/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2021 Philipp Ebensberger * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #if MICROPY_HW_SDRAM_AVAIL #include "modmachine.h" #include "fsl_semc.h" #include "fsl_iomuxc.h" // Linker symbols extern uint8_t __sdram_start; void mimxrt_sdram_init(void) { // Set Clocks CLOCK_InitSysPfd(kCLOCK_Pfd2, 29); // '29' PLL2 PFD2 frequency = 528MHz * 18 / 29 = 327.72MHz (with 528MHz = PLL2 frequency) CLOCK_SetMux(kCLOCK_SemcAltMux, 0); // '0' PLL2 PFD2 will be selected as alternative clock for SEMC root clock CLOCK_SetMux(kCLOCK_SemcMux, 1); // '1' SEMC alternative clock will be used as SEMC clock root CLOCK_SetDiv(kCLOCK_SemcDiv, 1); // '1' divide by 2 -> SEMC clock = 163.86 MHz // Set Pins // Data Pins IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA00, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA00, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA01, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA01, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA02, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA02, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA03, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA03, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA04, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA04, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA05, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA05, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA06, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA06, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA07, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA07, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA08, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA08, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA09, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA09, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA10, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA10, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA11, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA11, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA12, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA12, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA13, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA13, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA14, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA14, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DATA15, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DATA15, 0xE1UL); // Address Pins IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR00, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR00, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR01, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR01, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR02, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR02, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR03, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR03, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR04, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR04, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR05, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR05, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR06, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR06, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR07, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR07, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR08, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR08, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR09, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR09, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR10, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR10, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR11, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR11, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_ADDR12, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_ADDR12, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DM00, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DM00, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_BA0, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_BA0, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_BA1, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_BA1, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_CAS, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_CAS, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_RAS, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_RAS, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_CLK, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_CLK, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_CKE, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_CKE, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_WE, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_WE, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DM01, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DM01, 0xE1UL); IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_DQS, 1UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_DQS, 0xE1UL); // Chip Select Pins #ifndef MIMXRT_IOMUXC_SEMC_CS0 #error No SEMC CS0 defined! #endif IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_CS0, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_CS0, 0xE1UL); #ifdef MIMXRT_IOMUXC_SEMC_CS1 IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_CS1, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_CS1, 0xE1UL); #endif #ifdef MIMXRT_IOMUXC_SEMC_CS2 IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_CS2, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_CS2, 0xE1UL); #endif #ifdef MIMXRT_IOMUXC_SEMC_CS3 IOMUXC_SetPinMux(MIMXRT_IOMUXC_SEMC_CS3, 0UL); IOMUXC_SetPinConfig(MIMXRT_IOMUXC_SEMC_CS3, 0xE1UL); #endif // Configure SEMC semc_config_t semc_cfg; SEMC_GetDefaultConfig(&semc_cfg); semc_cfg.dqsMode = kSEMC_Loopbackdqspad; // For more accurate timing. SEMC_Init(SEMC, &semc_cfg); uint32_t clock_freq = CLOCK_GetFreq(kCLOCK_SemcClk); semc_sdram_config_t sdram_cfg = { .csxPinMux = kSEMC_MUXCSX0, .address = ((uint32_t)&__sdram_start), .memsize_kbytes = (MICROPY_HW_SDRAM_SIZE >> 10), // Right shift by 10 == division by 1024 .portSize = kSEMC_PortSize16Bit, .burstLen = kSEMC_Sdram_BurstLen1, .columnAddrBitNum = kSEMC_SdramColunm_9bit, .casLatency = kSEMC_LatencyThree, .tPrecharge2Act_Ns = 18, // Trp 18ns .tAct2ReadWrite_Ns = 18, // Trcd 18ns .tRefreshRecovery_Ns = (60 + 67), .tWriteRecovery_Ns = 12, // 12ns .tCkeOff_Ns = 42, // The minimum cycle of SDRAM CLK off state. CKE is off in self refresh at a minimum period tRAS. .tAct2Prechage_Ns = 42, // Tras 42ns .tSelfRefRecovery_Ns = 67, .tRefresh2Refresh_Ns = 60, .tAct2Act_Ns = 60, .tPrescalePeriod_Ns = 160 * (1000000000 / clock_freq), .tIdleTimeout_Ns = 0UL, .refreshPeriod_nsPerRow = 64 * 1000000 / 8192, // 64ms/8192 .refreshUrgThreshold = 64 * 1000000 / 8192, // 64ms/8192 .refreshBurstLen = 1 }; (status_t)SEMC_ConfigureSDRAM(SEMC, kSEMC_SDRAM_CS0, &sdram_cfg, clock_freq); } #endif