freertos stm32

to a byte cell. Therefore, if the address width of the external device is 8 bits, then haddr[25:0] corresponds to STM32 's CPU pin fsmc_a[25:0] One by one, which can access up to 64M bytes of space. If the address width of the external device is 16 bits, then haddr[25:1] corresponds to STM32 's CPU pin fsmc_a[24:0] one by one. When applied, the FSMC_A bus can be connected to the address bus pins of the mem

Perhaps you think Io and Afio is very simple, in fact there are a few misunderstandings may be many people have not noticed, when you only use the off-the-shelf Development Board to learn, others have helped you to do a good job of resource allocation, all the peripheral function learning is according to other people to do the routine to you, which did not make you feel strange.Ask yourself a question: STM32, USART2 and TIM2 are shared with the same I

STM32 Usb-fs-device Development KitCompatible with the stm32f102xx and stm32f103xx series, STM32 L1 Ultra Low P Ower, STM32 F3 SeriesUSB on-the-go host and device libraryCompatible with the stm32f105x, stm32f107x devices in FS USB modesCompatible with the stm32f2xx and stm32f4xx devices in HS and FS USB modesCompatible with the stm32f7xx devices in HS and

STM32 A total of five clock sources, namely: HSI is a high-speed internal clock, rc oscillator, the frequency of 8MHz; HSE is a high-speed external clock with a frequency range of 4~6mhz; (can connect quartz/ceramic resonator or external clock source) LSI is low speed internal clock, frequency 40kHz; (independent watchdog clock source, available as RTC Clock source) The LSE is a low-speed external clock with a frequency of 32.768k

STM32 and the general single-chip microcomputer /ARM7 The biggest difference, it is its register is particularly many, and users are very difficult to write down all, therefore,ST Official according to the specification provided a set of library function source code, The purpose of the register operation is achieved by directly manipulating the library function.A firmware library is a collection of functions that are responsible for dealing directly w

Stm32 comes with USB interface, it is very suitable for HID equipment, and it is also very convenient to avoid the drive development.After using STM32 with the correct report descriptor configuration, plug in the USB and the computer is correctly identified as follows (device and printer)Can be set by right-click, game controllerBy selecting PropertiesThen click PropertiesThis test test is a simple test, th

About interrupt priority for STM32each interrupt in the 1.STM32 has a dedicated register, (Interrupt priority Register), which describes the preemptive and secondary priority of the outage, In this register STM32 uses 4 bits to describe the priority level2. Preemptive priority and sub-priority assignment Priority group Preemptive priority Sub-priority 4 4-bit/16

1.stm32 ad changes, task groups can be converted into two groups: Rule groups and injection groups. Random sequences transform multiple channels in random order to form a set of transformations. For example. Be able to complete the conversion, for example in the following order: Channel 3, Channel 8, Channel 2, Channel 2, Channel 0, Channel 2, Channel 2, channel 15. In the Execute Rule Channel Group scan transformation. Change. It is possible to blur

?EmWin for 12864 and port transplantSource code Download:rtx_emwin5.24_keil_vs2008-20141122.zip?Hardware environment:Cpu:stm32f103velcd:st7920 Controller 12864 and Port?Software Environment:Keil MDK4.74VS2008emWin5.24?Using the RTX operating system??1, the implementation of emWin5.24 in Keil and vs2008 the same code of the project, VS2008 catalog implementation on the official FMC Simulator simulation, Keil directory implementation in the Stm32f103ve drive 12864 of the same port screen?2, suppor

STM32 Learning is a gradual process, gradually familiar with a peripheral, to understand the register-related configuration, and then on this basis to achieve the function, the road to a step by step, grasp the knowledge of more natural know the direction of the road. Gpio is the most important peripheral of STM32, and almost all peripheral implementations are based on GPIO, so in-depth understanding is nec

This led applet is based on the minimum system board of the de-Lai. I was writing this program to be able to easily understand and facilitate portability. The trouble with a pin change for STM32 is that it's hard to get a job, so this time I'm writing this library, I also pay special attention to these aspects of a small LED is very simple sometimes used to do the adjustment trial, I think it is quite good below I will own the source of personal abili

Recently suddenly want to study STM32, see almost all of the tutorials are used in C-Series microcontroller program, so that has been studying C 艹 I write very not adapt to, today studied for a noon, successfully a single LED driver package into an Arduino-style class library, the use is very convenient, the method is as follows.Before you begin, it is recommended that you follow the methods described in this article in the

the normal and 7-bit address format direction of the transmission with the repeating start condition. The lowest bit of the first byte is "0", indicating that the host writes information to the selected slave, and "1" indicates that the master is reading the information to the slave machine. When an address is sent, each device in the system compares the first 7 bits to its own address after the starting condition, and if the device determines that it is addressed by the host, the slave receive

Port Multiplexing What's the trouble? re-use:The STM32 has many built-in peripherals, and the external pins of these peripherals are multiplexed with the Gpio. That is, if a gpio can be reused as a function pin for a built-in peripheral, it is called multiplexing when the Gpio is used as a built-in peripheral.How to use:1. Enable Gpio clock2. Enable the reusable function of the clock3. Setting the GPIO port data according to the data sheeteg. Rcc_apb

Using the Rikirobot robot to do the navigation experiment under ROS is careless to burn down the bottom control Panel and buy a new circuit board to start over./ARM-NONE-EABI-GCC/BIN/LD is always present under Ubunt when compiling STM32 source code throughout the merchant: Cannot find-lstdc++ error, which is a link error, is always not connected to libstdc++ when using the ARM-NONE-EABI-GCC compiler. First try using a method that is given online, The

This paper takes USART1 as an example to describe the programming process of serial port interruption. 1, first to tell about the application of the string in the mouth of some of the library files involved. First of all, for STM32 Peripheral library file application programming, MISC.C and STM32F10X_RCC.C are sure to be added to. And then there's the peripherals we're going to use. There is no doubt that serial file stm32f10x_usart.c is necessary. Se

Stack settings under STM32 Keil http://blog.csdn.net/u011784994/article/details/53157614 When you just took over STM32, you only write an int main () {while (1);} Build://program size:code=340 ro-data=252 rw-data=0 zi-data=1632 compiled, you will find that this program has used more than 1600 RAM, if the 51 SCM, the pain of death, Where did the 1600-plus RAM go, analysis Map, you will find that the heap and

What is DMA.DMA (direct Memory access, directly memory access) is an important feature of all modern computers, allowing different speeds of hardware devices to communicate without relying on a large amount of interrupt load on the CPU. Otherwise, the CPU needs to copy each fragment of data from the source to the register and then write it back to the new location. In this time, the CPU is not available for other jobs. (Baidu Encyclopedia)DMA can be considered a data porter What is the use of DM

FSMC LCD Color Learning Color Screen Driver Here is the main use of the 8080-port interface, color screen here with the controller and without the controller, 80 and the mouth has the following signal lines: CS: Chip selection signal WR: Write Data RD: Reading data RST: Resetting RS: Command/Data flag (0: Read-write command 1: read-write data) 80-Port Read and write process: ①: Set RS According to the type of write or read data to choose (RS: Command/Data flag (0: Read-write command 1: read-wr

STM32 internal watchdog settings STM32 has two watchdog, the IWDG internal watchdog is introduced here. Clock Source: Internal 40KHz clock, independent of the system clock. As shown below: The FSOC here is IWDG real clock. (Iwdg_prescaler_xx refers to the XX frequency division). IWDG Reload Value Register: RLR is a 16-bit register, only low 12bit can be used, other reservations. So the maximum value of th