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Diffstat (limited to 'examples/hid-data/firmware/main.c')
| -rw-r--r-- | examples/hid-data/firmware/main.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/examples/hid-data/firmware/main.c b/examples/hid-data/firmware/main.c new file mode 100644 index 0000000..3ef68d5 --- /dev/null +++ b/examples/hid-data/firmware/main.c @@ -0,0 +1,141 @@ +/* Name: main.c + * Project: hid-data, example how to use HID for data transfer + * Author: Christian Starkjohann + * Creation Date: 2008-04-11 + * Tabsize: 4 + * Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt) or proprietary (CommercialLicense.txt) + * This Revision: $Id$ + */ + +/* +This example should run on most AVRs with only little changes. No special +hardware resources except INT0 are used. You may have to change usbconfig.h for +different I/O pins for USB. Please note that USB D+ must be the INT0 pin, or +at least be connected to INT0 as well. +*/ + +#include <avr/io.h> +#include <avr/wdt.h> +#include <avr/interrupt.h> /* for sei() */ +#include <util/delay.h> /* for _delay_ms() */ +#include <avr/eeprom.h> + +#include <avr/pgmspace.h> /* required by usbdrv.h */ +#include "usbdrv.h" +#include "oddebug.h" /* This is also an example for using debug macros */ + +/* ------------------------------------------------------------------------- */ +/* ----------------------------- USB interface ----------------------------- */ +/* ------------------------------------------------------------------------- */ + +PROGMEM char usbHidReportDescriptor[22] = { /* USB report descriptor */ + 0x06, 0x00, 0xff, // USAGE_PAGE (Generic Desktop) + 0x09, 0x01, // USAGE (Vendor Usage 1) + 0xa1, 0x01, // COLLECTION (Application) + 0x15, 0x00, // LOGICAL_MINIMUM (0) + 0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255) + 0x75, 0x08, // REPORT_SIZE (8) + 0x95, 0x80, // REPORT_COUNT (128) + 0x09, 0x00, // USAGE (Undefined) + 0xb2, 0x02, 0x01, // FEATURE (Data,Var,Abs,Buf) + 0xc0 // END_COLLECTION +}; +/* Since we define only one feature report, we don't use report-IDs (which + * would be the first byte of the report). The entire report consists of 128 + * opaque data bytes. + */ + +/* The following variables store the status of the current data transfer */ +static uchar currentAddress; +static uchar bytesRemaining; + +/* ------------------------------------------------------------------------- */ + +/* usbFunctionRead() is called when the host requests a chunk of data from + * the device. For more information see the documentation in usbdrv/usbdrv.h. + */ +uchar usbFunctionRead(uchar *data, uchar len) +{ + if(len > bytesRemaining) + len = bytesRemaining; + eeprom_read_block(data, (uchar *)0 + currentAddress, len); + currentAddress += len; + bytesRemaining -= len; + return len; +} + +/* usbFunctionWrite() is called when the host sends a chunk of data to the + * device. For more information see the documentation in usbdrv/usbdrv.h. + */ +uchar usbFunctionWrite(uchar *data, uchar len) +{ + if(bytesRemaining == 0) + return 1; /* end of transfer */ + if(len > bytesRemaining) + len = bytesRemaining; + eeprom_write_block(data, (uchar *)0 + currentAddress, len); + currentAddress += len; + bytesRemaining -= len; + return bytesRemaining == 0; /* return 1 if this was the last chunk */ +} + +/* ------------------------------------------------------------------------- */ + +uchar usbFunctionSetup(uchar data[8]) +{ +usbRequest_t *rq = (void *)data; + + if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){ /* HID class request */ + if(rq->bRequest == USBRQ_HID_GET_REPORT){ /* wValue: ReportType (highbyte), ReportID (lowbyte) */ + /* since we have only one report type, we can ignore the report-ID */ + bytesRemaining = 128; + currentAddress = 0; + return 0xff; /* use usbFunctionRead() to obtain data */ + }else if(rq->bRequest == USBRQ_HID_SET_REPORT){ + /* since we have only one report type, we can ignore the report-ID */ + bytesRemaining = 128; + currentAddress = 0; + return 0xff; /* use usbFunctionWrite() to receive data from host */ + } + }else{ + /* ignore vendor type requests, we don't use any */ + } + return 0; +} + +/* ------------------------------------------------------------------------- */ + +int main(void) +{ +uchar i; + + wdt_enable(WDTO_1S); + /* Even if you don't use the watchdog, turn it off here. On newer devices, + * the status of the watchdog (on/off, period) is PRESERVED OVER RESET! + */ + DBG1(0x00, 0, 0); /* debug output: main starts */ + /* RESET status: all port bits are inputs without pull-up. + * That's the way we need D+ and D-. Therefore we don't need any + * additional hardware initialization. + */ + odDebugInit(); + usbInit(); + usbDeviceDisconnect(); /* enforce re-enumeration, do this while interrupts are disabled! */ + i = 0; + while(--i){ /* fake USB disconnect for > 250 ms */ + wdt_reset(); + _delay_ms(1); + } + usbDeviceConnect(); + sei(); + DBG1(0x01, 0, 0); /* debug output: main loop starts */ + for(;;){ /* main event loop */ + DBG1(0x02, 0, 0); /* debug output: main loop iterates */ + wdt_reset(); + usbPoll(); + } + return 0; +} + +/* ------------------------------------------------------------------------- */ |