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OVMS3-idf/components/sdmmc/sdmmc_cmd.c
Ivan Grokhotkov 0f238dcdec sdmmc: fix reads/writes to/from unaligned buffers 
SDMMC hardware treats all buffers as aligned, and ignores 2 LSBs of
addresses written into DMA descriptors. Previously SDMMC host driver
assumed that data buffers passed from SDDMC command layer would be
aligned. However alignment checks were never implemented in the command
layer, as were the checks that the buffer coming from the application
would be in DMA capable memory. Most of the time this was indeed true.
However in some cases FATFS library can pass buffers offset by 2 bytes
from word boundary. “DMA capable” restriction may be broken if pSRAM
support is used.

This change adds buffer checks to the SDMMC host driver (alignment and
DMA capability), so that the host layer will error out for incompatible
buffers. In SDMMC command layer, a check is added to read and write
functions. If an incompatible buffer is passed from the application, new
buffer (512 bytes size) is allocated, and the transfer is performed
using {READ,WRITE}_SINGLE_BLOCK commands.
2017-09-25 23:45:40 +08:00

637 lines
22 KiB
C
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/*
* Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
* Adaptations to ESP-IDF Copyright (c) 2016 Espressif Systems (Shanghai) PTE LTD
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <string.h>
#include "esp_log.h"
#include "esp_heap_alloc_caps.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/sdmmc_defs.h"
#include "driver/sdmmc_types.h"
#include "sdmmc_cmd.h"
#define MIN(a,b) (((a)<(b))?(a):(b))
static const char* TAG = "sdmmc_cmd";
static esp_err_t sdmmc_send_cmd(sdmmc_card_t* card, sdmmc_command_t* cmd);
static esp_err_t sdmmc_send_app_cmd(sdmmc_card_t* card, sdmmc_command_t* cmd);
static esp_err_t sdmmc_send_cmd_go_idle_state(sdmmc_card_t* card);
static esp_err_t sdmmc_send_cmd_send_if_cond(sdmmc_card_t* card, uint32_t ocr);
static esp_err_t sdmmc_send_cmd_send_op_cond(sdmmc_card_t* card, uint32_t ocr, uint32_t *ocrp);
static esp_err_t sdmmc_decode_cid(sdmmc_response_t resp, sdmmc_cid_t* out_cid);
static esp_err_t sddmc_send_cmd_all_send_cid(sdmmc_card_t* card, sdmmc_cid_t* out_cid);
static esp_err_t sdmmc_send_cmd_set_relative_addr(sdmmc_card_t* card, uint16_t* out_rca);
static esp_err_t sdmmc_send_cmd_set_blocklen(sdmmc_card_t* card, sdmmc_csd_t* csd);
static esp_err_t sdmmc_decode_csd(sdmmc_response_t response, sdmmc_csd_t* out_csd);
static esp_err_t sdmmc_send_cmd_send_csd(sdmmc_card_t* card, sdmmc_csd_t* out_csd);
static esp_err_t sdmmc_send_cmd_select_card(sdmmc_card_t* card);
static esp_err_t sdmmc_decode_scr(uint32_t *raw_scr, sdmmc_scr_t* out_scr);
static esp_err_t sdmmc_send_cmd_send_scr(sdmmc_card_t* card, sdmmc_scr_t *out_scr);
static esp_err_t sdmmc_send_cmd_set_bus_width(sdmmc_card_t* card, int width);
static esp_err_t sdmmc_send_cmd_stop_transmission(sdmmc_card_t* card, uint32_t* status);
static esp_err_t sdmmc_send_cmd_send_status(sdmmc_card_t* card, uint32_t* out_status);
static uint32_t get_host_ocr(float voltage);
static esp_err_t sdmmc_write_sectors_dma(sdmmc_card_t* card, const void* src,
size_t start_block, size_t block_count);
static esp_err_t sdmmc_read_sectors_dma(sdmmc_card_t* card, void* dst,
size_t start_block, size_t block_count);
esp_err_t sdmmc_card_init(const sdmmc_host_t* config,
sdmmc_card_t* card)
{
ESP_LOGD(TAG, "%s", __func__);
memset(card, 0, sizeof(*card));
memcpy(&card->host, config, sizeof(*config));
esp_err_t err = sdmmc_send_cmd_go_idle_state(card);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: go_idle_state (1) returned 0x%x", __func__, err);
return err;
}
ets_delay_us(10000);
uint32_t host_ocr = get_host_ocr(config->io_voltage);
err = sdmmc_send_cmd_send_if_cond(card, host_ocr);
if (err == ESP_OK) {
ESP_LOGD(TAG, "SDHC/SDXC card");
host_ocr |= SD_OCR_SDHC_CAP;
} else if (err == ESP_ERR_TIMEOUT) {
ESP_LOGD(TAG, "CMD8 timeout; not an SDHC/SDXC card");
} else {
ESP_LOGE(TAG, "%s: send_if_cond (1) returned 0x%x", __func__, err);
return err;
}
err = sdmmc_send_cmd_send_op_cond(card, host_ocr, &card->ocr);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_op_cond (1) returned 0x%x", __func__, err);
return err;
}
host_ocr &= card->ocr;
ESP_LOGD(TAG, "sdmmc_card_init: host_ocr=%08x, card_ocr=%08x", host_ocr, card->ocr);
err = sddmc_send_cmd_all_send_cid(card, &card->cid);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: all_send_cid returned 0x%x", __func__, err);
return err;
}
err = sdmmc_send_cmd_set_relative_addr(card, &card->rca);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: set_relative_addr returned 0x%x", __func__, err);
return err;
}
err = sdmmc_send_cmd_send_csd(card, &card->csd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_csd returned 0x%x", __func__, err);
return err;
}
const size_t max_sdsc_capacity = UINT32_MAX / card->csd.sector_size + 1;
if (!(card->ocr & SD_OCR_SDHC_CAP) &&
card->csd.capacity > max_sdsc_capacity) {
ESP_LOGW(TAG, "%s: SDSC card reports capacity=%u. Limiting to %u.",
__func__, card->csd.capacity, max_sdsc_capacity);
card->csd.capacity = max_sdsc_capacity;
}
err = sdmmc_send_cmd_select_card(card);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: select_card returned 0x%x", __func__, err);
return err;
}
if ((card->ocr & SD_OCR_SDHC_CAP) == 0) {
err = sdmmc_send_cmd_set_blocklen(card, &card->csd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: set_blocklen returned 0x%x", __func__, err);
return err;
}
}
err = sdmmc_send_cmd_send_scr(card, &card->scr);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_scr returned 0x%x", __func__, err);
return err;
}
if ((config->flags & SDMMC_HOST_FLAG_4BIT) &&
(card->scr.bus_width & SCR_SD_BUS_WIDTHS_4BIT)) {
ESP_LOGD(TAG, "switching to 4-bit bus mode");
err = sdmmc_send_cmd_set_bus_width(card, 4);
if (err != ESP_OK) {
ESP_LOGE(TAG, "set_bus_width failed");
return err;
}
err = (*config->set_bus_width)(config->slot, 4);
if (err != ESP_OK) {
ESP_LOGE(TAG, "slot->set_bus_width failed");
return err;
}
uint32_t status;
err = sdmmc_send_cmd_stop_transmission(card, &status);
if (err != ESP_OK) {
ESP_LOGE(TAG, "stop_transmission failed (0x%x)", err);
return err;
}
}
uint32_t status = 0;
while (!(status & MMC_R1_READY_FOR_DATA)) {
// TODO: add some timeout here
uint32_t count = 0;
err = sdmmc_send_cmd_send_status(card, &status);
if (err != ESP_OK) {
return err;
}
if (++count % 10 == 0) {
ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
}
}
if (config->max_freq_khz >= SDMMC_FREQ_HIGHSPEED &&
card->csd.tr_speed / 1000 >= SDMMC_FREQ_HIGHSPEED) {
ESP_LOGD(TAG, "switching to HS bus mode");
err = (*config->set_card_clk)(config->slot, SDMMC_FREQ_HIGHSPEED);
if (err != ESP_OK) {
ESP_LOGE(TAG, "failed to switch peripheral to HS bus mode");
return err;
}
} else if (config->max_freq_khz >= SDMMC_FREQ_DEFAULT &&
card->csd.tr_speed / 1000 >= SDMMC_FREQ_DEFAULT) {
ESP_LOGD(TAG, "switching to DS bus mode");
err = (*config->set_card_clk)(config->slot, SDMMC_FREQ_DEFAULT);
if (err != ESP_OK) {
ESP_LOGE(TAG, "failed to switch peripheral to HS bus mode");
return err;
}
}
sdmmc_scr_t scr_tmp;
err = sdmmc_send_cmd_send_scr(card, &scr_tmp);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_scr returned 0x%x", __func__, err);
return err;
}
if (memcmp(&card->scr, &scr_tmp, sizeof(scr_tmp)) != 0) {
ESP_LOGE(TAG, "data check fail!");
return ESP_ERR_INVALID_RESPONSE;
}
return ESP_OK;
}
void sdmmc_card_print_info(FILE* stream, const sdmmc_card_t* card)
{
fprintf(stream, "Name: %s\n", card->cid.name);
fprintf(stream, "Type: %s\n", (card->ocr & SD_OCR_SDHC_CAP)?"SDHC/SDXC":"SDSC");
fprintf(stream, "Speed: %s\n", (card->csd.tr_speed > 25000000)?"high speed":"default speed");
fprintf(stream, "Size: %lluMB\n", ((uint64_t) card->csd.capacity) * card->csd.sector_size / (1024 * 1024));
fprintf(stream, "CSD: ver=%d, sector_size=%d, capacity=%d read_bl_len=%d\n",
card->csd.csd_ver,
card->csd.sector_size, card->csd.capacity, card->csd.read_block_len);
fprintf(stream, "SCR: sd_spec=%d, bus_width=%d\n", card->scr.sd_spec, card->scr.bus_width);
}
static esp_err_t sdmmc_send_cmd(sdmmc_card_t* card, sdmmc_command_t* cmd)
{
int slot = card->host.slot;
ESP_LOGV(TAG, "sending cmd slot=%d op=%d arg=%x flags=%x data=%p blklen=%d datalen=%d",
slot, cmd->opcode, cmd->arg, cmd->flags, cmd->data, cmd->blklen, cmd->datalen);
esp_err_t err = (*card->host.do_transaction)(slot, cmd);
if (err != 0) {
ESP_LOGD(TAG, "sdmmc_req_run returned 0x%x", err);
return err;
}
int state = MMC_R1_CURRENT_STATE(cmd->response);
ESP_LOGV(TAG, "cmd response %08x %08x %08x %08x err=0x%x state=%d",
cmd->response[0],
cmd->response[1],
cmd->response[2],
cmd->response[3],
cmd->error,
state);
return cmd->error;
}
static esp_err_t sdmmc_send_app_cmd(sdmmc_card_t* card, sdmmc_command_t* cmd)
{
sdmmc_command_t app_cmd = {
.opcode = MMC_APP_CMD,
.flags = SCF_CMD_AC | SCF_RSP_R1,
.arg = MMC_ARG_RCA(card->rca),
};
esp_err_t err = sdmmc_send_cmd(card, &app_cmd);
if (err != ESP_OK) {
return err;
}
if (!(MMC_R1(app_cmd.response) & MMC_R1_APP_CMD)) {
ESP_LOGW(TAG, "card doesn't support APP_CMD");
return ESP_ERR_NOT_SUPPORTED;
}
return sdmmc_send_cmd(card, cmd);
}
static esp_err_t sdmmc_send_cmd_go_idle_state(sdmmc_card_t* card)
{
sdmmc_command_t cmd = {
.opcode = MMC_GO_IDLE_STATE,
.flags = SCF_CMD_BC | SCF_RSP_R0,
};
return sdmmc_send_cmd(card, &cmd);
}
static esp_err_t sdmmc_send_cmd_send_if_cond(sdmmc_card_t* card, uint32_t ocr)
{
const uint8_t pattern = 0xaa; /* any pattern will do here */
sdmmc_command_t cmd = {
.opcode = SD_SEND_IF_COND,
.arg = (((ocr & SD_OCR_VOL_MASK) != 0) << 8) | pattern,
.flags = SCF_CMD_BCR | SCF_RSP_R7,
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
uint8_t response = cmd.response[0] & 0xff;
if (response != pattern) {
return ESP_ERR_INVALID_RESPONSE;
}
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_send_op_cond(sdmmc_card_t* card, uint32_t ocr, uint32_t *ocrp)
{
sdmmc_command_t cmd = {
.arg = ocr,
.flags = SCF_CMD_BCR | SCF_RSP_R3,
.opcode = SD_APP_OP_COND
};
int nretries = 100; // arbitrary, BSD driver uses this value
for (; nretries != 0; --nretries) {
esp_err_t err = sdmmc_send_app_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
if ((MMC_R3(cmd.response) & MMC_OCR_MEM_READY) ||
ocr == 0) {
break;
}
vTaskDelay(10 / portTICK_PERIOD_MS);
}
if (nretries == 0) {
return ESP_ERR_TIMEOUT;
}
if (ocrp) {
*ocrp = MMC_R3(cmd.response);
}
return ESP_OK;
}
static esp_err_t sdmmc_decode_cid(sdmmc_response_t resp, sdmmc_cid_t* out_cid)
{
out_cid->mfg_id = SD_CID_MID(resp);
out_cid->oem_id = SD_CID_OID(resp);
SD_CID_PNM_CPY(resp, out_cid->name);
out_cid->revision = SD_CID_REV(resp);
out_cid->serial = SD_CID_PSN(resp);
out_cid->date = SD_CID_MDT(resp);
return ESP_OK;
}
static esp_err_t sddmc_send_cmd_all_send_cid(sdmmc_card_t* card, sdmmc_cid_t* out_cid)
{
assert(out_cid);
sdmmc_command_t cmd = {
.opcode = MMC_ALL_SEND_CID,
.flags = SCF_CMD_BCR | SCF_RSP_R2
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
return sdmmc_decode_cid(cmd.response, out_cid);
}
static esp_err_t sdmmc_send_cmd_set_relative_addr(sdmmc_card_t* card, uint16_t* out_rca)
{
assert(out_rca);
sdmmc_command_t cmd = {
.opcode = SD_SEND_RELATIVE_ADDR,
.flags = SCF_CMD_BCR | SCF_RSP_R6
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
*out_rca = SD_R6_RCA(cmd.response);
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_set_blocklen(sdmmc_card_t* card, sdmmc_csd_t* csd)
{
sdmmc_command_t cmd = {
.opcode = MMC_SET_BLOCKLEN,
.arg = csd->sector_size,
.flags = SCF_CMD_AC | SCF_RSP_R1
};
return sdmmc_send_cmd(card, &cmd);
}
static esp_err_t sdmmc_decode_csd(sdmmc_response_t response, sdmmc_csd_t* out_csd)
{
out_csd->csd_ver = SD_CSD_CSDVER(response);
switch (out_csd->csd_ver) {
case SD_CSD_CSDVER_2_0:
out_csd->capacity = SD_CSD_V2_CAPACITY(response);
out_csd->read_block_len = SD_CSD_V2_BL_LEN;
break;
case SD_CSD_CSDVER_1_0:
out_csd->capacity = SD_CSD_CAPACITY(response);
out_csd->read_block_len = SD_CSD_READ_BL_LEN(response);
break;
default:
ESP_LOGE(TAG, "unknown SD CSD structure version 0x%x", out_csd->csd_ver);
return ESP_ERR_NOT_SUPPORTED;
}
out_csd->card_command_class = SD_CSD_CCC(response);
int read_bl_size = 1 << out_csd->read_block_len;
out_csd->sector_size = MIN(read_bl_size, 512);
if (out_csd->sector_size < read_bl_size) {
out_csd->capacity *= read_bl_size / out_csd->sector_size;
}
int speed = SD_CSD_SPEED(response);
if (speed == SD_CSD_SPEED_50_MHZ) {
out_csd->tr_speed = 50000000;
} else {
out_csd->tr_speed = 25000000;
}
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_send_csd(sdmmc_card_t* card, sdmmc_csd_t* out_csd)
{
sdmmc_command_t cmd = {
.opcode = MMC_SEND_CSD,
.arg = MMC_ARG_RCA(card->rca),
.flags = SCF_CMD_AC | SCF_RSP_R2
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
return sdmmc_decode_csd(cmd.response, out_csd);
}
static esp_err_t sdmmc_send_cmd_select_card(sdmmc_card_t* card)
{
sdmmc_command_t cmd = {
.opcode = MMC_SELECT_CARD,
.arg = MMC_ARG_RCA(card->rca),
.flags = SCF_CMD_AC | SCF_RSP_R1
};
return sdmmc_send_cmd(card, &cmd);
}
static esp_err_t sdmmc_decode_scr(uint32_t *raw_scr, sdmmc_scr_t* out_scr)
{
sdmmc_response_t resp = {0xabababab, 0xabababab, 0x12345678, 0x09abcdef};
resp[2] = __builtin_bswap32(raw_scr[0]);
resp[3] = __builtin_bswap32(raw_scr[1]);
int ver = SCR_STRUCTURE(resp);
if (ver != 0) {
return ESP_ERR_NOT_SUPPORTED;
}
out_scr->sd_spec = SCR_SD_SPEC(resp);
out_scr->bus_width = SCR_SD_BUS_WIDTHS(resp);
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_send_scr(sdmmc_card_t* card, sdmmc_scr_t *out_scr)
{
size_t datalen = 8;
uint32_t* buf = (uint32_t*) pvPortMallocCaps(datalen, MALLOC_CAP_DMA);
if (buf == NULL) {
return ESP_ERR_NO_MEM;
}
sdmmc_command_t cmd = {
.data = buf,
.datalen = datalen,
.blklen = datalen,
.flags = SCF_CMD_ADTC | SCF_CMD_READ | SCF_RSP_R1,
.opcode = SD_APP_SEND_SCR
};
esp_err_t err = sdmmc_send_app_cmd(card, &cmd);
if (err == ESP_OK) {
buf[0] = (buf[0]);
buf[1] = (buf[1]);
err = sdmmc_decode_scr(buf, out_scr);
}
free(buf);
return err;
}
static esp_err_t sdmmc_send_cmd_set_bus_width(sdmmc_card_t* card, int width)
{
sdmmc_command_t cmd = {
.opcode = SD_APP_SET_BUS_WIDTH,
.flags = SCF_RSP_R1 | SCF_CMD_AC,
.arg = (width == 4) ? SD_ARG_BUS_WIDTH_4 : SD_ARG_BUS_WIDTH_1
};
return sdmmc_send_app_cmd(card, &cmd);
}
static esp_err_t sdmmc_send_cmd_stop_transmission(sdmmc_card_t* card, uint32_t* status)
{
sdmmc_command_t cmd = {
.opcode = MMC_STOP_TRANSMISSION,
.arg = 0,
.flags = SCF_RSP_R1B | SCF_CMD_AC
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err == 0) {
*status = MMC_R1(cmd.response);
}
return err;
}
static uint32_t get_host_ocr(float voltage)
{
// TODO: report exact voltage to the card
// For now tell that the host has 2.8-3.6V voltage range
(void) voltage;
return SD_OCR_VOL_MASK;
}
static esp_err_t sdmmc_send_cmd_send_status(sdmmc_card_t* card, uint32_t* out_status)
{
sdmmc_command_t cmd = {
.opcode = MMC_SEND_STATUS,
.arg = MMC_ARG_RCA(card->rca),
.flags = SCF_CMD_AC | SCF_RSP_R1
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
if (out_status) {
*out_status = MMC_R1(cmd.response);
}
return ESP_OK;
}
esp_err_t sdmmc_write_sectors(sdmmc_card_t* card, const void* src,
size_t start_block, size_t block_count)
{
esp_err_t err = ESP_OK;
size_t block_size = card->csd.sector_size;
if (esp_ptr_dma_capable(src) && (intptr_t)src % 4 == 0) {
err = sdmmc_write_sectors_dma(card, src, start_block, block_count);
} else {
// SDMMC peripheral needs DMA-capable buffers. Split the write into
// separate single block writes, if needed, and allocate a temporary
// DMA-capable buffer.
void* tmp_buf = pvPortMallocCaps(block_size, MALLOC_CAP_DMA);
if (tmp_buf == NULL) {
return ESP_ERR_NO_MEM;
}
const uint8_t* cur_src = (const uint8_t*) src;
for (size_t i = 0; i < block_count; ++i) {
memcpy(tmp_buf, cur_src, block_size);
cur_src += block_size;
err = sdmmc_write_sectors_dma(card, tmp_buf, start_block + i, 1);
if (err != ESP_OK) {
ESP_LOGD(TAG, "%s: error 0x%x writing block %d+%d",
__func__, err, start_block, i);
break;
}
}
free(tmp_buf);
}
return err;
}
static esp_err_t sdmmc_write_sectors_dma(sdmmc_card_t* card, const void* src,
size_t start_block, size_t block_count)
{
if (start_block + block_count > card->csd.capacity) {
return ESP_ERR_INVALID_SIZE;
}
size_t block_size = card->csd.sector_size;
sdmmc_command_t cmd = {
.flags = SCF_CMD_ADTC | SCF_RSP_R1,
.blklen = block_size,
.data = (void*) src,
.datalen = block_count * block_size
};
if (block_count == 1) {
cmd.opcode = MMC_WRITE_BLOCK_SINGLE;
} else {
cmd.opcode = MMC_WRITE_BLOCK_MULTIPLE;
}
if (card->ocr & SD_OCR_SDHC_CAP) {
cmd.arg = start_block;
} else {
cmd.arg = start_block * block_size;
}
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
return err;
}
uint32_t status = 0;
size_t count = 0;
while (!(status & MMC_R1_READY_FOR_DATA)) {
// TODO: add some timeout here
err = sdmmc_send_cmd_send_status(card, &status);
if (err != ESP_OK) {
return err;
}
if (++count % 10 == 0) {
ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
}
}
return ESP_OK;
}
esp_err_t sdmmc_read_sectors(sdmmc_card_t* card, void* dst,
size_t start_block, size_t block_count)
{
esp_err_t err = ESP_OK;
size_t block_size = card->csd.sector_size;
if (esp_ptr_dma_capable(dst) && (intptr_t)dst % 4 == 0) {
err = sdmmc_read_sectors_dma(card, dst, start_block, block_count);
} else {
// SDMMC peripheral needs DMA-capable buffers. Split the read into
// separate single block reads, if needed, and allocate a temporary
// DMA-capable buffer.
void* tmp_buf = pvPortMallocCaps(block_size, MALLOC_CAP_DMA);
if (tmp_buf == NULL) {
return ESP_ERR_NO_MEM;
}
uint8_t* cur_dst = (uint8_t*) dst;
for (size_t i = 0; i < block_count; ++i) {
err = sdmmc_read_sectors_dma(card, tmp_buf, start_block + i, 1);
if (err != ESP_OK) {
ESP_LOGD(TAG, "%s: error 0x%x writing block %d+%d",
__func__, err, start_block, i);
break;
}
memcpy(cur_dst, tmp_buf, block_size);
cur_dst += block_size;
}
free(tmp_buf);
}
return err;
}
static esp_err_t sdmmc_read_sectors_dma(sdmmc_card_t* card, void* dst,
size_t start_block, size_t block_count)
{
if (start_block + block_count > card->csd.capacity) {
return ESP_ERR_INVALID_SIZE;
}
size_t block_size = card->csd.sector_size;
sdmmc_command_t cmd = {
.flags = SCF_CMD_ADTC | SCF_CMD_READ | SCF_RSP_R1,
.blklen = block_size,
.data = (void*) dst,
.datalen = block_count * block_size
};
if (block_count == 1) {
cmd.opcode = MMC_READ_BLOCK_SINGLE;
} else {
cmd.opcode = MMC_READ_BLOCK_MULTIPLE;
}
if (card->ocr & SD_OCR_SDHC_CAP) {
cmd.arg = start_block;
} else {
cmd.arg = start_block * block_size;
}
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
return err;
}
uint32_t status = 0;
size_t count = 0;
while (!(status & MMC_R1_READY_FOR_DATA)) {
// TODO: add some timeout here
err = sdmmc_send_cmd_send_status(card, &status);
if (err != ESP_OK) {
return err;
}
if (++count % 10 == 0) {
ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
}
}
return ESP_OK;
}
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