Add partial project documentation to the incomplete PrinterHost demo.
Change over Printer_GetDeviceID() to require a pointer to the destination buffer plus the buffer size, rather than using a pointer to a special structure. Make new Printer_SendData() function to hide the implementation of sending data to an attached printer, cleaning up the main demo source file body.
This commit is contained in:
Dean Camera
parent
d3fb6273aa
commit
786479faf0
7 changed files with 110 additions and 62 deletions
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@ -61,7 +61,7 @@ uint8_t ProcessConfigurationDescriptor(void)
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/* Get the printer interface from the configuration descriptor */
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if ((ErrorCode = USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
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NextBidirectionalPrinterInterface)))
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DComp_NextBidirectionalPrinterInterface)))
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{
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/* Descriptor not found, error out */
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return NoInterfaceFound;
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@ -70,12 +70,12 @@ uint8_t ProcessConfigurationDescriptor(void)
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PrinterInterfaceNumber = DESCRIPTOR_CAST(ConfigDescriptorData, USB_Descriptor_Interface_t).InterfaceNumber;
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PrinterAltSetting = DESCRIPTOR_CAST(ConfigDescriptorData, USB_Descriptor_Interface_t).AlternateSetting;
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/* Get the IN and OUT data endpoints for the mass storage interface */
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/* Get the IN and OUT data endpoints for the printer interface */
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while (FoundEndpoints != ((1 << PRINTER_DATA_OUT_PIPE) | (1 << PRINTER_DATA_IN_PIPE)))
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{
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/* Fetch the next bulk endpoint from the current printer interface */
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if ((ErrorCode = USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
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NextInterfaceBulkDataEndpoint)))
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DComp_NextInterfaceBulkDataEndpoint)))
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{
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/* Descriptor not found, error out */
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return NoEndpointFound;
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@ -112,16 +112,16 @@ uint8_t ProcessConfigurationDescriptor(void)
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return SuccessfulConfigRead;
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}
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uint8_t NextBidirectionalPrinterInterface(void* CurrentDescriptor)
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uint8_t DComp_NextBidirectionalPrinterInterface(void* CurrentDescriptor)
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{
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/* PURPOSE: Find next Bidirectional protocol printer class interface descriptor */
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/* PURPOSE: Find next bidirectional protocol printer class interface descriptor */
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if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
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{
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/* Check the descriptor class and protocol, break out if correct class/protocol interface found */
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if ((DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Class == PRINTER_CLASS) &&
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(DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).SubClass == PRINTER_SUBCLASS) &&
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(DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == PROTOCOL_BIDIRECTIONAL))
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(DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == PRINTER_PROTOCOL))
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{
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return DESCRIPTOR_SEARCH_Found;
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}
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@ -130,7 +130,7 @@ uint8_t NextBidirectionalPrinterInterface(void* CurrentDescriptor)
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return DESCRIPTOR_SEARCH_NotFound;
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}
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uint8_t NextInterfaceBulkDataEndpoint(void* CurrentDescriptor)
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uint8_t DComp_NextInterfaceBulkDataEndpoint(void* CurrentDescriptor)
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{
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/* PURPOSE: Find next interface bulk endpoint descriptor before next interface descriptor */
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@ -35,35 +35,48 @@
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#include <LUFA/Drivers/USB/USB.h>
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#include "PrinterHost.h"
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#include "Lib/PrinterCommands.h"
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/* Macros: */
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/** Interface Class value for the Printer Device class */
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#define PRINTER_CLASS 0x07
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/** Interface Subclass value for the Printer Device class */
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#define PRINTER_SUBCLASS 0x01
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/** Interface Protocol value for a Bidirectional communication encapsulation */
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#define PRINTER_PROTOCOL 0x02
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#define PRINTER_DATA_OUT_PIPE 1
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#define PRINTER_DATA_IN_PIPE 2
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/** Maximum size of a device configuration descriptor which can be processed by the host, in bytes */
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#define MAX_CONFIG_DESCRIPTOR_SIZE 512
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/* Enums: */
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/** Enum for the possible return codes of the ProcessConfigurationDescriptor() function. */
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enum PrinterHost_GetConfigDescriptorDataCodes_t
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{
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SuccessfulConfigRead = 0,
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ControlError = 1,
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DescriptorTooLarge = 2,
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InvalidConfigDataReturned = 3,
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NoInterfaceFound = 4,
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NoEndpointFound = 5,
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SuccessfulConfigRead = 0, /**< Configuration Descriptor was processed successfully */
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ControlError = 1, /**< A control request to the device failed to complete successfully */
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DescriptorTooLarge = 2, /**< The device's Configuration Descriptor is too large to process */
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InvalidConfigDataReturned = 3, /**< The device returned an invalid Configuration Descriptor */
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NoInterfaceFound = 4, /**< A compatible printer interface was not found in the device's Configuration Descriptor */
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NoEndpointFound = 5, /**< The printer data endpoints were not found in the device's Configuration Descriptor */
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};
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/* External Variables: */
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/** Interface index of the Bidirectional Printer interface within the device, once the Configuration
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* Descriptor has been processed.
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*/
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uint8_t PrinterInterfaceNumber;
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/** Interface Alternate Setting index of the Bidirectional Printer interface within the device, once
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* the Configuration Descriptor has been processed.
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*/
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uint8_t PrinterAltSetting;
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/* Function Prototypes: */
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uint8_t ProcessConfigurationDescriptor(void);
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uint8_t NextBidirectionalPrinterInterface(void* CurrentDescriptor);
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uint8_t NextInterfaceBulkDataEndpoint(void* CurrentDescriptor);
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uint8_t DComp_NextBidirectionalPrinterInterface(void* CurrentDescriptor);
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uint8_t DComp_NextInterfaceBulkDataEndpoint(void* CurrentDescriptor);
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#endif
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@ -30,7 +30,33 @@
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#include "PrinterCommands.h"
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uint8_t Printer_GetDeviceID(Device_ID_String_t* DeviceIDString)
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uint8_t Printer_SendData(char* PrinterCommands)
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{
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uint8_t ErrorCode;
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Pipe_SelectPipe(PRINTER_DATA_OUT_PIPE);
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Pipe_Unfreeze();
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if ((ErrorCode = Pipe_Write_Stream_LE(PrinterCommands, strlen(PrinterCommands))) != PIPE_RWSTREAM_NoError)
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return ErrorCode;
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Pipe_ClearOUT();
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while (!(Pipe_IsOUTReady()));
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Pipe_Freeze();
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return PIPE_RWSTREAM_NoError;
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}
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/** Issues a Printer class Get Device ID command to the attached device, to retrieve the device ID string (which indicates
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* the accepted printer languages, the printer's model and other pertinent information).
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*
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* \param[out] DeviceIDString Pointer to the destination where the returned string should be stored
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* \param[in] BufferSize Size in bytes of the allocated buffer for the returned Device ID string
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*
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* \return A value from the USB_Host_SendControlErrorCodes_t enum
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*/
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uint8_t Printer_GetDeviceID(char* DeviceIDString, uint8_t BufferSize)
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{
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uint8_t ErrorCode = HOST_SENDCONTROL_Successful;
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uint16_t DeviceIDStringLength;
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@ -41,28 +67,34 @@ uint8_t Printer_GetDeviceID(Device_ID_String_t* DeviceIDString)
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bRequest: GET_DEVICE_ID,
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wValue: 0,
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wIndex: 0,
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wLength: sizeof(DeviceIDString->Length),
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wLength: sizeof(DeviceIDStringLength),
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};
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if ((ErrorCode = USB_Host_SendControlRequest(DeviceIDString)) != HOST_SENDCONTROL_Successful)
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if ((ErrorCode = USB_Host_SendControlRequest(&DeviceIDStringLength)) != HOST_SENDCONTROL_Successful)
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return ErrorCode;
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DeviceIDStringLength = SwapEndian_16(DeviceIDString->Length);
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DeviceIDStringLength = SwapEndian_16(DeviceIDStringLength);
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/* Protect against overflow for the null terminator if the string length is equal to or larger than the buffer */
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if (DeviceIDStringLength >= sizeof(DeviceIDString->String))
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DeviceIDStringLength = sizeof(DeviceIDString->String) - 1;
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if (DeviceIDStringLength > BufferSize)
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DeviceIDStringLength = BufferSize;
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USB_ControlRequest.wLength = DeviceIDStringLength;
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USB_ControlRequest.wLength = (DeviceIDStringLength - 1);
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if ((ErrorCode = USB_Host_SendControlRequest(DeviceIDString)) != HOST_SENDCONTROL_Successful)
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return ErrorCode;
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DeviceIDString->String[DeviceIDStringLength] = 0x00;
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DeviceIDString[DeviceIDStringLength] = 0x00;
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return HOST_SENDCONTROL_Successful;
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}
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/** Issues a Printer class Get Port Status command to the attached device, to retrieve the current status flags of the
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* printer.
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*
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* \param[out] PortStatus Pointer to the destination where the printer's status flag values should be stored
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*
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* \return A value from the USB_Host_SendControlErrorCodes_t enum
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*/
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uint8_t Printer_GetPortStatus(uint8_t* PortStatus)
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{
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USB_ControlRequest = (USB_Request_Header_t)
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@ -77,6 +109,11 @@ uint8_t Printer_GetPortStatus(uint8_t* PortStatus)
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return USB_Host_SendControlRequest(PortStatus);
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}
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/** Issues a Printer class Soft Reset command to the attached device, to reset the printer ready for new input without
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* physically cycling the printer's power.
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*
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* \return A value from the USB_Host_SendControlErrorCodes_t enum
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*/
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uint8_t Printer_SoftReset(void)
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{
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USB_ControlRequest = (USB_Request_Header_t)
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@ -33,27 +33,29 @@
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/* Includes: */
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#include <avr/io.h>
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#include <string.h>
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#include <LUFA/Drivers/USB/USB.h>
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/* Macros: */
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#define PROTOCOL_UNIDIRECTIONAL 0x01
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#define PROTOCOL_BIDIRECTIONAL 0x02
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#define PROTOCOL_IEEE1284 0x03
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/** Printer class-specific request to retrieve the printer's ID string */
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#define GET_DEVICE_ID 0
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/** Printer class-specific request to retrieve the printer's virtual port status flags */
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#define GET_PORT_STATUS 1
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/** Printer class-specific request to soft-reset the device */
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#define SOFT_RESET 2
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/* Type Defines: */
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typedef struct
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{
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uint16_t Length;
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uint8_t String[128];
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} Device_ID_String_t;
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/** Pipe number of the Printer data IN pipe */
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#define PRINTER_DATA_IN_PIPE 1
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/** Pipe number of the Printer data OUT pipe */
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#define PRINTER_DATA_OUT_PIPE 2
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/* Function Prototypes: */
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uint8_t Printer_GetDeviceID(Device_ID_String_t* DeviceIDString);
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uint8_t Printer_SendData(char* PrinterCommands);
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uint8_t Printer_GetDeviceID(char* DeviceIDString, uint8_t BufferSize);
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uint8_t Printer_GetPortStatus(uint8_t* PortStatus);
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uint8_t Printer_SoftReset(void);
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@ -150,7 +150,7 @@ void USB_Printer_Host(void)
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}
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/* Some printers use alternate settings to determine the communication protocol used - if so, send a SetInterface
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* request to switch to the interface alternate setting with the Bidirection protocol */
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* request to switch to the interface alternate setting with the Bidirectional protocol */
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if (PrinterAltSetting)
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{
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USB_ControlRequest = (USB_Request_Header_t)
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@ -181,8 +181,8 @@ void USB_Printer_Host(void)
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case HOST_STATE_Configured:
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puts_P(PSTR("Retrieving Device ID...\r\n"));
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Device_ID_String_t DeviceIDString;
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if ((ErrorCode = Printer_GetDeviceID(&DeviceIDString)) != HOST_SENDCONTROL_Successful)
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char DeviceIDString[128];
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if ((ErrorCode = Printer_GetDeviceID(DeviceIDString, sizeof(DeviceIDString))) != HOST_SENDCONTROL_Successful)
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{
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puts_P(PSTR("Control Error (Get DeviceID).\r\n"));
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printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
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@ -195,7 +195,7 @@ void USB_Printer_Host(void)
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break;
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}
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printf_P(PSTR("Printer Device ID: %s\r\n"), DeviceIDString.String);
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printf_P(PSTR("Printer Device ID: %s\r\n"), DeviceIDString);
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puts_P(PSTR("Printer Enumerated.\r\n"));
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@ -205,30 +205,25 @@ void USB_Printer_Host(void)
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/* Indicate device busy via the status LEDs */
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LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
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//--------------------------------------------------------------
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#define TEST_TEXT_PAGE "\033%-12345X\033E LUFA PCL Test Page \033E\033%-12345X"
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// #define TEST_TEXT_PAGE "\033@\033i\001\033X\001\060\000\r\nLUFA ESCP/2 Test Page\r\n"
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#define PAGE_SIZE (sizeof(TEST_TEXT_PAGE) - 1)
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char PCL_Test_Page[] = "\033%-12345X\033E LUFA PCL Test Page \033E\033%-12345X";
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// char ESCP2_Test_Page[] = "\033@\033i\001\033X\001\060\000\r\nLUFA ESCP/2 Test Page\r\n";
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Pipe_SelectPipe(PRINTER_DATA_OUT_PIPE);
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Pipe_Unfreeze();
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puts_P(PSTR("Waiting for Printer to Become Ready...\r\n"));
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while (!(Pipe_IsReadWriteAllowed()));
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printf_P(PSTR("Sending Test Page (%d bytes)...\r\n"), strlen(PCL_Test_Page));
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printf_P(PSTR("Printer Write Allowed, Sending Page (%d bytes)...\r\n"), PAGE_SIZE);
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Pipe_Write_Stream_LE(TEST_TEXT_PAGE, PAGE_SIZE);
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Pipe_ClearOUT();
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if ((ErrorCode = Printer_SendData(PCL_Test_Page)) != PIPE_RWSTREAM_NoError)
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{
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puts_P(PSTR("Error Sending Test Page.\r\n"));
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printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
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puts_P(PSTR("Page Sent, Waiting for Pipe...\r\n"));
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/* Indicate error via status LEDs */
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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while (!(Pipe_IsReadWriteAllowed()));
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Pipe_Freeze();
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/* Wait until USB device disconnected */
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USB_HostState = HOST_STATE_WaitForDeviceRemoval;
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break;
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}
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puts_P(PSTR("Pipe Frozen.\r\n"));
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//--------------------------------------------------------------
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puts_P(PSTR("Test Page Sent, Waiting for Pipe...\r\n"));
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/* Indicate device no longer busy */
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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@ -37,6 +37,7 @@
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#include <avr/pgmspace.h>
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#include <avr/power.h>
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#include <stdio.h>
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#include <string.h>
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#include "ConfigDescriptor.h"
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#include "Lib/PrinterCommands.h"
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