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OVMS3-idf/components/driver/sdspi_host.c
Ivan Grokhotkov 4a2489b99a sdspi: fix compatibility issue in multi block read 
SDSPI driver optimized polling of the response tokens by requesting
two extra bytes on top of the block size (512) and CRC (2), and
checking whether these bytes contained the data response token or
not. In case the token was there, further polling would not need to
happen, thereby reducing latency between two consecutive blocks
transferred. However this caused compatibility issues when these two
extra bytes were sent after reading the final block. When
STOP_TRANSMISSION command was sent, these extra two bytes were
treated as part of the command, causing an invalid command error.

This fixes the logic by only requesting extra two bytes if the block
being read is not the final block. In addition to that, more strict
error checking is implemented for command response tokens.
2018-03-30 18:49:42 +08:00

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// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stddef.h>
#include <sys/param.h>
#include "esp_log.h"
#include "esp_heap_caps.h"
#include "driver/gpio.h"
#include "driver/sdmmc_defs.h"
#include "driver/sdspi_host.h"
#include "sdspi_private.h"
#include "sdspi_crc.h"
#include "esp_timer.h"
/// Max number of transactions in flight (used in start_command_write_blocks)
#define SDSPI_TRANSACTION_COUNT 4
#define SDSPI_MOSI_IDLE_VAL 0xff //!< Data value which causes MOSI to stay high
#define GPIO_UNUSED 0xff //!< Flag indicating that CD/WP is unused
/// Size of the buffer returned by get_block_buf
#define SDSPI_BLOCK_BUF_SIZE (SDSPI_MAX_DATA_LEN + 4)
/// Maximum number of dummy bytes between the request and response (minimum is 1)
#define SDSPI_RESPONSE_MAX_DELAY 8
/// Structure containing run time configuration for a single SD slot
typedef struct {
spi_device_handle_t handle; //!< SPI device handle, used for transactions
uint8_t gpio_cs; //!< CS GPIO
uint8_t gpio_cd; //!< Card detect GPIO, or GPIO_UNUSED
uint8_t gpio_wp; //!< Write protect GPIO, or GPIO_UNUSED
/// Set to 1 if the higher layer has asked the card to enable CRC checks
uint8_t data_crc_enabled : 1;
/// Number of transactions in 'transactions' array which are in use
uint8_t used_transaction_count: 3;
/// Intermediate buffer used when application buffer is not in DMA memory;
/// allocated on demand, SDSPI_BLOCK_BUF_SIZE bytes long. May be zero.
uint8_t* block_buf;
/// array with SDSPI_TRANSACTION_COUNT transaction structures
spi_transaction_t* transactions;
} slot_info_t;
static slot_info_t s_slots[3];
static const char *TAG = "sdspi_host";
/// Functions to send out different kinds of commands
static esp_err_t start_command_read_blocks(int slot, sdspi_hw_cmd_t *cmd,
uint8_t *data, uint32_t rx_length);
static esp_err_t start_command_write_blocks(int slot, sdspi_hw_cmd_t *cmd,
const uint8_t *data, uint32_t tx_length);
static esp_err_t start_command_default(int slot, int flags, sdspi_hw_cmd_t *cmd);
/// A few helper functions
/// Set CS high for given slot
static void cs_high(int slot)
{
gpio_set_level(s_slots[slot].gpio_cs, 1);
}
/// Set CS low for given slot
static void cs_low(int slot)
{
gpio_set_level(s_slots[slot].gpio_cs, 0);
}
/// Return true if WP pin is configured and is low
static bool card_write_protected(int slot)
{
if (s_slots[slot].gpio_wp == GPIO_UNUSED) {
return false;
}
return gpio_get_level(s_slots[slot].gpio_wp) == 0;
}
/// Return true if CD pin is configured and is high
static bool card_missing(int slot)
{
if (s_slots[slot].gpio_cd == GPIO_UNUSED) {
return false;
}
return gpio_get_level(s_slots[slot].gpio_cd) == 1;
}
/// Check if slot number is within bounds
static bool is_valid_slot(int slot)
{
return slot == VSPI_HOST || slot == HSPI_HOST;
}
static spi_device_handle_t spi_handle(int slot)
{
return s_slots[slot].handle;
}
static bool is_slot_initialized(int slot)
{
return spi_handle(slot) != NULL;
}
static bool data_crc_enabled(int slot)
{
return s_slots[slot].data_crc_enabled;
}
/// Get pointer to a block of DMA memory, allocate if necessary.
/// This is used if the application provided buffer is not in DMA capable memory.
static esp_err_t get_block_buf(int slot, uint8_t** out_buf)
{
if (s_slots[slot].block_buf == NULL) {
s_slots[slot].block_buf = heap_caps_malloc(SDSPI_BLOCK_BUF_SIZE, MALLOC_CAP_DMA);
if (s_slots[slot].block_buf == NULL) {
return ESP_ERR_NO_MEM;
}
}
*out_buf = s_slots[slot].block_buf;
return ESP_OK;
}
static spi_transaction_t* get_transaction(int slot)
{
size_t used_transaction_count = s_slots[slot].used_transaction_count;
assert(used_transaction_count < SDSPI_TRANSACTION_COUNT);
spi_transaction_t* ret = &s_slots[slot].transactions[used_transaction_count];
++s_slots[slot].used_transaction_count;
return ret;
}
static void release_transaction(int slot)
{
--s_slots[slot].used_transaction_count;
}
static void wait_for_transactions(int slot)
{
size_t used_transaction_count = s_slots[slot].used_transaction_count;
for (size_t i = 0; i < used_transaction_count; ++i) {
spi_transaction_t* t_out;
spi_device_get_trans_result(spi_handle(slot), &t_out, portMAX_DELAY);
release_transaction(slot);
}
}
/// Clock out one byte (CS has to be high) to make the card release MISO
/// (clocking one bit would work as well, but that triggers a bug in SPI DMA)
static void release_bus(int slot)
{
spi_transaction_t t = {
.flags = SPI_TRANS_USE_RXDATA | SPI_TRANS_USE_TXDATA,
.length = 8,
.tx_data = {0xff}
};
spi_device_transmit(spi_handle(slot), &t);
// don't care if this failed
}
/// Clock out 80 cycles (10 bytes) before GO_IDLE command
static void go_idle_clockout(int slot)
{
//actually we need 10, declare 12 to meet requirement of RXDMA
uint8_t data[12];
memset(data, 0xff, sizeof(data));
spi_transaction_t t = {
.length = 10*8,
.tx_buffer = data,
.rx_buffer = data,
};
spi_device_transmit(spi_handle(slot), &t);
// don't care if this failed
}
/// Return true if the pointer can be used for DMA
static bool ptr_dma_compatible(const void* ptr)
{
return (uintptr_t) ptr >= 0x3FFAE000 &&
(uintptr_t) ptr < 0x40000000;
}
/**
* Initialize SPI device. Used to change clock speed.
* @param slot SPI host number
* @param clock_speed_hz clock speed, Hz
* @return ESP_OK on success
*/
static esp_err_t init_spi_dev(int slot, int clock_speed_hz)
{
if (spi_handle(slot)) {
// Reinitializing
spi_bus_remove_device(spi_handle(slot));
s_slots[slot].handle = NULL;
}
spi_device_interface_config_t devcfg = {
.clock_speed_hz = clock_speed_hz,
.mode = 0,
// For SD cards, CS must stay low during the whole read/write operation,
// rather than a single SPI transaction.
.spics_io_num = -1,
.queue_size = SDSPI_TRANSACTION_COUNT,
};
return spi_bus_add_device((spi_host_device_t) slot, &devcfg, &s_slots[slot].handle);
}
esp_err_t sdspi_host_init()
{
return ESP_OK;
}
esp_err_t sdspi_host_deinit()
{
for (size_t i = 0; i < sizeof(s_slots)/sizeof(s_slots[0]); ++i) {
if (s_slots[i].handle) {
spi_bus_remove_device(s_slots[i].handle);
free(s_slots[i].block_buf);
s_slots[i].block_buf = NULL;
free(s_slots[i].transactions);
s_slots[i].transactions = NULL;
spi_bus_free((spi_host_device_t) i);
s_slots[i].handle = NULL;
}
}
return ESP_OK;
}
esp_err_t sdspi_host_set_card_clk(int slot, uint32_t freq_khz)
{
if (!is_valid_slot(slot)) {
return ESP_ERR_INVALID_ARG;
}
if (!is_slot_initialized(slot)) {
return ESP_ERR_INVALID_STATE;
}
ESP_LOGD(TAG, "Setting card clock to %d kHz", freq_khz);
return init_spi_dev(slot, freq_khz * 1000);
}
esp_err_t sdspi_host_init_slot(int slot, const sdspi_slot_config_t* slot_config)
{
ESP_LOGD(TAG, "%s: SPI%d miso=%d mosi=%d sck=%d cs=%d cd=%d wp=%d, dma_ch=%d",
__func__, slot + 1,
slot_config->gpio_miso, slot_config->gpio_mosi,
slot_config->gpio_sck, slot_config->gpio_cs,
slot_config->gpio_cd, slot_config->gpio_wp,
slot_config->dma_channel);
spi_host_device_t host = (spi_host_device_t) slot;
if (!is_valid_slot(slot)) {
return ESP_ERR_INVALID_ARG;
}
spi_bus_config_t buscfg = {
.miso_io_num = slot_config->gpio_miso,
.mosi_io_num = slot_config->gpio_mosi,
.sclk_io_num = slot_config->gpio_sck,
.quadwp_io_num = -1,
.quadhd_io_num = -1
};
// Initialize SPI bus
esp_err_t ret = spi_bus_initialize((spi_host_device_t)slot, &buscfg,
slot_config->dma_channel);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "spi_bus_initialize failed with rc=0x%x", ret);
return ret;
}
// Attach the SD card to the SPI bus
ret = init_spi_dev(slot, SDMMC_FREQ_PROBING * 1000);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "spi_bus_add_device failed with rc=0x%x", ret);
spi_bus_free(host);
return ret;
}
// Configure CS pin
s_slots[slot].gpio_cs = (uint8_t) slot_config->gpio_cs;
gpio_config_t io_conf = {
.intr_type = GPIO_PIN_INTR_DISABLE,
.mode = GPIO_MODE_OUTPUT,
.pin_bit_mask = 1LL << slot_config->gpio_cs,
};
ret = gpio_config(&io_conf);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "gpio_config (CS) failed with rc=0x%x", ret);
spi_bus_remove_device(spi_handle(slot));
s_slots[slot].handle = NULL;
spi_bus_free(host);
return ret;
}
cs_high(slot);
// Configure CD and WP pins
io_conf = (gpio_config_t) {
.intr_type = GPIO_PIN_INTR_DISABLE,
.mode = GPIO_MODE_OUTPUT,
.pin_bit_mask = 0,
.pull_up_en = true
};
if (slot_config->gpio_cd != SDSPI_SLOT_NO_CD) {
io_conf.pin_bit_mask |= (1 << slot_config->gpio_cd);
s_slots[slot].gpio_wp = slot_config->gpio_wp;
} else {
s_slots[slot].gpio_wp = GPIO_UNUSED;
}
if (slot_config->gpio_wp != SDSPI_SLOT_NO_WP) {
io_conf.pin_bit_mask |= (1 << slot_config->gpio_wp);
s_slots[slot].gpio_cd = slot_config->gpio_cd;
} else {
s_slots[slot].gpio_cd = GPIO_UNUSED;
}
if (io_conf.pin_bit_mask != 0) {
ret = gpio_config(&io_conf);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "gpio_config (CD/WP) failed with rc=0x%x", ret);
spi_bus_remove_device(spi_handle(slot));
s_slots[slot].handle = NULL;
spi_bus_free(host);
return ret;
}
}
s_slots[slot].transactions = calloc(SDSPI_TRANSACTION_COUNT, sizeof(spi_transaction_t));
if (s_slots[slot].transactions == NULL) {
spi_bus_remove_device(spi_handle(slot));
s_slots[slot].handle = NULL;
spi_bus_free(host);
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t sdspi_host_start_command(int slot, sdspi_hw_cmd_t *cmd, void *data,
uint32_t data_size, int flags)
{
if (!is_valid_slot(slot)) {
return ESP_ERR_INVALID_ARG;
}
if (!is_slot_initialized(slot)) {
return ESP_ERR_INVALID_STATE;
}
if (card_missing(slot)) {
return ESP_ERR_NOT_FOUND;
}
// save some parts of cmd, as its contents will be overwritten
int cmd_index = cmd->cmd_index;
uint32_t cmd_arg;
memcpy(&cmd_arg, cmd->arguments, sizeof(cmd_arg));
cmd_arg = __builtin_bswap32(cmd_arg);
ESP_LOGV(TAG, "%s: slot=%i, CMD%d, arg=0x%08x flags=0x%x, data=%p, data_size=%i crc=0x%02x",
__func__, slot, cmd_index, cmd_arg, flags, data, data_size, cmd->crc7);
// For CMD0, clock out 80 cycles to help the card enter idle state,
// *before* CS is asserted.
if (cmd_index == MMC_GO_IDLE_STATE) {
go_idle_clockout(slot);
}
// actual transaction
esp_err_t ret = ESP_OK;
cs_low(slot);
if (flags & SDSPI_CMD_FLAG_DATA) {
if (flags & SDSPI_CMD_FLAG_WRITE) {
ret = start_command_write_blocks(slot, cmd, data, data_size);
} else {
ret = start_command_read_blocks(slot, cmd, data, data_size);
}
} else {
ret = start_command_default(slot, flags, cmd);
}
cs_high(slot);
release_bus(slot);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "%s: cmd=%d error=0x%x", __func__, cmd_index, ret);
} else {
// Update internal state when some commands are sent successfully
if (cmd_index == SD_CRC_ON_OFF) {
s_slots[slot].data_crc_enabled = (uint8_t) cmd_arg;
ESP_LOGD(TAG, "data CRC set=%d", s_slots[slot].data_crc_enabled);
}
}
return ret;
}
static esp_err_t start_command_default(int slot, int flags, sdspi_hw_cmd_t *cmd)
{
size_t cmd_size = SDSPI_CMD_R1_SIZE;
if (flags & SDSPI_CMD_FLAG_RSP_R1) {
cmd_size = SDSPI_CMD_R1_SIZE;
} else if (flags & SDSPI_CMD_FLAG_RSP_R2) {
cmd_size = SDSPI_CMD_R2_SIZE;
} else if (flags & SDSPI_CMD_FLAG_RSP_R3) {
cmd_size = SDSPI_CMD_R3_SIZE;
} else if (flags & SDSPI_CMD_FLAG_RSP_R7) {
cmd_size = SDSPI_CMD_R7_SIZE;
}
spi_transaction_t t = {
.flags = 0,
.length = cmd_size * 8,
.tx_buffer = cmd,
.rx_buffer = cmd
};
esp_err_t ret = spi_device_transmit(spi_handle(slot), &t);
if (cmd->cmd_index == MMC_STOP_TRANSMISSION) {
/* response is a stuff byte from previous transfer, ignore it */
cmd->r1 = 0xff;
}
int response_delay_bytes = SDSPI_RESPONSE_MAX_DELAY;
while ((cmd->r1 & SD_SPI_R1_NO_RESPONSE) != 0 && response_delay_bytes-- > 0) {
spi_transaction_t* t = get_transaction(slot);
*t = (spi_transaction_t) {
.flags = SPI_TRANS_USE_RXDATA | SPI_TRANS_USE_TXDATA,
.length = 8,
};
t->tx_data[0] = 0xff;
ret = spi_device_transmit(spi_handle(slot), t);
uint8_t r1 = t->rx_data[0];
release_transaction(slot);
if (ret != ESP_OK) {
return ret;
}
cmd->r1 = r1;
}
if (cmd->r1 & SD_SPI_R1_NO_RESPONSE) {
ESP_LOGD(TAG, "%s: no response token found", __func__);
return ESP_ERR_TIMEOUT;
}
return ret;
}
// Wait until MISO goes high
static esp_err_t poll_busy(int slot, spi_transaction_t* t, int timeout_ms)
{
uint8_t t_rx;
*t = (spi_transaction_t) {
.tx_buffer = &t_rx,
.flags = SPI_TRANS_USE_RXDATA, //data stored in rx_data
.length = 8,
};
esp_err_t ret;
uint64_t t_end = esp_timer_get_time() + timeout_ms * 1000;
int nonzero_count = 0;
do {
t_rx = SDSPI_MOSI_IDLE_VAL;
t->rx_data[0] = 0;
ret = spi_device_transmit(spi_handle(slot), t);
if (ret != ESP_OK) {
return ret;
}
if (t->rx_data[0] != 0) {
if (++nonzero_count == 2) {
return ESP_OK;
}
}
} while(esp_timer_get_time() < t_end);
ESP_LOGD(TAG, "%s: timeout", __func__);
return ESP_ERR_TIMEOUT;
}
// Wait for response token
static esp_err_t poll_response_token(int slot, spi_transaction_t* t, int timeout_ms)
{
uint8_t t_rx;
*t = (spi_transaction_t) {
.tx_buffer = &t_rx,
.flags = SPI_TRANS_USE_RXDATA,
.length = 8,
};
esp_err_t ret;
uint64_t t_end = esp_timer_get_time() + timeout_ms * 1000;
do {
t_rx = SDSPI_MOSI_IDLE_VAL;
t->rx_data[0] = 0;
ret = spi_device_transmit(spi_handle(slot), t);
if (ret != ESP_OK) {
return ret;
}
if ((t->rx_data[0] & TOKEN_RSP_MASK) == TOKEN_RSP_OK) {
return ESP_OK;
}
if ((t->rx_data[0] & TOKEN_RSP_MASK) == TOKEN_RSP_CRC_ERR) {
return ESP_ERR_INVALID_CRC;
}
if ((t->rx_data[0] & TOKEN_RSP_MASK) == TOKEN_RSP_WRITE_ERR) {
return ESP_ERR_INVALID_RESPONSE;
}
} while (esp_timer_get_time() < t_end);
ESP_LOGD(TAG, "%s: timeout", __func__);
return ESP_ERR_TIMEOUT;
}
// Wait for data token, reading 8 bytes at a time.
// If the token is found, write all subsequent bytes to extra_ptr,
// and store the number of bytes written to extra_size.
static esp_err_t poll_data_token(int slot, spi_transaction_t* t,
uint8_t* extra_ptr, size_t* extra_size, int timeout_ms)
{
uint8_t t_rx[8];
*t = (spi_transaction_t) {
.tx_buffer = &t_rx,
.rx_buffer = &t_rx,
.length = sizeof(t_rx) * 8,
};
esp_err_t ret;
uint64_t t_end = esp_timer_get_time() + timeout_ms * 1000;
do {
memset(t_rx, SDSPI_MOSI_IDLE_VAL, sizeof(t_rx));
ret = spi_device_transmit(spi_handle(slot), t);
if (ret != ESP_OK) {
return ret;
}
bool found = false;
for (int byte_idx = 0; byte_idx < sizeof(t_rx); byte_idx++) {
uint8_t rd_data = t_rx[byte_idx];
if (rd_data == TOKEN_BLOCK_START) {
found = true;
memcpy(extra_ptr, t_rx + byte_idx + 1, sizeof(t_rx) - byte_idx - 1);
*extra_size = sizeof(t_rx) - byte_idx - 1;
break;
}
if (rd_data != 0xff && rd_data != 0) {
ESP_LOGD(TAG, "%s: received 0x%02x while waiting for data",
__func__, rd_data);
return ESP_ERR_INVALID_RESPONSE;
}
}
if (found) {
return ESP_OK;
}
} while (esp_timer_get_time() < t_end);
ESP_LOGD(TAG, "%s: timeout", __func__);
return ESP_ERR_TIMEOUT;
}
/**
* Receiving one or more blocks of data happens as follows:
* 1. send command + receive r1 response (SDSPI_CMD_R1_SIZE bytes total)
* 2. keep receiving bytes until TOKEN_BLOCK_START is encountered (this may
* take a while, depending on card's read speed)
* 3. receive up to SDSPI_MAX_DATA_LEN = 512 bytes of actual data
* 4. receive 2 bytes of CRC
* 5. for multi block transfers, go to step 2
*
* These steps can be done separately, but that leads to a less than optimal
* performance on large transfers because of delays between each step.
* For example, if steps 3 and 4 are separate SPI transactions queued one after
* another, there will be ~16 microseconds of dead time between end of step 3
* and the beginning of step 4. A delay between two blocking SPI transactions
* in step 2 is even higher (~60 microseconds).
*
* To improve read performance the following sequence is adopted:
* 1. Do the first transfer: command + r1 response + 8 extra bytes.
* Set pre_scan_data_ptr to point to the 8 extra bytes, and set
* pre_scan_data_size to 8.
* 2. Search pre_scan_data_size bytes for TOKEN_BLOCK_START.
* If found, the rest of the bytes contain part of the actual data.
* Store pointer to and size of that extra data as extra_data_{ptr,size}.
* If not found, fall back to polling for TOKEN_BLOCK_START, 8 bytes at a
* time (in poll_data_token function). Deal with extra data in the same way,
* by setting extra_data_{ptr,size}.
* 3. Receive the remaining 512 - extra_data_size bytes, plus 4 extra bytes
* (i.e. 516 - extra_data_size). Of the 4 extra bytes, first two will capture
* the CRC value, and the other two will capture 0xff 0xfe sequence
* indicating the start of the next block. Actual scanning is done by
* setting pre_scan_data_ptr to point to these last 2 bytes, and setting
* pre_scan_data_size = 2, then going to step 2 to receive the next block.
* When the final block is being received, the number of extra bytes is 2
* (only for CRC), because we don't need to wait for start token of the
* next block, and some cards are getting confused by these two extra bytes.
*
* With this approach the delay between blocks of a multi-block transfer is
* ~95 microseconds, out of which 35 microseconds are spend doing the CRC check.
* Further speedup is possible by pipelining transfers and CRC checks, at an
* expense of one extra temporary buffer.
*/
static esp_err_t start_command_read_blocks(int slot, sdspi_hw_cmd_t *cmd,
uint8_t *data, uint32_t rx_length)
{
bool need_stop_command = rx_length > SDSPI_MAX_DATA_LEN;
spi_transaction_t* t_command = get_transaction(slot);
*t_command = (spi_transaction_t) {
.length = (SDSPI_CMD_R1_SIZE + SDSPI_RESPONSE_MAX_DELAY) * 8,
.tx_buffer = cmd,
.rx_buffer = cmd,
};
esp_err_t ret = spi_device_transmit(spi_handle(slot), t_command);
if (ret != ESP_OK) {
return ret;
}
release_transaction(slot);
uint8_t* cmd_u8 = (uint8_t*) cmd;
size_t pre_scan_data_size = SDSPI_RESPONSE_MAX_DELAY;
uint8_t* pre_scan_data_ptr = cmd_u8 + SDSPI_CMD_R1_SIZE;
/* R1 response is delayed by 1-8 bytes from the request.
* This loop searches for the response and writes it to cmd->r1.
*/
while ((cmd->r1 & SD_SPI_R1_NO_RESPONSE) != 0 && pre_scan_data_size > 0) {
cmd->r1 = *pre_scan_data_ptr;
++pre_scan_data_ptr;
--pre_scan_data_size;
}
if (cmd->r1 & SD_SPI_R1_NO_RESPONSE) {
ESP_LOGD(TAG, "no response token found");
return ESP_ERR_TIMEOUT;
}
while (rx_length > 0) {
size_t extra_data_size = 0;
const uint8_t* extra_data_ptr = NULL;
bool need_poll = true;
for (int i = 0; i < pre_scan_data_size; ++i) {
if (pre_scan_data_ptr[i] == TOKEN_BLOCK_START) {
extra_data_size = pre_scan_data_size - i - 1;
extra_data_ptr = pre_scan_data_ptr + i + 1;
need_poll = false;
break;
}
}
if (need_poll) {
// Wait for data to be ready
spi_transaction_t* t_poll = get_transaction(slot);
ret = poll_data_token(slot, t_poll, cmd_u8 + SDSPI_CMD_R1_SIZE, &extra_data_size, cmd->timeout_ms);
release_transaction(slot);
if (ret != ESP_OK) {
return ret;
}
if (extra_data_size) {
extra_data_ptr = cmd_u8 + SDSPI_CMD_R1_SIZE;
}
}
// Arrange RX buffer
size_t will_receive = MIN(rx_length, SDSPI_MAX_DATA_LEN) - extra_data_size;
uint8_t* rx_data;
ret = get_block_buf(slot, &rx_data);
if (ret != ESP_OK) {
return ret;
}
// receive actual data
const size_t receive_extra_bytes = (rx_length > SDSPI_MAX_DATA_LEN) ? 4 : 2;
memset(rx_data, 0xff, will_receive + receive_extra_bytes);
spi_transaction_t* t_data = get_transaction(slot);
*t_data = (spi_transaction_t) {
.length = (will_receive + receive_extra_bytes) * 8,
.rx_buffer = rx_data,
.tx_buffer = rx_data
};
ret = spi_device_transmit(spi_handle(slot), t_data);
if (ret != ESP_OK) {
return ret;
}
release_transaction(slot);
// CRC bytes need to be received even if CRC is not enabled
uint16_t crc = UINT16_MAX;
memcpy(&crc, rx_data + will_receive, sizeof(crc));
// Bytes to scan for the start token
pre_scan_data_size = receive_extra_bytes - sizeof(crc);
pre_scan_data_ptr = rx_data + will_receive + sizeof(crc);
// Copy data to the destination buffer
memcpy(data + extra_data_size, rx_data, will_receive);
if (extra_data_size) {
memcpy(data, extra_data_ptr, extra_data_size);
}
// compute CRC of the received data
uint16_t crc_of_data = 0;
if (data_crc_enabled(slot)) {
crc_of_data = sdspi_crc16(data, will_receive + extra_data_size);
if (crc_of_data != crc) {
ESP_LOGE(TAG, "data CRC failed, got=0x%04x expected=0x%04x", crc_of_data, crc);
esp_log_buffer_hex(TAG, data, 16);
return ESP_ERR_INVALID_CRC;
}
}
data += will_receive + extra_data_size;
rx_length -= will_receive + extra_data_size;
extra_data_size = 0;
extra_data_ptr = NULL;
}
if (need_stop_command) {
// To end multi block transfer, send stop command and wait for the
// card to process it
sdspi_hw_cmd_t stop_cmd;
make_hw_cmd(MMC_STOP_TRANSMISSION, 0, cmd->timeout_ms, &stop_cmd);
ret = start_command_default(slot, SDSPI_CMD_FLAG_RSP_R1, &stop_cmd);
if (ret != ESP_OK) {
return ret;
}
if (stop_cmd.r1 != 0) {
ESP_LOGD(TAG, "%s: STOP_TRANSMISSION response 0x%02x", __func__, stop_cmd.r1);
}
spi_transaction_t* t_poll = get_transaction(slot);
ret = poll_busy(slot, t_poll, cmd->timeout_ms);
release_transaction(slot);
if (ret != ESP_OK) {
return ret;
}
}
return ESP_OK;
}
static esp_err_t start_command_write_blocks(int slot, sdspi_hw_cmd_t *cmd,
const uint8_t *data, uint32_t tx_length)
{
if (card_write_protected(slot)) {
ESP_LOGW(TAG, "%s: card write protected", __func__);
return ESP_ERR_INVALID_STATE;
}
spi_transaction_t* t_command = get_transaction(slot);
*t_command = (spi_transaction_t) {
.length = SDSPI_CMD_R1_SIZE * 8,
.tx_buffer = cmd,
.rx_buffer = cmd,
};
esp_err_t ret = spi_device_queue_trans(spi_handle(slot), t_command, 0);
if (ret != ESP_OK) {
return ret;
}
uint8_t start_token = tx_length <= SDSPI_MAX_DATA_LEN ?
TOKEN_BLOCK_START : TOKEN_BLOCK_START_WRITE_MULTI;
wait_for_transactions(slot);
while (tx_length > 0) {
// Write block start token
spi_transaction_t* t_start_token = get_transaction(slot);
*t_start_token = (spi_transaction_t) {
.length = sizeof(start_token) * 8,
.tx_buffer = &start_token
};
esp_err_t ret = spi_device_queue_trans(spi_handle(slot), t_start_token, 0);
if (ret != ESP_OK) {
return ret;
}
// Prepare data to be sent
size_t will_send = MIN(tx_length, SDSPI_MAX_DATA_LEN);
const uint8_t* tx_data = data;
if (!ptr_dma_compatible(tx_data)) {
// If the pointer can't be used with DMA, copy data into a new buffer
uint8_t* tmp;
ret = get_block_buf(slot, &tmp);
if (ret != ESP_OK) {
return ret;
}
memcpy(tmp, tx_data, will_send);
tx_data = tmp;
}
// Write data
spi_transaction_t* t_data = get_transaction(slot);
*t_data = (spi_transaction_t) {
.length = will_send * 8,
.tx_buffer = tx_data,
};
ret = spi_device_queue_trans(spi_handle(slot), t_data, 0);
if (ret != ESP_OK) {
return ret;
}
// Write CRC
uint16_t crc = sdspi_crc16(data, will_send);
spi_transaction_t* t_crc = get_transaction(slot);
*t_crc = (spi_transaction_t) {
.length = sizeof(crc) * 8,
.tx_buffer = (uint8_t*) &crc,
};
ret = spi_device_queue_trans(spi_handle(slot), t_crc, 0);
if (ret != ESP_OK) {
return ret;
}
// Wait for data to be sent
wait_for_transactions(slot);
// Check if R1 response for the command was correct
if (cmd->r1 != 0) {
ESP_LOGD(TAG, "%s: invalid R1 response: 0x%02x", __func__, cmd->r1);
return ESP_ERR_INVALID_RESPONSE;
}
// Poll for response
spi_transaction_t* t_poll = get_transaction(slot);
ret = poll_response_token(slot, t_poll, cmd->timeout_ms);
release_transaction(slot);
if (ret != ESP_OK) {
return ret;
}
// Wait for the card to finish writing data
t_poll = get_transaction(slot);
ret = poll_busy(slot, t_poll, cmd->timeout_ms);
release_transaction(slot);
if (ret != ESP_OK) {
return ret;
}
tx_length -= will_send;
data += will_send;
}
if (start_token == TOKEN_BLOCK_START_WRITE_MULTI) {
uint8_t stop_token[2] = {
TOKEN_BLOCK_STOP_WRITE_MULTI,
SDSPI_MOSI_IDLE_VAL
};
spi_transaction_t* t_stop_token = get_transaction(slot);
*t_stop_token = (spi_transaction_t) {
.length = sizeof(stop_token) * 8,
.tx_buffer = &stop_token,
};
ret = spi_device_queue_trans(spi_handle(slot), t_stop_token, 0);
if (ret != ESP_OK) {
return ret;
}
wait_for_transactions(slot);
spi_transaction_t* t_poll = get_transaction(slot);
ret = poll_busy(slot, t_poll, cmd->timeout_ms);
release_transaction(slot);
if (ret != ESP_OK) {
return ret;
}
}
return ESP_OK;
}
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