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