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IO: Avoid param writes which do not change a value

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This commit is contained in:
Lorenz Meier
2016-02-15 12:44:07 +01:00
parent c3529d353d
commit be6278a1ba
1 changed files with 16 additions and 5 deletions
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src/drivers/px4io/px4io.cpp
+16 -5
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@@ -626,7 +626,7 @@ PX4IO::init()
{
int ret;
param_t sys_restart_param;
int sys_restart_val = DM_INIT_REASON_VOLATILE;
int32_t sys_restart_val = DM_INIT_REASON_VOLATILE;
ASSERT(_task == -1);
@@ -634,7 +634,11 @@ PX4IO::init()
if (sys_restart_param != PARAM_INVALID) {
/* Indicate restart type is unknown */
param_set(sys_restart_param, &sys_restart_val);
int32_t prev_val;
param_get(sys_restart_param, &prev_val);
if (prev_val != DM_INIT_REASON_POWER_ON) {
param_set_no_notification(sys_restart_param, &sys_restart_val);
}
}
/* do regular cdev init */
@@ -815,8 +819,11 @@ PX4IO::init()
/* Indicate restart type is in-flight */
sys_restart_val = DM_INIT_REASON_IN_FLIGHT;
param_set(sys_restart_param, &sys_restart_val);
int32_t prev_val;
param_get(sys_restart_param, &prev_val);
if (prev_val != sys_restart_val) {
param_set(sys_restart_param, &sys_restart_val);
}
/* regular boot, no in-air restart, init IO */
@@ -849,7 +856,11 @@ PX4IO::init()
/* Indicate restart type is power on */
sys_restart_val = DM_INIT_REASON_POWER_ON;
param_set(sys_restart_param, &sys_restart_val);
int32_t prev_val;
param_get(sys_restart_param, &prev_val);
if (prev_val != sys_restart_val) {
param_set(sys_restart_param, &sys_restart_val);
}
}