Difference between revisions of "SPI"
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| + | '''Serial Peripheral Interface Bus (SPI bus)''' | ||
| + | Connects circuitry with few wires over serial protocol. | ||
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| + | SPI supports an unlimited number of peripherals, which may all be identical. | ||
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| + | Daisy-chained SPI connects all the devices on a SPI bus in a loop. | ||
| + | In a daisy-chain SPI loop, the serial data out pin (SDO) of each device connected to the serial data in pin (SDI) of the next device in the loop. | ||
| + | A daisy-chained SPI bus uses 4 GPIO pins on the microcontroller, no matter how many SPI peripherals are attached. | ||
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| + | Chip-select SPI uses an additional dedicated chip-select pin for each SPI peripheral. | ||
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| + | (Other protocols, such as [[I2C]], require each peripheral on the bus to have a different (unique) address). | ||
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| + | == Further reading == | ||
| + | |||
| + | * [[Microcontroller Serial Communications Articles]] | ||
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[http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus Serial Peripheral Interface Bus] | [http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus Serial Peripheral Interface Bus] | ||
| − | + | * [https://www.sparkfun.com/spi_signal_names a redefinition of SPI signal names: "A REDEFINTION OF SPI SIGNAL NAMES"] by Nathan Seidle, founder of SparkFun Electronics. | |
Latest revision as of 12:32, 23 February 2024
Serial Peripheral Interface Bus (SPI bus) Connects circuitry with few wires over serial protocol.
SPI supports an unlimited number of peripherals, which may all be identical.
Daisy-chained SPI connects all the devices on a SPI bus in a loop. In a daisy-chain SPI loop, the serial data out pin (SDO) of each device connected to the serial data in pin (SDI) of the next device in the loop. A daisy-chained SPI bus uses 4 GPIO pins on the microcontroller, no matter how many SPI peripherals are attached.
Chip-select SPI uses an additional dedicated chip-select pin for each SPI peripheral.
(Other protocols, such as I2C, require each peripheral on the bus to have a different (unique) address).
Further reading[edit]
Serial Peripheral Interface Bus
- a redefinition of SPI signal names: "A REDEFINTION OF SPI SIGNAL NAMES" by Nathan Seidle, founder of SparkFun Electronics.
