LPC3250 U-Boot I2C使用

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• I2C相关命令

U-Boot$i2c nm

i2c - I2C sub-system

Usage:

i2c crc32 chip address[.0, .1, .2] count - compute CRC32 checksum

i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device

i2c md chip address[.0, .1, .2] [# of objects] - read from I2C device

i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)

i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)

i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)

i2c probe - show devices on the I2C bus

i2c read chip address[.0, .1, .2] length memaddress - read to memory

i2c reset - re-init the I2C Controller

i2c speed [speed] - show or set I2C bus speed

• 读取DS2460（从地址0x80）

U-Boot$i2c md 80 80

0080: 00 14 97 0f e0 3b 00 00 3c e7 fe 14 22 30 01 27    .....;..<..."0.'

• 写DS2460（固定子地址）：

修改地址0xA7的值为0x01:

U-Boot$i2c nm 80 a7

000000a7:len=1

 10 ? 1

000000a7:len=1