标签: 85RC16

85RC16是一款铁电存储器（FRAM），具有低功耗、高耐久性、快速写入等优点。通过芯片文档，可以看到对比常用的eeprom它的一些优势 与24C16的对比 读写速度 ：85RC16的读写速度更快，可达到与I2C总线速率相匹配的水平，没有像24C16那样的写操作延迟和页写限制，能够实现真正的随机字节写入，且不需要等待写周期完成，适合需要频繁、快速读写的应用场合。 写入耐久性 ：85RC16的写入耐久性更高，可承受的写入次数远超24C16，这使得其在需要频繁更新数据的应用中更具优势，使用寿命更长。 功耗 ：85RC16在读写操作时的功耗更低，有助于延长设备的电池寿命，对于对功耗敏感的便携式或电池供电设备来说，使用85RC16可以更有效地降低系统功耗。 数据安全性 ：85RC16采用铁电存储技术，数据保持性更好，能够在断电情况下更长时间地保留数据，相比24C16具有更高的数据安全性，适用于对数据可靠性要求较高的场合。 存储容量 ：24C16的存储容量一般为16K位，而85RC16的存储容量通常为16K字节，能够存储更多的数据。 成本 ：24C16的价格相对较低，成本优势明显，而85RC16由于其先进的技术和性能优势，价格相对较高。在一些对成本敏感且对性能要求不高的应用中，24C16可能更具竞争力。 对比eeprom读写时序上有一定差异，代码上需要略做调整。 #defineI2C0_S_ADDR_85RC16 0xA0 #defineI2C0_SPEED 1000000 // 首先是初始化过程 voidI2C0_init(void) { /* enable I2C0 clock */ rcu_periph_clock_enable(RCU_I2C0); i2c_software_reset_config(I2C0, I2C_SRESET_SET); i2c_software_reset_config(I2C0, I2C_SRESET_RESET); /* connect PB6 to I2C0_SCL */ /* connect PB7 to I2C0_SDA */ gpio_init(GPIOB, GPIO_MODE_AF_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_6|GPIO_PIN_7); gpio_bit_set(GPIOB, GPIO_PIN_6|GPIO_PIN_7); gpio_pin_remap_config(GPIO_I2C0_REMAP, DISABLE); /* I2C clock configure */ i2c_clock_config(I2C0, I2C0_SPEED, I2C_DTCY_2); /* I2C address configure */ i2c_mode_addr_config(I2C0, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C0_S_ADDR_85RC16); /* enable I2C0 */ nvic_irq_enable(I2C0_EV_IRQn, 0, 1); i2c_enable(I2C0); /* enable acknowledge */ i2c_ack_config(I2C0, I2C_ACK_ENABLE); i2c_stop_on_bus(I2C0); } 翻阅到读取数据逻辑 代码实现 voideeprom_buffer_read(uint8_t*p_buffer, uint16_tread_address, uint16_tnumber_of_byte) { uint8_tAddrValue=0; AddrValue= (I2C0_S_ADDR_85RC160xF0); // AddrValue|= ((read_address7) 0xE); // /* wait until I2C bus is idle */ while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY)) ; if (2==number_of_byte) { i2c_ackpos_config(I2C0, I2C_ACKPOS_NEXT); } /* send a start condition to I2C bus */ i2c_start_on_bus(I2C0); /* wait until SBSEND bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)) ; /* send slave address to I2C bus */ i2c_master_addressing(I2C0, AddrValue, I2C_TRANSMITTER); /* wait until ADDSEND bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)) ; /* clear the ADDSEND bit */ i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND); /* wait until the transmit data buffer is empty */ while (SET!=i2c_flag_get(I2C0, I2C_FLAG_TBE)) ; /* enable I2C0*/ i2c_enable(I2C0); /* send the EEPROM's internal address to write to */ i2c_data_transmit(I2C0, (read_address0xFF)); /* wait until BTC bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_BTC)) ; /* send a start condition to I2C bus */ i2c_start_on_bus(I2C0); /* wait until SBSEND bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)) ; /* send slave address to I2C bus */ i2c_master_addressing(I2C0, AddrValue, I2C_RECEIVER); if (number_of_byte3) { /* disable acknowledge */ i2c_ack_config(I2C0, I2C_ACK_DISABLE); } /* wait until ADDSEND bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)) ; /* clear the ADDSEND bit */ i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND); if (1==number_of_byte) { /* send a stop condition to I2C bus */ i2c_stop_on_bus(I2C0); } /* while there is data to be read */ while (number_of_byte) { if (3==number_of_byte) { /* wait until BTC bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_BTC)) ; /* disable acknowledge */ i2c_ack_config(I2C0, I2C_ACK_DISABLE); } if (2==number_of_byte) { /* wait until BTC bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_BTC)) ; /* send a stop condition to I2C bus */ i2c_stop_on_bus(I2C0); } /* wait until the RBNE bit is set and clear it */ if (i2c_flag_get(I2C0, I2C_FLAG_RBNE)) { /* read a byte from the EEPROM */ *p_buffer=i2c_data_receive(I2C0); /* point to the next location where the byte read will be saved */ p_buffer++; /* decrement the read bytes counter */ number_of_byte--; } } /* wait until the stop condition is finished */ while (I2C_CTL0(I2C0) 0x0200) ; /* enable acknowledge */ i2c_ack_config(I2C0, I2C_ACK_ENABLE); i2c_ackpos_config(I2C0, I2C_ACKPOS_CURRENT); } 通过文档翻阅写入数据逻辑 代码实现 voideeprom_buffer_write(uint8_t*p_buffer, uint16_twrite_address, uint16_tnumber_of_byte) { uint8_tAddrValue=0; AddrValue= (I2C0_S_ADDR_85RC160xF0); // AddrValue|= ((write_address7) 0xE); // Eeprom_WREnable(); /* wait until I2C bus is idle */ while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY)) ; /* send a start condition to I2C bus */ i2c_start_on_bus(I2C0); /* wait until SBSEND bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)) ; /* send slave address to I2C bus */ i2c_master_addressing(I2C0, AddrValue, I2C_TRANSMITTER); /* wait until ADDSEND bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)) ; /* clear the ADDSEND bit */ i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND); /* wait until the transmit data buffer is empty */ while (SET!=i2c_flag_get(I2C0, I2C_FLAG_TBE)) ; /* send the EEPROM's internal address to write to : only one byte address */ i2c_data_transmit(I2C0, (write_address0xFF)); /* wait until BTC bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_BTC)) ; /* while there is data to be written */ while (number_of_byte--) { i2c_data_transmit(I2C0, *p_buffer); /* point to the next byte to be written */ p_buffer++; /* wait until BTC bit is set */ while (!i2c_flag_get(I2C0, I2C_FLAG_BTC)) ; } /* send a stop condition to I2C bus */ i2c_stop_on_bus(I2C0); /* wait until the stop condition is finished */ while (I2C_CTL0(I2C0) 0x0200) ; Eeprom_WRDisable(); } 总结：本次项目中使用的GD32F303读写操作实现，对比之前用的eeprom，速度提高到1M，价格稍微贵了，读写速度提升了