Communication Between ARM and DSP Vincent Han Mar

Communication Between ARM and DSP Vincent Han Mar, 2014 TI Information – Selective Disclosure 1

Agenda • ARM and DSP Communication Basics • Run ARM & DSP Communication Example TI Information – Selective Disclosure 2

Ways for ARM and DSP Communication • Use common flags for communication − Set some flags or signs as the public interface − Communicates depends on flags/signs’ value change • Use Navigator for communication − Descriptors carry messages/values to be passed − Use QMSS to pass descriptors between different queues − Cores push/pop related queues to send/receive message descriptors • Use IPC for communication − Initialize the interrupt sub-system − Set source and trigger the dedicated IPCGR register − Related core received interrupt and react TI Information – Selective Disclosure 3

Advantage and Disadvantage Analysis • Use common flags for communication − A: Easiest way to implement communication, no extra IP usage − D: Spin lock implement by SW, need maintain Cache if used − D: Core will be occupied when posting/pending flags • Use Navigator for communication − A: Message sending/receiving by HW − D: Need to initialize Navigator HW, need maintain Cache if used − D: Core will be occupied when posting/pending descriptors if no interrupt used • Use IPC for communication − A: Latency is short due to use interrupt directly − A: No Core occupation before trigger/response IPC − D: Need to initialize interrupt controller HW, need maintain Cache if used TI Information – Selective Disclosure 4

Agenda • ARM and DSP Communication Basics • Run ARM & DSP Communication Example TI Information – Selective Disclosure 5

ARM & DSP Communication Example Procedure TI Information – Selective Disclosure 6

Run ARM & DSP Communication Example 1) Create TCI 6638 EVM CCXML file with loading attached GEL file on DSP Core 0 2) Launch the debug session with this CCXML configuration file 3) Connect and load the DSP executable on DSP Core 0 4) Connect and Load the ARM executable on ARM Core 0 5) Run the DSP executable first then run the ARM executable For more information, please refer operation guide on deyisupport: http: //www. deyisupport. com/ TI Information – Selective Disclosure 7

Thank You! TI Information – Selective Disclosure