sample_embedding_folder2/0759792.txt

Ticket Name: CCS/TDA2: How to use neon in CCS

Query Text:
Part Number: TDA2 Tool/software: Code Composer Studio in tda2 runs the neon code command on ccs8.2. When running to the red flag as shown in the figure, it will enter __isr_vector in single step: LDR pc [pc, #-8] @ 0x0C Prefetch Abort Set in ccs -mfloat-abi=softfp -mfpu=neon Neon initialization : MRC p15, #0, r3, c1, c0, #2 @ Read CPACR ORR r3, r3, #0x00F00000 @ Enable access toCP10 and CP11 MCR p15, #0, r3, c1, c0, #2 @ Write CPACRsobel.rar MOV r3, #0 MOV r0, #0x40000000 FMXR FPEXC, r0 @ Set FPEXC bit 30 to enable VFP MCR p15, #0, r3, c7, c5, #4 @flush prefetch buffer because of FMXR above

Responses:
Hi, Can you try the below sequence and see if it works for you: MRC p15, #0, r1, c1, c0, #2        @ r1 = Access Control Register
ORR r1, r1, #(0xf << 20)           @ enable full access for p10,11
MCR p15, #0, r1, c1, c0, #2        @ Access Control Register = r1
MOV r1, #0
MCR p15, #0, r1, c7, c5, #4        @ flush prefetch buffer
MOV r0,#0x40000000
FMXR FPEXC, r0                     @ Set Neon/VFP Enable bit Regards, Rishabh

Hi, I use this sequence, run to the red flag as shown in the figure it will enter LDR pc, [pc,#-8] in single step __isr_vector: LDR pc, [pc,#24] @ 0x00 Reset LDR pc, [pc,#-8] @ 0x04 Undefined Instruction LDR pc, [pc,#24] @ 0x08 Supervisor Call LDR pc, [pc,#-8] @ 0x0C Prefetch Abort LDR pc, [pc,#-8] @ 0x10 Data Abort LDR pc, [pc,#-8] @ 0x14 Not used LDR pc, [pc,#-8] @ 0x18 IRQ interrupt LDR pc, [pc,#-8] @ 0x1C FIQ interrupt this is project 8867.sobel.rar

Hi, For me the same sequence works with "mfpu=neon -mfloat-abi=hard". Can you see if the same works for you. Regards, Rishabh

Hi, You can also refer to "Entry" definition in PROCESSOR_SDK_VISION_03_05_00_00\ti_components\drivers\pdk_01_10_01_06\packages\ti\csl\arch\a15\src\csl_a15_init.asm. Regards, Rishabh

Hi, I haven't heard back from you, I'm assuming you were able to resolve your issue. If not, just post a reply below (or create a new thread if the thread has locked due to time-out). Regards, Rishabh