SimilarĮxperiments were even carried out in air by Tanimoto et al. The electron depletion and confinement region at the GaAs–AlGaAs interface directly in real space. Single GaAs–AlGaAs heterostructure interfaces were first investigated by Salemink et al. Scanning tunneling microscopy (STM) is widely used to investigate surface effects on various materials. This behavior is ascribed to the influence of surface depletion and thus, a comparison ofĬurrent imaging spectroscopy data taken at 300 K and in liquid helium directly yields theĮdge depletion width of the quantum wires. Into the STM tip, whereas symmetric current–voltage curves are observed on the wires. Significant current is only observed for electrons which tunnel from the GaAs valence band Were measured on the wires and in the depleted areas between them. In order to keep the total tunneling barrier as small as possible. Inverted heterostructures with thin and highly doped cap layers were used as substrates
![2 wire library for stm 2 wire library for stm](https://media.sciencephoto.com/image/c0094471/800wm/C0094471-Oersted_Experiment,_1_of_1.jpg)
Wires are reported, which were fabricated by laser holography and wet chemical etching. In this work, low temperature scanning tunneling microscopy (STM) studies on quantum Walter Schottky Institut, TU München, D- 85748, Garching, Germanyįrauenhoferinstitut für angewandte Festkörperphysik, Tullastraße 72, D-79108 Freiburg, Germany Institut für Festkörperelektronik, Floragasse 7, A-1040 Wien, Austria STM studies on quantum wire structures in air and liquid helium * then this function will be called where you can initialize custom pins for I2C peripheral.Superlattices and Microstructures, Vol. * When you call TM_I2C_Init() function, and if you pass TM_I2C_PinsPack_Custom to function, * Callback for custom pins initialization. * - uint8_t direction: master to slave or slave to masterĮxtern int16_t TM_I2C_Start(I2C_TypeDef* I2Cx, uint8_t address, uint8_t direction, uint8_t ack) Įxtern uint8_t TM_I2C_Stop(I2C_TypeDef* I2Cx) Įxtern uint8_t TM_I2C_ReadNack(I2C_TypeDef* I2Cx) Įxtern uint8_t TM_I2C_ReadAck(I2C_TypeDef* I2Cx) Įxtern void TM_I2C_WriteData(I2C_TypeDef* I2Cx, uint8_t data) * Returns 1 if device is connected, or 0 if notĮxtern uint8_t TM_I2C_IsDeviceConnected(I2C_TypeDef* I2Cx, uint8_t address) * Checks if device is connected to I2C bus * - uint8_t count: how many bytes you want to writeĮxtern void TM_I2C_WriteMultiNoRegister(I2C_TypeDef* I2Cx, uint8_t address, uint8_t* data, uint16_t count) * - uint8_t *data: pointer to data array to write data to slave * Write multi bytes to slave without setting register from where to start write * - uint8_t data: data byte which will be send to deviceĮxtern void TM_I2C_WriteNoRegister(I2C_TypeDef* I2Cx, uint8_t address, uint8_t data) * Useful if you have I2C device to read like that: * Write byte to slave without specify register address * - uint8_t count: how many bytes will be writtenĮxtern void TM_I2C_WriteMulti(I2C_TypeDef* I2Cx, uint8_t address, uint8_t reg, uint8_t *data, uint16_t count) * - uint8_t *data: pointer to data array to write it to slave * Read multi bytes from slave without setting register from where to start readĮxtern void TM_I2C_ReadMultiNoRegister(I2C_TypeDef* I2Cx, uint8_t address, uint8_t* data, uint16_t count) Įxtern void TM_I2C_Write(I2C_TypeDef* I2Cx, uint8_t address, uint8_t reg, uint8_t data) * Read byte from slave without specify register addressĮxtern uint8_t TM_I2C_ReadNoRegister(I2C_TypeDef* I2Cx, uint8_t address) * - uint8_t count: how many bytes will be readĮxtern void TM_I2C_ReadMulti(I2C_TypeDef* I2Cx, uint8_t address, uint8_t reg, uint8_t *data, uint16_t count) * - uint8_t *data: pointer to data array to store data from slave * - uint8_t address: 7 bit slave address, left aligned, bits 7:1 are used, LSB bit is not usedĮxtern uint8_t TM_I2C_Read(I2C_TypeDef* I2Cx, uint8_t address, uint8_t reg) * - TM_I2C_PinsPack_t pinspack: Pins usedĮxtern void TM_I2C_Init(I2C_TypeDef* I2Cx, TM_I2C_PinsPack_t pinspack, uint32_t clockSpeed)
![2 wire library for stm 2 wire library for stm](https://www.mouser.com/images/marketingid/2020/img/118827073.png)
Both wires need external pull up resistor, from about 4k7 to 47k, if you don’t use pull up resistors in MCU.
#2 WIRE LIBRARY FOR STM SERIAL#
SDA: Serial data, bidirection line for receving and transmitting.SCL: Serial Clock, clock for serial synchronization.This protocol is commonly used with RTC modules, temperature sensors, EEPROMs, IO expanders and more. I2C or Inter- Integrated Circuit is a multimaster serial single ended bus.