76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
#include "usb_api.h"
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#include <string.h>
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#include "esp_err.h"
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#include "esp_log.h"
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#include "driver/usb_serial_jtag.h"
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static const char *TAG = "usb_api";
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static usb_api_line_handler_t s_handler = NULL;
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static char s_line_buf[256];
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static size_t s_line_len = 0;
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void usb_api_init(usb_api_line_handler_t handler)
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{
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s_handler = handler;
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s_line_len = 0;
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usb_serial_jtag_driver_config_t cfg = USB_SERIAL_JTAG_DRIVER_CONFIG_DEFAULT();
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esp_err_t err = usb_serial_jtag_driver_install(&cfg);
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if (err != ESP_OK && err != ESP_ERR_INVALID_STATE) {
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ESP_LOGE(TAG, "usb driver install failed: %s", esp_err_to_name(err));
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}
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}
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bool usb_api_is_connected(void)
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{
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return usb_serial_jtag_is_connected();
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}
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void usb_api_send_line(const char *line)
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{
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if (!line) {
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return;
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}
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size_t len = strlen(line);
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if (len == 0) {
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return;
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}
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int written = usb_serial_jtag_write_bytes((const uint8_t *)line, len, 0);
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if (written < 0) {
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ESP_LOGW(TAG, "usb write failed");
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}
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}
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static void handle_complete_line(void)
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{
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if (s_line_len == 0) {
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return;
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}
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s_line_buf[s_line_len] = '\0';
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if (s_handler) {
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s_handler(s_line_buf);
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}
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s_line_len = 0;
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}
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void usb_api_tick(void)
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{
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uint8_t buf[64];
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int n = usb_serial_jtag_read_bytes(buf, sizeof(buf), 0);
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if (n <= 0) {
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return;
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}
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for (int i = 0; i < n; i++) {
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char c = (char)buf[i];
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if (c == '\r' || c == '\n') {
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handle_complete_line();
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continue;
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}
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if (s_line_len + 1 >= sizeof(s_line_buf)) {
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// drop line on overflow
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s_line_len = 0;
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continue;
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}
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s_line_buf[s_line_len++] = c;
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}
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}
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