73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
#include <avr/interrupt.h>
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#include <avr/wdt.h>
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#include <util/delay.h>
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#include "usbdrv.h"
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//#include "io.h"
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//#include "pinport.h"
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//#include "buffer.h"
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int main(void)
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{
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//set watch dog timer with 1 second timer
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wdt_enable(WDTO_1S);
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/* Even if you don't use the watchdog, turn it off here. On newer devices,
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* the status of the watchdog (on/off, period) is PRESERVED OVER RESET!
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*/
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/* RESET status: all port bits are inputs without pull-up.
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* That's the way we need D+ and D-. Therefore we don't need any
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* additional hardware initialization.
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*/
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//odDebugInit(); //intialize debuging printing via serial port
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//DBG1(0x00, 0, 0); //debug serial op: main starts
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//initialize V-usb driver before interupts enabled and entering main loop
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usbInit();
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//disconnect from host enforce re-enumeration, interupts must be disabled during this.
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usbDeviceDisconnect();
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//fake USB disconnect for over 250ms
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uint8_t index = 0;
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while(--index){ //loop 256 times
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wdt_reset(); //keep wdt happy during this time
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_delay_ms(1); //delay 256msec
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}
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//reconnect to host
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usbDeviceConnect();
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//intialize i/o and LED to pullup state
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// io_reset();
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//enable interrupts
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sei();
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//=================
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//MAIN LOOP
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//=================
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while (1) {
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//pet the watch doggie to keep him happy
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wdt_reset();
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//must call at regular intervals no longer than 50msec
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//checks for setup packets from what I understand
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usbPoll();
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//check buffer status' and instruct them to
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//flash/dump as needed to keep data moving
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//currently assuming this operation doesn't take longer
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//than 50msec to meet usbPoll's req't
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//considering using a timer counter interupt to call
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//usbPoll more often but going to see how speed is
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//impacted first..
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//256Bytes * 20usec Tbp = 5.12msec programming time
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//+ cpu operations that can't be hid behind flash wait time
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//another thought would be to call usbPoll mid programming
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//a few times to prevent incoming data from being delayed too long
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// update_buffers();
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}
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}
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