Hello Bowen,
Thank you for responding to my question. Yes I think the relay framework
will do what I want, I will try it out.
Kind regards
Stewart Charnell
On 17/01/2024 03:23, 汪博文 wrote:
Hello,
I'm Bowen Wang and nice to answer your question. Please correct me If
I understand wrong.
I think you want to use the relay framework
in nuttx/drivers/power/relay/relay.c and relay_gpio.c,
which are added by me in PR: power/relay: add relay driver framework
for NuttX by CV-Bowen · Pull Request #7954 · apache/nuttx (github.com)
<https://github.com/apache/nuttx/pull/7954>.
The realy framework has two part:
1. The first part is relay.c, relay.c did a very simple thing: convert
user ioctl(RELAYIOC_SET/GET) to the relay driver implemented
dev->ops->set()/get(),
and you can follow the following steps to implement a relay driver:
a. implement the relay ops (set()/get());
b. call relay_register() to register your relay driver (just like
relay_gpio.c does);
2. The second part is relay_gpio.c, relay_gpio.c base on the *alreay
implemented* gpio driver (ioexpander) to resigter a relay driver, so
if you has implemented
a ioexpander driver, you can enable config: CONFIG_RELAY_GPIO and then
call relay_gpio_register() to register a driver, a simple example in
sim is:
```c
diff --git a/boards/sim/sim/sim/src/sim_ioexpander.c
b/boards/sim/sim/sim/src/sim_ioexpander.c
index 599ac68743..9397967a24 100644
--- a/boards/sim/sim/sim/src/sim_ioexpander.c
+++ b/boards/sim/sim/sim/src/sim_ioexpander.c
@@ -29,6 +29,7 @@
#include <nuttx/ioexpander/gpio.h>
#include <nuttx/ioexpander/ioe_dummy.h>
+#include <nuttx/power/relay.h>
#include "sim.h"
@@ -76,6 +77,11 @@ int sim_gpio_initialize(void)
IOEXP_SETOPTION(ioe, 1, IOEXPANDER_OPTION_INTCFG,
(void *)IOEXPANDER_VAL_DISABLE);
gpio_lower_half(ioe, 1, GPIO_OUTPUT_PIN, 1);
+ int ret = relay_gpio_register(ioe, 1, false, "/dev/relay0");
+ if (ret < 0)
+ {
+ _err("relay register error\n");
+ }
/* Pin 2: an non-inverted, edge interrupting pin */
```
And I'm sorry that I missed the docs and examples about the new added
relay framework, I will add this later.
Kind regards
Bowen Wang
------------------------------------------------------------------------
Bowen Wang, wangbow...@xiaomi.com
*From:* Stewart Charnell <mailto:nu...@charnell.plus.com>
*Date:* 2024-01-17 04:33
*To:* dev@nuttx.apache.org
*Subject:* [External Mail][Quarantine]GPIO drivers
Hello,
I have a processor board with GPIO ports which I would like to use to
control such things as relays and PSU enable pins.
Do I need to write a GPIO driver? There is an I/O expander driver. Is
the I/O expander driver specific to expanders or can it be used
for GPIO
control?
Kind regards
Stewart Charnell
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