mcu 8051

ADC0804 reading the data sequence diagram.Analysis shows that when the intr# becomes low, the cs# is first low, at least after the rd# low TACC time, the data on the digital output reaches a stable state, the digital output port data can be directly read the data will be able to get the signal, read and go, immediately rd# pull high, and then cs# pull high, intr# is automatically changed, when the rd# low tR1 time, intr# automatically pull high, we do not have to intervene.Figure 4.4.6 and figu

the system can not pull down the reset pin caused, but my colleague's other project using the reset chip can also be implemented software reset, what is the reason for the solution.② another problem during the debugging process, an external interrupt trigger has entered two interrupt service subroutines.WORKAROUND: Close the external interrupt after entering the interrupt, and then at the end of the interrupt service subroutine, open an external interrupt, which resolves the issue of two extern

A full set of solutions for voice thermometers Based on the MCUThe DS18B20 temperature sensor is used in the design to collect the temperature in real time,Combined with ISD4004 voice chip and lcd1602 display module, the whole design realizes real-time temperature measurement and display.Displays and carries out voice broadcast, intelligently monitors 0 critical temperature values.The reference principle is as follows: Full data download: https://www.fageka.com/ I /vCIaOEN4904A full set of

#include MCU Lesson 15th: Clock

Jp3 is connected to P0, VCC is connected to + 5 V, and the eight left pins of the matrix keyboard are connected to P1. The expected result is to press 0th buttons, the digital display is 0, and so on. Note that the digital tube here is co-anode. #include Note that there is no deshake operation in the code because this does not affect the experiment results. MCU Lesson 8th: matrix keyboard scanning

; i ) { intv = src[i] 0xFF; String HV=integer.tohexstring (v); if(Hv.length () ) {stringbuilder.append (0); } stringbuilder.append (HV); } returnstringbuilder.tostring (); }4. Convert the hexadecimal byte[] intact to a string and separate each byte with a space, such as byte[]{0x7e,0x80,0x11,0x20}→7e 80 11 20, which can be used for log printing Public StaticStringBuilder Byte2hexstr (byte[] data) { if(Data! =NULL data.length > 0) {StringBuilder StringBuilder=

Common data conversion methods for Android and MCU communication 1. Convert GB2312 into Chinese, such as bafac2dcb2b7→ carrots, two bytes to synthesize a text public static string STRINGTOGBK (String string) throws Exception { byte[] bytes = new Byte[string.length ()/2]; for (int j = 0; J 　2. Convert Chinese to GB2312, and the results are returned in byte[] form, such as Carrot →new byte[]{ba FA C2 DC B2 B7}, one word is divided i

"variable.h"/* user code BEGIN includes */* user code END includ ES */* Private variables---------------------------------------------------------*/Uart_handletypedef Huart1; /* User code BEGIN PV */* Private Variables---------------------------------------------------------*/* User code EN D PV */* Private function prototypes-----------------------------------------------*/void Systemclock_config (void); void Error_Handler (void); static void Mx_gpio_init (void); static void Mx_usart1_uart_i

Bug in STM32F4 Series MCU, window watchdog WWDG. 1. If it is possible to pre-feed the dog interrupt, then the following two points must be met (1) Before turning on the WWDG interrupt, the EWI flag bit in the SR register must be zeroed out, otherwise the watchdog will constantly reset (2) Add a small delay to the WWDG_IRQ, otherwise the watchdog will be constantly reset 2. If there are other interrupts in the system, such as keystrokes, set a vari

Environment:Windows7 64B,JDK64B,MYECLIPSE8.5,RXTX Development Package, Stc,keil, Geshe Beacon, 51 single-chip microcomputer, RS232USB to serial line.Lower machine C code # include #include #define Inbuf_len 7//Data lengthunsigned char

MCU's micro-core, if UCOS-II has confirmed all task code snippets, stack segments, constant ends, etc. at compile time, and these are both direct and physical address bindings, this can be called a compilation of physical address bindings that

Generally, the serial port sends data by character, which is simple to send data. You can directly use the "Serial Port debugging assistant" to receive data and facilitate debugging.If binary data is used to send data, the sent content is greatly

Byte Operation Command Nop-; null operation Movwf F; send W content to F Clrw-; clear w 0 Clrf F; clear F 0 Subwf F, D; F minus W Decf F, D; F decrease by 1 Iorwf F, D; W and F logic or Andwf F, D; W and F logic and Xorwf F, D; W and F are

In, S1 and S2 are two signal ends, and vcc_s1 and vcc_s2 are the high-level voltages of these two signals. The other restrictions are as follows:1, vcc_s1 2. The low-level threshold of S1 is greater than or equal to V (depending on the diode

A well-written accurate decoding program PT2262 has passed the actual hardware test. Let's share the following:   /*************************************** * ** ******* File Name: decode. c : decodes the pt226 encoding signal. ******** the output

Hardware environment: p89lpc917, DS18B20 temperature chip, VDD = 3.3 V, debugging serial port;Software environment: Keil uvision2, serial communication controller (used to receive serial data) Process: After reading the data, it has many examples of

Serial port terminal program made of stc11f04 single-chip microcomputer. Similar to the Telnet command of a vswitch. Due to the rush of time, only a few simple commands are implemented. HelpLedbench onLedshortoffLed2_onLed2_off For example, enter?

PS/2 Overview PS/2 is divided into master and slave devices. The master device uses female sockets and male plug from the device. currently, the widely used PS/2 keyboard and mouse work in the device mode. PS/2 interface clockIt is an open-collector

First, I declare that I only implement some of the functions, and none of the functions that are not mentioned are implemented by default. Achieve: Get SD information, get the total partition information, get the information of a partition, read the

How to debug on KeilProgramHow to estimate the size of the RAM used by the program.   Many problems that need to be considered when porting the system to a single-chip microcomputer, such as re-entry, stack allocation, external storage usage, and