From ba02d346d2f56490bca9f1b48de020d6a4bf5b84 Mon Sep 17 00:00:00 2001
From: Sandeep Mistry <s.mistry@arduino.cc>
Date: Fri, 4 Mar 2016 15:16:31 -0500
Subject: [PATCH] Add USB transfer RX/TX LED blinking
Only enabled if PIN_LED_TXL or PIN_LED_RXL is defined
---
cores/arduino/USB/USBCore.cpp | 41 +++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/cores/arduino/USB/USBCore.cpp b/cores/arduino/USB/USBCore.cpp
index cd356d57..af040e28 100644
--- a/cores/arduino/USB/USBCore.cpp
+++ b/cores/arduino/USB/USBCore.cpp
@@ -28,6 +28,14 @@
USBDevice_SAMD21G18x usbd;
+/** Pulse generation counters to keep track of the number of milliseconds remaining for each pulse type */
+#define TX_RX_LED_PULSE_MS 100
+#ifdef PIN_LED_TXL
+static volatile uint8_t txLEDPulse; /**< Milliseconds remaining for data Tx LED pulse */
+#endif
+#ifdef PIN_LED_RXL
+static volatile uint8_t rxLEDPulse; /**< Milliseconds remaining for data Rx LED pulse */
+#endif
static char isRemoteWakeUpEnabled = 0;
static char isEndpointHalt = 0;
@@ -273,6 +281,18 @@ void USBDeviceClass::handleEndpoint(uint8_t ep)
void USBDeviceClass::init()
{
+#ifdef PIN_LED_TXL
+ txLEDPulse = 0;
+ pinMode(PIN_LED_TXL, OUTPUT);
+ digitalWrite(PIN_LED_TXL, HIGH);
+#endif
+
+#ifdef PIN_LED_RXL
+ rxLEDPulse = 0;
+ pinMode(PIN_LED_RXL, OUTPUT);
+ digitalWrite(PIN_LED_RXL, HIGH);
+#endif
+
// Enable USB clock
PM->APBBMASK.reg |= PM_APBBMASK_USB;
@@ -522,6 +542,11 @@ uint32_t USBDeviceClass::recv(uint32_t ep, void *_data, uint32_t len)
if (available(ep) < len)
len = available(ep);
+#ifdef PIN_LED_RXL
+ digitalWrite(PIN_LED_RXL, LOW);
+ rxLEDPulse = TX_RX_LED_PULSE_MS;
+#endif
+
armRecv(ep);
usbd.epBank0DisableTransferComplete(ep);
@@ -620,6 +645,11 @@ uint32_t USBDeviceClass::send(uint32_t ep, const void *data, uint32_t len)
}
#endif
+#ifdef PIN_LED_TXL
+ digitalWrite(PIN_LED_TXL, LOW);
+ txLEDPulse = TX_RX_LED_PULSE_MS;
+#endif
+
// Flash area
while (len != 0)
{
@@ -826,6 +856,17 @@ void USBDeviceClass::ISRHandler()
if (usbd.isStartOfFrameInterrupt())
{
usbd.ackStartOfFrameInterrupt();
+
+ // check whether the one-shot period has elapsed. if so, turn off the LED
+#ifdef PIN_LED_TXL
+ if (txLEDPulse && !(--txLEDPulse))
+ digitalWrite(PIN_LED_TXL, HIGH);
+#endif
+
+#ifdef PIN_LED_RXL
+ if (rxLEDPulse && !(--rxLEDPulse))
+ digitalWrite(PIN_LED_RXL, HIGH);
+#endif
}
// Endpoint 0 Received Setup interrupt
--
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