A SPI-based master-slave communication timing method
A technology of SPI module and SPI interface, which is applied in the direction of digital transmission system, instrument, transmission data organization to avoid errors, etc., and can solve the problems of low communication efficiency, no verification mechanism, short interval time, etc.
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[0036] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0037] One aspect of the present invention provides a master-slave communication timing method based on the SPI interface, such as figure 1 As shown, it mainly includes the following seven steps:
[0038] (1) After the main SPI sends 3 bytes of initial field data (PIB+LEN), the SS signal line fails (the SS signal is pulled high), and the failure time is 50us;
[0039](2) The active SS signal line of the main SPI sends subsequent data, and the data SS signal fails once every 16 bytes (the last time the main SPI sends data may be less than 16 bytes), and the failure time is 100us.
[0040] (3) After the main SPI sends the data, the SS signal is invalid for 100us;
[0041] (4) After receiving all the data from the SPI, clear the ha...
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