标题: ATmega8的eeprom读写操作程序 [打印本页]
作者: 筑梦守心    时间: 2019-9-18 11:26
标题: ATmega8的eeprom读写操作程序
ATmega8的eeprom读写操作，实测没问题

单片机源程序如下:
  1. //ICC-AVR application builder
  2. // Target : M8
  3. // Crystal: 8.0000Mhz

  5. #include <iom8v.h>
  6. #include <macros.h>
  7. #include <74164.h>
  8. #include <eeprom.h>

  10. unsigned char    display[4];  // 显示缓冲区
  11. unsigned char    dis;         // 当前显示
  12. unsigned char    s,m;          // 时间

  14. //TIMER0 initialisation - prescale:256
  15. // WGM: Normal
  16. // desired value: 5mSec
  17. // actual value:  4.992mSec (0.2%)
  18. void timer0_init(void)
  19. {
  20. TCCR0 = 0x00; //stop
  21. TCNT0 = 0x64; //set count
  22. TCCR0 = 0x04; //start timer
  23. }

  25. #pragma interrupt_handler timer0_ovf_isr:10
  26. void timer0_ovf_isr(void)
  27. {
  28. TCNT0 = 0x64; //reload counter value
  29. //  display
  30.     switch(dis){  //  显示
  31.         case  0:  write164(display[dis] | 0x70);  break;
  32.         case  1:  write164(display[dis] | 0xB0);  break;
  33.         case  2:  write164(display[dis] | 0xD0);  break;
  34.         case  3:  write164(display[dis] | 0xE0);  break;
  35.     }
  36.     if(++dis > 3) dis = 0;
  37. //end  display
  38. }

  40. //TIMER1 initialisation - prescale:1024
  41. // WGM: 0) Normal, TOP=0xFFFF
  42. // desired value: 1Hz
  43. // actual value:  1.000Hz (0.0%)
  44. void timer1_init(void)
  45. {
  46. TCCR1B = 0x00; //stop
  47. TCNT1H = 0xE1; //setup
  48. TCNT1L = 0x7C;
  49. OCR1AH = 0x1E;
  50. OCR1AL = 0x84;
  51. OCR1BH = 0x1E;
  52. OCR1BL = 0x84;
  53. ICR1H  = 0x1E;
  54. ICR1L  = 0x84;
  55. TCCR1A = 0x00;
  56. TCCR1B = 0x05; //start Timer
  57. }

  59. #pragma interrupt_handler timer1_ovf_isr:9
  60. void timer1_ovf_isr(void)
  61. {
  62. //TIMER1 has overflowed
  63. TCNT1H = 0xE1; //reload counter high value
  64. TCNT1L = 0x7C; //reload counter low value
  65. if(++s == 60){
  66.    s = 0;
  67.    if(++m == 60) m = 0;
  68. }
  69. EEPROMwrite(1,s);       //  保存时间
  70. EEPROMwrite(2,m);
  71. display[0] = s % 10;    //  刷新显示缓冲
  72. display[1] = s / 10;
  73. display[2] = m % 10;
  74. display[3] = m / 10;
  75. }

  77. //call this routine to initialise all peripherals
  78. void init_devices(void)
  79. {
  80. //stop errant interrupts until set up
  81. CLI(); //disable all interrupts
  82. DDRB = 0x01;    //  初始化操作74LS164的管脚
  83. DDRD = 0xC0;    //  初始化操作74LS164的管脚
  84. timer0_init();
  85. timer1_init();

  87. MCUCR = 0x00;
  88. GICR  = 0x00;
  89. TIMSK = 0x05; //timer interrupt sources
  90. SEI(); //re-enable interrupts
  91. //all peripherals are now initialised
  92. }

  94. //
  95. void main(void)
  96. {
  97. init_devices();
  98. s = EEPROMread(1);  //  读取时间
  99. m = EEPROMread(2);
  100. display[0] = s % 10;    //  刷新显示缓冲
  101. display[1] = s / 10;
  102. display[2] = m % 10;
  103. display[3] = m / 10;
  104. while(1);
  105. }
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