![]() Similarly to the I2C, SPI is used to send data between microcontrollers and small peripherals, such as shift registers, sensors, SD cards and of course the 320x family of ADCs. ![]() SPI , or Serial Peripheral Interface, is a cousin of the I2C protocol, that thing Martin Mohr is always droning on about . However, before you start shifting analog data to and fro, you have to learn a little about the SPI protocol. Figure 1: The unassuming MCP3202 analog to digital converter. ![]()
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