Yep, it's very confusing (I would say misleading), those pins definitions are used only in Arduino with their board, but are not the standard designation from RP2040 datasheet followed by SDK, MicroPython, even Arduino in other context:
This is from SDK if you choose this board:Please note it's missing SPI CS definition which should be like this:
This is from SDK if you choose this board:
Code:
/* * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */// -----------------------------------------------------// NOTE: THIS HEADER IS ALSO INCLUDED BY ASSEMBLER SO// SHOULD ONLY CONSIST OF PREPROCESSOR DIRECTIVES// -----------------------------------------------------// pico_cmake_set PICO_PLATFORM=rp2040#ifndef _BOARDS_SEEED_XIAO_RP2040_H#define _BOARDS_SEEED_XIAO_RP2040_H// For board detection#define SEEED_XIAO_RP2040// On some samples, the xosc can take longer to stabilize than is usual#ifndef PICO_XOSC_STARTUP_DELAY_MULTIPLIER#define PICO_XOSC_STARTUP_DELAY_MULTIPLIER 64#endif//------------- UART -------------//#ifndef PICO_DEFAULT_UART#define PICO_DEFAULT_UART 0#endif#ifndef PICO_DEFAULT_UART_TX_PIN#define PICO_DEFAULT_UART_TX_PIN 0#endif#ifndef PICO_DEFAULT_UART_RX_PIN#define PICO_DEFAULT_UART_RX_PIN 1#endif//------------- LED -------------//#ifndef PICO_DEFAULT_LED_PIN#define PICO_DEFAULT_LED_PIN 25#endif#ifndef PICO_DEFAULT_LED_PIN_INVERTED#define PICO_DEFAULT_LED_PIN_INVERTED 1#endif#ifndef PICO_DEFAULT_WS2812_PIN#define PICO_DEFAULT_WS2812_PIN 12#endif#ifndef PICO_DEFAULT_WS2812_POWER_PIN#define PICO_DEFAULT_WS2812_POWER_PIN 11#endif//------------- I2C -------------//#ifndef PICO_DEFAULT_I2C#define PICO_DEFAULT_I2C 1#endif#ifndef PICO_DEFAULT_I2C_SDA_PIN#define PICO_DEFAULT_I2C_SDA_PIN 6#endif#ifndef PICO_DEFAULT_I2C_SCL_PIN#define PICO_DEFAULT_I2C_SCL_PIN 7#endif//------------- SPI -------------//#ifndef PICO_DEFAULT_SPI#define PICO_DEFAULT_SPI 0#endif#ifndef PICO_DEFAULT_SPI_TX_PIN#define PICO_DEFAULT_SPI_TX_PIN 3#endif#ifndef PICO_DEFAULT_SPI_RX_PIN#define PICO_DEFAULT_SPI_RX_PIN 4#endif#ifndef PICO_DEFAULT_SPI_SCK_PIN#define PICO_DEFAULT_SPI_SCK_PIN 2#endif//------------- FLASH -------------//#define PICO_BOOT_STAGE2_CHOOSE_W25Q080 1#ifndef PICO_FLASH_SPI_CLKDIV#define PICO_FLASH_SPI_CLKDIV 2#endif// pico_cmake_set_default PICO_FLASH_SIZE_BYTES = (2 * 1024 * 1024)#ifndef PICO_FLASH_SIZE_BYTES#define PICO_FLASH_SIZE_BYTES (2 * 1024 * 1024)#endif// All boards have B1 RP2040#ifndef PICO_RP2040_B0_SUPPORTED#define PICO_RP2040_B0_SUPPORTED 0#endif#endif
Code:
#ifndef PICO_DEFAULT_SPI_CSN_PIN#define PICO_DEFAULT_SPI_CSN_PIN 1#endif
Statistics: Posted by gmx — Tue Apr 22, 2025 11:28 am