Hi,
we are currently testing the MIMXRT1180-EVK.
For some reason, the evkmimxrt1180_semc_cm33 SDK example fails, i.e., it prints:
From other posts, I have seen that the init code might use wrong timing information:
status_t BOARD_InitSEMC(void)
{
semc_config_t config;
semc_sdram_config_t sdramconfig;
uint32_t clockFrq = EXAMPLE_SEMC_CLK_FREQ;
/* Initializes the MAC configure structure to zero. */
memset(&config, 0, sizeof(semc_config_t));
memset(&sdramconfig, 0, sizeof(semc_sdram_config_t));
/* Initialize SEMC. */
SEMC_GetDefaultConfig(&config);
config.dqsMode = kSEMC_Loopbackdqspad; /* For more accurate timing. */
SEMC_Init(SEMC, &config);
/* Configure SDRAM. */
sdramconfig.csxPinMux = kSEMC_MUXCSX0;
sdramconfig.address = 0x80000000;
sdramconfig.memsize_kbytes = 32 * 1024; /* 64MB = 2*32*1024*1KBytes*/
sdramconfig.portSize = kSEMC_PortSize16Bit; /*two 16-bit SDRAMs make up 32-bit portsize*/
sdramconfig.burstLen = kSEMC_Sdram_BurstLen8;
sdramconfig.columnAddrBitNum = kSEMC_SdramColunm_9bit;
sdramconfig.casLatency = kSEMC_LatencyThree;
sdramconfig.tPrecharge2Act_Ns = 15; /* tRP 15ns */
sdramconfig.tAct2ReadWrite_Ns = 15; /* tRCD 15ns */
sdramconfig.tRefreshRecovery_Ns = 70; /* Use the maximum of the (Trfc , Txsr). */
sdramconfig.tWriteRecovery_Ns = 2; /* tWR 2ns */
sdramconfig.tCkeOff_Ns =
42; /* The minimum cycle of SDRAM CLK off state. CKE is off in self refresh at a minimum period tRAS.*/
sdramconfig.tAct2Prechage_Ns = 40; /* tRAS 40ns */
sdramconfig.tSelfRefRecovery_Ns = 70;
sdramconfig.tRefresh2Refresh_Ns = 60;
sdramconfig.tAct2Act_Ns = 2;
sdramconfig.tPrescalePeriod_Ns = 160 * (1000000000 / clockFrq);
sdramconfig.refreshPeriod_nsPerRow = 64 * 1000000 / 8192; /* 64ms/8192 */
sdramconfig.refreshUrgThreshold = sdramconfig.refreshPeriod_nsPerRow;
sdramconfig.refreshBurstLen = 1;
sdramconfig.delayChain = 2;
return SEMC_ConfigureSDRAM(SEMC, kSEMC_SDRAM_CS0, &sdramconfig, clockFrq);
}
On the board is a W9825G6KH-J5. From the data sheet, i do not really see an issue with the parameters.
Any suggestions what could be the reason that the out-of-the-box SDK example fails?
Background is we want to use the SDRAM for FreeRTOS heap, debugging boiling it down that the SDRAM is not correctly initialized / writable, which is confirmed by the SDK example.
(Reposted in the correct forum; delete the other post)
