Simple single-color 8x8x8 LED Cube with AVRs
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mem.c 3.3KB

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  1. /*
  2. * mem.c
  3. *
  4. * Copyright 2011 Thomas Buck <xythobuz@me.com>
  5. * Copyright 2011 Max Nuding <max.nuding@gmail.com>
  6. * Copyright 2011 Felix Bäder <baeder.felix@gmail.com>
  7. *
  8. * This file is part of LED-Cube.
  9. *
  10. * LED-Cube is free software: you can redistribute it and/or modify
  11. * it under the terms of the GNU General Public License as published by
  12. * the Free Software Foundation, either version 3 of the License, or
  13. * (at your option) any later version.
  14. *
  15. * LED-Cube is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU General Public License
  21. * along with LED-Cube. If not, see <http://www.gnu.org/licenses/>.
  22. */
  23. #include <avr/io.h>
  24. #include <stdlib.h>
  25. #include <stdint.h>
  26. #include "twi.h"
  27. #include "mem.h"
  28. #include "serial.h"
  29. #include "strings.h"
  30. // address is a number between (inclusive) zero and 131071
  31. uint8_t memGetByte(uint32_t address) {
  32. uint8_t addA, addB, memAddress = MEMTWIADDRESS, ret;
  33. if (address >= 65536) {
  34. // Address needs more than 16 bits, we have to set the PAGE bit in i2c address
  35. memAddress |= 2;
  36. }
  37. addA = address & 0xFF00;
  38. addB = address & 0xFF;
  39. if (i2c_start(memAddress | I2C_WRITE) == 0) { // Send start, write address to read
  40. i2c_write(addA);
  41. i2c_write(addB); // Give address to memory
  42. i2c_rep_start(memAddress | I2C_READ); // Start again, this time reading
  43. ret = i2c_readNak(); // Read one byte from memory
  44. i2c_stop();
  45. return ret;
  46. } else {
  47. return 0;
  48. }
  49. }
  50. // Free returned memory!
  51. uint8_t *memGetBytes(uint32_t address, uint8_t length) {
  52. // We could use the High-Speed Mode of the FM24V10 here, but we don't, right now...
  53. uint8_t addA, addB, memAddress = MEMTWIADDRESS, i, *ret;
  54. if (address >= 65536) {
  55. // Address needs more than 16 bits, we have to set the PAGE bit in i2c address
  56. memAddress |= 2;
  57. }
  58. addA = address & 0xFF00;
  59. addB = address & 0xFF;
  60. ret = (uint8_t *)malloc(length); // Allocate memory for values read
  61. if (ret == NULL) {
  62. serialWriteString(getString(24));
  63. return NULL;
  64. }
  65. if (i2c_start(memAddress | I2C_WRITE) == 0) {
  66. i2c_write(addA);
  67. i2c_write(addB);
  68. i2c_rep_start(memAddress | I2C_READ);
  69. for (i = 0; i < (length - 1); i++) {
  70. ret[i] = i2c_readAck();
  71. }
  72. ret[length - 1] = i2c_readNak();
  73. i2c_stop();
  74. return ret;
  75. } else {
  76. return NULL;
  77. }
  78. }
  79. void memWriteByte(uint32_t address, uint8_t data) {
  80. uint8_t addA, addB, memAddress = MEMTWIADDRESS;
  81. if (address >= 65536) {
  82. // Address needs more than 16 bits, we have to set the PAGE bit in i2c address
  83. memAddress |= 2;
  84. }
  85. addA = address & 0xFF00;
  86. addB = address & 0xFF;
  87. if (i2c_start(memAddress | I2C_WRITE) == 0) {
  88. i2c_write(addA);
  89. i2c_write(addB); // Give address to memory
  90. i2c_write(data);
  91. i2c_stop();
  92. }
  93. }
  94. void memWriteBytes(uint32_t address, uint8_t *data, uint8_t length) {
  95. uint8_t addA, addB, memAddress = MEMTWIADDRESS, i;
  96. if (address >= 65536) {
  97. // Address needs more than 16 bits, we have to set the PAGE bit in i2c address
  98. memAddress |= 2;
  99. }
  100. addA = address & 0xFF00;
  101. addB = address & 0xFF;
  102. if (i2c_start(memAddress | I2C_WRITE) == 0) {
  103. i2c_write(addA);
  104. i2c_write(addB); // Give address to memory
  105. for (i = 0; i < length; i++) {
  106. i2c_write(data[i]);
  107. }
  108. i2c_stop();
  109. }
  110. }