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driver/sensor: replace lower->buffer_size with lower->buffer_number

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more efficient

Change-Id: I0823b10248caf75e4dd6a5086ad230ba4a7298f6
Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>
This commit is contained in:
Jiuzhu Dong
2021-02-24 15:26:15 -03:00
committed by Alan Carvalho de Assis
parent 6edeb9ebd9
commit 54ea96da6b
5 changed files with 40 additions and 51 deletions
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include/nuttx/sensors/ioctl.h
+7 -9
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@@ -261,16 +261,14 @@
#define SNIOC_GET_NEVENTBUF _SNIOC(0x0070)
/* Command: SNIOC_SET_BUFFER_SIZE
* Description: Set size of intermediate circualr buffer in upper half
* driver.
* Argument: This is the size of buffer pointer.
* Note: The application layer can set size of intermediate circualr
* buffer
* by this ioctl command. The size is in bytes, it should be a
* multiple of an event.
/* Command: SNIOC_SET_BUFFER_NUMBER
* Description: Set the number of events intermediate circualr buffer can
* hold in upper half driver.
* Argument: This is the number of events that buffer can hold.
* Note: The application layer can set number of events intermediate
* circualr buffer can hold by this ioctl command.
*/
#define SNIOC_SET_BUFFER_SIZE _SNIOC(0x0071)
#define SNIOC_SET_BUFFER_NUMBER _SNIOC(0x0071)
#endif /* __INCLUDE_NUTTX_SENSORS_IOCTL_H */
include/nuttx/sensors/sensor.h
+8 -10
View File
@@ -573,18 +573,16 @@ struct sensor_lowerhalf_s
int type;
/* The size of the circular buffer used, in bytes units.
* This sensor circular buffer is used to solve the issue where the
* application can't read sensor event in time. If this length of buffer
* is too large, the latency of the sensor event will be too large.
* If the length of buffer is too small, the events will be overwriten
* before the application can read them.
* So, it's recommended to set the size according to sensor ODR. If ODR is
* low, you can set to a length of sensor event. If ODR is high, you can
* set to two or three times the length of sensor event.
/* The number of events that the circular buffer can hold.
* This sensor circular buffer is used to slove issue that application
* can't read sensor event in time. If this number of events is too large,
* the latency of sensor event will be too larage. If the number of events
* is too small, the event will be overwrite before application read them.
* So, it's recommended to set according to sensor odr. If odr is low, you
* can set to one. If odr is high, you can set to two or three.
*/
uint32_t buffer_size;
uint32_t buffer_number;
/* The uncalibrated use to describe whether the sensor event is
* uncalibrated. True is uncalibrated data, false is calibrated data,