Add branch for the conversion of demos to use standard C header files for configurati...

[pub/USBasp.git] / Bootloaders / CDC / BootloaderCDC.c

diff --git a/Bootloaders/CDC/BootloaderCDC.c b/Bootloaders/CDC/BootloaderCDC.c
index e9ea8ae..211b054 100644 (file)
--- a/Bootloaders/CDC/BootloaderCDC.c
+++ b/Bootloaders/CDC/BootloaderCDC.c
@@ -56,6 +56,28 @@ static uint32_t CurrAddress;
  */
 static bool RunBootloader = true;
 
+/** Magic lock for forced application start. If the HWBE fuse is programmed and BOOTRST is unprogrammed, the bootloader
+ *  will start if the /HWB line of the AVR is held low and the system is reset. However, if the /HWB line is still held
+ *  low when the application attempts to start via a watchdog reset, the bootloader will re-start. If set to the value
+ *  \ref MAGIC_BOOT_KEY the special init function \ref Application_Jump_Check() will force the application to start.
+ */
+uint32_t MagicBootKey ATTR_NO_INIT;
+
+
+/** Special startup routine to check if the bootloader was started via a watchdog reset, and if the magic application
+ *  start key has been loaded into \ref MagicBootKey. If the bootloader started via the watchdog and the key is valid,
+ *  this will force the user application to start via a software jump.
+ */
+void Application_Jump_Check(void)
+{
+       /* If the reset source was the bootloader and the key is correct, clear it and jump to the application */
+       if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY))
+       {
+               MagicBootKey = 0;
+               // cppcheck-suppress constStatement
+               ((void (*)(void))0x0000)();
+       }
+}
 
 /** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
  *  runs the bootloader processing routine until instructed to soft-exit, or hard-reset via the watchdog to start
@@ -80,6 +102,9 @@ int main(void)
 
        /* Disconnect from the host - USB interface will be reset later along with the AVR */
        USB_Detach();
+       
+       /* Unlock the forced application start mode of the bootloader if it is restarted */
+       MagicBootKey = MAGIC_BOOT_KEY;
 
        /* Enable the watchdog and force a timeout to reset the AVR */
        wdt_enable(WDTO_250MS);
@@ -122,17 +147,12 @@ ISR(TIMER1_OVF_vect, ISR_BLOCK)
 void EVENT_USB_Device_ConfigurationChanged(void)
 {
        /* Setup CDC Notification, Rx and Tx Endpoints */
-       Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
-                                  ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
-                                  ENDPOINT_BANK_SINGLE);
+       Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT,
+                                  CDC_NOTIFICATION_EPSIZE, 1);
 
-       Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
-                                  ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
-                                  ENDPOINT_BANK_SINGLE);
+       Endpoint_ConfigureEndpoint(CDC_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
 
-       Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
-                                  ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
-                                  ENDPOINT_BANK_SINGLE);
+       Endpoint_ConfigureEndpoint(CDC_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
 }
 
 /** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
@@ -303,7 +323,7 @@ static void ReadWriteMemoryBlock(const uint8_t Command)
 static uint8_t FetchNextCommandByte(void)
 {
        /* Select the OUT endpoint so that the next data byte can be read */
-       Endpoint_SelectEndpoint(CDC_RX_EPNUM);
+       Endpoint_SelectEndpoint(CDC_RX_EPADDR);
 
        /* If OUT endpoint empty, clear it and wait for the next packet from the host */
        while (!(Endpoint_IsReadWriteAllowed()))
@@ -329,7 +349,7 @@ static uint8_t FetchNextCommandByte(void)
 static void WriteNextResponseByte(const uint8_t Response)
 {
        /* Select the IN endpoint so that the next data byte can be written */
-       Endpoint_SelectEndpoint(CDC_TX_EPNUM);
+       Endpoint_SelectEndpoint(CDC_TX_EPADDR);
 
        /* If IN endpoint full, clear it and wait until ready for the next packet to the host */
        if (!(Endpoint_IsReadWriteAllowed()))
@@ -353,7 +373,7 @@ static void WriteNextResponseByte(const uint8_t Response)
 static void CDC_Task(void)
 {
        /* Select the OUT endpoint */
-       Endpoint_SelectEndpoint(CDC_RX_EPNUM);
+       Endpoint_SelectEndpoint(CDC_RX_EPADDR);
 
        /* Check if endpoint has a command in it sent from the host */
        if (!(Endpoint_IsOUTReceived()))
@@ -549,7 +569,7 @@ static void CDC_Task(void)
        }
 
        /* Select the IN endpoint */
-       Endpoint_SelectEndpoint(CDC_TX_EPNUM);
+       Endpoint_SelectEndpoint(CDC_TX_EPADDR);
 
        /* Remember if the endpoint is completely full before clearing it */
        bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
@@ -577,7 +597,7 @@ static void CDC_Task(void)
        }
 
        /* Select the OUT endpoint */
-       Endpoint_SelectEndpoint(CDC_RX_EPNUM);
+       Endpoint_SelectEndpoint(CDC_RX_EPADDR);
 
        /* Acknowledge the command from the host */
        Endpoint_ClearOUT();