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- /*
- * mem.c
- *
- * Copyright 2011 Thomas Buck <xythobuz@me.com>
- * Copyright 2011 Max Nuding <max.nuding@gmail.com>
- * Copyright 2011 Felix Bäder <baeder.felix@gmail.com>
- *
- * This file is part of LED-Cube.
- *
- * LED-Cube 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 3 of the License, or
- * (at your option) any later version.
- *
- * LED-Cube is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with LED-Cube. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include <avr/io.h>
- #include <stdlib.h>
- #include <stdint.h>
- #include "twi.h"
- #include "mem.h"
- #ifdef DEBUG
- #include "serial.h"
- #include "strings.h"
- #endif
-
- // address is a number between (inclusive) zero and 131071
- uint8_t memGetByte(uint32_t address) {
- uint8_t addA, addB, memAddress = MEMTWIADDRESS, ret;
- if (address >= 65536) {
- // Address needs more than 16 bits, we have to set the PAGE bit in i2c address
- memAddress |= 2;
- }
- addA = address & 0xFF00;
- addB = address & 0xFF;
-
- if (i2c_start(memAddress | I2C_WRITE) == 0) { // Send start, write address to read
- i2c_write(addA);
- i2c_write(addB); // Give address to memory
- i2c_rep_start(memAddress | I2C_READ); // Start again, this time reading
- ret = i2c_readNak(); // Read one byte from memory
- i2c_stop();
- return ret;
- } else {
- return 0;
- }
- }
-
- // Free returned memory!
- uint8_t *memGetBytes(uint32_t address, uint8_t length) {
- // We could use the High-Speed Mode of the FM24V10 here, but we don't, right now...
- uint8_t addA, addB, memAddress = MEMTWIADDRESS, i, *ret;
- if (address >= 65536) {
- // Address needs more than 16 bits, we have to set the PAGE bit in i2c address
- memAddress |= 2;
- }
- addA = address & 0xFF00;
- addB = address & 0xFF;
- ret = (uint8_t *)malloc(length); // Allocate memory for values read
- if (ret == NULL) {
- #ifdef DEBUG
- serialWriteString(getString(24));
- #endif
- return NULL;
- }
-
- if (i2c_start(memAddress | I2C_WRITE) == 0) {
- i2c_write(addA);
- i2c_write(addB);
- i2c_rep_start(memAddress | I2C_READ);
- for (i = 0; i < (length - 1); i++) {
- ret[i] = i2c_readAck();
- }
- ret[length - 1] = i2c_readNak();
- i2c_stop();
- return ret;
- } else {
- return NULL;
- }
- }
-
- void memWriteByte(uint32_t address, uint8_t data) {
- uint8_t addA, addB, memAddress = MEMTWIADDRESS;
- if (address >= 65536) {
- // Address needs more than 16 bits, we have to set the PAGE bit in i2c address
- memAddress |= 2;
- }
- addA = address & 0xFF00;
- addB = address & 0xFF;
- if (i2c_start(memAddress | I2C_WRITE) == 0) {
- i2c_write(addA);
- i2c_write(addB); // Give address to memory
- i2c_write(data);
- i2c_stop();
- }
- }
-
- void memWriteBytes(uint32_t address, uint8_t *data, uint8_t length) {
- uint8_t addA, addB, memAddress = MEMTWIADDRESS, i;
- if (address >= 65536) {
- // Address needs more than 16 bits, we have to set the PAGE bit in i2c address
- memAddress |= 2;
- }
- addA = address & 0xFF00;
- addB = address & 0xFF;
- if (i2c_start(memAddress | I2C_WRITE) == 0) {
- i2c_write(addA);
- i2c_write(addB); // Give address to memory
- for (i = 0; i < length; i++) {
- i2c_write(data[i]);
- }
- i2c_stop();
- }
- }
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