hal

Convert DWT cycle count to time using STM32 and HAL

由 醉酒当歌 提交于 2021-02-11 17:01:58
问题 I am developing on STM32F302R8 in FreeRTOS. I am using the following DWT code from here to profile execution time. My DWT cycle count seems to be working, but I am unsure how to convert it into seconds. From what I gathered online, it seems like the cycle count is based on the CPU frequency. Which HAL function will return the correct CPU frequency for me? I am thinking that it's one of the following uint32_t HAL_RCC_GetSysClockFreq(void); uint32_t HAL_RCC_GetHCLKFreq(void); uint32_t HAL_RCC

Spring data rest application not getting data from database after implementing redis caching

由 橙三吉。 提交于 2021-02-11 14:44:08
问题 I am working on implementing Redis caching for my spring data rest (hal) api. Requirement: cache all data to redis after first call to database and perform operations on redis. like Add record should first happen in cache and then inserted in database in a transaction. I implemented caching for one of the JpaRepository, but when I do implicit findAll by calling the /states endpoint, I get no records, even when I have 10k records in database. Please help guys!! Below is my config:

HID report not working while changed length

由 二次信任 提交于 2021-02-08 05:45:56
问题 I'm building a custom keyboard with stm32f103. My first trial with standard 8 byte works pretty well: 0x05, 0x01, // Usage Page (Generic Desktop) 0x09, 0x06, // Usage (Keyboard) 0xA1, 0x01, // Collection (Application) //Modifiers 0x05, 0x07, // Usage Page (Key Codes) 0x19, 0xe0, // Usage Minimum (224) 0x29, 0xe7, // Usage Maximum (231) 0x15, 0x00, // Logical Minimum (0) 0x25, 0x01, // Logical Maximum (1) 0x75, 0x01, // Report Size (1) 0x95, 0x08, // Report Count (8) 0x81, 0x02, // Input (Data

How the callback functions work in stm32 Hal Library?

由 岁酱吖の 提交于 2021-01-28 07:38:41
问题 As we all know,the Hal Lib provides some callback function to manage hardware interrupt.But i don't know how them work? Te fact is that I am using HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) this function so as to receive other devices' data and check those data.So I use the usart interrupt to receive them. But I don't know when the callback function will be executed,is it depends on the receive buffer's length or the data's buffer? I guess the hardware interrupt will be triggered

Android sensors hardware abstraction layer

由 ぐ巨炮叔叔 提交于 2020-12-14 13:01:34
问题 I'm working on sensor data acquisition in Android (Jelly Bean on Samsung Galaxy S3). I'm new to Android/Linux internals. I'm trying to read Android sources on how the sensor samples rise from the drivers to userspace. As a reference take a look here. I can go all the way from the SensorManager down to the SensorService. I can see the kernel module loading infrastructure, the registration of the event input device and the input_report_rel() function calls in the drivers (e.g. the open-sourced

Android sensors hardware abstraction layer

由 白昼怎懂夜的黑 提交于 2020-12-14 12:59:46
问题 I'm working on sensor data acquisition in Android (Jelly Bean on Samsung Galaxy S3). I'm new to Android/Linux internals. I'm trying to read Android sources on how the sensor samples rise from the drivers to userspace. As a reference take a look here. I can go all the way from the SensorManager down to the SensorService. I can see the kernel module loading infrastructure, the registration of the event input device and the input_report_rel() function calls in the drivers (e.g. the open-sourced

Bluetooth

由 懵懂的女人 提交于 2020-01-24 01:50:18
Android provides a default Bluetooth stack, BlueDroid, that is divided into two layers: The Bluetooth Embedded System (BTE), which implements the core Bluetooth functionality and the Bluetooth Application Layer (BTA), which communicates with Android framework applications. A Bluetooth system service communicates with the Bluetooth stack through JNI and with applications through Binder IPC. The system service provides developers access to various Bluetooth profiles. The following diagram shows the general structure of the Bluetooth stack: Application framework At the application framework level

How to decrease SPI overhead time for STM32L4 HAL library

由 邮差的信 提交于 2020-01-02 07:00:10
问题 I am using a STM32L476RG board and HAL SPI functions: HAL_SPI_Transmit(&hspi2, &ReadAddr, 1, HAL_MAX_DELAY); HAL_SPI_Receive(&hspi2, pBuffer, 4, HAL_MAX_DELAY); I need to receive data from accelerometer's buffer with maximum speed and I have a problem with delay in these functions. As you can see on the oscilloscope screenshots, there are several microseconds during which nothing happens. I have no idea how to minimize the transmission gap. I tried using HAL_SPI_Receive_DMA function and this

HAL_SetDate sets the year to wrong value

由 醉酒当歌 提交于 2020-01-01 07:01:05
问题 I'm using STM32F030RCT6 with CubeMX. Device is a datalogger and RTC is the main thing that cannot fail. On Errata Sheet there is something about RTC Shadow Register. I configured CubeMX to not generate MX_RTC_Init() function and it has been working normally so far. (I'm using LSE) I need to update the time/date from GSM time but when I set the year to 18 with HAL_SetDate() and after a small delay I read with HAL_GetDate() , sDate.Year gave me 20 . Apart from Year , the other values are

Python, In linux obtain VGA specifications via lspci or HAL?

由 ╄→гoц情女王★ 提交于 2019-12-24 07:46:31
问题 I'm currently using dmidecode for everything else but I've yet to find good information on retrieving specifications for a video card on Linux (Mainly Fedora, Ubuntu, Debian, CentOS, RedHat) What i was thinking of using was: lspci -v or HAL What would be the most efficient way to parse lspci data, obtaining just VGA portion to then output json . def get_graphic_card_properties(): import dbus bus = dbus.SystemBus() hal_manager_object = bus.get_object('org.freedesktop.Hal', '/org/freedesktop
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