msp430 i2c

In order to write an article to pave the mat-remind yourself,,,,,,These two days have been looking for#pragma vector = port1_vectorvoid p1_interrupt ()//P1 port Interrupt function { }For the explanation of these two sentences, at least let oneself feel can persuade oneselfAfter seeing a lot of my own understanding#pragma vector = Port1_vectorIn layman's terms, this is to tell the C compiler that the function below you is the interrupt function of the P1 port, and enters the following function w

the MSP430 contains the adc12 module, which can complete 12-bit analog-to-digital conversion. When the requirements for precision or other indicators are not high, you can use the adc12 In the 430 microcontroller to complete the analog-to-digital conversion. Here we mainly implement a general adc12 module initialization Program . The specific data storage and processing needs to be added in the interrupt processing function. Hardware introduct

prohibited in this mode, DCO clock source if it is ACLK, then DCO is also valid;⑦ The MSP430 header file has a detailed definition of the low-power mode, such as: to enter the low-power mode 0, you can write the LPM0 directly in the program; Enter low-power mode 4 to write LMP4 directly. Exit the low-power mode as follows:Lpm0_exit; Exit low-Power mode 0 // too easy to have wood thereLpm4_exit; Exit Low Power Mode 4 (exceptLPM4.5 )Summarize the exper

Port Environment (Bold font in redIs the modified content,Blue bold ChineseFor special attention) 1. host environment: centos 5.5 and 1 GB memory in vmare. 2. Integrated Development Environment: Elipse ide 3. compiling environment: Arm-Linux-GCC v4.4.3 and arm-None-Linux-gnueabi-GCC v4.5.1. 4. Development Board: mini2440, 2 m nor flash, 128 m nand Flash. 5, U-boot version: u-boot-2009.08 6, Linux: linux-2.6.32.2 7. References: Complete embedded Linux application development manual, edited by Wei

This time I will study the Code with the I2C driver in the kernel. Before going into the code, I will first briefly understand the relationship between the I2C core data structure. From this, we may be able to have a better understanding of the driver code. The design of the software data structure and the relationship between the data structures should at least describe the Organizational Relationship of t

Forward the blog about I2C by Mr. Netease DP, which is easy to find during learning.Recently, it was found that the primary device reset may cause an I2C deadlock when accessing the I2C device. The result is high in the SCL and low in the SDA. After that, it is found that the I2C bus is pulled from the device. After th

Simulation of I2C bus multi-master communication research and Software Design Author:■ Zheng Xuyang, Xi'an University of electronic science and technology, Li Bingbing, Huang Xinping Abstract:This paper introduces the principle of multi-master communication simulating I2C bus, and proposes a new implementation method. This method uses delayed receiving comparison to implement arbitration, so that common Mic

I2C bus is widely used in all embedded systems and is an industrial-level bus. However, because stm32 is a 32-bit MCU, it is doomed that its I2C hardware interface will be powerful, but it will also be difficult to control, unlike 8-bit machines, such as avr8-bit Twi (actually fully compliant with I2C standards) so easy to use. the following are some of my experi

Find the source of a development environment that supports information about AVR, MSP430, and ARM-general Linux technology-Linux programming and kernel. For more information, see the following. The avr-libc of Ubuntu 8.04 is too old to feel bad. By luck, we found a third-party source. Http://think.objectweb.org/toolchains.html It contains three development environments: AVR, MSP 430, and ARM. I hope it will be useful to you. An environment th

;}} /*************************************** * *********************************** function: read a byte from the 3-wire SPI bus * parameter: * return: * Note :********** **************************************** * ********************/Unsigned char spi3_recv_byte (void) {unsigned char Cx = 8; unsigned char dat = 0; spi3_dir = ~ Spi3_io; while (CX --) {dat >>= 1; if (spi3_in spi3_io) DAT | = 0x80; else dat = ~ 0x80; spi3_sclk_0; spi3_sclk_1;} return dat ;} // Spi3.h # ifndef _ spi3_h __# DEFI

(){ReturnReadkey ();} To implement scanf call, you also need to set it. For detailed settings, refer to: MSP430 library In this way, the scanf port of the keyboard is completed. to use it, you only need to include the stdio. h file, and then initialize the keyboard. Example: Here, the example implements simple interaction between the keyboard and the LCD. When the keyboard inputs data, the LCD is displayed normally, just like the keyboard an

LCD is one of the most commonly used display devices in single chip microcomputer systems.ProgramThe database is tested on the msp430f169 and msp1430f149 single-chip microcomputer and can be used with confidence. LCD uses the 12864 liquid crystal of the ocmj4x8c model and the control liquid crystal uses the parallel method, the three control ports are p3.0, p3.1, and p3.2, and the data uses the P5 data IO port. Hardware introduction: 430 digital IO port: Msp430f149, msp430f169 has a tota

Using MSP430 (f149) for infrared reception is simpler than sending. The infrared sensor I use is hs0038b. The original output is low when receiving a 38 K infrared. Otherwise, the output is high, we can start to writeProgramBecause there are many circuit diagrams of hs0038b, I will not post them here. The following is a specific example.Code: # Include Include the sorted infrared transmission and receipt. Here we will make a record. If you have a

Tags: blog HTTP Io ar use for SP on 2014 // Chip msp430f149# Include "io430.h"// Define the clock speed# Define cpu_f (double) 8000000)// Define the latency Function# Define delay_us (x) _ delay_cycles (long) (cpu_f * (double) x/1000000.0 ))# Define delay_ms (x) _ delay_cycles (long) (cpu_f * (double) x/1000.0 )) Void main (void){Unsigned char I;Wdtctl = wdtpw + wdthold;P2dir | = 0x01;P5dir | = 0x70;Bcsctl1 = ~ Xt2off;Bcsctl1 + = 0x30; Do{Ifg1 = ~ Ofifg;For (I = 0xff; I> 0; I --);}While (ifg

First create a common point H file, add the common code as followstypedef union{ struct { unsigned char b0:1; unsigned char b1:1; unsigned char b2:1; unsigned char b3:1; unsigned char b4:1; unsigned char b5:1; unsigned char b6:1; unsigned char b7:1; } Bits;} Uint8_val;General definition when the union is written, to define a flag bit that occupies only a byte, simply define the Uchar byte and then refer to one of its members.For ex

Why I use P1out ^= 0x01; and p1out = 0x01^ is a different or calculated symbol so each operation is reversed. This operator, however, is maintained at a state of 1.P1out|=bit6 the value of P1out if it is 1, if it is 0, take the value of BIT6What do you mean, p1out |= BIT7?Define the P1.7, which is different from the definition of 51, 51 needs sbit, if you need to define p1.2,p1.3, you can write: P1out |=bit2 + BIT3, and then you can operate on it, such as P1out ^= BIT0, so P1.0 output high level

;//1. p3.6,p3.7 Selected as UART1 communication portME2 |= UTXE1 + URXE1;//2. Enable USART0 to be sent and acceptedUCTL1 |= CHAR;//3. Select 8-bit charactersUTCTL1 |= SSEL0;//4. Select Clock Source, Aclk:ssel0 //Smclk:ssel1UBR01 =0x03;//5. Baud Rate 32767hz:9600UBR11 =0x00;//UMCTL1 =0x4A;//ModulationUCTL1 = ~swrst;//6. Initialize the UART state machineIE2 |= URXIE1;//7. Enable USART1 to receive interrupts}/* Two, Uart1 send a byte*/voidUart1_send_byte (byte dat) { wh

Today, it has been a long time since the JTAG download problem of MSP430. In the end, it is actually a problem with the port mode. In My bios, the default port is the SSP mode, but if JTAG is used, it needs to be changed to the ECP or EPP mode. after entering the BIOS to correct it, there is no problem, debugging is now available. There is another problem that I don't know why. I have bought a 430 Development Board for a long time and used it out. T

operation register you need to control it in the MSP430G25XX.h and in the User guideDTC can control the sampling speed to some extentADC10SA is the start address, and I use 0x0200 because I know that the start of the data I collect is it,You need to add these two lines of code in your loop to keep the analog values up to date Adc10ctl0 |= ENC + adc10sc; Sampling and conversion start __bis_sr_register (Cpuoff + GIE); LPM0 with interrupts enabledThe second sentence is to

Download gcc:http://sourceforge.net/projects/mspgcc/from here After downloading it is a zip package, extracted, and then set environment variables, for example: Export path= $PATH: $HOME/tools/mspgcc-20120406-p20120911/bin You can compile a simple program to test, for example: #include Makefile is: LED.ELF:MAIN.C msp430-gcc.exe-os-mmcu=msp430f149-o led.elf main.c clean : rm led.elf