{"id":2796,"date":"2019-07-12T09:06:40","date_gmt":"2019-07-12T09:06:40","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=2796"},"modified":"2023-09-05T11:03:08","modified_gmt":"2023-09-05T05:33:08","slug":"spi-minimal-bus-configuration","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/spi-minimal-bus-configuration\/","title":{"rendered":"STM32 SPI Lecture 4 : SPI minimal bus configuration"},"content":{"rendered":"
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SPI minimal bus configuration<\/span><\/h2>\n
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The figure illustrates a minimal SPI bus<\/a> <\/span>configuration, highlighting that the SPI protocol can be implemented with as few as two wires – one for clock and the other for synchronous data transfer.<\/span><\/p>\n

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Figure 1. Minimum bus configuration of SPI.<\/figcaption><\/figure>\n

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This simplified configuration is suitable for certain applications where data exchange between the SPI nodes and slave select management is straightforward. In this explanation, we’ll delve into the concept of this minimal SPI bus configuration.<\/span><\/p>\n

SPI, or Serial Peripheral Interface, is a communication protocol widely used in microcontroller-based systems for connecting a master device (often a microcontroller or similar controller) with one or more slave devices (such as sensors, memory chips, or displays). The standard SPI bus includes four essential lines: Serial Clock (SCK), Master Out Slave In (MOSI), Master In Slave Out (MISO), and Slave Select (SS or CS).<\/span><\/p>\n

From Figure 1. The slave always receives the data, and the slave will never send any data to the master, and the master always sends the data. In this case, only two lines are sufficient for data communication between the master and slave device.<\/span><\/p>\n

So here, all four lines are not required. Depending on the application, one can customize the SPI signals.<\/span><\/p>\n

Important to note that in this minimal configuration:<\/span><\/strong><\/p>\n