Add FPGA download mode

main/CMakeLists.txt

@@ -1,5 +1,5 @@
 idf_component_register(
-    SRCS "main.c" "menu.c" "fpga_test.c" "pax_keyboard.c" "system_wrapper.c" "appfs_wrapper.c" "graphics_wrapper.c" "settings.c" "wifi_connection.c" "rp2040_updater.c" "wifi_ota.c"
+    SRCS "main.c" "menu.c" "fpga_test.c" "pax_keyboard.c" "system_wrapper.c" "appfs_wrapper.c" "graphics_wrapper.c" "settings.c" "wifi_connection.c" "rp2040_updater.c" "wifi_ota.c" "fpga_download.c"
     INCLUDE_DIRS "." "include"
     EMBED_TXTFILES ${project_dir}/server_certs/isrgrootx1.pem
 )

main/fpga_download.c

@@ -0,0 +1,163 @@
+#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 fpga_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 fpga_uninstall_uart() {
+    uart_driver_delete(0);
+}
+
+bool fpga_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 fpga_uart_sync(uint32_t* length, uint32_t* crc) {
+    uint8_t data[256];
+    uart_read_bytes(0, data, sizeof(data), 10 / portTICK_PERIOD_MS);
+    char command[] = "FPGA";
+    uart_write_bytes(0, command, 4);
+    uint8_t rx_buffer[4 * 3];
+    fpga_read_stdin(rx_buffer, sizeof(rx_buffer), 1000);
+    if (memcmp(rx_buffer, "FPGA", 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 fpga_uart_load(uint8_t* buffer, uint32_t length) {
+    return fpga_read_stdin(buffer, length, 3000);
+}
+
+void fpga_download(ICE40* ice40, pax_buf_t* pax_buffer, ILI9341* ili9341) {
+    char message[64];
+
+    pax_noclip(pax_buffer);
+    pax_background(pax_buffer, 0x325aa8);
+    pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*0, "FPGA download mode");
+    pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*1, "Preparing...");
+    ili9341_write(ili9341, pax_buffer->buf);
+    
+    fpga_install_uart();
+    
+    ice40_disable(ice40);
+    ili9341_init(ili9341);
+    
+    uint8_t counter = 0;
+    uint32_t length = 0;
+    uint32_t crc = 0;
+    while (!fpga_uart_sync(&length, &crc)) {
+        pax_noclip(pax_buffer);
+        pax_background(pax_buffer, 0x325aa8);
+        pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*0, "FPGA download mode");
+        snprintf(message, sizeof(message), "Waiting for bitstream%s%s%s", (counter > 0) ? "." : " ", (counter > 1) ? "." : " ", (counter > 2) ? "." : " ");
+        pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*1, message);
+        ili9341_write(ili9341, pax_buffer->buf);
+        counter++;
+        if (counter > 3) counter = 0;
+    }
+    
+    while (true) {
+        pax_noclip(pax_buffer);
+        pax_background(pax_buffer, 0x325aa8);
+        pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*0, "FPGA download mode");
+        pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*1, "Receiving bitstream...");
+        ili9341_write(ili9341, pax_buffer->buf);
+        
+        uint8_t* buffer = malloc(length);
+        if (buffer == NULL) {
+            free(buffer);
+            pax_noclip(pax_buffer);
+            pax_background(pax_buffer, 0xa85a32);
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*0, "FPGA download mode");
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*1, "Malloc failed");
+            ili9341_write(ili9341, pax_buffer->buf);
+            vTaskDelay(1000 / portTICK_PERIOD_MS);
+            fpga_uninstall_uart();
+            return;
+        }
+        if (!fpga_uart_load(buffer, length)) {
+            free(buffer);
+            pax_noclip(pax_buffer);
+            pax_background(pax_buffer, 0xa85a32);
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*0, "FPGA download mode");
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*1, "Timeout while loading");
+            ili9341_write(ili9341, pax_buffer->buf);
+            vTaskDelay(1000 / portTICK_PERIOD_MS);
+            fpga_uninstall_uart();
+            return;
+        }
+        
+        uint32_t checkCrc = crc32_le(0, buffer, length);
+        
+        if (checkCrc != crc) {
+            free(buffer);
+            pax_noclip(pax_buffer);
+            pax_background(pax_buffer, 0xa85a32);
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*0, "FPGA download mode");
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*1, "CRC incorrect");
+            snprintf(message, sizeof(message), "Provided CRC:   %08X", crc);
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*2, message);
+            snprintf(message, sizeof(message), "Calculated CRC: %08X", checkCrc);
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*3, message);
+            ili9341_write(ili9341, pax_buffer->buf);
+            vTaskDelay(1000 / portTICK_PERIOD_MS);
+            fpga_uninstall_uart();
+            return;
+        }
+        
+        ili9341_deinit(ili9341);
+        ili9341_select(ili9341, false);
+        vTaskDelay(200 / portTICK_PERIOD_MS);
+        ili9341_select(ili9341, true);
+
+        esp_err_t res = ice40_load_bitstream(ice40, buffer, length);
+        free(buffer);
+        
+        if (res == ESP_OK) {
+            while (!fpga_uart_sync(&length, &crc)) {
+                vTaskDelay(2 / portTICK_PERIOD_MS);
+            }
+            ice40_disable(ice40);
+            ili9341_init(ili9341);
+        } else {
+            ice40_disable(ice40);
+            ili9341_init(ili9341);
+            pax_noclip(pax_buffer);
+            pax_background(pax_buffer, 0xa85a32);
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*0, "FPGA download mode");
+            pax_draw_text(pax_buffer, 0xFFFFFFFF, NULL, 18, 0, 20*1, "FPGA signals not done");
+            ili9341_write(ili9341, pax_buffer->buf);
+            vTaskDelay(1000 / portTICK_PERIOD_MS);
+            fpga_uninstall_uart();
+            return;
+        }
+    }
+}

main/include/fpga_download.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include "ice40.h"
+#include "pax_gfx.h"
+#include "ili9341.h"
+
+void fpga_download(ICE40* ice40, pax_buf_t* pax_buffer, ILI9341* ili9341);

main/main.c

@@ -40,6 +40,8 @@
 #include "esp_vfs.h"
 #include "esp_vfs_fat.h"
 
+#include "fpga_download.h"
+
 static const char *TAG = "main";
 
 typedef enum action {
@@ -49,6 +51,7 @@ typedef enum action {
     ACTION_SETTINGS,
     ACTION_OTA,
     ACTION_FPGA,
+    ACTION_FPGA_DL,
     ACTION_RP2040_BL,
     ACTION_WIFI_CONNECT,
     ACTION_WIFI_SCAN,
@@ -139,6 +142,10 @@ void menu_launcher(xQueueHandle buttonQueue, pax_buf_t* pax_buffer, ILI9341* ili
     ota_args->action = ACTION_OTA;
     menu_insert_item(menu, "Firmware update", NULL, ota_args, -1);
     
+    menu_args_t* fpga_dl_args = malloc(sizeof(menu_args_t));
+    fpga_dl_args->action = ACTION_FPGA_DL;
+    menu_insert_item(menu, "FPGA download", NULL, fpga_dl_args, -1);
+
     menu_args_t* fpga_args = malloc(sizeof(menu_args_t));
     fpga_args->action = ACTION_FPGA;
     menu_insert_item(menu, "FPGA test", NULL, fpga_args, -1);
@@ -742,6 +749,8 @@ void app_main(void) {
         } else if (menu_action == ACTION_FPGA) {
             graphics_task(pax_buffer, ili9341, NULL, "Loading...");
             fpga_test(ili9341, ice40, rp2040->queue);
+        } else if (menu_action == ACTION_FPGA_DL) {
+            fpga_download(ice40, pax_buffer, ili9341);
         } else if (menu_action == ACTION_RP2040_BL) {
             graphics_task(pax_buffer, ili9341, NULL, "RP2040 update...");
             rp2040_reboot_to_bootloader(rp2040);