Add webusb mode

main/CMakeLists.txt

@@ -25,6 +25,7 @@ idf_component_register(
          "animation.c"
          "button_test.c"
          "adc_test.c"
+         "webusb.c"
     INCLUDE_DIRS "."
                  "include"
                  "menus"

main/include/webusb.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include "ice40.h"
+#include "pax_gfx.h"
+#include "ili9341.h"
+#include <freertos/FreeRTOS.h>
+
+void webusb_main(xQueueHandle buttonQueue, pax_buf_t* pax_buffer, ILI9341* ili9341);

main/main.c

@@ -50,6 +50,7 @@
 
 #include "factory_test.h"
 #include "fpga_download.h"
+#include "webusb.h"
 
 extern const uint8_t wallpaper_png_start[] asm("_binary_wallpaper_png_start");
 extern const uint8_t wallpaper_png_end[] asm("_binary_wallpaper_png_end");
@@ -73,6 +74,8 @@ void display_fatal_error(pax_buf_t* pax_buffer, ILI9341* ili9341, const char* li
 void app_main(void) {
     esp_err_t res;
     
+    audio_init();
+    
     const esp_app_desc_t *app_description = esp_ota_get_app_description();
     ESP_LOGI(TAG, "App version: %s", app_description->version);
     //ESP_LOGI(TAG, "Project name: %s", app_description->project_name);
@@ -116,8 +119,6 @@ void app_main(void) {
         display_fatal_error(pax_buffer, ili9341, "Failed to initialize", "NVS failed to initialize", "Flash may be corrupted", NULL);
         esp_restart();
     }
-    
-    audio_init();
 
     display_boot_screen(pax_buffer, ili9341, "Starting...");
 
@@ -258,9 +259,9 @@ void app_main(void) {
         }
     } else if (webusb_mode == 0x01) {
         display_boot_screen(pax_buffer, ili9341, "WebUSB mode");
-        /*while (true) {
-            
-        }*/
+        while (true) {
+            webusb_main(rp2040->queue, pax_buffer, ili9341);
+        }
     } else if (webusb_mode == 0x02) {
         display_boot_screen(pax_buffer, ili9341, "FPGA download mode");
         while (true) {

main/webusb.c

@@ -0,0 +1,117 @@
+#include <stdio.h>
+#include <string.h>
+#include <sdkconfig.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <freertos/queue.h>
+#include <esp_system.h>
+#include <esp_err.h>
+#include <esp_log.h>
+#include "driver/uart.h"
+#include "hardware.h"
+#include "managed_i2c.h"
+#include "pax_gfx.h"
+#include "ice40.h"
+#include "system_wrapper.h"
+#include "graphics_wrapper.h"
+#include "esp32/rom/crc.h"
+
+void webusb_install_uart() {
+    fflush(stdout);
+    ESP_ERROR_CHECK(uart_driver_install(0, 2048, 0, 0, NULL, 0));
+    uart_config_t uart_config = {
+        .baud_rate  = 921600,
+        .data_bits  = UART_DATA_8_BITS,
+        .parity     = UART_PARITY_DISABLE,
+        .stop_bits  = UART_STOP_BITS_1,
+        .flow_ctrl  = UART_HW_FLOWCTRL_DISABLE,
+        .source_clk = UART_SCLK_APB,
+    };
+    ESP_ERROR_CHECK(uart_param_config(0, &uart_config));
+}
+
+void webusb_uninstall_uart() {
+    uart_driver_delete(0);
+}
+
+bool webusb_read_stdin(uint8_t* buffer, uint32_t len, uint32_t timeout) {
+    int read = uart_read_bytes(0, buffer, len, timeout / portTICK_PERIOD_MS);
+    return (read == len);
+}
+
+bool webusb_uart_sync(uint32_t* length, uint32_t* crc) {
+    uint8_t rx_buffer[4*3];
+    webusb_read_stdin(rx_buffer, sizeof(rx_buffer), 100);
+    if (memcmp(rx_buffer, "WUSB", 4) != 0) return false;
+    memcpy((uint8_t*) length, &rx_buffer[4 * 1], 4);
+    memcpy((uint8_t*) crc, &rx_buffer[4 * 2], 4);
+    return true;
+}
+
+bool webusb_uart_load(uint8_t* buffer, uint32_t length) {
+    return webusb_read_stdin(buffer, length, 3000);
+}
+
+void webusb_uart_mess(const char *mess) {
+    uart_write_bytes(0, mess, strlen(mess));
+}
+
+void webusb_print_status(pax_buf_t* pax_buffer, ILI9341* ili9341, char* message) {
+    pax_noclip(pax_buffer);
+    pax_background(pax_buffer, 0x325aa8);
+    pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*0, "WebUSB mode");
+    pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*1, message);
+    ili9341_write(ili9341, pax_buffer->buf);
+}
+
+void webusb_main(xQueueHandle buttonQueue, pax_buf_t* pax_buffer, ILI9341* ili9341) {
+    webusb_install_uart();
+
+    while (true) {
+        webusb_print_status(pax_buffer, ili9341, "Waiting...");
+
+        // 1) Wait for WUSB followed by data length as uint32 and CRC32 of the data as uint32
+        uint32_t length, crc;
+        while (!webusb_uart_sync(&length, &crc)) {
+            webusb_uart_mess("WUSB");
+        }
+
+        webusb_print_status(pax_buffer, ili9341, "Receiving...");
+
+        // 2) Allocate RAM for the data to be received
+        uint8_t* buffer = malloc(length);
+        if (buffer == NULL) {
+            webusb_uart_mess("EMEM");
+            webusb_print_status(pax_buffer, ili9341, "Error: malloc failed");
+            vTaskDelay(100 / portTICK_PERIOD_MS);
+            continue;
+        }
+
+        // 3) Receive data into the buffer
+        if (!webusb_uart_load(buffer, length)) {
+            free(buffer);
+            webusb_uart_mess("ERCV");
+            webusb_print_status(pax_buffer, ili9341, "Error: receive failed");
+            vTaskDelay(100 / portTICK_PERIOD_MS);
+            continue;
+        }
+
+        // 4) Check CRC
+        uint32_t checkCrc = crc32_le(0, buffer, length);
+        
+        if (checkCrc != crc) {
+            free(buffer);
+            webusb_uart_mess("ECRC");
+            webusb_print_status(pax_buffer, ili9341, "Error: CRC invalid");
+            vTaskDelay(100 / portTICK_PERIOD_MS);
+            continue;
+        }
+
+        webusb_uart_mess("OKOK");
+        webusb_print_status(pax_buffer, ili9341, "Packet received");
+
+        // To-do: parse packet
+    }
+    
+    webusb_uninstall_uart();
+}