TA的每日心情 | 奋斗
2023-12-3 18:51 |
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签到天数: 772 天 连续签到: 1 天 [LV.10]以坛为家III
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根据数据手册上说,ATmega328P应带有1K的EEPROM,那么好不好用呢，今天来试一下。
数据手册上关于EEPROM有三个寄存器。
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
256/512/512/1Kbytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and
255/511/511/1023. The initial value of EEAR is undefined. A proper value must be written before the EEPROM
may be accessed.
EEDR – The EEPROM Data Register
EECR – The EEPROM Control Register
然后，打开Studio6.2加入以下函数。
见程序清单：
#define F_CPU 8000000UL#include <avr/io.h>#include <util/delay.h>void EEPROM_write(unsigned int uiAddress, unsigned char ucData){ /* Wait for completion of previous write */ while(EECR & (1<<EEPE)) ; /* Set up address and Data Registers */ EEAR = uiAddress; EEDR = ucData; /* Write logical one to EEMPE */ EECR |= (1<<EEMPE); /* Start eeprom write by setting EEPE */ EECR |= (1<<EEPE);}unsigned char EEPROM_read(unsigned int uiAddress){ /* Wait for completion of previous write */ while(EECR & (1<<EEPE)) ; /* Set up address register */ EEAR = uiAddress; /* Start eeprom read by writing EERE */ EECR |= (1<<EERE); /* Return data from Data Register */ return EEDR;} unsigned char what;int main(void){ EEPROM_write(50,0x55); what = EEPROM_read(50); EEPROM_write(51,0x56); what = EEPROM_read(51); EEPROM_write(52,0x57); what = EEPROM_read(57); while(1) { }}运行结果如下：
经过计算器检查，0x56十进制就是86，一点错也没有 |
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发表于 2015-1-8 09:06:29
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