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@ -37,6 +37,16 @@
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#include "Descriptors.h"
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#if defined(RESET_TOGGLES_LIBUSB_COMPAT) || defined(__DOXYGEN__)
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static bool AVRISP_NeedCompatibilitySwitch ATTR_NO_INIT;
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/** Current AVRISP data IN endpoint address. */
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uint8_t AVRISP_CurrDataINEndpointAddress;
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/** Saved AVRISP data IN endpoint address in EEPROM. */
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uint8_t AVRISP_CurrDataINEndpointAddress_EEPROM EEMEM;
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#endif
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/** Device descriptor structure. This descriptor, located in FLASH memory, describes the overall
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* device characteristics, including the supported USB version, control endpoint size and the
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* number of device configurations. The descriptor is read out by the USB host when the enumeration
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@ -69,7 +79,7 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
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* and endpoints. The descriptor is read out by the USB host during the enumeration process when selecting
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* a configuration so that the host may correctly communicate with the USB device.
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*/
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const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor =
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USB_Descriptor_Configuration_t ConfigurationDescriptor =
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{
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.Config =
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{
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@ -106,7 +116,11 @@ const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor =
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{
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.Header = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
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#if defined(RESET_TOGGLES_LIBUSB_COMPAT)
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.EndpointAddress = 0,
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#else
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.EndpointAddress = AVRISP_DATA_IN_EPADDR,
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#endif
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.Attributes = (EP_TYPE_BULK | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
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.EndpointSize = AVRISP_DATA_EPSIZE,
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.PollingIntervalMS = 0x0A
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@ -174,7 +188,8 @@ const USB_Descriptor_String_t PROGMEM SerialString =
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*/
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uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
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const uint8_t wIndex,
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const void** const DescriptorAddress)
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const void** const DescriptorAddress,
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uint8_t* DescriptorMemorySpace)
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{
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const uint8_t DescriptorType = (wValue >> 8);
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const uint8_t DescriptorNumber = (wValue & 0xFF);
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@ -182,6 +197,8 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
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const void* Address = NULL;
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uint16_t Size = NO_DESCRIPTOR;
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*DescriptorMemorySpace = MEMSPACE_FLASH;
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switch (DescriptorType)
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{
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case DTYPE_Device:
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@ -189,6 +206,11 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
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Size = sizeof(USB_Descriptor_Device_t);
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break;
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case DTYPE_Configuration:
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*DescriptorMemorySpace = MEMSPACE_RAM;
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#if defined(RESET_TOGGLES_LIBUSB_COMPAT)
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ConfigurationDescriptor.AVRISP_DataInEndpoint.EndpointAddress = AVRISP_CurrDataINEndpointAddress;
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#endif
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Address = &ConfigurationDescriptor;
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Size = sizeof(USB_Descriptor_Configuration_t);
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break;
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@ -220,3 +242,70 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
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return Size;
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}
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#if defined(RESET_TOGGLES_LIBUSB_COMPAT) || defined(__DOXYGEN__)
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/** Checks the state of the system status register MCUSR and indicates via a flag if
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* the current AVRISP driver compatibility mode needs to be reset.
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*
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* When the \c RESET_TOGGLES_LIBUSB_COMPAT compile time option is enabled, pulling
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* the reset line of the AVR low will toggle between Jungo and libUSB compatibility
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* modes. Other forms of reset (such as power on or watchdog) will not force a mode
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* change.
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*/
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void CheckExternalReset(void)
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{
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/* If an external reset occured, we need to change compatibility mode */
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AVRISP_NeedCompatibilitySwitch = (MCUSR == (1 << EXTRF));
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MCUSR = 0;
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}
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/** Updates the device descriptors so that the correct compatibility mode is used
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* when the \c RESET_TOGGLES_LIBUSB_COMPAT compile time option is enabled. This
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* configures the programmer for either Jungo or libUSB driver compatibility. Each
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* time the AVR is reset via pulling the reset line low the compatibility mode will
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* be toggled. The current mode is stored in EEPROM and preserved through power
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* cycles of the AVR.
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*/
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void UpdateCurrentCompatibilityMode(void)
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{
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/* Load the current IN endpoint address stored in EEPROM */
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AVRISP_CurrDataINEndpointAddress = eeprom_read_byte(&AVRISP_CurrDataINEndpointAddress_EEPROM);
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/* Check if we need to switch compatibility modes */
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if (AVRISP_NeedCompatibilitySwitch)
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{
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/* Toggle between compatibility modes */
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AVRISP_CurrDataINEndpointAddress = (AVRISP_CurrDataINEndpointAddress == AVRISP_DATA_IN_EPADDR_LIBUSB) ?
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AVRISP_DATA_IN_EPADDR_JUNGO : AVRISP_DATA_IN_EPADDR_LIBUSB;
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/* Save the new mode into EEPROM */
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eeprom_update_byte(&AVRISP_CurrDataINEndpointAddress_EEPROM, AVRISP_CurrDataINEndpointAddress);
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}
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LEDs_SetAllLEDs(LEDS_NO_LEDS);
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/* Validate IN endpoint address and indicate current mode via LED flashes */
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switch (AVRISP_CurrDataINEndpointAddress)
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{
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default:
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/* Default to Jungo compatibility mode if saved EEPROM is invalid */
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AVRISP_CurrDataINEndpointAddress = AVRISP_DATA_IN_EPADDR_JUNGO;
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case AVRISP_DATA_IN_EPADDR_JUNGO:
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/* Two flashes for Jungo compatibility mode */
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for (uint8_t i = 0; i < 4; i++)
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{
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LEDs_ToggleLEDs(LEDS_ALL_LEDS);
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Delay_MS(100);
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}
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break;
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case AVRISP_DATA_IN_EPADDR_LIBUSB:
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/* Five flashes for libUSB compatibility mode */
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for (uint8_t i = 0; i < 10; i++)
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{
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LEDs_ToggleLEDs(LEDS_ALL_LEDS);
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Delay_MS(100);
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}
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break;
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}
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}
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#endif
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Dean Camera
13 years ago