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