mirror of
https://github.com/pvvx/RTL00_WEB.git
synced 2024-12-27 08:15:17 +00:00
31 lines
1.4 KiB
Text
31 lines
1.4 KiB
Text
Example Description
|
|
|
|
This example describes how to use freertos tickless with uart interruptable interface
|
|
|
|
Requirement Components:
|
|
USBtoTTL adapter
|
|
|
|
Connect to PC
|
|
- Connect Ground: connect to GND pin via USBtoTTL adapter
|
|
- Use UART1
|
|
GPIOA_0 as UART1_RX connect to TX of USBtoTTL adapter
|
|
GPIOA_4 as UART1_TX connect to RX of USBtoTTL adapter
|
|
|
|
We also need connect GPIOC_1 as gpio interrupt which parallel with log uart rx pin.
|
|
|
|
In this example, freertos will enter/leave tickless automatically.
|
|
User can type continuous "Enter" in uart or log uart to wake system if system is in tickless.
|
|
System is keep awake until user type a command via uart.
|
|
|
|
There are some features in this example:
|
|
(1) We replace tickless' sleep function with system sleep api which save more power.
|
|
(2) Freertos enter tickless if the wakelock bit map is 0.
|
|
It means there is no function require system keep awake.
|
|
By default there is WAKELOCK_OS keep system awake.
|
|
So we need release this WAKELOCK_OS enable tickless mode.
|
|
(3) We configure uart rx as gpio interrupt mode. This make uart can wake system.
|
|
|
|
NOTICE: If you don't want loss any data from treating UART signal as GPIO interrupt,
|
|
you can set FREERTOS_PMU_TICKLESS_PLL_RESERVED to 1 in "platform_opt.h".
|
|
It will reserved PLL clock in tickless and UART can receive the whole data.
|
|
But it also cost more power consumption.
|