(nuttx) branch master updated: analog/ads1115: Speed up channel measurement delays

[xiaoxiang]

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xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git


The following commit(s) were added to refs/heads/master by this push:
     new b49b62a733 analog/ads1115: Speed up channel measurement delays
b49b62a733 is described below

commit b49b62a73324300355134acc628bc831d15e6192
Author: Matteo Golin <matteo.go...@gmail.com>
AuthorDate: Wed May 28 13:31:40 2025 -0400

    analog/ads1115: Speed up channel measurement delays
    
    The ADS1115 driver uses the `nxsig_usleep()` function to sleep for a
    65us delay, but with a 1ms tick resolution and the context-switching
    overhead, this is much more than 1ms. Introducing `up_udelay` (even with
    a larger duration because of the unreliability of busy-waiting) speeds
    up sampling noticeably.
    
    Signed-off-by: Matteo Golin <matteo.go...@gmail.com>
---
 drivers/analog/ads1115.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/analog/ads1115.c b/drivers/analog/ads1115.c
index 7d672f6e33..099a845f0e 100644
--- a/drivers/analog/ads1115.c
+++ b/drivers/analog/ads1115.c
@@ -423,7 +423,7 @@ static int ads1115_readchannel(FAR struct ads1115_dev_s 
*priv,
             {
               /* ADS1115 takes ~25 usec to wake up */
 
-              nxsig_usleep(25);
+              up_udelay(4000);
               ret = ads1115_read_current_register(priv, &buf);
               count++;
             }