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Update some comments

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This commit is contained in:
Gregory Nutt 2018-08-03 09:30:31 -06:00
parent 10069067c1
commit 2fd4925965
1 changed files with 13 additions and 1 deletions
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14
include/nuttx/i2c/i2c_master.h
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@ -89,7 +89,19 @@
* that following message is simply a continuation of the transfer).
*
* A proper I2C repeated start would then have I2C_M_NOSTOP set on msg[n]
* and I2C_M_NOSTART *not* set on msg[n+1];
* and I2C_M_NOSTART *not* set on msg[n+1]. See the following table:
*
* msg[n].flags msg[n+1].flags Behavior
* ------------ --------------- -----------------------------------------
* 0 0 Two normal, separate messages with STOP
* on msg[n] then START on msg[n+1]
* 0* I2C_M_NOSTART Continuation of the same transfer (must
* be the same direction). See NOTE below.
* NO_STOP 0 No STOP on msg[n]; repeated START on
* msg[n+1].
*
* * NOTE: NO_STOP is implied in this case and may or not be explicitly
* included in the msg[n] flags
*/
#define I2C_M_READ 0x0001 /* Read data, from slave to master */