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ben-wpan/atusb/fw/mac.c
Werner Almesberger eeeb5599f8 atusb/fw/mac.c: reserved code 0 and added notification of TX completion
- mac.c (queued_tx_ack, rx_done, handle_irq): on TX completion, send a
  a zero byte on EP 1
- mac.c (handle_irq): don't receive zero-sized frames (they're
  malformed anyway), so that size zero can be used to signal TX
  completion
2011-07-13 14:22:49 -03:00

170 lines
3.0 KiB
C

/*
* fw/mac.c - HardMAC functions
*
* Written 2011 by Werner Almesberger
* Copyright 2011 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 <stddef.h>
#include <stdint.h>
#include "usb.h"
#include "at86rf230.h"
#include "spi.h"
#include "board.h"
#include "mac.h"
int (*mac_irq)(void) = NULL;
static uint8_t rx_buf[MAX_PSDU+2]; /* PHDR+payload+LQ */
static uint8_t tx_buf[MAX_PSDU];
static uint8_t tx_size = 0;
static int txing = 0;
static int queued_tx_ack = 0;
static uint8_t reg_read(uint8_t reg)
{
uint8_t value;
spi_begin();
spi_send(AT86RF230_REG_READ | reg);
value= spi_recv();
spi_end();
return value;
}
static void reg_write(uint8_t reg, uint8_t value)
{
spi_begin();
spi_send(AT86RF230_REG_WRITE | reg);
spi_send(value);
spi_end();
}
static void rx_done(void *user)
{
led(0);
if (queued_tx_ack) {
usb_send(&eps[1], "", 1, rx_done, NULL);
queued_tx_ack = 0;
}
}
static int handle_irq(void)
{
uint8_t irq;
uint8_t size, i;
if (txing) {
if (eps[1].state == EP_IDLE)
usb_send(&eps[1], "", 1, rx_done, NULL);
else {
if (queued_tx_ack)
panic();
queued_tx_ack = 1;
}
txing = 0;
return 0;
}
irq = reg_read(REG_IRQ_STATUS);
if (!(irq & IRQ_TRX_END))
return 1;
/* unlikely */
if (eps[1].state != EP_IDLE)
return 1;
spi_begin();
spi_send(AT86RF230_BUF_READ);
size = spi_recv();
if (!size || (size & 0x80)) {
spi_end();
return 1;
}
rx_buf[0] = size;
for (i = 0; i != size+1; i++)
rx_buf[i+1] = spi_recv();
spi_end();
led(1);
usb_send(&eps[1], rx_buf, size+2, rx_done, NULL);
return 1;
}
int mac_rx(int on)
{
if (on) {
mac_irq = handle_irq;
reg_read(REG_IRQ_STATUS);
reg_write(REG_TRX_STATE, TRX_CMD_RX_ON);
} else {
mac_irq = NULL;
reg_write(REG_TRX_STATE, TRX_CMD_FORCE_TRX_OFF);
txing = 0;
}
return 1;
}
static void do_tx(void *user)
{
uint8_t status;
uint8_t i;
do status = reg_read(REG_TRX_STATUS) & TRX_STATUS_MASK;
while (status != TRX_STATUS_RX_ON && status != TRX_STATUS_RX_AACK_ON);
/*
* We use TRX_CMD_FORCE_PLL_ON instead of TRX_CMD_PLL_ON because a new
* reception may have begun while we were still working on the previous
* one.
*/
reg_write(REG_TRX_STATE, TRX_CMD_FORCE_PLL_ON);
handle_irq();
spi_begin();
spi_send(AT86RF230_BUF_WRITE);
spi_send(tx_size+2); /* CRC */
for (i = 0; i != tx_size; i++)
spi_send(tx_buf[i]);
spi_end();
reg_write(REG_TRX_STATE, TRX_CMD_TX_START);
txing = 1;
/*
* Wait until we reach BUSY_TX, so that we command the transition to
* RX_ON which will be executed upon TX completion.
*/
while ((reg_read(REG_TRX_STATUS) & TRX_STATUS_MASK) ==
TRX_STATUS_TRANSITION);
reg_write(REG_TRX_STATE, TRX_CMD_RX_ON);
}
int mac_tx(uint16_t flags, uint16_t len)
{
if (len > MAX_PSDU)
return 0;
tx_size = len;
usb_recv(&eps[0], tx_buf, len, do_tx, NULL);
return 1;
}