Apr 4, 2002 - Karim Yaghmour asks: 'Flash/EEPROM programmers tend to be. MCUs, DSPs, FPGA, etc. That are able to be programmed from Linux while in circuit. Serial devices such as PIC/AVR microcontrollers, serial EEPROMs etc. I have not seen many EPROM programmers go USB yet, so any with defined serial port protocol should do the job as most support Motorola.

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The Maxim is device that adds storage to a project using a single microcontroller pin. We previously interfaced a, but this EEPROM is slightly different because it draws power directly from the 1-Wire bus. Grab the (PDF) and follow along while we read and write this simple 1-Wire memory. 1-Wire 1K EEPROM (Digikey #, $1.67) We used our to demonstrate the DS2431 EEPROM, we covered the proper connections and configuration options in. The DS2431 requires just two connections: ground (pin 1) and 1-Wire/power (pin 2). Pin 3 remains unconnected. Like last time, we used a 2K pull-up resistor with the 1-Wire bus.

First, we use the Bus Pirate’s SEARCH ROM command to identify connected 1-Wire devices. 1-WIRE>(240) The SEARCH ROM command reveals that there are 3 EEPROMs connected to the 1-Wire bus. The Bus Pirate stores the 64bit 1-wire addresses in macros so we don’t have to type it every time. We’ll work with the first device, identified by macro (1).

Writing to the DS2431 takes three steps: • Write data to DS2431’s 8byte ‘scratch pad’ EEPROM buffer • Verify the scratch pad contents and get the write access key • Copy data from the scratch pad to the EEPROM for permanent storage. Command 0x0f writes to the scratch pad. The scratch pad is an 8byte buffer that holds data prior to saving it permanently in the EEPROM. 1-WIRE>(85)(1) 0x0f 0x00 0x00 0 1 2 3 4 5 6 7 The MATCH ROM macro, (85), isolates the the first device, (1). 0x0f is the command to write to the scratch pad, followed by the start address, 0 0. Finally, we send eight bytes of data to save in the scratch pad. The scratch pad is eight bytes long, and all eight bytes will be copied from the scratch pad to the EEPROM at once.

1-WIRE>(85)(1) 0xaa r:3 r:8 r:2 r:2 To copy data from the scratch pad to the EEPROM, we must first retrieve a three byte access code from the scratch pad with the command 0xaa. The first three bytes are the access code (0x00 0x00 0x07), followed by the data contained in the scratch pad. 1-WIRE>(85)(1) 0x55 0x00 0x00 0x07 1WIRE BUS RESET OK 1WIRE WRITE ROM COMMAND: MATCH (0x55) *follow with 64bit address 1WIRE ADDRESS MACRO 1: 0x2D 0x54 0xD2 0xEF 0x00 0x00 0x00 0x2B 1WIRE WRITE: 0x55!!!! Command 0x55 with the correct access code will copy the scratch pad to the data EEPROM. Bit reads (!!!!) alternate between 0 and 1 when the copy completes. 1-WIRE>(85)(1) 0xf0 0x00 0x00 r:8 r:8 1WIRE BUS RESET OK 1WIRE WRITE ROM COMMAND: MATCH (0x55) *follow with 64bit address 1WIRE ADDRESS MACRO 1: 0x2D 0x54 0xD2 0xEF 0x00 0x00 0x00 0x2B 1WIRE WRITE: 0xF0 Command 0xf0 followed by a two byte memory address (0x00 0x00) begins the data read process. The first eight bytes (r:8) are the values we wrote earlier.

Reads don’t involve the scratch pad and don’t have an 8byte limit, so further reads continue to the end of the memory. Don’t forget to catch up on any you may have missed. Posted in, Tagged,,,,,,, Post navigation.