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When configured as a slave, the SPI interface will remain inactive with MISO tri-stated as long as the SS pin is driven high. If the receiver is enabled, the data is moved to the receive buffer at the completion of the frame and can be read. As each character is shifted out from the master, a character is shifted in from the slave. Once this is done, a new character can be written. Writing a character will start the SPI clock generator, and the character is transferred to the shift register when the shift register is empty. When configured as a master, the SS pin will be configured as an output. The SPI character size is configurable to eight or nine bits. For a complete transaction, the master must shift N+1 characters. The N th slave connects its MISO back to the master. The MISO from the N-1 slaves is connected to the MOSI on the next slave. In this configuration, a common SS is provided to N slaves, enabling them simultaneously. It is also possible to connect all slaves in series. If the bus consists of several SPI slaves, they can be connected in parallel and the SPI master can use general I/O pins to control separate SS lines to each slave on the bus.
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To initiate a transaction, the master must pull this line low. The line where the data is shifted out from the master and into the slave. The line where the data is shifted out from the slave and into the master. In the figure below, the connection between one master and one slave is shown.
#Hw spi programmer driver#
Note The specific features are only available in the driver when the selected device supports those features. After each data transfer, the master can synchronize to the slave by pulling the SS line high.ĭriver Feature Macro Definition Driver feature macro Data is always shifted from master to slave on the Master Out - Slave In (MOSI) line, and from slave to master on the Master In - Slave Out (MISO) line. Master and slave prepare data to be sent in their respective shift registers, and the master generates the required clock pulses on the SCK line to interchange data. The SPI master initiates a communication cycle by pulling low the Slave Select (SS) pin of the desired slave. The master initiates and controls all data transactions. It allows fast communication between a master device and one or more peripheral devices.Ī device connected to the bus must act as a master or a slave.
#Hw spi programmer serial#
The Serial Peripheral Interface (SPI) is a high-speed synchronous data transfer interface using three or four pins. The outline of this documentation is as follows: The following devices can use this module: