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micropython/ports/mimxrt/sdcard.c

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/*
* 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_PY_MACHINE_SDCARD
#include "sdcard.h"
#include "ticks.h"
#include "fsl_iomuxc.h"
#define SDCARD_VOLTAGE_WINDOW_SD (0x80100000U)
#define SDCARD_HIGH_CAPACITY (0x40000000U)
#define SDCARD_SWITCH_1_8V_CAPACITY ((uint32_t)0x01000000U)
#define SDCARD_MAX_VOLT_TRIAL ((uint32_t)0x000000FFU)
// Error
#define SDCARD_STATUS_OUT_OF_RANGE_SHIFT (31U)
#define SDCARD_STATUS_ADDRESS_ERROR_SHIFT (30U)
#define SDCARD_STATUS_BLOCK_LEN_ERROR_SHIFT (29U)
#define SDCARD_STATUS_ERASE_SEQ_ERROR_SHIFT (28U)
#define SDCARD_STATUS_ERASE_PARAM_SHIFT (27U)
#define SDCARD_STATUS_WP_VIOLATION_SHIFT (26U)
#define SDCARD_STATUS_LOCK_UNLOCK_FAILED_SHIFT (24U)
#define SDCARD_STATUS_COM_CRC_ERROR_SHIFT (23U)
#define SDCARD_STATUS_ILLEGAL_COMMAND_SHIFT (22U)
#define SDCARD_STATUS_CARD_ECC_FAILED_SHIFT (21U)
#define SDCARD_STATUS_CC_ERROR_SHIFT (20U)
#define SDCARD_STATUS_ERROR_SHIFT (19U)
#define SDCARD_STATUS_CSD_OVERWRITE_SHIFT (16U)
#define SDCARD_STATUS_WP_ERASE_SKIP_SHIFT (15U)
#define SDCARD_STATUS_AUTH_SEQ_ERR_SHIFT (3U)
// Status Flags
#define SDCARD_STATUS_CARD_IS_LOCKED_SHIFT (25U)
#define SDCARD_STATUS_CARD_ECC_DISABLED_SHIFT (14U)
#define SDCARD_STATUS_ERASE_RESET_SHIFT (13U)
#define SDCARD_STATUS_READY_FOR_DATA_SHIFT (8U)
#define SDCARD_STATUS_FX_EVENT_SHIFT (6U)
#define SDCARD_STATUS_APP_CMD_SHIFT (5U)
#define SDMMC_MASK(bit) (1U << (bit))
#define SDMMC_R1_ALL_ERROR_FLAG \
(SDMMC_MASK(SDCARD_STATUS_OUT_OF_RANGE_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_ADDRESS_ERROR_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_BLOCK_LEN_ERROR_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_ERASE_SEQ_ERROR_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_ERASE_PARAM_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_WP_VIOLATION_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_LOCK_UNLOCK_FAILED_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_COM_CRC_ERROR_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_ILLEGAL_COMMAND_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_CARD_ECC_FAILED_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_CC_ERROR_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_ERROR_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_CSD_OVERWRITE_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_WP_ERASE_SKIP_SHIFT)) | \
(SDMMC_MASK(SDCARD_STATUS_AUTH_SEQ_ERR_SHIFT))
#define SDMMC_R1_CURRENT_STATE(x) (((x) & 0x00001E00U) >> 9U)
// ---
// SD Card command identifiers
// ---
enum
{
SDCARD_CMD_GO_IDLE_STATE = 0U,
SDCARD_CMD_ALL_SEND_CID = 2U,
SDCARD_CMD_SEND_REL_ADDR = 3U,
SDCARD_CMD_SET_DSR = 4U,
SDCARD_CMD_SELECT_CARD = 7U,
SDCARD_CMD_SEND_IF_COND = 8U,
SDCARD_CMD_SEND_CSD = 9U,
SDCARD_CMD_SEND_CID = 10U,
SDCARD_CMD_STOP_TRANSMISSION = 12U,
SDCARD_CMD_SEND_STATUS = 13U,
SDCARD_CMD_GO_INACTIVE_STATE = 15U,
SDCARD_CMD_SET_BLOCKLENGTH = 16U,
SDCARD_CMD_READ_SINGLE_BLOCK = 17U,
SDCARD_CMD_READ_MULTIPLE_BLOCK = 18U,
SDCARD_CMD_SET_BLOCK_COUNT = 23U,
SDCARD_CMD_WRITE_SINGLE_BLOCK = 24U,
SDCARD_CMD_WRITE_MULTIPLE_BLOCK = 25U,
SDCARD_CMD_PROGRAM_CSD = 27U,
SDCARD_CMD_SET_WRITE_PROTECT = 28U,
SDCARD_CMD_CLEAR_WRITE_PROTECT = 29U,
SDCARD_CMD_SEND_WRITE_PROTECT = 30U,
SDCARD_CMD_ERASE = 38U,
SDCARD_CMD_LOCK_UNLOCK = 42U,
SDCARD_CMD_APP_CMD = 55U,
SDCARD_CMD_GEN_CMD = 56U,
SDCARD_CMD_READ_OCR = 58U,
};
// ---
// SD Card application command identifiers
// ---
enum
{
SDCARD_ACMD_SET_BUS_WIDTH = 6U,
SDCARD_ACMD_SD_SEND_OP_COND = 41U,
};
// ---
// SD Card state identifiers
// ---
enum
{
SDCARD_STATE_IDLE = 0U,
SDCARD_STATE_READY = 1U,
SDCARD_STATE_IDENTIFY = 2U,
SDCARD_STATE_STANDBY = 3U,
SDCARD_STATE_TRANSFER = 4U,
SDCARD_STATE_SENDDATA = 5U,
SDCARD_STATE_RECEIVEDATA = 6U,
SDCARD_STATE_PROGRAM = 7U,
SDCARD_STATE_DISCONNECT = 8U,
};
// ---
// SD Card transfer status
// ---
typedef enum
{
SDCARD_TRANSFER_SUCCESS = 0,
SDCARD_TRANSFER_ERROR,
SDCARD_TRANSFER_PENDING
} sdcard_transfer_status_t;
// ---
// SD Card type definitions
// ---
typedef struct _cid_t {
uint8_t reserved_0;
uint16_t mdt : 12;
uint16_t reserved_1 : 4;
uint32_t psn;
uint8_t prv;
char pnm[6];
uint16_t oid;
uint8_t mid;
} __attribute__((packed)) cid_t;
typedef struct _csd_t {
uint32_t data[4];
} __attribute__((packed)) csd_t;
typedef struct _csr_t {
uint32_t data[2];
} __attribute__((packed)) csr_t;
#define DMA_DESCRIPTOR_BUFFER_SIZE (32U)
#define DMA_DESCRIPTOR_BUFFER_ALIGN_SIZE (4U)
AT_NONCACHEABLE_SECTION_ALIGN(static uint32_t sdcard_adma_descriptor_table[DMA_DESCRIPTOR_BUFFER_SIZE], DMA_DESCRIPTOR_BUFFER_ALIGN_SIZE);
#if defined MICROPY_USDHC1 && USDHC1_AVAIL
const mimxrt_sdcard_obj_pins_t mimxrt_sdcard_1_obj_pins = MICROPY_USDHC1;
#endif
#if defined MICROPY_USDHC2 && USDHC2_AVAIL
const mimxrt_sdcard_obj_pins_t mimxrt_sdcard_2_obj_pins = MICROPY_USDHC2;
#endif
#if defined MICROPY_USDHC1 && USDHC1_AVAIL
mimxrt_sdcard_status_obj_t sdcard_usdhc1_state = {.initialized = false, .inserted = false};
#endif
#if defined MICROPY_USDHC2 && USDHC2_AVAIL
mimxrt_sdcard_status_obj_t sdcard_usdhc2_state = {.initialized = false, .inserted = false};
#endif
mimxrt_sdcard_obj_t mimxrt_sdcard_objs[] =
{
#if defined MICROPY_USDHC1 && USDHC1_AVAIL
{
.base.type = &machine_sdcard_type,
.usdhc_inst = USDHC1,
.state = &sdcard_usdhc1_state,
.rca = 0x0UL,
.block_len = SDCARD_DEFAULT_BLOCK_SIZE,
.block_count = 0UL,
.pins = &mimxrt_sdcard_1_obj_pins,
},
#endif
#if defined MICROPY_USDHC2 && USDHC2_AVAIL
{
.base.type = &machine_sdcard_type,
.usdhc_inst = USDHC2,
.state = &sdcard_usdhc2_state,
.rca = 0x0UL,
.block_len = SDCARD_DEFAULT_BLOCK_SIZE,
.block_count = 0UL,
.pins = &mimxrt_sdcard_2_obj_pins,
};
#endif
};
volatile status_t sdcard_transfer_status;
volatile bool sdcard_transfer_done;
// ---
// Local function declarations
// ---
static status_t sdcard_transfer_blocking(USDHC_Type *base,
usdhc_handle_t *handle,
usdhc_transfer_t *transfer,
uint32_t timeout_ms);
static void sdcard_decode_csd(mimxrt_sdcard_obj_t *sdcard, csd_t *csd);
static bool sdcard_reset(mimxrt_sdcard_obj_t *card);
static inline void sdcard_init_pin(const machine_pin_obj_t *pin, uint8_t af_idx, uint32_t config_value);
// SD Card interrupt callbacks
void sdcard_card_inserted_callback(USDHC_Type *base, void *userData);
void sdcard_card_removed_callback(USDHC_Type *base, void *userData);
void sdcard_transfer_complete_callback(USDHC_Type *base, usdhc_handle_t *handle, status_t status, void *userData);
void sdcard_dummy_callback(USDHC_Type *base, void *userData);
// SD Card commmands
static bool sdcard_cmd_go_idle_state(mimxrt_sdcard_obj_t *card);
static bool sdcard_cmd_oper_cond(mimxrt_sdcard_obj_t *card);
static bool sdcard_cmd_app_cmd(mimxrt_sdcard_obj_t *card);
static bool sdcard_cmd_sd_app_op_cond(mimxrt_sdcard_obj_t *card, uint32_t argument);
static bool sdcard_cmd_all_send_cid(mimxrt_sdcard_obj_t *card, cid_t *cid);
static bool sdcard_cmd_send_cid(mimxrt_sdcard_obj_t *card, cid_t *cid);
static bool sdcard_cmd_set_rel_add(mimxrt_sdcard_obj_t *card);
static bool sdcard_cmd_send_csd(mimxrt_sdcard_obj_t *card, csd_t *csd);
static bool sdcard_cmd_select_card(mimxrt_sdcard_obj_t *sdcard);
static bool sdcard_cmd_set_blocklen(mimxrt_sdcard_obj_t *sdcard);
static bool sdcard_cmd_set_bus_width(mimxrt_sdcard_obj_t *sdcard, uint8_t bus_width);
void sdcard_card_inserted_callback(USDHC_Type *base, void *userData) {
#if defined MICROPY_USDHC1 && USDHC1_AVAIL
if (base == USDHC1) {
sdcard_usdhc1_state.inserted = true;
}
#endif
#if defined MICROPY_USDHC2 && USDHC2_AVAIL
if (base == USDHC2) {
sdcard_usdhc2_state.inserted = true;
}
#endif
USDHC_ClearInterruptStatusFlags(base, kUSDHC_CardInsertionFlag);
}
void sdcard_card_removed_callback(USDHC_Type *base, void *userData) {
#if defined MICROPY_USDHC1 && USDHC1_AVAIL
if (base == USDHC1) {
sdcard_usdhc1_state.inserted = false;
sdcard_usdhc1_state.initialized = false;
}
#endif
#if defined MICROPY_USDHC2 && USDHC2_AVAIL
if (base == USDHC2) {
sdcard_usdhc2_state.inserted = false;
sdcard_usdhc2_state.initialized = false;
}
#endif
USDHC_ClearInterruptStatusFlags(base, kUSDHC_CardRemovalFlag);
}
void sdcard_transfer_complete_callback(USDHC_Type *base, usdhc_handle_t *handle, status_t status, void *userData) {
sdcard_transfer_status = status;
sdcard_transfer_done = true;
USDHC_ClearInterruptStatusFlags(base, kUSDHC_CommandCompleteFlag | kUSDHC_DataCompleteFlag);
}
void sdcard_dummy_callback(USDHC_Type *base, void *userData) {
return;
}
static status_t sdcard_transfer_blocking(USDHC_Type *base, usdhc_handle_t *handle, usdhc_transfer_t *transfer, uint32_t timeout_ms) {
uint32_t retry_ctr = 0UL;
status_t status;
usdhc_adma_config_t dma_config;
(void)memset(&dma_config, 0, sizeof(usdhc_adma_config_t));
dma_config.dmaMode = kUSDHC_DmaModeAdma2;
dma_config.burstLen = kUSDHC_EnBurstLenForINCR;
dma_config.admaTable = sdcard_adma_descriptor_table;
dma_config.admaTableWords = DMA_DESCRIPTOR_BUFFER_SIZE;
do {
status = USDHC_TransferNonBlocking(base, handle, &dma_config, transfer);
retry_ctr++;
} while (!(status == kStatus_Success) && (retry_ctr < 1000000UL));
if (status == kStatus_Success) {
for (int i = 0; i < timeout_ms * 100; i++) {
if ((sdcard_transfer_done == true) && (sdcard_transfer_status == kStatus_Success)) {
sdcard_transfer_done = false;
return kStatus_Success;
}
ticks_delay_us64(10);
}
return kStatus_Timeout;
} else {
return status;
}
}
static void sdcard_decode_csd(mimxrt_sdcard_obj_t *card, csd_t *csd) {
uint8_t csd_structure = 0x3 & (csd->data[3] >> 30);
uint8_t read_bl_len;
uint32_t c_size;
uint8_t c_size_mult;
switch (csd_structure)
{
case 0: {
read_bl_len = 0xF & (csd->data[2] >> 16);
c_size = ((0x3FF & csd->data[2]) << 30) | (0x3 & (csd->data[1] >> 30));
c_size_mult = 0x7 & (csd->data[1] >> 15);
card->block_len = (1U << (read_bl_len));
card->block_count = ((c_size + 1U) << (c_size_mult + 2U));
if (card->block_len != SDCARD_DEFAULT_BLOCK_SIZE) {
card->block_count = (card->block_count * card->block_len);
card->block_len = SDCARD_DEFAULT_BLOCK_SIZE;
card->block_count = (card->block_count / card->block_len);
}
break;
}
case 1: {
c_size = ((0x3F & csd->data[2]) << 16) | (0xFFFF & (csd->data[1] >> 16));
card->block_len = 512UL;
card->block_count = (uint32_t)(((uint64_t)(c_size + 1U) * (uint64_t)1024UL));
break;
}
case 2: {
c_size = ((0xFF & csd->data[2]) << 16) | (0xFFFF & (csd->data[1] >> 16));
card->block_len = 512UL;
card->block_count = (uint32_t)(((uint64_t)(c_size + 1U) * (uint64_t)1024UL));
break;
}
default: {
break;
}
}
}
static bool sdcard_cmd_go_idle_state(mimxrt_sdcard_obj_t *card) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_GO_IDLE_STATE,
.argument = 0UL,
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeNone,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
return true;
} else {
return false;
}
}
static bool sdcard_cmd_oper_cond(mimxrt_sdcard_obj_t *card) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_SEND_IF_COND,
.argument = 0x000001AAU, // 2.7-3.3V range and 0xAA check pattern
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR7,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
card->oper_cond = command.response[0];
return true;
} else {
return false;
}
}
static bool sdcard_cmd_app_cmd(mimxrt_sdcard_obj_t *card) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_APP_CMD,
.argument = (card->rca << 16),
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR1,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
card->status = command.response[0];
return true;
} else {
return false;
}
}
static bool sdcard_cmd_sd_app_op_cond(mimxrt_sdcard_obj_t *card, uint32_t argument) {
if (!sdcard_cmd_app_cmd(card)) {
return false;
}
status_t status;
usdhc_command_t command = {
.index = SDCARD_ACMD_SD_SEND_OP_COND,
.argument = argument,
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR3,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
card->oper_cond = command.response[0];
return true;
} else {
return false;
}
}
static bool sdcard_cmd_all_send_cid(mimxrt_sdcard_obj_t *card, cid_t *cid) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_ALL_SEND_CID,
.argument = 0UL,
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR2,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
cid->mdt = (uint16_t)((command.response[0] & 0xFFF00U) >> 8U);
cid->psn = (uint32_t)(((command.response[1] & 0xFFFFFFU) << 8U) | ((command.response[0] & 0xFF000000U) >> 24U));
cid->prv = (uint8_t)((command.response[1] & 0xFF000000U) >> 24U);
cid->pnm[0] = (char)(command.response[2] & 0xFFU);
cid->pnm[1] = (char)((command.response[2] & 0xFF00U) >> 8U);
cid->pnm[2] = (char)((command.response[2] & 0xFF0000U) >> 16U);
cid->pnm[3] = (char)((command.response[2] & 0xFF000000U) >> 24U);
cid->pnm[4] = (char)(command.response[3] & 0xFFU);
cid->pnm[5] = '\0';
cid->oid = (uint16_t)((command.response[3] & 0xFFFF00U) >> 8U);
cid->mid = (uint8_t)((command.response[3] & 0xFF000000U) >> 24U);
return true;
} else {
return false;
}
}
static bool sdcard_cmd_send_cid(mimxrt_sdcard_obj_t *card, cid_t *cid) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_SEND_CID,
.argument = (card->rca << 16),
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR2,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
cid->mdt = (uint16_t)((command.response[0] & 0xFFF00U) >> 8U);
cid->psn = (uint32_t)(((command.response[1] & 0xFFFFFFU) << 8U) | ((command.response[0] & 0xFF000000U) >> 24U));
cid->prv = (uint8_t)((command.response[1] & 0xFF000000U) >> 24U);
cid->pnm[0] = (char)(command.response[2] & 0xFFU);
cid->pnm[1] = (char)((command.response[2] & 0xFF00U) >> 8U);
cid->pnm[2] = (char)((command.response[2] & 0xFF0000U) >> 16U);
cid->pnm[3] = (char)((command.response[2] & 0xFF000000U) >> 24U);
cid->pnm[4] = (char)(command.response[3] & 0xFFU);
cid->pnm[5] = '\0';
cid->oid = (uint16_t)((command.response[3] & 0xFFFF00U) >> 8U);
cid->mid = (uint8_t)((command.response[3] & 0xFF000000U) >> 24U);
return true;
} else {
return false;
}
}
static bool sdcard_cmd_set_rel_add(mimxrt_sdcard_obj_t *card) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_SEND_REL_ADDR,
.argument = 0UL,
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR6,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
card->rca = 0xFFFFFFFF & (command.response[0] >> 16);
return true;
} else {
return false;
}
}
static bool sdcard_cmd_send_csd(mimxrt_sdcard_obj_t *card, csd_t *csd) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_SEND_CSD,
.argument = (card->rca << 16),
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR2,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
csd->data[0] = command.response[0];
csd->data[1] = command.response[1];
csd->data[2] = command.response[2];
csd->data[3] = command.response[3];
return true;
} else {
return false;
}
}
static bool sdcard_cmd_select_card(mimxrt_sdcard_obj_t *card) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_SELECT_CARD,
.argument = (card->rca << 16),
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR1b,
.responseErrorFlags = SDMMC_R1_ALL_ERROR_FLAG,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
card->status = command.response[0];
return true;
} else {
return false;
}
}
static bool sdcard_cmd_set_blocklen(mimxrt_sdcard_obj_t *card) {
status_t status;
usdhc_command_t command = {
.index = SDCARD_CMD_SET_BLOCKLENGTH,
.argument = card->block_len,
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR1,
.responseErrorFlags = SDMMC_R1_ALL_ERROR_FLAG,
};
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
card->status = command.response[0];
return true;
} else {
return false;
}
}
static bool sdcard_cmd_set_bus_width(mimxrt_sdcard_obj_t *card, usdhc_data_bus_width_t bus_width) {
if (!sdcard_cmd_app_cmd(card)) {
return false;
}
status_t status;
usdhc_command_t command = {
.index = SDCARD_ACMD_SET_BUS_WIDTH,
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR1,
};
if (bus_width == kUSDHC_DataBusWidth1Bit) {
command.argument = 0U;
} else if (bus_width == kUSDHC_DataBusWidth4Bit) {
command.argument = 2U;
} else {
return false; // Invalid argument
}
usdhc_transfer_t transfer = {
.data = NULL,
.command = &command,
};
status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 250);
if (status == kStatus_Success) {
card->status = command.response[0];
return true;
} else {
return false;
}
}
static bool sdcard_reset(mimxrt_sdcard_obj_t *card) {
card->block_len = SDCARD_DEFAULT_BLOCK_SIZE;
card->rca = 0UL;
card->block_count = 0UL;
card->status = 0UL;
card->oper_cond = 0UL;
card->state->initialized = false;
return USDHC_Reset(card->usdhc_inst, (USDHC_SYS_CTRL_RSTA_MASK | USDHC_SYS_CTRL_RSTC_MASK | USDHC_SYS_CTRL_RSTD_MASK), 2048);
}
void sdcard_init(mimxrt_sdcard_obj_t *card, uint32_t base_clk) {
// Configure PFD0 of PLL2 (system PLL) fractional divider to 24 resulting in:
// with PFD0_clk = PLL2_clk * 18 / N
// PFD0_clk = 528MHz * 18 / 24 = 396MHz
CLOCK_InitSysPfd(kCLOCK_Pfd0, 24U);
#if defined MICROPY_USDHC1 && USDHC1_AVAIL
// Configure USDHC clock source and divider
CLOCK_SetDiv(kCLOCK_Usdhc1Div, 1U); // USDHC_input_clk = PFD0_clk / 2 = 198MHZ
CLOCK_SetMux(kCLOCK_Usdhc1Mux, 1U); // Select PFD0 as clock input for USDHC
#endif
#if defined MICROPY_USDHC2 && USDHC2_AVAIL
// Configure USDHC clock source and divider
CLOCK_SetDiv(kCLOCK_Usdhc2Div, 1U); // USDHC_input_clk = PFD0_clk / 2 = 198MHZ
CLOCK_SetMux(kCLOCK_Usdhc2Mux, 1U); // Select PFD0 as clock input for USDHC
#endif
// Initialize USDHC
const usdhc_config_t config = {
.endianMode = kUSDHC_EndianModeLittle,
.dataTimeout = 0xFU,
.readWatermarkLevel = 128U,
.writeWatermarkLevel = 128U,
};
USDHC_Init(card->usdhc_inst, &config);
(void)sdcard_reset(card);
card->base_clk = base_clk;
usdhc_transfer_callback_t callbacks = {
.CardInserted = sdcard_card_inserted_callback,
.CardRemoved = sdcard_card_removed_callback,
.SdioInterrupt = sdcard_dummy_callback,
.BlockGap = sdcard_dummy_callback,
.TransferComplete = sdcard_transfer_complete_callback,
.ReTuning = sdcard_dummy_callback,
};
USDHC_TransferCreateHandle(card->usdhc_inst, &card->handle, &callbacks, NULL);
}
void sdcard_deinit(mimxrt_sdcard_obj_t *card) {
sdcard_power_off(card);
USDHC_Deinit(card->usdhc_inst);
}
static inline void sdcard_init_pin(const machine_pin_obj_t *pin, uint8_t af_idx, uint32_t config_value) {
machine_pin_af_obj_t af = pin->af_list[af_idx];
IOMUXC_SetPinMux(pin->muxRegister, af.af_mode, af.input_register, af.input_daisy, pin->configRegister, 0U);
IOMUXC_SetPinConfig(pin->muxRegister, af.af_mode, af.input_register, af.input_daisy, pin->configRegister, config_value);
}
void sdcard_init_pins(mimxrt_sdcard_obj_t *card) {
// speed and strength optimized for clock frequency < 100MHz
const mimxrt_sdcard_obj_pins_t *pins = card->pins;
uint32_t default_config = pin_generate_config(
PIN_PULL_UP_47K, PIN_MODE_SKIP, PIN_DRIVE_6, card->pins->clk.pin->configRegister);
#if USDHC_DATA3_PULL_DOWN_ON_BOARD
// Pull down on the board -> must not enable internal PD.
uint32_t no_cd_config = pin_generate_config(
PIN_PULL_DISABLED, PIN_MODE_SKIP, PIN_DRIVE_6, card->pins->data3.pin->configRegister);
#else
uint32_t no_cd_config = pin_generate_config(
PIN_PULL_DOWN_100K, PIN_MODE_SKIP, PIN_DRIVE_6, card->pins->data3.pin->configRegister);
#endif // USDHC_DATA3_PULL_DOWN_ON_BOARD
sdcard_init_pin(card->pins->clk.pin, card->pins->clk.af_idx, default_config); // USDHC1_CLK
sdcard_init_pin(card->pins->cmd.pin, card->pins->cmd.af_idx, default_config); // USDHC1_CMD
sdcard_init_pin(card->pins->data0.pin, card->pins->data0.af_idx, default_config); // USDHC1_DATA0
sdcard_init_pin(card->pins->data1.pin, card->pins->data1.af_idx, default_config); // USDHC1_DATA1
sdcard_init_pin(card->pins->data2.pin, card->pins->data2.af_idx, default_config); // USDHC1_DATA2
if (pins->cd_b.pin) {
sdcard_init_pin(card->pins->data3.pin, card->pins->data3.af_idx, default_config); // USDHC1_DATA3
sdcard_init_pin(card->pins->cd_b.pin, card->pins->cd_b.af_idx, default_config); // USDHC1_CD_B
USDHC_CardDetectByData3(card->usdhc_inst, false);
} else {
sdcard_init_pin(card->pins->data3.pin, card->pins->data3.af_idx, no_cd_config); // USDHC1_DATA3
USDHC_CardDetectByData3(card->usdhc_inst, true);
}
}
bool sdcard_read(mimxrt_sdcard_obj_t *card, uint8_t *buffer, uint32_t block_num, uint32_t block_count) {
if (!card->state->initialized) {
return false;
}
usdhc_data_t data = {
.enableAutoCommand12 = true,
.enableAutoCommand23 = false,
.enableIgnoreError = false,
.dataType = kUSDHC_TransferDataNormal,
.blockSize = card->block_len,
.blockCount = block_count,
.rxData = (uint32_t *)buffer,
.txData = NULL,
};
usdhc_command_t command = {
.index = (block_count == 1U) ? (uint32_t)SDCARD_CMD_READ_SINGLE_BLOCK : (uint32_t)SDCARD_CMD_READ_MULTIPLE_BLOCK,
.argument = block_num,
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR1,
.responseErrorFlags = SDMMC_R1_ALL_ERROR_FLAG,
};
usdhc_transfer_t transfer = {
.data = &data,
.command = &command,
};
status_t status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 500);
if (status == kStatus_Success) {
card->status = command.response[0];
return true;
} else {
return false;
}
}
bool sdcard_write(mimxrt_sdcard_obj_t *card, uint8_t *buffer, uint32_t block_num, uint32_t block_count) {
if (!card->state->initialized) {
return false;
}
usdhc_data_t data = {
.enableAutoCommand12 = true,
.enableAutoCommand23 = false,
.enableIgnoreError = false,
.dataType = kUSDHC_TransferDataNormal,
.blockSize = card->block_len,
.blockCount = block_count,
.rxData = NULL,
.txData = (uint32_t *)buffer,
};
usdhc_command_t command = {
.index = (block_count == 1U) ? (uint32_t)SDCARD_CMD_WRITE_SINGLE_BLOCK : (uint32_t)SDCARD_CMD_WRITE_MULTIPLE_BLOCK,
.argument = block_num,
.type = kCARD_CommandTypeNormal,
.responseType = kCARD_ResponseTypeR1,
.responseErrorFlags = SDMMC_R1_ALL_ERROR_FLAG,
};
usdhc_transfer_t transfer = {
.data = &data,
.command = &command,
};
status_t status = sdcard_transfer_blocking(card->usdhc_inst, &card->handle, &transfer, 3000);
if (status == kStatus_Success) {
card->status = command.response[0];
return true;
} else {
return false;
}
}
bool sdcard_set_active(mimxrt_sdcard_obj_t *card) {
return USDHC_SetCardActive(card->usdhc_inst, 8192);
}
bool sdcard_probe_bus_voltage(mimxrt_sdcard_obj_t *card) {
bool valid_voltage = false;
uint32_t count = 0UL;
bool status = false;
// Perform voltage validation
while ((count < SDCARD_MAX_VOLT_TRIAL) && (valid_voltage == false)) {
status = sdcard_cmd_sd_app_op_cond(card, (uint32_t)(SDCARD_VOLTAGE_WINDOW_SD |
SDCARD_HIGH_CAPACITY |
SDCARD_SWITCH_1_8V_CAPACITY));
if (status == false) {
return false;
}
/* Get operating voltage*/
valid_voltage = (((card->oper_cond >> 31U) == 1U) ? true : false);
count++;
ticks_delay_us64(1000);
}
if (count >= SDCARD_MAX_VOLT_TRIAL) {
return false;
} else {
return true;
}
}
bool sdcard_power_on(mimxrt_sdcard_obj_t *card) {
bool status = false;
// Check if card is already initialized and powered on
if (card->state->initialized) {
return true;
}
USDHC_SetDataBusWidth(card->usdhc_inst, kUSDHC_DataBusWidth1Bit);
card->bus_clk = USDHC_SetSdClock(card->usdhc_inst, card->base_clk, SDCARD_CLOCK_400KHZ);
// Start initialization process
status = sdcard_reset(card);
if (!status) {
return false;
}
status = sdcard_set_active(card);
if (!status) {
return false;
}
status = sdcard_cmd_go_idle_state(card);
if (!status) {
return false;
}
status = sdcard_cmd_oper_cond(card);
if (!status) {
return false;
}
status = sdcard_probe_bus_voltage(card);
if (!status) {
return false;
}
// ===
// Ready State
// ===
cid_t cid_all;
status = sdcard_cmd_all_send_cid(card, &cid_all);
if (!status) {
return false;
}
// ===
// Identification State
// ===
status = sdcard_cmd_set_rel_add(card);
if (!status) {
return false;
}
// ===
// Standby State
// ===
card->bus_clk = USDHC_SetSdClock(card->usdhc_inst, card->base_clk, SDCARD_CLOCK_50MHZ);
csd_t csd;
status = sdcard_cmd_send_csd(card, &csd);
if (!status) {
return false;
}
sdcard_decode_csd(card, &csd);
cid_t cid;
status = sdcard_cmd_send_cid(card, &cid);
if (!status) {
return false;
}
// ===
// Transfer State
// ===
status = sdcard_cmd_select_card(card);
if (!status) {
return false;
}
status = sdcard_cmd_set_blocklen(card);
if (!status) {
return false;
}
status = sdcard_cmd_set_bus_width(card, kUSDHC_DataBusWidth4Bit);
if (!status) {
return false;
}
USDHC_SetDataBusWidth(card->usdhc_inst, kUSDHC_DataBusWidth4Bit);
status = sdcard_cmd_set_blocklen(card);
if (!status) {
return false;
}
// Finialize initialization
card->state->initialized = true;
return true;
}
bool sdcard_power_off(mimxrt_sdcard_obj_t *card) {
(void)sdcard_cmd_go_idle_state(card);
// Reset card bus clock
USDHC_SetDataBusWidth(card->usdhc_inst, kUSDHC_DataBusWidth1Bit);
card->bus_clk = USDHC_SetSdClock(card->usdhc_inst, card->base_clk, SDCARD_CLOCK_400KHZ);
(void)sdcard_reset(card);
return true;
}
bool sdcard_detect(mimxrt_sdcard_obj_t *card) {
bool detect = false;
#if defined MICROPY_USDHC1 && USDHC1_AVAIL
if ((card->usdhc_inst == USDHC1) && (sdcard_usdhc1_state.inserted == true)) {
return true;
}
#endif
#if defined MICROPY_USDHC2 && USDHC2_AVAIL
if ((card->usdhc_inst == USDHC2) && (sdcard_usdhc2_state.inserted == true)) {
return true;
}
#endif
if (card->pins->cd_b.pin) {
detect = USDHC_DetectCardInsert(card->usdhc_inst);
} else {
USDHC_CardDetectByData3(card->usdhc_inst, true);
detect = (USDHC_GetPresentStatusFlags(card->usdhc_inst) & USDHC_PRES_STATE_DLSL(8)) != 0;
}
// Update card state when detected via pin state
#if defined MICROPY_USDHC1 && USDHC1_AVAIL
if (card->usdhc_inst == USDHC1) {
sdcard_usdhc1_state.inserted = detect;
sdcard_usdhc1_state.initialized = detect ? sdcard_usdhc1_state.initialized : false;
}
#endif
#if defined MICROPY_USDHC2 && USDHC2_AVAIL
if (card->usdhc_inst == USDHC2) {
sdcard_usdhc2_state.inserted = detect;
sdcard_usdhc2_state.initialized = detect ? sdcard_usdhc2_state.initialized : false;
}
#endif
return detect;
}
#endif // MICROPY_PY_MACHINE_SDCARD
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