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Created page with '== Registers == {| class="wikitable" border="1" ! NAME ! ADDRESS ! WIDTH |- | REG_I2CDATA | 0x04004500 | 1 |- | REG_I2CCNT | 0x04004501 | 1 |} == REG_I2CDATA == {| class="wik…'
== Registers ==
{| class="wikitable" border="1"
! NAME
! ADDRESS
! WIDTH
|-
| REG_I2CDATA
| 0x04004500
| 1
|-
| REG_I2CCNT
| 0x04004501
| 1
|}
== REG_I2CDATA ==
{| class="wikitable" border="1"
! BIT
! DESCRIPTION
|-
| 0
| R/W, clear for write, set for read
|-
| 1
| Start/device select bit?
|-
| 2
| Restart/device reselect bit?
|-
| 3
| ?
|-
| 4
| SCL hold. When clear SCL is being held low, set when SCL is high. This bit must always be set after writing REG_I2CCNT.
|-
| 5
| SCL, toggle this for each loop iteration(in the loop execute the I2C WR code) with max 8 iterations where the loop exits successfully when bit 4 is set.
|-
| 6
| Unknown, always set when writing to CNT?
|-
| 7
| Enable/busy
|}
== Protocol ==
Wait for the busy bit to clear. Write the device address to REG_I2CDATA, then write 0xc2(busy/enable, bit 6, and start bit 1 set) to REG_I2CCNT. Execute swiWaitByLoop for a device-specific duration, then write the register address to REG_I2CDATA, and write 0xc0 to REG_I2CCNT.(busy/enable and bit 6 set) Wait with swiWaitByLoop device duration, then write the data to REG_I2CDATA when writing. When reading, write the device address to REG_I2CDATA and write 0xc2 to REG_I2CCNT. When the delay value is zero, write 0xc1 | i<<5 to REG_I2CCNT, otherwise write 0xc0 | i<<5 to REG_I2CCNT, wait for busy to clear, delay, then write 0xc5 to REG_I2CCNT. For writing i is the loop i for iteration, for reading replace that with 1. When reading, read the data from REG_I2CCNT. Return a error if REG_I2CCNT bit 4 SCL hold is set, otherwise return normal.
== I2C devices ==
=== Power management addr 0x4 ===
When registers 0x70 and 0x11 are set to 1 in that order, a power cycle is done.
{| class="wikitable" border="1"
! REGISTER
! DESCRIPTION
|-
| 0x11
| System reset register 2.
|-
| 0x31
| Camera related? Values can be 1 or 2. Probably either turns the cameras' power on/off, or sets which camera to use?(internal/external cameras.)
|-
| 0x70
| System reset register 1.
|}
{| class="wikitable" border="1"
! NAME
! ADDRESS
! WIDTH
|-
| REG_I2CDATA
| 0x04004500
| 1
|-
| REG_I2CCNT
| 0x04004501
| 1
|}
== REG_I2CDATA ==
{| class="wikitable" border="1"
! BIT
! DESCRIPTION
|-
| 0
| R/W, clear for write, set for read
|-
| 1
| Start/device select bit?
|-
| 2
| Restart/device reselect bit?
|-
| 3
| ?
|-
| 4
| SCL hold. When clear SCL is being held low, set when SCL is high. This bit must always be set after writing REG_I2CCNT.
|-
| 5
| SCL, toggle this for each loop iteration(in the loop execute the I2C WR code) with max 8 iterations where the loop exits successfully when bit 4 is set.
|-
| 6
| Unknown, always set when writing to CNT?
|-
| 7
| Enable/busy
|}
== Protocol ==
Wait for the busy bit to clear. Write the device address to REG_I2CDATA, then write 0xc2(busy/enable, bit 6, and start bit 1 set) to REG_I2CCNT. Execute swiWaitByLoop for a device-specific duration, then write the register address to REG_I2CDATA, and write 0xc0 to REG_I2CCNT.(busy/enable and bit 6 set) Wait with swiWaitByLoop device duration, then write the data to REG_I2CDATA when writing. When reading, write the device address to REG_I2CDATA and write 0xc2 to REG_I2CCNT. When the delay value is zero, write 0xc1 | i<<5 to REG_I2CCNT, otherwise write 0xc0 | i<<5 to REG_I2CCNT, wait for busy to clear, delay, then write 0xc5 to REG_I2CCNT. For writing i is the loop i for iteration, for reading replace that with 1. When reading, read the data from REG_I2CCNT. Return a error if REG_I2CCNT bit 4 SCL hold is set, otherwise return normal.
== I2C devices ==
=== Power management addr 0x4 ===
When registers 0x70 and 0x11 are set to 1 in that order, a power cycle is done.
{| class="wikitable" border="1"
! REGISTER
! DESCRIPTION
|-
| 0x11
| System reset register 2.
|-
| 0x31
| Camera related? Values can be 1 or 2. Probably either turns the cameras' power on/off, or sets which camera to use?(internal/external cameras.)
|-
| 0x70
| System reset register 1.
|}