On top of the DSS core, we start by initializing and configuring the mmWave and Device drivers of the core accordingly.
We start by initiazizing the data path object for signal processing flow.
The first part of main()is used by the application ,on top of the DSS core, to perform its one-time-only application-specific initializations. Once that is completed, BIOS_start() marks the beginning of the application's operational functioning.
The system flow inside the
mainis as follow:
/* MAIN */
DSS_DataPathObj* obj = &gMCB.dataPathObj[0];
memset((void *) obj, 0, sizeof(DSS_DataPathObj));
/** @brief
* Populate the system configuration [SRR, MRR or LRR]
*/
DSS_dataPathConfigPopulate(obj);
/** @brief
* Initializes states counters used for 1D-FFT processing.
*/
DSS_dataPathInit1Dstate(obj);
/** @brief
* EDMA Initialization
*/
DSS_dataPathInitEdma(obj);
/** @brief
* Copy linker generated table code from L3 Shared RAM to the DSS L1PSRAM using EDMA.
* L1SPRAM supports parity. Hence, parity diagnostic on DSP’s L1P memory is reported to the CPU
* as an interrupt in case of an error.
* This is used to page in fast code from L3 to L1PSRAM.
*/
DSS_copyTable(obj->edmaHandle[EDMA_INSTANCE_DSS], &L1PSRAM_copy_table);
/** @brief
* Initialize the SOC Module.
*/
SOC_init(&socCfg, &errCode);
/** @brief
* Initialize the Task Parameters.
*/
Task_create(DSS_mmWaveInitTASK, &taskParams, NULL);
/** @brief
* Start BIOS.
* In SYS/BIOS, BIOS_start() starts up task threads which then take over the application's flow of execution.
* Hence, the function doesn't return.
*/
BIOS_start();Populate the chirp configuration in the DSS for the data path object by invoking DSS_dataPathConfigPopulate(obj). Hence, the function is a hierarchical encapsulation to customize the design requirements accoroding to the use case either short, medium or long range radar (srr, mrr, or lrr). Therefore, DSS_populateSRR(obj, 0), DSS_populateMRR(obj, 0), or DSS_populateMRR(obj, 0) is called to populate the data path object array with the appropriate configuration.
void DSS_dataPathConfigPopulate(DSS_DataPathObj* obj)
{
#ifdef SUBFRAME_CONF_MRR
DSS_populateSRR(obj, subframeIndx);
#endif
#ifdef SUBFRAME_CONF_USRR
DSS_populateMRR(obj, subframeIndx);
#endif
#ifdef SUBFRAME_CONF_LRR
DSS_populateLRR(obj, subframeIndx);
#endif
}