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esp-idf/components/app_trace/host_file_io.c
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Erhan Kurubas f1d43df4a1 feat(examples): dump coverage over uart
2026-01-20 11:30:03 +03:00

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/*
* SPDX-FileCopyrightText: 2017-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
//
// Hot It Works
// ************
//
// This module implements host file I/O protocol on top of apptrace module.
// The protocol is enough simple. It sends command with arguments to the host and receives response from it.
// Responses contains return values of respective file I/O API. This value is returned to the caller.
// Commands has the following format:
// * Header. See esp_apptrace_fcmd_hdr_t.
// * Operation arguments. See file operation helper structures below.
#include <string.h>
#include <stdbool.h>
#include "esp_app_trace.h"
#include "esp_log.h"
const static char *TAG = "esp_host_file_io";
#define ESP_APPTRACE_FILE_CMD_FOPEN 0x0
#define ESP_APPTRACE_FILE_CMD_FCLOSE 0x1
#define ESP_APPTRACE_FILE_CMD_FWRITE 0x2
#define ESP_APPTRACE_FILE_CMD_FREAD 0x3
#define ESP_APPTRACE_FILE_CMD_FSEEK 0x4
#define ESP_APPTRACE_FILE_CMD_FTELL 0x5
#define ESP_APPTRACE_FILE_CMD_STOP 0x6 // indicates that there is no files to transfer
#define ESP_APPTRACE_FILE_CMD_FEOF 0x7
/** File operation header */
typedef struct {
uint8_t cmd; ///< Command ID
} esp_apptrace_fcmd_hdr_t;
/** Helper structure for fopen */
typedef struct {
const char *path;
uint16_t path_len;
const char *mode;
uint16_t mode_len;
} esp_apptrace_fopen_args_t;
/** Helper structure for fclose */
typedef struct {
void *file;
} esp_apptrace_fclose_args_t;
/** Helper structure for fwrite */
typedef struct {
void * buf;
size_t size;
void * file;
} esp_apptrace_fwrite_args_t;
/** Helper structure for fread */
typedef struct {
size_t size;
void * file;
} esp_apptrace_fread_args_t;
/** Helper structure for fseek */
typedef struct {
long offset;
int whence;
void * file;
} esp_apptrace_fseek_args_t;
/** Helper structure for feof */
typedef struct {
void *file;
} esp_apptrace_feof_args_t;
/** Helper structure for ftell */
typedef struct {
void *file;
} esp_apptrace_ftell_args_t;
#define ESP_APPTRACE_FILE_RECV_TIMEOUT_US 100000 // 100ms
#define ESP_APPTRACE_FRAME_STX 0x02
#define ESP_APPTRACE_FRAME_ETX 0x03
/**
* Send a file command to the host.
* For the UART destination, the command is wrapped in a frame protocol.
* The frame protocol is as follows:
* - STX (0x02)
* - Length of the command and arguments (2 bytes)
* - Command ID (1 byte)
* - Arguments (variable length)
* - ETX (0x03)
*/
static esp_err_t esp_apptrace_file_cmd_send(uint8_t cmd, void (*prep_args)(uint8_t *, void *), void *args, uint32_t args_len)
{
const bool is_uart = esp_apptrace_get_destination() == ESP_APPTRACE_DEST_UART;
const size_t payload_off = is_uart ? 3u : 0u; // STX + LEN
const size_t payload_len = sizeof(cmd) + (size_t)args_len; // CMD + ARGS
const size_t total_len = payload_off + payload_len + (is_uart ? 1u /*ETX*/ : 0u);
size_t inx = 0;
if (is_uart && payload_len > 0xFFFFu) {
return ESP_ERR_INVALID_SIZE;
}
ESP_EARLY_LOGV(TAG, "%s cmd:%d len:%d", __func__, cmd, total_len);
uint8_t *buf = esp_apptrace_buffer_get(total_len, ESP_APPTRACE_TMO_INFINITE);
if (!buf) {
return ESP_ERR_NO_MEM;
}
if (is_uart) {
buf[inx++] = ESP_APPTRACE_FRAME_STX;
buf[inx++] = (uint8_t)(payload_len & 0xFF);
buf[inx++] = (uint8_t)((payload_len >> 8) & 0xFF);
}
// Payload: CMD then ARGS
buf[inx++] = cmd;
if (args_len) {
prep_args(&buf[inx], args);
inx += args_len;
}
if (is_uart) {
buf[inx++] = ESP_APPTRACE_FRAME_ETX;
}
// now indicate that this buffer is ready to be sent off to host
esp_err_t ret = esp_apptrace_buffer_put(buf, ESP_APPTRACE_TMO_INFINITE);//TODO: finite tmo
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to put apptrace buffer (%d)!", ret);
return ret;
}
ret = esp_apptrace_flush(ESP_APPTRACE_TMO_INFINITE);//TODO: finite tmo
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to flush apptrace buffer (%d)!", ret);
return ret;
}
return ESP_OK;
}
static esp_err_t esp_apptrace_file_rsp_recv(uint8_t *buf, uint32_t buf_len)
{
uint32_t tot_rd = 0;
while (tot_rd < buf_len) {
uint32_t rd_size = buf_len - tot_rd;
esp_err_t ret = esp_apptrace_read(buf + tot_rd, &rd_size, ESP_APPTRACE_FILE_RECV_TIMEOUT_US);
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read (%d)!", ret);
return ret;
}
ESP_EARLY_LOGV(TAG, "%s read %" PRIu32 " bytes", __FUNCTION__, rd_size);
tot_rd += rd_size;
}
return ESP_OK;
}
static void esp_apptrace_fopen_args_prepare(uint8_t *buf, void *priv)
{
esp_apptrace_fopen_args_t *args = priv;
memcpy(buf, args->path, args->path_len);
memcpy(buf + args->path_len, args->mode, args->mode_len);
}
void *esp_apptrace_fopen(const char *path, const char *mode)
{
esp_apptrace_fopen_args_t cmd_args;
ESP_EARLY_LOGV(TAG, "esp_apptrace_fopen '%s' '%s'", path, mode);
if (path == NULL || mode == NULL) {
return 0;
}
cmd_args.path = path;
cmd_args.path_len = strlen(path) + 1;
cmd_args.mode = mode;
cmd_args.mode_len = strlen(mode) + 1;
esp_err_t ret = esp_apptrace_file_cmd_send(ESP_APPTRACE_FILE_CMD_FOPEN, esp_apptrace_fopen_args_prepare,
&cmd_args, cmd_args.path_len + cmd_args.mode_len);
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to send file cmd (%d)!", ret);
return NULL;
}
// now read the answer
void *resp;
ret = esp_apptrace_file_rsp_recv((uint8_t *)&resp, sizeof(resp));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read response (%d)!", ret);
return NULL;
}
return resp;
}
static void esp_apptrace_fclose_args_prepare(uint8_t *buf, void *priv)
{
esp_apptrace_fclose_args_t *args = priv;
memcpy(buf, &args->file, sizeof(args->file));
}
int esp_apptrace_fclose(void *stream)
{
esp_apptrace_fclose_args_t cmd_args;
cmd_args.file = stream;
esp_err_t ret = esp_apptrace_file_cmd_send(ESP_APPTRACE_FILE_CMD_FCLOSE, esp_apptrace_fclose_args_prepare,
&cmd_args, sizeof(cmd_args));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to send file cmd (%d)!", ret);
return EOF;
}
// now read the answer
int resp;
ret = esp_apptrace_file_rsp_recv((uint8_t *)&resp, sizeof(resp));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read response (%d)!", ret);
return EOF;
}
return resp;
}
static void esp_apptrace_fwrite_args_prepare(uint8_t *buf, void *priv)
{
esp_apptrace_fwrite_args_t *args = priv;
memcpy(buf, &args->file, sizeof(args->file));
memcpy(buf + sizeof(args->file), args->buf, args->size);
}
size_t esp_apptrace_fwrite(const void *ptr, size_t size, size_t nmemb, void *stream)
{
esp_apptrace_fwrite_args_t cmd_args;
ESP_EARLY_LOGV(TAG, "esp_apptrace_fwrite f %p l %d", stream, size * nmemb);
if (ptr == NULL) {
return 0;
}
cmd_args.buf = (void *)ptr;
cmd_args.size = size * nmemb;
cmd_args.file = stream;
esp_err_t ret = esp_apptrace_file_cmd_send(ESP_APPTRACE_FILE_CMD_FWRITE, esp_apptrace_fwrite_args_prepare,
&cmd_args, sizeof(cmd_args.file) + cmd_args.size);
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to send file cmd (%d)!", ret);
return 0;
}
// now read the answer
size_t resp;
ret = esp_apptrace_file_rsp_recv((uint8_t *)&resp, sizeof(resp));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read response (%d)!", ret);
return 0;
}
/* OpenOCD writes it like that:
* fwrite(buf, size, 1, file);
* So, if 1 was returned that means fwrite succeed
*/
return resp == 1 ? nmemb : 0;
}
static void esp_apptrace_fread_args_prepare(uint8_t *buf, void *priv)
{
esp_apptrace_fread_args_t *args = priv;
memcpy(buf, &args->file, sizeof(args->file));
memcpy(buf + sizeof(args->file), &args->size, sizeof(args->size));
}
size_t esp_apptrace_fread(void *ptr, size_t size, size_t nmemb, void *stream)
{
esp_apptrace_fread_args_t cmd_args;
ESP_EARLY_LOGV(TAG, "esp_apptrace_fread f %p l %d", stream, size * nmemb);
if (ptr == NULL) {
return 0;
}
cmd_args.size = size * nmemb;
cmd_args.file = stream;
esp_err_t ret = esp_apptrace_file_cmd_send(ESP_APPTRACE_FILE_CMD_FREAD, esp_apptrace_fread_args_prepare,
&cmd_args, sizeof(cmd_args));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to send file cmd (%d)!", ret);
return 0;
}
// now read the answer
size_t resp;
ret = esp_apptrace_file_rsp_recv((uint8_t *)&resp, sizeof(resp));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read response (%d)!", ret);
return 0;
}
if (resp == 0) {
return 0;
}
ret = esp_apptrace_file_rsp_recv(ptr, resp);
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read file data (%d)!", ret);
return 0;
}
/* OpenOCD reads it like that:
* fread(buf, 1 ,size, file);
* So, total read bytes count returns
*/
return resp / size; // return the number of items read
}
static void esp_apptrace_fseek_args_prepare(uint8_t *buf, void *priv)
{
esp_apptrace_fseek_args_t *args = priv;
memcpy(buf, &args->file, sizeof(args->file));
memcpy(buf + sizeof(args->file), &args->offset, sizeof(args->offset));
memcpy(buf + sizeof(args->file) + sizeof(args->offset), &args->whence, sizeof(args->whence));
}
int esp_apptrace_fseek(void *stream, long offset, int whence)
{
esp_apptrace_fseek_args_t cmd_args;
ESP_EARLY_LOGV(TAG, "esp_apptrace_fseek f %p o 0x%lx w %d", stream, offset, whence);
cmd_args.file = stream;
cmd_args.offset = offset;
cmd_args.whence = whence;
esp_err_t ret = esp_apptrace_file_cmd_send(ESP_APPTRACE_FILE_CMD_FSEEK, esp_apptrace_fseek_args_prepare,
&cmd_args, sizeof(cmd_args));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to send file cmd (%d)!", ret);
return -1;
}
// now read the answer
int resp;
ret = esp_apptrace_file_rsp_recv((uint8_t *)&resp, sizeof(resp));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read response (%d)!", ret);
return -1;
}
return resp;
}
static void esp_apptrace_ftell_args_prepare(uint8_t *buf, void *priv)
{
esp_apptrace_ftell_args_t *args = priv;
memcpy(buf, &args->file, sizeof(args->file));
}
int esp_apptrace_ftell(void *stream)
{
esp_apptrace_ftell_args_t cmd_args;
cmd_args.file = stream;
esp_err_t ret = esp_apptrace_file_cmd_send(ESP_APPTRACE_FILE_CMD_FTELL, esp_apptrace_ftell_args_prepare,
&cmd_args, sizeof(cmd_args));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to send file cmd (%d)!", ret);
return -1;
}
// now read the answer
int resp;
ret = esp_apptrace_file_rsp_recv((uint8_t *)&resp, sizeof(resp));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read response (%d)!", ret);
return -1;
}
return resp;
}
int esp_apptrace_fstop(void)
{
ESP_EARLY_LOGV(TAG, "%s", __func__);
esp_err_t ret = esp_apptrace_file_cmd_send(ESP_APPTRACE_FILE_CMD_STOP, NULL, NULL, 0);
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to send files transfer stop cmd (%d)!", ret);
}
return ret;
}
static void esp_apptrace_feof_args_prepare(uint8_t *buf, void *priv)
{
esp_apptrace_feof_args_t *args = priv;
memcpy(buf, &args->file, sizeof(args->file));
}
int esp_apptrace_feof(void *stream)
{
esp_apptrace_feof_args_t cmd_args;
cmd_args.file = stream;
esp_err_t ret = esp_apptrace_file_cmd_send(ESP_APPTRACE_FILE_CMD_FEOF, esp_apptrace_feof_args_prepare,
&cmd_args, sizeof(cmd_args));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to send file cmd (%d)!", ret);
return EOF;
}
// now read the answer
int resp;
ret = esp_apptrace_file_rsp_recv((uint8_t *)&resp, sizeof(resp));
if (ret != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to read response (%d)!", ret);
return EOF;
}
return resp;
}
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