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Quad SPI (QSPI; different to but has same abbreviation as Queued-SPI described in § Intelligent SPI controllers) goes beyond dual SPI, adding two more I/O lines (SIO2 and SIO3) and sends 4 data bits per clock cycle. Again, it is requested by special commands, which enable quad mode after the command itself is sent in single mode.
Flashrom is a software utility published under an open source license that can detect, read, verify, erase, or write EEPROMs using interfaces such as the Low Pin Count (LPC), FWH, parallel, and Serial Peripheral Interface (SPI). It can be used to flash firmware images such as BIOS or coreboot, or to backup existing firmware.
For example, Schmitt-trigger inputs, high-current output drivers, optical isolators, or combinations of these, may be used to buffer and condition the GPIO signals and to protect board circuitry. Also, higher-level functions are sometimes implemented, such as input debounce , input signal edge detection, and pulse-width modulation (PWM) output.
Image Pico [16] Raspberry Pi Ltd 51×21 40+3 via headers 6 micro-USB 2 MB 26 3 BOOTSEL Pico W [17] Raspberry Pi Ltd 51×21 40+3 via headers 6 micro-USB 2 MB 26 3 BOOTSEL Wi-Fi, Bluetooth: XIAO RP2040 [18] Seeed Studio 20×17.5×3.5 14 Reset Button/ Boot Button USB Type-C interface 2 MB BOOTSEL + RESET Nano RP2040 Connect [19] Arduino: 45×18 30 ...
The Raspberry Pi Zero v1.3 was released in May 2016, which added a camera connector. [40] The Raspberry Pi Zero W was launched in February 2017, a version of the Zero with Wi-Fi and Bluetooth capabilities, for US$10. [41] [42] The Raspberry Pi Zero WH was launched in January 2018, a version of the Zero W with pre-soldered GPIO headers. [43]
The Raspberry Pi interfaces, such as I²C, SPI and 1-Wire are supported in addition to the Ethernet-based field buses. Furthermore, SoftPLC systems under Windows and Linux are available, which turn industrial PCs and other standard device platforms from different manufacturers such as Janztec, WAGO , Siemens or Phoenix Contact into CODESYS ...
Code for embedded software is typically written in C or C++, but various high-level programming languages, such as Java, Python and JavaScript, are now also in common use to target microcontrollers and embedded systems. [7] Assembly languages are often used too, especially in booting and interrupt handling.
SDI-12 (Serial Digital Interface at 1200 baud) is an asynchronous serial communications protocol for intelligent sensors that monitor environment data. These instruments are typically low-power (12 volts), are used at remote locations, and usually communicate with a data logger or other data acquisition device.