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ben-wpan/atusb-sil/fw/atusb/atusb.c
Werner Almesberger 2642b9e1c3 atusb-sil/: moved C8051F326-related material out of atusb/
- Makefile, atusb.pro, atusb.sch, atrf.sch, usb.sch, atusb.cmp, atusb.brd:
  resurrected from git history (commit
  14b00823b0)
- fw/: moved all C8051F326-specific files over from atusb/fw/
- fw/include/: copied MCU-independent files over from atusb/fw/include/
2011-02-22 00:17:13 -03:00

176 lines
3.0 KiB
C

/*
* atusb/atusb.c - ATUSB initialization and main loop
*
* Written 2008-2010 by Werner Almesberger
* Copyright 2008-2010 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include "regs.h"
#include "io.h"
#include "usb.h"
#include "atusb/ep0.h"
#include "version.h"
static int in_test_mode = 0;
static void set_test_mode(int on)
{
in_test_mode = on;
if (on) {
TST_MODE |= 1 << TST_BIT;
TST = 1;
LED_MODE |= 1 << LED_BIT;
} else {
TST = 0;
TST_MODE &= ~(1 << TST_BIT);
LED_MODE &= ~(1 << LED_BIT);
LED = 0;
}
}
void reset_rf(void)
{
int i;
set_test_mode(0);
nRST_RF = 0;
/*
* 11.4.12: min 625 ns.
* The pulse we generate is slightly longer than 4 us.
*/
for (i = 0; i != 10; i++);
nRST_RF = 1;
}
void test_mode(void)
{
set_test_mode(1);
}
/*
* The following macros set all unused pins on a given port to zero. This is
* more elaborate than just setting the ports directly, but it has the
* advantage of hiding the pin to port relation.
*/
#define PORT_NUM_P0 0
#define PORT_NUM_P2 2
#define PORT_NUM_P3 3
#define __PORT_NUM(mode) PORT_NUM_##mode
#define PORT_NUM(mode) __PORT_NUM(mode)
#define USED(port, net) (PORT_NUM(net##_PORT) == port ? 1 << net##_BIT : 0)
#define ZERO_UNUSED(port) \
P##port &= \
USED(port, LED) | \
USED(port, ID) | \
USED(port, MOSI) | \
USED(port, MISO) | \
USED(port, SCLK) | \
USED(port, nSS) | \
USED(port, nRST_RF) | \
USED(port, IRQ_RF) | \
USED(port, SLP_TR) | \
USED(port, TST)
static void init_io(void)
{
/*
* Signal Mode Value
*
* MOSI push-pull 0
* MISO open drain 1 (input)
* SCLK push-pull 0
* nSS push-pull 1
* nRST_RF push-pull 1
* IRQ_RF open drain 1 (input)
* SLP_TR push-pull 0
* TST open drain 0
*
* LED push-pull 0 (set up by boot loader)
*
* all unused open drain 0
*/
MOSI = 0;
MOSI_MODE |= 1 << MOSI_BIT;
SCLK = 0;
SCLK_MODE |= 1 << SCLK_BIT;
nSS_MODE |= 1 << nSS_BIT;
nRST_RF_MODE |= 1 << nRST_RF_BIT;
SLP_TR = 0;
SLP_TR_MODE |= 1 << SLP_TR_BIT;
IRQ_RF = 1;
LED = 0;
TST = 0;
ZERO_UNUSED(0);
ZERO_UNUSED(2);
ZERO_UNUSED(3);
#if 0
/*
* We can *almost* disable the pull-ups. The only obstacle is that
* MISO is not driven when not in use. So we either need an external
* pull-up/down or keep all the pull-ups on.
*/
/*
* Disable pull-ups
*/
GPIOCN |= WEAKPUD;
#endif
/*
* The manual says the reset is optional, but reality disagrees with
* this optimistic assessment quite violently.
*/
reset_rf();
}
void main(void)
{
int i;
init_io();
/*
* Make sure the host has enough time (2.5 us) to detect that we reset
* our USB stack.
*/
for (i = 0; i != 10; i++);
usb_init();
ep0_init();
while (1) {
if (in_test_mode) {
i++;
LED = !(i >> 11);
}
usb_poll();
}
}