         led(0xff, 0xff, 0x00);
         return;
@@ -480,6 +518,9 @@ int main (void)
     TPM_DRV_Init(0, &tmpConfig);
     TPM_DRV_SetClock(0, kTpmClockSourceModuleMCGIRCLK, kTpmDividedBy1);
 
+    /* Blank LED just in case, saves power */
+    led(0x00, 0x00, 0x00);
+
     /* We're done, everything else is triggered through interrupts */
     for(;;) {
 #ifndef DEBUG
-- 
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