Instruction manual

Renesas USB MCU and USB ASSP USB Basic Host and Peripheral firmware
R01AN0512EJ0210 Rev.2.10 Page 135 of 157
Apr 1, 2013
7. non-OS Scheduler
7.1 Overview
The non-OS scheduler executes task scheduling according to task priority. The following are non-OS task scheduler
features.
・ A scheduler function manages requests generated by the tasks and interrupt etc according to the relative
priority of the tasks.
・ When multiple requests are generated by tasks with the same priority, they are executed using a FIFO
configuration.
・ call-back functions are used for responses to tasks indicating the end of a request, so the customer need
only install appropriate class drivers for the system and there is no need to modify the scheduler itself.
7.2 non-OS Scheduler Macro
Table 7.1 shows the scheduler macro that user uses.
Table 7.1 Scheduler macro
Scheduler macro Registration function Description
R_USB_SND_MSG R_usb_cstd_SndMsg Specifies Task ID and transmits message
R_USB_ISND_MSG R_usb_cstd_iSndMsg Specifies Task ID from interrupt and transmits message.
R_USB_WAI_MSG R_usb_cstd_WaiMsg
Runs USB_SND_MSG after running the scheduler the
specified number of times.
R_USB_RCV_MSG R_usb_cstd_RecMsg Checks if received message is in specified mailbox.
R_USB_TRCV_MSG R_usb_cstd_RecMsg Checks if received message is in specified mailbox.
R_USB_PGET_BLK R_usb_cstd_PgetBlk Secures an area for storing a message.
R_USB_REL_BLK R_usb_cstd_RelBlk Releases an area for storing a message.
7.2.1 non-OS Scheduler API Function
Table 7.2 shows the list of API function for non-OS scheduler.
Table 7.2 List of non-OS scheduler API function
API function Description
R_usb_cstd_SndMsg() Sends processing requests to the priority table.
R_usb_cstd_iSndMsg() Sends processing requests from interrupts to the priority table.
R_usb_cstd_RecMsg() Checks if an execution request was issued.
R_usb_cstd_PgetBlk() Allocates an area for storing a request information table.
R_usb_cstd_RelBlk() Releases an area used for storing a request information table.
R_usb_cstd_Scheduler() Manages requests generated by the tasks.
R_usb_cstd_SetTaskPri() Set Task Priority.
R_usb_cstd_CheckSchedule() Checks whether or not processing is scheduled.