o add gnususb as reference bootloader
o refactor boot loader cpde o
This commit is contained in:
David Voswinkel
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tools/gnusb/firmware/main.c
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200
tools/gnusb/firmware/main.c
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// ==============================================================================
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// main.c
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// firmware for a device based on the gnusb - OPEN SOURCE USB SENSOR BOX
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//
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// License:
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// The project is built with AVR USB driver by Objective Development, which is
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// published under an own licence based on the GNU General Public License (GPL).
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// gnusb is also distributed under this enhanced licence. See Documentation.
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//
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// target-cpu: ATMega16 @ 12MHz
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// created 2007-01-28 Michael Egger me@anyma.ch
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//
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// ==============================================================================
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#include "gnusb.h" // the gnusb library: setup and utility functions
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// ==============================================================================
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// Constants
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// ------------------------------------------------------------------------------
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#define ADC_PAUSE 10 // number of passes before we sample the next AD channel
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#define LED_KEEP_ALIVE 100 // number of passes before usb status led turns off
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#define USB_REPLY_PORTB 8 // Values of portb gets stored into 9th byte of usb_reply (counting from 0)
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#define USB_REPLY_PORTC 9
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// ==============================================================================
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// Globals
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// ------------------------------------------------------------------------------
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static u08 ad_mux; // current ad input channel
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static u16 ad_values[8]; // sampled ad input values
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static u08 ad_smoothing; // smoothing level of ad samples (0 - 15)
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static u08 ad_samplepause; // counts up to ADC_PAUSE between samples
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static u08 usb_reply[12]; // 8 bytes AD Values (8 most significant bits)
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// 1 byte PORTB
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// 1 byte PORTC
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// 2 bytes least significant bits of AD values
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// ------------------------------------------------------------------------------
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// - usbFunctionSetup
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// ------------------------------------------------------------------------------
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// this function gets called when the usb driver receives a non standard request
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// that is: our own requests defined in ../common/gnusb_cmds.h
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// here's where the magic happens...
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uchar usbFunctionSetup(uchar data[8])
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{
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switch (data[1]) {
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// ---------------------------- get all values
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case GNUSB_CMD_POLL:
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usbMsgPtr = usb_reply;
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return sizeof(usb_reply);
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break;
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// ---------------------------- set smoothing
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case GNUSB_CMD_SET_SMOOTHING:
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if (data[2] > 15) ad_smoothing = 15;
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else ad_smoothing = data[2];
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break;
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// ---------------------------- output one byte on PORTB
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case GNUSB_CMD_SET_PORTB:
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DDRB = 0xff; // set PORTB to output
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PORTB = data[2]; // output values
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usb_reply[USB_REPLY_PORTB] = data[2]; // mirror data in next poll
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break;
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// ---------------------------- output one byte on PORTC
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case GNUSB_CMD_SET_PORTC:
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DDRC = 0xff; // set PORTC to output
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PORTC = data[2]; // output values
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usb_reply[USB_REPLY_PORTC] = data[2]; // mirror data in next poll
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break;
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// ---------------------------- set PORTB to input
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case GNUSB_CMD_INPUT_PORTB:
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DDRB = 0x00;
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break;
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// ---------------------------- set PORTC to input
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case GNUSB_CMD_INPUT_PORTC:
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DDRC = 0x00;
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break;
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// ---------------------------- Start Bootloader for reprogramming the gnusb
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case GNUSB_CMD_START_BOOTLOADER:
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startBootloader();
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break;
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default:
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break;
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}
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return 0;
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}
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// ------------------------------------------------------------------------------
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// - Check ADC and update ad_values
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// ------------------------------------------------------------------------------
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void checkAnlogPorts (void) {
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unsigned int temp,replymask,replyshift,replybyte;
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if (ad_samplepause != 0xff) {
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if (ad_samplepause < ADC_PAUSE) {
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ad_samplepause++; // advance pause counter
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} else {
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ad_StartConversion(); // start a new conversion
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ad_samplepause = 0xff; // indicate we're waiting for a result now
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}
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} else {
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if ( ad_ConversionComplete() ) { // see if AD-Conversion is complete
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temp = ad_Read10bit(); // read ADC (10 bits);
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// basic low pass filter
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ad_values[ad_mux] = (ad_values[ad_mux] * ad_smoothing + temp) / (ad_smoothing + 1);
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usb_reply[ad_mux] = ad_values[ad_mux] >> 2; // copy 8 most significant bits to usb reply
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// if you don't need 10bit precision you can leave out the following stuff
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replybyte = 10 + (ad_mux / 4); // are we writing to byte 10 or 11?
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replyshift = ((ad_mux % 4) * 2); // how much to shift the bits
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replymask = (3 << replyshift); // create bitmask
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// write bits to the right place
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usb_reply[replybyte] =
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(usb_reply[replybyte] & ~replymask) | (replymask & (ad_values[ad_mux] << replyshift));
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ad_mux = (ad_mux + 1) % 8; // advance multiplexer index
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ad_SetChannel(ad_mux); // set mutliplexer channel
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ad_samplepause = 0; // start counting up to ADC_PAUSE in order to let the input settle a bit
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}
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}
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}
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// ------------------------------------------------------------------------------
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// - Check PORT B and PORT C
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// ------------------------------------------------------------------------------
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void checkDigitalPorts(void) {
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// copy state of pins to usb reply, only if the port is configured as an input
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if (DDRB == 0x00) usb_reply[USB_REPLY_PORTB] = PINB;
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if (DDRC == 0x00) usb_reply[USB_REPLY_PORTC] = PINC;
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}
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// ==============================================================================
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// - main
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// ------------------------------------------------------------------------------
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int main(void)
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{
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// ------------------------- Initialize Hardware
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// PORTA: AD Converter
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DDRA = 0x00; // set all pins to input
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PORTA = 0x00; // make sure pull-up resistors are turned off
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// PORTB: Default Input
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DDRB = 0x00; // set all pins to input
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PORTB = 0xff; // make sure pull-up resistors are turned ON
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// PORTC: Default output
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DDRC = 0xff; // set all pins to output
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PORTC = 0xff; // turn off all leds
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// PORTD: gnusbCore stuff: USB, status leds, jumper
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initCoreHardware();
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ledOn(STATUS_LED_GREEN);
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// ------------------------- Main Loop
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while(1) {
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wdt_reset(); // reset Watchdog timer - otherwise Watchdog will reset gnusb
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sleepIfIdle(); // go to low power mode if host computer is sleeping
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usbPoll(); // see if there's something going on on the usb bus
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checkAnlogPorts(); // see if we've finished an analog-digital conversion
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checkDigitalPorts(); // have a look at PORTB and PORTC
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}
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return 0;
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}
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