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50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
///////////////////////////////////////////////////////////////////////
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// sd.h
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//
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// Written: Jaocb Pease jacob.pease@okstate.edu 7/22/2024
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//
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// Purpose: Header file for SD card protocol functions. Defines some
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// useful macros.
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//
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//
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//
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// A component of the Wally configurable RISC-V project.
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//
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// Copyright (C) 2021-23 Harvey Mudd College & Oklahoma State University
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//
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// SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
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//
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// Licensed under the Solderpad Hardware License v 2.1 (the
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// “License”); you may not use this file except in compliance with the
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// License, or, at your option, the Apache License version 2.0. You
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// may obtain a copy of the License at
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//
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// https://solderpad.org/licenses/SHL-2.1/
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//
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// Unless required by applicable law or agreed to in writing, any work
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// distributed under the License is distributed on an “AS IS” BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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///////////////////////////////////////////////////////////////////////
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#pragma once
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#include <stdint.h>
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// Command names
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#define SD_CMD_STOP_TRANSMISSION 12
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#define SD_CMD_READ_BLOCK_MULTIPLE 18
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#define SD_DATA_TOKEN 0xfe
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// Response lengths in bytes
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#define R1_RESPONSE 1
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#define R7_RESPONSE 5
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#define R1B_RESPONSE 2
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uint8_t crc7(uint8_t prev, uint8_t in);
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uint16_t crc16(uint16_t crc, uint8_t data);
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uint64_t sd_cmd(uint8_t cmd, uint32_t arg, uint8_t crc);
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uint64_t sd_read64(uint16_t * crc);
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int init_sd(uint32_t freq, uint32_t sdclk);
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