CI: enable example builds for C3

Enables building C3 examples in CI.

Fixes related warnings/errors and disables examples that cannot run.

examples/protocols/http_server/file_serving/main/main.c

@@ -37,20 +37,22 @@
 
 #define MOUNT_POINT "/sdcard"
 static const char *TAG="example";
-/* ESP32-S2 doesn't have an SD Host peripheral, always use SPI,
+/* ESP32-S2/C3 doesn't have an SD Host peripheral, always use SPI,
  * ESP32 can choose SPI or SDMMC Host, SPI is used by default: */
 
 #ifndef CONFIG_EXAMPLE_USE_SDMMC_HOST
 #define USE_SPI_MODE
 #endif
-// on ESP32-S2, DMA channel must be the same as host id
-#ifdef CONFIG_IDF_TARGET_ESP32S2
-#define SPI_DMA_CHAN    host.slot
-#endif //CONFIG_IDF_TARGET_ESP32S2
 // DMA channel to be used by the SPI peripheral
-#ifdef CONFIG_IDF_TARGET_ESP32
+#if CONFIG_IDF_TARGET_ESP32
 #define SPI_DMA_CHAN    1
-#endif //SPI_DMA_CHAN
+// on ESP32-S2, DMA channel must be the same as host id
+#elif CONFIG_IDF_TARGET_ESP32S2
+#define SPI_DMA_CHAN    host.slot
+#elif CONFIG_IDF_TARGET_ESP32C3
+// on ESP32-C3, DMA channels are shared with all other peripherals
+#define SPI_DMA_CHAN    1
+#endif //CONFIG_IDF_TARGET_ESP32
 
 // When testing SD and SPI modes, keep in mind that once the card has been
 // initialized in SPI mode, it can not be reinitialized in SD mode without
@@ -63,10 +65,17 @@ static char * mount_base_path = MOUNT_POINT;
 // Pin mapping when using SPI mode.
 // With this mapping, SD card can be used both in SPI and 1-line SD mode.
 // Note that a pull-up on CS line is required in SD mode.
+#if CONFIG_IDF_TARGET_ESP32C3
+#define PIN_NUM_MISO 2
+#define PIN_NUM_MOSI 7
+#define PIN_NUM_CLK  6
+#define PIN_NUM_CS   10
+#else
 #define PIN_NUM_MISO 2
 #define PIN_NUM_MOSI 15
 #define PIN_NUM_CLK  14
 #define PIN_NUM_CS   13
+#endif // CONFIG_IDF_TARGET_ESP32C3
 #endif //USE_SPI_MODE
 
 /* Function to initialize SPIFFS */
@@ -186,7 +195,6 @@ void sdcard_mount(void)
     sdmmc_card_print_info(stdout, card);
 
 }
-#endif
 
 static esp_err_t unmount_card(const char* base_path, sdmmc_card_t* card)
 {
@@ -205,6 +213,8 @@ static esp_err_t unmount_card(const char* base_path, sdmmc_card_t* card)
     return err;
 }
 
+#endif //CONFIG_EXAMPLE_MOUNT_SD_CARD
+
 void app_main(void)
 {
     /*Mount the SDcard first if needed.*/

examples/protocols/https_server/wss_server/main/keep_alive.c

@@ -13,6 +13,7 @@
 #include "freertos/queue.h"
 #include "freertos/task.h"
 #include "keep_alive.h"
+#include "esp_timer.h"
 
 typedef enum {
     NO_CLIENT = 0,

examples/protocols/pppos_client/components/modem/src/esp_modem.c

@@ -475,7 +475,11 @@ modem_dte_t *esp_modem_dte_init(const esp_modem_dte_config_t *config)
         .data_bits = config->data_bits,
         .parity = config->parity,
         .stop_bits = config->stop_bits,
+#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2
         .source_clk = UART_SCLK_REF_TICK,
+#else
+        .source_clk = UART_SCLK_XTAL,
+#endif
         .flow_ctrl = (config->flow_control == MODEM_FLOW_CONTROL_HW) ? UART_HW_FLOWCTRL_CTS_RTS : UART_HW_FLOWCTRL_DISABLE
     };
     MODEM_CHECK(uart_param_config(esp_dte->uart_port, &uart_config) == ESP_OK, "config uart parameter failed", err_uart_config);

examples/protocols/sockets/tcp_server/main/tcp_server.c

@@ -112,7 +112,7 @@ static void tcp_server_task(void *pvParameters)
         ESP_LOGI(TAG, "Socket listening");
 
         struct sockaddr_storage source_addr; // Large enough for both IPv4 or IPv6
-        uint addr_len = sizeof(source_addr);
+        socklen_t addr_len = sizeof(source_addr);
         int sock = accept(listen_sock, (struct sockaddr *)&source_addr, &addr_len);
         if (sock < 0) {
             ESP_LOGE(TAG, "Unable to accept connection: errno %d", errno);