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142 lines
2.3 KiB
C
142 lines
2.3 KiB
C
/*
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* atusb/atusb.c - ATUSB initialization and main loop
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*
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* Written 2008-2010 by Werner Almesberger
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* Copyright 2008-2010 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include "regs.h"
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#include "io.h"
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#include "usb.h"
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#include "atusb/ep0.h"
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#include "version.h"
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static int in_test_mode = 0;
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static void set_test_mode(int on)
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{
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in_test_mode = on;
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if (on) {
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TST_MODE |= 1 << TST_BIT;
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TST = 1;
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LED_MODE |= 1 << LED_BIT;
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} else {
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TST = 0;
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TST_MODE &= ~(1 << TST_BIT);
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LED_MODE &= ~(1 << LED_BIT);
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LED = 0;
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}
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}
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void reset_rf(void)
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{
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int i;
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set_test_mode(0);
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nRST_RF = 0;
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/*
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* 11.4.12: min 625 ns.
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* The pulse we generate is slightly longer than 4 us.
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*/
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for (i = 0; i != 10; i++);
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nRST_RF = 1;
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}
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void test_mode(void)
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{
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set_test_mode(1);
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}
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static void init_io(void)
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{
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/*
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* Signal Mode Value
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*
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* MOSI push-pull 0
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* MISO open drain 1 (input)
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* SCLK push-pull 0
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* nSS push-pull 1
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* nRST_RF push-pull 1
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* IRQ_RF open drain 1 (input)
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* SLP_TR push-pull 0
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* TST open drain 0
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*
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* LED push-pull 0 (set up by boot loader)
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*
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* all unused open drain 0
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*/
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MOSI = 0;
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MOSI_MODE |= 1 << MOSI_BIT;
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SCLK = 0;
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SCLK_MODE |= 1 << SCLK_BIT;
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nSS_MODE |= 1 << nSS_BIT;
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nRST_RF_MODE |= 1 << nRST_RF_BIT;
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SLP_TR = 0;
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SLP_TR_MODE |= 1 << SLP_TR_BIT;
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P0 = 1; /* IRQ_RF = 1; LED = 0; TST = Z; the rest is unused */
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P3 = 0;
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#if 0
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/*
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* We can *almost* disable the pull-ups. The only obstacle is that
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* MISO is not driven when not in use. So we either need an external
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* pull-up/down or keep all the pull-ups on.
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*/
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/*
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* Disable pull-ups
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*/
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GPIOCN |= WEAKPUD;
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#endif
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/*
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* The manual says the reset is optional, but reality disagrees with
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* this optimistic assessment quite violently.
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*/
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reset_rf();
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}
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void main(void)
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{
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int i;
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init_io();
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/*
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* Make sure the host has enough time (2.5 us) to detect that we reset
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* our USB stack.
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*/
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for (i = 0; i != 10; i++);
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usb_init();
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ep0_init();
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while (1) {
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if (in_test_mode) {
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i++;
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LED = !(i >> 11);
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}
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usb_poll();
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}
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}
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