檢視 SCCB, Arducam/OVM7251 的原始碼

[[File:bp_rpi_ov7251.jpg|400px|bus priate hacking ovm7251]]

== I2C init cmd ==
<pre>
HiZ>m
1. HiZ
2. 1-WIRE
3. UART
4. I2C
5. SPI
6. 2WIRE
7. 3WIRE
8. LCD
x. exit(without change)

(1)>4
Set speed:
 1. ~5KHz
 2. ~50KHz
 3. ~100KHz
 4. ~400KHz

(1)>4
Ready
I2C>P
Pull-up resistors ON
Warning: no voltage on Vpullup pin
I2C>W
POWER SUPPLIES ON
I2C>
HiZ>m
1. HiZ
2. 1-WIRE
3. UART
4. I2C
5. SPI
6. 2WIRE
7. 3WIRE
8. LCD
x. exit(without change)

(1)>4
Set speed:
 1. ~5KHz
 2. ~50KHz
 3. ~100KHz
 4. ~400KHz

(1)>4
Ready
I2C>P
Pull-up resistors ON
Warning: no voltage on Vpullup pin
I2C>W
POWER SUPPLIES ON
I2C>
</pre>

== SCCB Read/Write ==
<pre>
I2C>[0xc0 0x35 0x02][0xc1 r]
I2C START BIT
WRITE: 0xC0 ACK 
WRITE: 0x35 ACK 
WRITE: 0x02 ACK 
I2C STOP BIT
I2C START BIT
WRITE: 0xC1 ACK 
READ: 0x80 
NACK
I2C STOP BIT

I2C>[0xc0 0x35 0x02 0xf0]
I2C START BIT
WRITE: 0xC0 ACK 
WRITE: 0x35 ACK 
WRITE: 0x02 ACK 
WRITE: 0xF0 ACK 
I2C STOP BIT

I2C>[0xc0 0x35 0x02][0xc1 r]
I2C START BIT
WRITE: 0xC0 ACK 
WRITE: 0x35 ACK 
WRITE: 0x02 ACK 
I2C STOP BIT
I2C START BIT
WRITE: 0xC1 ACK 
READ: 0xF0 
NACK
I2C STOP BIT

</pre>


[[File:IMG_20201117_171416598.jpg|1200px|SCCB_write_01]]


[[File:IMG_20201117_171508585.jpg|1200px|SCCB_write_02]]