RTOS/AM3356: Hwi_Create; Hwi_Params.priority

Kanae,

Unfortunately its not documented by SYSBIOS for the user since it is dependent on the hardware device. However, I was able to find it in sysbios in the file: <SYSBIOS_INSTALL>/packages/ti/sysbios/family/arm/a8/intcps/Hwi.xs

var deviceTable = {
"TMS320DM8168": {
useCodeMemory : true,
vectorTableAddress : null,
numPriorities : 64,
},
"TMS320DM8148": {
useCodeMemory : true,
vectorTableAddress : null,
numPriorities : 64,
},
"TMS320C3430": {
useCodeMemory : true,
vectorTableAddress : null,
numPriorities : 64,
},
};

deviceTable["AM335.*"] = deviceTable["TMS320DM8168"];


I was also able to find this in the AM335x Techincal Reference Manual where it talks about the second level priortization below:

4.4.2.3.4.2 Interrupt Prioritization
The next stage of the INTC is prioritization. Since multiple events can feed into a single channel and
multiple channels can feed into a single host interrupt, it is to read the status of all system events to
determine the highest priority event that is pending. The INTC provides hardware to perform this
prioritization with a given scheme so that software does not have to do this. There are two levels of
prioritizations:
• The first level of prioritization is between the active channels for a host interrupt. Channel 0 has the
highest priority and channel 9 has the lowest. So the first level of prioritization picks the lowest
numbered active channel.
• The second level of prioritization is between the active system events for the prioritized channel. The
system event in position 0 has the highest priority and system event 63 has the lowest priority. So the
second level of prioritization picks the lowest position active system event

Judah