ESP32-C6 Peripheral Mapping
This document describes the mapping between ESP32-C6 (single-core RISC-V, Wi-Fi 6, Thread/Zigbee) on-chip peripherals and the TuyaOpen TKL layer software ports.
GPIO
- All GPIO pins support interrupts.
TUYA_GPIO_NUM_Eenum values map 1:1 to physical ESP32-C6 GPIO numbers.- 31 GPIOs in total (GPIO0 ~ GPIO30), no gaps.
| GPIO Range | TUYA_GPIO_NUM Range | Notes |
|---|---|---|
| GPIO0 ~ GPIO30 | TUYA_GPIO_NUM_0 ~ TUYA_GPIO_NUM_30 | General-purpose IO, all usable |
UART
- 2 UART ports supported.
- UART0 TX/RX pins are controlled by Kconfig options
UART_NUM0_TX_PIN/UART_NUM0_RX_PIN, defaulting to GPIO16 / GPIO17. - UART1 has no dedicated IO_MUX pins and routes through the GPIO Matrix. Default pins can be overridden before initialization via
tkl_io_pinmux_config().
Changing UART0 Pins
Run tos.py config menu in your project directory to enter the board configuration menu, find the relevant options and set the target GPIO numbers, or edit the default entries in boards/ESP32/ESP32-C6/Kconfig directly, then rebuild.
| Board Pin | Function | Software Pin | Software Port |
|---|---|---|---|
| GPIO16 (default) | UART0_TX | TUYA_GPIO_NUM_16 | TUYA_UART_NUM_0 |
| GPIO17 (default) | UART0_RX | TUYA_GPIO_NUM_17 | TUYA_UART_NUM_0 |
| GPIO6 (default) | UART1_TX | TUYA_GPIO_NUM_6 | TUYA_UART_NUM_1 |
| GPIO7 (default) | UART1_RX | TUYA_GPIO_NUM_7 | TUYA_UART_NUM_1 |
I2C
- 1 hardware I2C port supported (TUYA_I2C_NUM_0).
- Default pins can be overridden before initialization via
tkl_io_pinmux_config().
| Board Pin (default) | Function | Software Pin | Software Port |
|---|---|---|---|
| GPIO0 | I2C0_SCL | TUYA_IIC0_SCL | TUYA_I2C_NUM_0 |
| GPIO1 | I2C0_SDA | TUYA_IIC0_SDA | TUYA_I2C_NUM_0 |
PWM
- 6 PWM channels, implemented using ESP-IDF LEDC driver (LEDC_LOW_SPEED_MODE, 12-bit resolution).
- Default pins can be overridden before initialization via
tkl_io_pinmux_config(). - All default PWM pins (GPIO18–GPIO26) are within the C6 GPIO range (0–30).
| Board Pin (default) | Function | Software Pin | Software Port |
|---|---|---|---|
| GPIO18 | PWM0 | TUYA_PWM0 | TUYA_PWM_NUM_0 |
| GPIO19 | PWM1 | TUYA_PWM1 | TUYA_PWM_NUM_1 |
| GPIO22 | PWM2 | TUYA_PWM2 | TUYA_PWM_NUM_2 |
| GPIO23 | PWM3 | TUYA_PWM3 | TUYA_PWM_NUM_3 |
| GPIO25 | PWM4 | TUYA_PWM4 | TUYA_PWM_NUM_4 |
| GPIO26 | PWM5 | TUYA_PWM5 | TUYA_PWM_NUM_5 |
ADC
- ADC1 only (TUYA_ADC_NUM_0), 7 channels.
- Channels are configured via bitmask (
ch_list.data), where bit N enablesADC_CHANNEL_N. - Attenuation is fixed at
ADC_ATTEN_DB_12(~0–3.3 V range). Calibration uses the curve-fitting scheme.
| Board Pin | ADC Channel | Software Port |
|---|---|---|
| GPIO0 | ADC1_CH0 | TUYA_ADC_NUM_0 |
| GPIO1 | ADC1_CH1 | TUYA_ADC_NUM_0 |
| GPIO2 | ADC1_CH2 | TUYA_ADC_NUM_0 |
| GPIO3 | ADC1_CH3 | TUYA_ADC_NUM_0 |
| GPIO4 | ADC1_CH4 | TUYA_ADC_NUM_0 |
| GPIO5 | ADC1_CH5 | TUYA_ADC_NUM_0 |
| GPIO6 | ADC1_CH6 | TUYA_ADC_NUM_0 |