btashton opened a new pull request #2637:
URL: https://github.com/apache/incubator-nuttx/pull/2637
## Summary
This adds primitive I2C master support to the BL602. Note this is still a
**DRAFT**.
TODO prior to merge:
- [ ] Properly handle `I2C_M_NOSTART` and `I2C_M_NOSTOP`. This IP block
does not allow direct control over these bits but the sub-address feature
should make this possible for most real cases.
- [ ] Add interrupt support
- [ ] Clean up the transaction start and end logic (right now
handling/clearing status bits is kind of a mess).
## Impact
Add I2C support to BL602
## Testing
Using I2C tool with some devices on the bus we can see basic functionality
```
nsh> i2c dev -b 0 0x00 0x7f
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- 3d -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
nsh> i2c get -b 0 -a 0x68 -r 0x75
READ Bus: 0 Addr: 68 Subaddr: 75 Value: 68
```
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