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dgisselq |
///////////////////////////////////////////////////////////////////////////
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//
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//
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// Filename: sdspisim.cpp
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//
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// Project: Wishbone Controlled SD-Card Controller over SPI port
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//
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// Purpose: This library simulates the operation of a SPI commanded SD-Card,
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// such as might be found on a XuLA2-LX25 board made by xess.com.
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//
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// This simulator is for testing use in a Verilator/C++ environment, where
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// it would be used in place of the actual hardware.
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//
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// Creator: Dan Gisselquist
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// Gisselquist Technology, LLC
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//
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///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2015-2016, Gisselquist Technology, LLC
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//
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. (It's in the $(ROOT)/doc directory, run make with no
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// target there if the PDF file isn't present.) If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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//
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//
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///////////////////////////////////////////////////////////////////////////
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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#include "sdspisim.h"
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static const unsigned
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MICROSECONDS = 80, // Clocks in a microsecond
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MILLISECONDS = MICROSECONDS * 1000,
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tRESET = 4*MILLISECONDS; // Just a wild guess
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/*
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static const unsigned DEVID = 0x0115,
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DEVESD = 0x014,
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MICROSECONDS = 100,
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MILLISECONDS = MICROSECONDS * 1000,
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SECONDS = MILLISECONDS * 1000,
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tW = 50 * MICROSECONDS, // write config cycle time
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tBE = 32 * SECONDS,
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tDP = 10 * SECONDS,
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tRES = 30 * SECONDS,
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// Shall we artificially speed up this process?
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tPP = 12 * MICROSECONDS,
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tSE = 15 * MILLISECONDS;
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// or keep it at the original speed
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// tPP = 1200 * MICROSECONDS,
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// tSE = 1500 * MILLISECONDS;
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*/
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static const unsigned
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CCS = 1; // 0: SDSC card, 1: SDHC or SDXC card
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SDSPISIM::SDSPISIM(const bool debug) {
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m_dev = NULL;
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m_last_sck = 1;
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m_block_address = (CCS==1);
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m_host_supports_high_capacity = false;
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m_powerup_busy = -1;
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m_reset_state = SDSPI_POWERUP_RESET;
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//
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m_csd[ 0] = 0; // Normal SDcard, not high capacity
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m_csd[ 1] = 0x0f;
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m_csd[ 2] = 0x0f;
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m_csd[ 3] = 0x32; // Can be either 0x32 (25MHz) or 0x5a (50MHz)
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m_csd[ 4] = 0x5b; // Could also be 0x07b, if we supported more comands(?)
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m_csd[ 5] = 0x59; // 9-> 2^9,or 512 bytes (10->1024, 11->2048, no othrs)
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m_csd[ 6] = 0x00; // partial blocks allowed?
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m_csd[ 7] = 0x00; // C_SIZE, 2'b00, then top 6 bits
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m_csd[ 8] = 0; // C_SIZE, 22-bits, mid 8 bits
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m_csd[ 9] = 0; // C_SIZE, 22-bits, bottom 8 bits
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m_csd[10] = 0x7f;
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m_csd[11] = 0x80;
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m_csd[12] = 0x0a;
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m_csd[13] = 0x40;
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m_csd[14] = 0; // R/W: file format, copy, write protect, etc.
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m_csd[15] = cmdcrc(15, m_csd);
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// CID Register
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m_cid[ 0] = 0xba;
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m_cid[ 1] = 0xd0;
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m_cid[ 2] = 0xda;
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m_cid[ 3] = 0xdd;
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m_cid[ 4] = 0;
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m_cid[ 5] = 0xde;
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m_cid[ 6] = 0xad;
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m_cid[ 7] = 0xbe;
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m_cid[ 8] = 0xef;
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m_cid[ 9] = 0x20;
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m_cid[10] = 0x16;
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m_cid[11] = 0x05;
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m_cid[12] = 0x26;
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m_cid[13] = 0;
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m_cid[14] = 0;
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m_cid[15] = cmdcrc(15, m_cid);
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// m_write_count = 0;
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// m_ireg = m_oreg = 0;
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// m_sreg = 0x01c;
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// m_creg = 0x001; // Iinitial creg on delivery
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//
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m_reading_data = false;
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m_have_token = false;
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m_debug = debug;
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}
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void SDSPISIM::load(const char *fname) {
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m_dev = fopen(fname, "r+b");
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if (m_dev) {
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unsigned long devln;
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fseek(m_dev, 0l, SEEK_END);
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devln = ftell(m_dev);
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fseek(m_dev, 0l, SEEK_SET);
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m_devblocks = devln>>9;
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if (m_debug) printf("SDCARD: NBLOCKS = %ld\n", m_devblocks);
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}
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}
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int SDSPISIM::operator()(const int csn, const int sck, const int mosi) {
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// Keep track of a timer to determine when page program and erase
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// cycles complete.
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/*
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if (m_write_count > 0) {
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//
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}
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*/
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m_delay++;
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if (m_powerup_busy>0)
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m_powerup_busy--;
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if (csn) {
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m_delay = 0;
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m_cmdidx= 0;
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m_rspidx= 0;
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m_bitpos= 0;
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m_delay = 0;
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m_busy = false;
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m_last_sck = sck;
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m_syncd = false;
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m_last_miso = 1;
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m_dat_out = 0x0ff;
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// Reset everything when not selected
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return 0;
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} else if (sck == m_last_sck) {
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m_last_sck = sck;
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return m_last_miso;
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} else if (!m_last_sck) {
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// Register our input on the rising edge
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m_mosi = mosi;
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m_syncd= true;
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m_last_sck = sck;
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return m_last_miso;
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} if (!m_syncd) {
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m_last_sck = sck;
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return m_last_miso;
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}
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// Only change our output on the falling edge
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m_last_sck = sck;
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if (m_debug) printf("SDSPI: (%3d) [%d,%d,%d] ", m_delay, csn, sck, m_mosi);
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// assert(m_delay > 20);
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m_bitpos++;
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m_dat_in = (m_dat_in<<1)|m_mosi;
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if (m_debug) printf("(bitpos=%d,dat_in=%02x)\n", m_bitpos&7, m_dat_in&0x0ff);
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if ((m_bitpos&7)==0) {
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if (m_debug) printf("SDSPI--RX BYTE %02x\n", m_dat_in&0x0ff);
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m_dat_out = 0xff;
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if (m_reading_data) {
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if (m_have_token) {
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m_block_buf[m_rxloc++] = m_dat_in;
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if (m_debug) printf("SDSPI: WR[%3d] = %02x\n", m_rxloc-1,
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m_dat_in&0x0ff);
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if (m_rxloc >= 512+2) {
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unsigned crc, rxcrc;
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crc = blockcrc(512, m_block_buf);
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rxcrc = ((m_block_buf[512]&0x0ff)<<8)
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|(m_block_buf[513]&0x0ff);
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if (m_debug) printf("LEN = %d\n", m_rxloc);
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if (m_debug) printf("CHECKING CRC: (rx) %04x =? %04x (calc)\n",
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crc, rxcrc);
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m_reading_data = false;
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m_have_token = false;
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if (rxcrc == crc)
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m_dat_out = 5;
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else {
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m_dat_out = 0x0b;
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assert(rxcrc == crc);
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}
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}
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} else {
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if ((m_dat_in&0x0ff) == 0x0fe) {
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if (m_debug) printf("SDSPI: TOKEN!!\n");
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m_have_token = true;
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m_rxloc = 0;
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} else if (m_debug)
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printf("SDSPI: waiting on token\n");
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}
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} else if (m_cmdidx < 6) {
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if (m_debug) printf("SDSPI: CMDIDX = %d\n", m_cmdidx);
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// All commands *must* start with a 01... pair of bits.
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if (m_cmdidx == 0)
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assert((m_dat_in&0xc0)==0x40);
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// Record the command for later processing
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m_cmdbuf[m_cmdidx++] = m_dat_in;
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} else if (m_cmdidx == 6) {
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// We're going to start a response from here ...
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m_rspidx = 0;
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m_blkdly = 0;
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m_blkidx = SDSPI_MAXBLKLEN;
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if (m_debug) {
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printf("SDSPI: CMDIDX = %d -- WE HAVE A COMMAND! [ ", m_cmdidx);
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for(int i=0; i<6; i++)
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printf("%02x ", m_cmdbuf[i] & 0xff);
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printf("]\n"); fflush(stdout);
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}
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unsigned arg;
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arg = ((((((m_cmdbuf[1]<<8)|(m_cmdbuf[2]&0x0ff))<<8)
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|(m_cmdbuf[3]&0x0ff))<<8)
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|(m_cmdbuf[4]&0x0ff));
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arg &= 0x0ffffffff;
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// Check the CRC
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if (!check_cmdcrc(m_cmdbuf)) {
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assert(0 && "BAD CRC");
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m_rspbuf[0] = 0x09;
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m_rspdly = 1;
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} else if (m_altcmd_flag) {
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switch(m_cmdbuf[0]&0x03f) {
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case 41: // ACMD41 -- SD_SEND_OP_COND
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// and start initialization sequence
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assert((m_reset_state == SDSPI_RCVD_CMD8)||(m_reset_state == SDSPI_RCVD_ACMD41)||(m_reset_state == SDSPI_RESET_COMPLETE));
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if((unsigned)m_powerup_busy>tRESET)
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m_powerup_busy = tRESET;
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assert((arg&0x0bfffffff) == 0);
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m_rspbuf[0] = (m_powerup_busy)?1:0;
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m_rspdly = 2;
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m_host_supports_high_capacity = (m_cmdbuf[1]&0x40)?1:0;
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m_reset_state = (m_powerup_busy)?
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SDSPI_RCVD_ACMD41
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:SDSPI_RESET_COMPLETE;
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break;
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case 51: // ACMD51
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m_block_buf[0] = 0x0fe;
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for(int j=0; j<8; j++)
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m_block_buf[j+1] = m_csd[j];
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m_blklen = 8;
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add_block_crc(m_blklen, m_block_buf);
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| 281 |
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| 282 |
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m_blkdly = 0;
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m_blkidx = 0;
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| 284 |
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m_dat_out = 0;
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| 285 |
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break;
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| 286 |
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case 13: // ACMD13
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case 22: // ACMD22
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| 288 |
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case 23: // ACMD23
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case 42: // ACMD42
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default: // Unimplemented command!
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m_rspbuf[0] = 0x04;
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m_rspdly = 4;
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fprintf(stderr, "SDSPI ERR: Alt command ACMD%d not implemented!\n", m_cmdbuf[0]&0x03f);
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assert(0 && "Not Implemented");
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} m_altcmd_flag = false;
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} else {
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| 297 |
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m_altcmd_flag = false;
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| 298 |
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memset(m_rspbuf, 0x0ff, SDSPI_RSPLEN);
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| 299 |
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if (m_debug) printf("SDSPI: Received a command 0x%02x (%d)\n",
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m_cmdbuf[0], m_cmdbuf[0]&0x03f);
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switch(m_cmdbuf[0]&0x3f) {
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case 0: // CMD0 -- GO_IDLE_STATE
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m_rspbuf[0] = 0x01;
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m_rspdly = 4;
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m_reset_state = SDSPI_CMD0_IDLE;
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| 306 |
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break;
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| 307 |
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case 1: // CMD1 -- SEND_OP_COND
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assert((arg&0x0bfffffff) == 0);
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| 309 |
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m_rspbuf[0] = 0x02;
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| 310 |
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m_rspdly = 4;
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| 311 |
|
|
m_host_supports_high_capacity = (m_cmdbuf[1]&0x40)?1:0;
|
| 312 |
|
|
break;
|
| 313 |
|
|
case 8: // CMD8 -- SEND_IF_COND
|
| 314 |
|
|
assert((arg&0x0fffff000) == 0);
|
| 315 |
|
|
m_rspbuf[0] = 0x00;
|
| 316 |
|
|
// See p82 for this format
|
| 317 |
|
|
m_rspbuf[1] = 0;
|
| 318 |
|
|
m_rspbuf[2] = 0;
|
| 319 |
|
|
// If we do not accept the voltage range
|
| 320 |
|
|
m_rspbuf[3] = 0;
|
| 321 |
|
|
// Now, check if we accept it
|
| 322 |
|
|
// We only accept 2.7-3.6V in this
|
| 323 |
|
|
// simulation.
|
| 324 |
|
|
if ((arg&0x0f00)==0x0100)
|
| 325 |
|
|
m_rspbuf[3] = 1;
|
| 326 |
|
|
m_rspbuf[4] = (char)(arg&0x0ff);
|
| 327 |
|
|
m_rspdly = 4;
|
| 328 |
|
|
assert((m_reset_state == SDSPI_CMD0_IDLE)||(m_reset_state == SDSPI_RCVD_CMD8));
|
| 329 |
|
|
m_reset_state = SDSPI_RCVD_CMD8;
|
| 330 |
|
|
break;
|
| 331 |
|
|
case 9: // CMD9 -- SEND_CSD
|
| 332 |
|
|
// Block read, returning start token,
|
| 333 |
|
|
// 16 bytes, then 2 crc bytes
|
| 334 |
|
|
assert(m_reset_state == SDSPI_IN_OPERATION);
|
| 335 |
|
|
m_rspbuf[0] = 0x00;
|
| 336 |
|
|
memset(m_block_buf, 0x0ff, SDSPI_MAXBLKLEN);
|
| 337 |
|
|
m_block_buf[0] = 0x0fe;
|
| 338 |
|
|
for(int j=0; j<16; j++)
|
| 339 |
|
|
m_block_buf[j+1] = m_csd[j];
|
| 340 |
|
|
m_blklen = 16;
|
| 341 |
|
|
add_block_crc(m_blklen, m_block_buf);
|
| 342 |
|
|
|
| 343 |
|
|
m_blkdly = 60;
|
| 344 |
|
|
m_blkidx = 0;
|
| 345 |
|
|
break;
|
| 346 |
|
|
case 10: // CMD10 -- SEND_CID
|
| 347 |
|
|
// Block read, returning start token,
|
| 348 |
|
|
// 16 bytes, then 2 crc bytes
|
| 349 |
|
|
assert(m_reset_state == SDSPI_IN_OPERATION);
|
| 350 |
|
|
m_rspbuf[0] = 0x00;
|
| 351 |
|
|
memset(m_block_buf, 0x0ff, SDSPI_MAXBLKLEN);
|
| 352 |
|
|
m_block_buf[0] = 0x0fe;
|
| 353 |
|
|
for(int j=0; j<16; j++)
|
| 354 |
|
|
m_block_buf[j+1] = m_cid[j];
|
| 355 |
|
|
m_blklen = 16;
|
| 356 |
|
|
add_block_crc(m_blklen, m_block_buf);
|
| 357 |
|
|
|
| 358 |
|
|
m_blkdly = 60;
|
| 359 |
|
|
m_blkidx = 0;
|
| 360 |
|
|
break;
|
| 361 |
|
|
case 13: // CMD13 -- SEND_STATUS
|
| 362 |
|
|
assert(m_reset_state == SDSPI_IN_OPERATION);
|
| 363 |
|
|
m_rspbuf[0] = 0x00;
|
| 364 |
|
|
m_rspbuf[1] = 0x00;
|
| 365 |
|
|
// if (m_wp_fault) m_rspbuf[1]|=0x20;
|
| 366 |
|
|
// if (m_err) m_rspbuf[1]|=0x04;
|
| 367 |
|
|
m_rspdly = 4;
|
| 368 |
|
|
break;
|
| 369 |
|
|
case 17: // CMD17 -- READ_SINGLE_BLOCK
|
| 370 |
|
|
assert(m_reset_state == SDSPI_IN_OPERATION);
|
| 371 |
|
|
m_rspbuf[0] = 0x00;
|
| 372 |
|
|
memset(m_block_buf, 0x0ff, SDSPI_MAXBLKLEN);
|
| 373 |
|
|
if (m_dev) {
|
| 374 |
|
|
if (m_debug) printf("Reading from block %08x of %08lx\n", arg, m_devblocks);
|
| 375 |
|
|
if (m_block_address) {
|
| 376 |
|
|
assert(arg < m_devblocks);
|
| 377 |
|
|
fseek(m_dev, arg<<9, SEEK_SET);
|
| 378 |
|
|
} else {
|
| 379 |
|
|
assert(arg < m_devblocks<<9);
|
| 380 |
|
|
fseek(m_dev, arg, SEEK_SET);
|
| 381 |
|
|
}
|
| 382 |
|
|
} m_block_buf[0] = 0x0fe;
|
| 383 |
|
|
m_blklen = 512; // (1<<m_csd[5]);
|
| 384 |
|
|
if (m_dev)
|
| 385 |
|
|
m_blklen = fread(&m_block_buf[1], m_blklen, 1, m_dev);
|
| 386 |
|
|
else
|
| 387 |
|
|
memset(&m_block_buf[1], 0, m_blklen);
|
| 388 |
|
|
m_blklen = (m_blklen != 512) ? 512 : m_blklen;
|
| 389 |
|
|
add_block_crc(m_blklen, m_block_buf);
|
| 390 |
|
|
|
| 391 |
|
|
m_blkdly = 60;
|
| 392 |
|
|
m_blkidx = 0;
|
| 393 |
|
|
break;
|
| 394 |
|
|
case 24: // CMD24 -- WRITE_BLOCK
|
| 395 |
|
|
m_reading_data = true;
|
| 396 |
|
|
m_have_token = false;
|
| 397 |
|
|
m_dat_out = 0;
|
| 398 |
|
|
break;
|
| 399 |
|
|
case 55: // CMD55 -- APP_CMD
|
| 400 |
|
|
m_rspbuf[0] = 0x00;
|
| 401 |
|
|
m_rspdly = 2;
|
| 402 |
|
|
m_altcmd_flag = true;
|
| 403 |
|
|
break;
|
| 404 |
|
|
case 58: // CMD58 -- READ_OCR, respond R7
|
| 405 |
|
|
// argument is stuff bits/dont care
|
| 406 |
|
|
m_rspbuf[0] = 0x00;
|
| 407 |
|
|
// See p112, Tbl 5-1 for this format
|
| 408 |
|
|
m_rspbuf[1] = ((m_powerup_busy)?0x80:0)
|
| 409 |
|
|
|(CCS?0x40:0);
|
| 410 |
|
|
m_rspbuf[2] = 0xff;// 2.7-3.6V supported
|
| 411 |
|
|
m_rspbuf[3] = 0x80;
|
| 412 |
|
|
m_rspbuf[4] = 0; // No low-voltage supt
|
| 413 |
|
|
m_rspdly = 4;
|
| 414 |
|
|
|
| 415 |
|
|
if (m_reset_state == SDSPI_RESET_COMPLETE)
|
| 416 |
|
|
m_reset_state = SDSPI_IN_OPERATION;
|
| 417 |
|
|
break;
|
| 418 |
|
|
case 6: // CMD6 -- SWITCH_FUNC
|
| 419 |
|
|
case 12: // CMD12 -- STOP_TRANSMISSION (!impl)
|
| 420 |
|
|
case 16: // CMD16 -- SET_BLOCKLEN
|
| 421 |
|
|
case 18: // CMD18 -- READ_MULTIPLE_BLOCK
|
| 422 |
|
|
case 25: // CMD25 -- WRITE_MULTIPLE_BLOCK
|
| 423 |
|
|
case 27: // CMD27 -- PROGRAM_CSD
|
| 424 |
|
|
case 32: // CMD32 -- ERASE_WR_BLK_START_ADDR
|
| 425 |
|
|
case 33: // CMD33 -- ERASE_WR_BLK_END_ADDR
|
| 426 |
|
|
case 38: // CMD38 -- ERASE
|
| 427 |
|
|
case 56: // CMD56 -- GEN_CMD
|
| 428 |
|
|
default: // Unimplemented command
|
| 429 |
|
|
m_rspbuf[0] = 0x04;
|
| 430 |
|
|
m_rspdly = 4;
|
| 431 |
|
|
if (m_debug) printf("SDSPI ERR: Command CMD%d not implemented!\n", m_cmdbuf[0]&0x03f);
|
| 432 |
|
|
fflush(stdout);
|
| 433 |
|
|
assert(0 && "Not Implemented");
|
| 434 |
|
|
}
|
| 435 |
|
|
} m_cmdidx++;
|
| 436 |
|
|
|
| 437 |
|
|
// If we are using blocks, add bytes for the start
|
| 438 |
|
|
// token and the two CRC bytes
|
| 439 |
|
|
m_blklen += 3;
|
| 440 |
|
|
} else if (m_rspdly > 0) {
|
| 441 |
|
|
assert((m_dat_in&0x0ff) == 0x0ff);
|
| 442 |
|
|
// A delay until a response is given
|
| 443 |
|
|
if (m_busy)
|
| 444 |
|
|
m_dat_out = 0;
|
| 445 |
|
|
m_rspdly--;
|
| 446 |
|
|
} else if (m_rspidx < SDSPI_RSPLEN) {
|
| 447 |
|
|
assert((m_dat_in&0x0ff) == 0x0ff);
|
| 448 |
|
|
m_dat_out = m_rspbuf[m_rspidx++];
|
| 449 |
|
|
} else if (m_blkdly > 0) {
|
| 450 |
|
|
assert((m_dat_in&0x0ff) == 0x0ff);
|
| 451 |
|
|
m_blkdly--;
|
| 452 |
|
|
} else if (m_blkidx < SDSPI_MAXBLKLEN) {
|
| 453 |
|
|
assert((m_dat_in&0x0ff) == 0x0ff);
|
| 454 |
|
|
m_dat_out = m_block_buf[m_blkidx++];
|
| 455 |
|
|
}
|
| 456 |
|
|
// else m_dat_out = 0x0ff; // So set already above
|
| 457 |
|
|
}
|
| 458 |
|
|
|
| 459 |
|
|
int result = (m_dat_out&0x80)?1:0;
|
| 460 |
|
|
m_dat_out <<= 1;
|
| 461 |
|
|
m_delay = 0;
|
| 462 |
|
|
m_last_miso = result;
|
| 463 |
|
|
fflush(stdout);
|
| 464 |
|
|
return result;
|
| 465 |
|
|
}
|
| 466 |
|
|
|
| 467 |
|
|
unsigned SDSPISIM::cmdcrc(int len, char *buf) const {
|
| 468 |
|
|
unsigned int fill = 0, taps = 0x12;
|
| 469 |
|
|
|
| 470 |
|
|
for(int i=0; i<len; i++) {
|
| 471 |
|
|
fill ^= buf[i];
|
| 472 |
|
|
for(int j=0; j<8; j++) {
|
| 473 |
|
|
if (fill&0x80)
|
| 474 |
|
|
fill = (fill<<1)^taps;
|
| 475 |
|
|
else
|
| 476 |
|
|
fill <<= 1;
|
| 477 |
|
|
}
|
| 478 |
|
|
}
|
| 479 |
|
|
|
| 480 |
|
|
fill &= 0x0fe; fill |= 1;
|
| 481 |
|
|
return fill;
|
| 482 |
|
|
}
|
| 483 |
|
|
|
| 484 |
|
|
bool SDSPISIM::check_cmdcrc(char *buf) const {
|
| 485 |
|
|
unsigned fill = cmdcrc(5, buf);
|
| 486 |
|
|
if (m_debug) printf("SDSPI: CRC-CHECK, should have a CRC of %02x\n", fill);
|
| 487 |
|
|
return (fill == (buf[5]&0x0ff));
|
| 488 |
|
|
}
|
| 489 |
|
|
|
| 490 |
|
|
unsigned SDSPISIM::blockcrc(int len, char *buf) const {
|
| 491 |
|
|
unsigned int fill = 0, taps = 0x1021;
|
| 492 |
|
|
bool dbg = (len == 512);
|
| 493 |
|
|
|
| 494 |
|
|
for(int i=0; i<len; i++) {
|
| 495 |
|
|
if (dbg) { printf("BUF[%3d] = %02x\n", i, buf[i]&0x0ff); }
|
| 496 |
|
|
fill ^= ((buf[i]&0x0ff) << 8);
|
| 497 |
|
|
for(int j=0; j<8; j++) {
|
| 498 |
|
|
if (fill&0x8000)
|
| 499 |
|
|
fill = (fill<<1)^taps;
|
| 500 |
|
|
else
|
| 501 |
|
|
fill <<= 1;
|
| 502 |
|
|
}
|
| 503 |
|
|
}
|
| 504 |
|
|
|
| 505 |
|
|
fill &= 0x0ffff;
|
| 506 |
|
|
if (dbg) { printf("BLOCKCRC(%d,...) = %04x\n", len, fill); }
|
| 507 |
|
|
return fill;
|
| 508 |
|
|
}
|
| 509 |
|
|
|
| 510 |
|
|
void SDSPISIM::add_block_crc(int len, char *buf) const {
|
| 511 |
|
|
unsigned fill = blockcrc(len, &buf[1]);
|
| 512 |
|
|
|
| 513 |
|
|
buf[len+1] = (fill >> 8)&0x0ff;
|
| 514 |
|
|
buf[len+2] = (fill )&0x0ff;
|
| 515 |
|
|
}
|
| 516 |
|
|
|
