TODO: Do some checking, or, better yet (maybe) For a device "page write", the last byte must be Pages are blocks of 16 bytes, starting at 0x000. Serial.println("eeprom_read_byte, starting at 0") Read the first page in EEPROM memory, a byte at a time Change #if 1 to #if 0 so that it won't write over the stuff next timeĮeprom_write_page(DEVADDR, 0x000, msg1, sizeof(msg1)) Įeprom_write_page(DEVADDR, 0x100, msg2, sizeof(msg2)) Įeprom_write_page(DEVADDR, 0x1f0, msg3, 16) Serial.println("After erasing pages starting at 0x000, 0x100, and 0x1f0:") EEPROM pages that we are going to write to:Įeprom_write_page(DEVADDR, 0x000, msgf, 16) Įeprom_write_page(DEVADDR, 0x010, msgf, 16) Įeprom_write_page(DEVADDR, 0x020, msgf, 16) Įeprom_write_page(DEVADDR, 0x100, msgf, 16) Įeprom_write_page(DEVADDR, 0x1f0, msgf, 16) Change #if 0 to #if 1 and it will erase the I'll define it here rather than hard-code it inside all of theīyte msg1 = "Message 1." // data to writeĠxff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,Ġxff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff The seven-bit device address for EEPROMs * For a single device, connect as follows: * Derived from sketch for 24C64 devices posted on As far as I know, they are “safe,” to the hardware (assuming you are using 5 Volt devices) and they should work for all small I2C EEPROMS up to and including the 24C16 or equivalent.īottom line: IWFMYMMV (It Works For Me: Your Mileage May Vary) These few functions have been tested (somewhat) on 24C02 and 24C04 devices. The functions can be incorporated into a library if you are going to write different applications using them, but for testing I find that it’s more convenient to have them in the main sketch. The bottom line is that if you can read a single byte and you can write a single byte, you can expand to more elegant functions in any way that seems useful to you. I created a few functions that I thought might be useful. Here’s a demonstration that I worked up for a colleague who was reading and writing some 24C04 devices. larger than 24C02), the upper address bits are stuffed into the lower bits of the control byte (the first byte in the transfer). The smaller EEPROMS have a protocol that use a control byte and only one address byte. These have a protocol that has a control byte (device address) and two address bytes (for the EEPROM word address), so the EEPROM word address can be 16 bits long
#Eeprom reader for free
The evolved ST25DV-I2C tags are available in SO-8, TSSOP-8, and chip-scale packages including 8-lead UFDFPN, 12-lead UFDFPN, and WLCSP-10. The ST25DV-I2C Series Dynamic Tags are now available for free sampling and purchase on our eStore and the prices start from $0.33 for orders of 1,000 pieces in the SO8 package with 4Kbit EEPROM.The information and code on the playground are for large I2C EEPROMS (24C32 and larger).
#Eeprom reader password
ST’s ST25DV dynamic tags are compliant with the NFC Forum Type-5 specification and contain up to 64Kbits of EEPROM, with features including configurable password protection for user memory and an interrupt pin that can be programmed to respond to various events detected at the RF interface. Integrated circuitry to control energy harvesting provides an unregulated output voltage for powering external components in battery-less applications. ST’s innovative Fast Transfer Mode leverages a 256-Byte buffer to accelerate handling large files such as a host-system firmware update. The new tags retain their robustness and convenient features including support for Fast Transfer Mode and energy harvesting. ST’s ST25DV tags can fulfil multiple use cases throughout a product’s lifetime, including configuration and product tracking, user features, field maintenance, and end-of-life management. With its extra performance and flexibility, this latest evolution of the ST25DV-I2C boosts productivity and efficiency in industrial applications such as smart metering, asset tracking, and logistics, and brings superior user experiences to medical equipment, smart-home devices and lighting, smart retail labels, and consumer products.
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