Running SnapClient on ESP32-C6 SuperMini

[KoStard]

I got snapclient running on ESP32-C6 SuperMini, so wanted to share here, in case it would benefit someone else.

Setup

Hardware I used:

• TENSTAR ROBOT ESP32-C6 SuperMini - https://fr.aliexpress.com/item/1005007592520291.html
• MAX98357A DAC
• Speaker from a TV
• External 5V power source

ESP-IDF v5.5.1

Getting it compiled

ESP32-C6 has only one core, and only one I2S peripheral, so the snapclient code wouldn't compile in ESP-IDF.

32-bit RISC-V single-core processor
https://docs.espressif.com/projects/esp-idf/en/stable/esp32c6/get-started/index.html

ESP32-C6 contains one I2S peripheral(s).
https://docs.espressif.com/projects/esp-idf/en/stable/esp32c6/api-reference/peripherals/i2s.html

So I ended up making these changes:

diff --git a/components/custom_board/generic_board/board_pins_config.c b/components/custom_board/generic_board/board_pins_config.c
index 209e0b3..965972e 100644
--- a/components/custom_board/generic_board/board_pins_config.c
+++ b/components/custom_board/generic_board/board_pins_config.c
@@ -40,7 +40,7 @@ static const char *TAG = "GENERIC_BOARD";
 
 esp_err_t get_i2c_pins(i2c_port_t port, i2c_config_t *i2c_config) {
   AUDIO_NULL_CHECK(TAG, i2c_config, return ESP_FAIL);
-  if (port == I2C_NUM_0 || port == I2C_NUM_1) {
+  if (port == I2C_NUM_0) {
     i2c_config->sda_io_num = CONFIG_DAC_I2C_SDA;
     i2c_config->scl_io_num = CONFIG_DAC_I2C_SCL;
   } else {
@@ -89,7 +89,7 @@ esp_err_t get_spi_pins(
 
 // sdcard
 
-int8_t get_sdcard_intr_gpio(void) { return SDCARD_INTR_GPIO; }
+int8_t get_sdcard_intr_gpio(void) { return -1; }
 
 int8_t get_sdcard_open_file_num_max(void) { return SDCARD_OPEN_FILE_NUM_MAX; }
 
diff --git a/components/lightsnapcast/player.c b/components/lightsnapcast/player.c
index 8ddf962..fc7f249 100644
--- a/components/lightsnapcast/player.c
+++ b/components/lightsnapcast/player.c
@@ -32,7 +32,7 @@
 #define USE_SAMPLE_INSERTION CONFIG_USE_SAMPLE_INSERTION
 
 #define SYNC_TASK_PRIORITY (configMAX_PRIORITIES - 1)
-#define SYNC_TASK_CORE_ID 1  // tskNO_AFFINITY
+#define SYNC_TASK_CORE_ID 0  // tskNO_AFFINITY
 
 static const char *TAG = "PLAYER";

SDCARD_INTR_GPIO is defined as GPIO_NUM_34, which the SuperMini didn't have, so had to change.

This is my sdkconfig.defaults.esp32c6

# This file was generated using idf.py save-defconfig. It can be edited manually.
# Espressif IoT Development Framework (ESP-IDF) 5.5.1 Project Minimal Configuration
#
CONFIG_IDF_TARGET="esp32c6"
CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
CONFIG_PARTITION_TABLE_CUSTOM=y
CONFIG_SNAPSERVER_HOST="192.168.178.115"
CONFIG_SNAPCLIENT_NAME="ESP32Speaker"
CONFIG_USE_SAMPLE_INSERTION=y
CONFIG_AUDIO_BOARD_CUSTOM=y
CONFIG_DAC_MAX98357=y
CONFIG_DAC_I2C_SDA=-1
CONFIG_DAC_I2C_SCL=-1
CONFIG_MASTER_I2S_MCLK_PIN=-1
CONFIG_MASTER_I2S_BCK_PIN=14
CONFIG_MASTER_I2S_LRCK_PIN=20
CONFIG_MASTER_I2S_DATAOUT_PIN=2
CONFIG_MAX98357_MUTE_PIN=-1
CONFIG_WIFI_SSID="XXX"
CONFIG_WIFI_PASSWORD="XXX"
CONFIG_WIFI_MAXIMUM_RETRY=50

Note: CONFIG_SNAPCLIENT_NAME is part of sdkconfig, so when assembling multiple devices, they will end up having the same name unless you change CONFIG_SNAPCLIENT_NAME each time and recompile. I wonder if easier approach exists.

Note: I still get wifi reliability issues, but this is not related to this board, for now the wifi needs to be pretty good.