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Diffstat (limited to 'docs/usb-c.md')
| -rw-r--r-- | docs/usb-c.md | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/docs/usb-c.md b/docs/usb-c.md index 6952488469..1723ac7921 100644 --- a/docs/usb-c.md +++ b/docs/usb-c.md @@ -83,8 +83,11 @@ Right now platform/ec has two different implementations of USB-C PD stack. [`usb_pd_protocol.c`](../common/usb_pd_protocol.c) 2. The newer implementation is broken up into multiple different files and state machines - * Policy engine state machine files, such as `usb_pe_*_sm.c`. - * Type-C physical layer state machine: `usb_tc_sm.c` + * Policy engine state machine files, `usb_pe_*_sm.c`. + * Protocol engine state machine file, `usb_prl_sm.c`. + * State machine manager file, `usb_sm.c`. + * Type-C physical layer state machine files, `usb_tc_*_sm.c`. + * USB-C PD Task file, `usbc_task.c`. The older implementation supports firmware for device types other than Chromebooks. For example, the older stack supports the Zinger, which is the @@ -106,7 +109,7 @@ In both older and newer implementations, the following details apply: * The `PD_C#` task runs the state machine (old or new) for the port and communicates with the TCPC, MUX, and PPC. This task needs a large task stack. - * The `PD_INT_C#` tasks runs at a higher priority than the state machine + * The `PD_INT_C#` tasks run at a higher priority than the state machine task, and its sole job is to receive interrupts from the TCPC as quickly as possible then send appropriate messages to other tasks (including `PD_C#`). This task shouldn't need much stack space, but the i2c |