93 lines
3.2 KiB
C
93 lines
3.2 KiB
C
/* SPIFFS filesystem example.
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "esp_err.h"
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#include "esp_log.h"
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#include "esp_vfs_semihost.h"
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static const char *TAG = "example";
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#define STRINGIFY(s) STRINGIFY2(s)
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#define STRINGIFY2(s) #s
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static uint8_t s_buf[512];
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void app_main(void)
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{
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// Register host FS at '/host'. On the host file will be written/read in the current semihosting dir of OpenOCD
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esp_err_t ret = esp_vfs_semihost_register("/host", NULL);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to register semihost driver (%s)!", esp_err_to_name(ret));
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return;
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}
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ESP_LOGW(TAG, "Switch to semihosted stdout");
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FILE *fout = freopen("/host/esp32_stdout.txt", "w", stdout);
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if (fout == NULL) {
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ESP_LOGE(TAG, "Failed to reopen stdout (%d)!", errno);
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return;
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}
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// Increase file buffer to perform data transfers using larger chunks.
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// Every read/write triggers breakpoint, so transfering of small chunks is quite inefficient.
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setvbuf(fout, (char *)s_buf, _IOFBF, sizeof(s_buf));
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// this will be printed to the file on host
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ESP_LOGW(TAG, "Switched to semihosted stdout");
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for (int i = 0; i < 100; i++) {
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// printf is also redirected and sends data to the file on host
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printf("Semihosted stdout write %d\n", i);
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}
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ESP_LOGW(TAG, "Switch to UART stdout");
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fflush(fout); // ensure that all data are sent to the host file
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// ftell can also be used, get file size before closing it in `freopen`
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int count = ftell(fout);
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stdout = freopen("/dev/uart/" STRINGIFY(CONFIG_ESP_CONSOLE_UART_NUM), "w", fout);
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if (stdout == NULL) {
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ESP_LOGE(TAG, "Failed to reopen semihosted stdout (%d)!", errno);
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return;
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}
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// all remaining messages will be printed to UART
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ESP_LOGW(TAG, "Switched back to UART stdout");
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ESP_LOGI(TAG, "Wrote %d bytes", count);
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printf("====================== HOST DATA START =========================\n");
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// open() can also be used to access files on the host
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int fd = open("/host/host_file.txt", O_RDONLY, 0);
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if (fd == -1) {
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ESP_LOGE(TAG, "Failed to open file (%d)!", errno);
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return;
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}
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ssize_t read_bytes;
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count = 0;
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do {
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read_bytes = read(fd, s_buf, sizeof(s_buf));
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if(read_bytes == -1) {
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ESP_LOGE(TAG, "Failed to read file (%d)!", errno);
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} else if(read_bytes > 0) {
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fwrite(s_buf, 1, read_bytes, stdout);
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count += read_bytes;
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}
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} while(read_bytes > 0);
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printf("====================== HOST DATA END =========================\n");
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ESP_LOGI(TAG, "Read %d bytes", count);
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if (close(fd) == -1) {
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ESP_LOGE(TAG, "Failed to close file (%d)!", errno);
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}
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ret = esp_vfs_semihost_unregister("/host");
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to unregister semihost driver (%s)!", esp_err_to_name(ret));
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}
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}
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