4.34. SBC
4.34.1. Module Files
4.34.1.1. Vendor Driver
Note
This driver has been provided by NXP Semiconductors, Inc. under the 3-Clause BSD License. It has been adapted to pass the interface configuration as parameter into the functions to enable the usage of multiple ICs in the system.
4.34.1.2. Driver
4.34.2. Description
As long as the Ignition signal is present, the SBC is operating normally in Running mode. If the Ignition signal is removed, the MCU will request to send the SBC to Standby mode. If no Ignition signal is present in Standby mode, the SBC will power down and also stop powering the MCU, which will then also shut down. When the Ignition signal is detected again at the SBC, it will start up and power the MCU. The MCU will then initialize the SBC, which will return to normal operation in Running mode after the initialization is complete. This sequence is shown in Fig. 4.18.
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digraph sbc_wakeup_states {
rankdir=LR;
node [shape = doublecircle] sbc_running
sbc_power_down;
node [shape = circle] sbc_standby
sbc_initialize
;
sbc_running [label=<<B>Running</B>>];
sbc_standby [label=<<B>Standby</B>>];
sbc_power_down [label=<<B>Power Down</B>>];
sbc_initialize [label=<<B>Initialize</B>>];
sbc_running -> sbc_running [label = "Ignition = 1"]
sbc_running -> sbc_standby [label = "Ignition = 0"]
sbc_standby -> sbc_running [label = "Ignition = 1"]
sbc_standby -> sbc_power_down [label = "Ignition = 0"]
sbc_power_down -> sbc_initialize [label = "Ignition = 1"]
sbc_power_down -> sbc_power_down [label = "Ignition = 0"]
sbc_initialize -> sbc_running
;
}](../../../../_images/graphviz-0d83bbdf6778fee87455d38ba70bd3c8420174ef.png)
Fig. 4.18 SBC wakeup state chart
