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81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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* Copyright 2007 Free Software Foundation, Inc.
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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 3 of the License, or
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* (at 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "i2c.h"
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#include "mdelay.h"
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#include "usrp2/fw_common.h"
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static const int EEPROM_PAGESIZE = 16;
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bool find_safe_booted_flag(void) {
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unsigned char flag_byte;
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eeprom_read(USRP2_I2C_ADDR_MBOARD, USRP2_EE_MBOARD_BOOTLOADER_FLAGS, &flag_byte, 1);
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return (flag_byte == 0x5E);
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}
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void set_safe_booted_flag(bool flag) {
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unsigned char flag_byte = flag ? 0x5E : 0xDC;
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eeprom_write(USRP2_I2C_ADDR_MBOARD, USRP2_EE_MBOARD_BOOTLOADER_FLAGS, &flag_byte, 1);
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}
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bool
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eeprom_write (int i2c_addr, int eeprom_offset, const void *buf, int len)
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{
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unsigned char cmd[2];
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const unsigned char *p = (unsigned char *) buf;
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// The simplest thing that could possibly work:
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// all writes are single byte writes.
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//
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// We could speed this up using the page write feature,
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// but we write so infrequently, why bother...
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while (len-- > 0){
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cmd[0] = eeprom_offset++;
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cmd[1] = *p++;
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bool r = i2c_write (i2c_addr, cmd, sizeof (cmd));
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mdelay (10); // delay 10ms worst case write time
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if (!r)
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return false;
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}
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return true;
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}
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bool
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eeprom_read (int i2c_addr, int eeprom_offset, void *buf, int len)
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{
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unsigned char *p = (unsigned char *) buf;
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// We setup a random read by first doing a "zero byte write".
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// Writes carry an address. Reads use an implicit address.
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unsigned char cmd[1];
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cmd[0] = eeprom_offset;
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if (!i2c_write (i2c_addr, cmd, sizeof (cmd)))
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return false;
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while (len > 0){
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// int n = std::min (len, MAX_EP0_PKTSIZE);
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int n = len;
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if (!i2c_read (i2c_addr, p, n))
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return false;
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len -= n;
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p += n;
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}
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return true;
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}
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