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mirror of https://github.com/RIOT-OS/RIOT.git synced 2024-12-29 04:50:03 +01:00

cpu/esp32: add ESP32-S2 specific configuration header files

This commit is contained in:
Gunar Schorcht 2022-08-19 00:45:24 +02:00
parent 67183a196d
commit dac197031e
7 changed files with 437 additions and 2 deletions

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@ -65,6 +65,8 @@
#include "cpu_conf_esp32.h"
#elif defined(CPU_FAM_ESP32C3)
#include "cpu_conf_esp32c3.h"
#elif defined(CPU_FAM_ESP32S2)
#include "cpu_conf_esp32s2.h"
#elif defined(CPU_FAM_ESP32S3)
#include "cpu_conf_esp32s3.h"
#else

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@ -0,0 +1,41 @@
/*
* Copyright (C) 2022 Gunar Schorcht
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cpu_esp32
* @ingroup config
* @brief Compile-time configuration macros for ESP32-S2 SoCs
* @{
*
* @file
* @brief ESP32-S2 specific compile-time configuration
*
* @author Gunar Schorcht <gunar@schorcht.net>
*/
#ifndef CPU_CONF_ESP32S2_H
#define CPU_CONF_ESP32S2_H
#ifndef ESP_ISR_STACKSIZE
/** Stack size used in interrupt context */
#define ESP_ISR_STACKSIZE (THREAD_STACKSIZE_DEFAULT)
#endif /* ESP_ISR_STACKSIZE */
/** Number of DRAM sections that can be used as heap. */
#define NUM_HEAPS (1)
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
}
#endif
#endif /* CPU_CONF_ESP32S2_H */
/** @} */

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@ -561,7 +561,7 @@ typedef struct {
* That is, if SPI_DEV(1) is used by defining the `SPI1_*` symbols,
* SPI_DEV(0) must also be used by defining the `SPI0_*` symbols.
* - The order in which the available interfaces `SPI2_HOST` (alias `HSPI` or
* `FSP`) and `SPI3_HOST` (alias `HSPI`) are assigned doesn't matter.
* `FSPI`) and `SPI3_HOST` (alias `VPSI` or `HSPI`) are assigned doesn't matter.
* - The GPIOs listed in the configuration are only initialized as SPI
* signals when the `periph_spi` module is used. Otherwise they are not
* allocated and can be used for other purposes.
@ -599,9 +599,15 @@ typedef spi_host_device_t spi_ctrl_t;
* sheets. These alias names have been declared obsolete in ESP-IDF. For
* source code compatibility reasons these alias names are defined here.
*/
#if defined(CPU_FAM_ESP32)
#define HSPI SPI2_HOST /**< Alias name for SPI2_HOST as used in former ESP-IDF versions */
#define FSPI SPI2_HOST /**< Alias name for SPI2_HOST as used in former ESP-IDF versions */
#define VSPI SPI3_HOST /**< Alias name for SPI3_HOST as used in former ESP-IDF versions */
#elif defined(CPU_FAM_ESP32S2)
#define FSPI SPI2_HOST /**< Alias name for SPI2_HOST as used in former ESP-IDF versions */
#define HSPI SPI3_HOST /**< Alias name for SPI3_HOST as used in former ESP-IDF versions */
#else
#define FSPI SPI2_HOST /**< Alias name for SPI2_HOST as used in former ESP-IDF versions */
#endif
/**
* @brief SPI configuration structure type
@ -741,6 +747,8 @@ typedef struct {
#include "periph_cpu_esp32.h"
#elif defined(CPU_FAM_ESP32C3)
#include "periph_cpu_esp32c3.h"
#elif defined(CPU_FAM_ESP32S2)
#include "periph_cpu_esp32s2.h"
#elif defined(CPU_FAM_ESP32S3)
#include "periph_cpu_esp32s3.h"
#else

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@ -0,0 +1,227 @@
/*
* Copyright (C) 2022 Gunar Schorcht
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cpu_esp32
* @{
*
* @file
* @brief ESP32-S2 specific peripheral configuration
*
* @author Gunar Schorcht <gunar@schorcht.net>
*/
#ifndef PERIPH_CPU_ESP32S2_H
#define PERIPH_CPU_ESP32S2_H
#include "sdkconfig.h"
#ifdef __cplusplus
extern "C" {
#endif
/** Mapping configured ESP32-S2 default clock to CLOCK_CORECLOCK define */
#define CLOCK_CORECLOCK (1000000UL * CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ)
/**
* @name Predefined GPIO names
* @{
*/
#define GPIO0 (GPIO_PIN(PORT_GPIO, 0))
#define GPIO1 (GPIO_PIN(PORT_GPIO, 1))
#define GPIO2 (GPIO_PIN(PORT_GPIO, 2))
#define GPIO3 (GPIO_PIN(PORT_GPIO, 3))
#define GPIO4 (GPIO_PIN(PORT_GPIO, 4))
#define GPIO5 (GPIO_PIN(PORT_GPIO, 5))
#define GPIO6 (GPIO_PIN(PORT_GPIO, 6))
#define GPIO7 (GPIO_PIN(PORT_GPIO, 7))
#define GPIO8 (GPIO_PIN(PORT_GPIO, 8))
#define GPIO9 (GPIO_PIN(PORT_GPIO, 9))
#define GPIO10 (GPIO_PIN(PORT_GPIO, 10))
#define GPIO11 (GPIO_PIN(PORT_GPIO, 11))
#define GPIO12 (GPIO_PIN(PORT_GPIO, 12))
#define GPIO13 (GPIO_PIN(PORT_GPIO, 13))
#define GPIO14 (GPIO_PIN(PORT_GPIO, 14))
#define GPIO15 (GPIO_PIN(PORT_GPIO, 15))
#define GPIO16 (GPIO_PIN(PORT_GPIO, 16))
#define GPIO17 (GPIO_PIN(PORT_GPIO, 17))
#define GPIO18 (GPIO_PIN(PORT_GPIO, 18))
#define GPIO19 (GPIO_PIN(PORT_GPIO, 19))
#define GPIO20 (GPIO_PIN(PORT_GPIO, 20))
#define GPIO21 (GPIO_PIN(PORT_GPIO, 21))
/* GPIOs 22 ...25 are not available */
#define GPIO26 (GPIO_PIN(PORT_GPIO, 26))
#define GPIO27 (GPIO_PIN(PORT_GPIO, 27))
#define GPIO28 (GPIO_PIN(PORT_GPIO, 28))
#define GPIO29 (GPIO_PIN(PORT_GPIO, 29))
#define GPIO30 (GPIO_PIN(PORT_GPIO, 30))
#define GPIO31 (GPIO_PIN(PORT_GPIO, 31))
#define GPIO32 (GPIO_PIN(PORT_GPIO, 32))
#define GPIO33 (GPIO_PIN(PORT_GPIO, 33))
#define GPIO34 (GPIO_PIN(PORT_GPIO, 34))
#define GPIO35 (GPIO_PIN(PORT_GPIO, 35))
#define GPIO36 (GPIO_PIN(PORT_GPIO, 36))
#define GPIO37 (GPIO_PIN(PORT_GPIO, 37))
#define GPIO38 (GPIO_PIN(PORT_GPIO, 38))
#define GPIO39 (GPIO_PIN(PORT_GPIO, 39))
#define GPIO40 (GPIO_PIN(PORT_GPIO, 40))
#define GPIO41 (GPIO_PIN(PORT_GPIO, 41))
#define GPIO42 (GPIO_PIN(PORT_GPIO, 42))
#define GPIO43 (GPIO_PIN(PORT_GPIO, 43))
#define GPIO44 (GPIO_PIN(PORT_GPIO, 44))
#define GPIO45 (GPIO_PIN(PORT_GPIO, 45))
#define GPIO46 (GPIO_PIN(PORT_GPIO, 46))
/** @} */
/**
* @name ADC configuration
*
* ESP32-S2 integrates two 13-bit ADCs (ADC1 and ADC2) with 20 channels in
* total:
*
* - **ADC1** supports 10 channels: GPIO1 ... GPIO10
* - **ADC2** supports 10 channels: GPIO11 ... GPIO20
*
* @note
* - ADC2 is also used by the WiFi module. The GPIOs connected to ADC2 are
* therefore not available as ADC channels if the modules `esp_wifi` or
* `esp_now` are used.
* - Vref can be read with function #adc_line_vref_to_gpio at an ADC2 channel,
* that is at GPIO11 ... GPIO20.
* - GPIO3 is a strapping pin und shouldn't be used as ADC channel
*/
/**
* @name I2C configuration
*
* ESP32-S2 has two built-in I2C interfaces.
*
* The following table shows the default configuration of I2C interfaces
* used for ESP32-S2 boards. It can be overridden by
* [application-specific configurations](#esp32_application_specific_configurations).
*
* <center>
*
* Device | Signal | Pin | Symbol | Remarks
* :----------|:-------|:-------|:--------------|:----------------
* I2C_DEV(0) | | | `#I2C0_SPEED` | default is `I2C_SPEED_FAST`
* I2C_DEV(0) | SCL | GPIO9 | `#I2C0_SCL` | -
* I2C_DEV(0) | SDA | GPIO8 | `#I2C0_SDA` | -
*
* </center><br>
*/
/**
* @name PWM configuration
*
* The ESP32-S2 LEDC module has 1 channel group with 8 channels. Each of
* these channels can be clocked by one of the 4 timers.
*/
/**
* @name SPI configuration
*
* ESP32-S2 has four SPI controllers where SPI0 and SPI1 share the same bus
* and can only operate in memory mode while SPI2 and SPI3 can be used as general
* purpose SPI:
*
* - controller SPI0 is reserved for external memories like Flash and PSRAM
* - controller SPI1 is reserved for external memories like Flash and PSRAM
* - controller SPI2 can be used for peripherals (also called FSPI)
* - controller SPI3 can be used for peripherals
*
* Thus, SPI2 (`FSPI`) and SPI3 can be used as general purpose SPI in
* RIOT as SPI_DEV(0) and SPI_DEV(1) by defining the symbols `SPI0_*`
* and `SPI1_*`.
*
* The following table shows the pin configuration used by default, even
* though it **can vary** from board to board.
*
* <center>
*
* Device (Alias) | Signal | Pin | Symbol | Remarks
* :-----------------------|:------:|:-------|:-----------:|:---------------------------
* `SPI_HOST0`/`SPI_HOST1` | SPICS0 | GPIO29 | - | reserved for Flash and PSRAM
* `SPI_HOST0`/`SPI_HOST1` | SPICS1 | GPIO26 | - | reserved for Flash and PSRAM
* `SPI_HOST0`/`SPI_HOST1` | SPICLK | GPIO30 | - | reserved for Flash and PSRAM
* `SPI_HOST0`/`SPI_HOST1` | SPID | GPIO32 | - | reserved for Flash and PSRAM
* `SPI_HOST0`/`SPI_HOST1` | SPIQ | GPIO31 | - | reserved for Flash and PSRAM
* `SPI_HOST0`/`SPI_HOST1` | SPIHD | GPIO27 | - | reserved for Flash and PSRAM (only in `qio` or `qout` mode)
* `SPI_HOST0`/`SPI_HOST1` | SPIWP | GPIO28 | - | reserved for Flash and PSRAM (only in `qio` or `qout` mode)
* `SPI_HOST0`/`SPI_HOST1` | SPIIO4 | GPIO33 | - | reserved for Flash and PSRAM (only in octal mode)
* `SPI_HOST0`/`SPI_HOST1` | SPIIO5 | GPIO34 | - | reserved for Flash and PSRAM (only in octal mode)
* `SPI_HOST0`/`SPI_HOST1` | SPIIO6 | GPIO35 | - | reserved for Flash and PSRAM (only in octal mode)
* `SPI_HOST0`/`SPI_HOST1` | SPIIO7 | GPIO36 | - | reserved for Flash and PSRAM (only in octal mode)
* `SPI_HOST0`/`SPI_HOST1` | SPIDQA | GPIO37 | - | reserved for Flash and PSRAM (only in octal mode)
* `SPI_HOST2` (`FSPI`) | SCK | GPIO36 |`#SPI0_SCK` | can be used
* `SPI_HOST2` (`FSPI`) | MOSI | GPIO35 |`#SPI0_MOSI` | can be used
* `SPI_HOST2` (`FSPI`) | MISO | GPIO37 |`#SPI0_MISO` | can be used
* `SPI_HOST2` (`FSPI`) | CS0 | GPIO38 |`#SPI0_CS0` | can be used
* `SPI_HOST3` (`HSPI`) | SCK | - |`#SPI1_SCK` | can be used
* `SPI_HOST3` (`HSPI`) | MOSI | - |`#SPI1_MOSI` | can be used
* `SPI_HOST3` (`HSPI`) | MISO | - |`#SPI1_MISO` | can be used
* `SPI_HOST3` (`HSPI`) | CS0 | - |`#SPI1_CS0` | can be used
*
* </center><br>
*/
/**
* @name Timer configuration depending on which implementation is used
*
* Timers are MCU built-in feature and not board-specific. They are therefore
* configured here.
*
* ESP32-S2 has two timer groups with two timers each, resulting in a total of
* four timers. Since one timer is used as system timer, up to three timers
* with one channel each can be used in RIOT as timer devices
* TIMER_DEV(0) ... TIMER_DEV(2).
*
* Additionally ESP32-S2 has three CCOMPARE registers which can be used
* alternatively as timer devices TIMER_DEV(0) ... TIMER_DEV(2) can be used
* in RIOT if the module `esp_hw_counter` is enabled.
*/
#ifdef MODULE_ESP_HW_COUNTER
/** Hardware ccount/ccompare registers are used for timer implementation */
#define TIMER_NUMOF (2)
#define TIMER_CHANNEL_NUMOF (1)
#endif
/**
* @name UART configuration
*
* ESP32-S2 integrates two UART interfaces. The following default pin
* configuration of UART interfaces as used by a most boards can be overridden
* by the application, see section [Application-Specific Configurations]
* (#esp32_application_specific_configurations).
*
* <center>
*
* Device |Signal|Pin |Symbol |Remarks
* :-----------|:-----|:-------|:-----------|:----------------
* UART_DEV(0) | TxD | GPIO43 |`#UART0_TXD`| cannot be changed
* UART_DEV(0) | RxD | GPIO44 |`#UART0_RXD`| cannot be changed
* UART_DEV(1) | TxD | GPIO17 |`#UART1_TXD`| optional, can be overridden
* UART_DEV(1) | RxD | GPIO18 |`#UART1_RXD`| optional, can be overridden
* UART_DEV(2) | TxD | - |`UART2_TXD` | optional, can be overridden (no direct I/O)
* UART_DEV(2) | RxD | - |`UART2_RXD` | optional, can be overridden (no direct I/O)
*
* </center><br>
*
*/
#ifdef MODULE_PERIPH_CAN
#include "can_esp.h"
#endif
#ifdef __cplusplus
}
#endif
#endif /* PERIPH_CPU_ESP32S2_H */
/** @} */

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@ -83,6 +83,7 @@
#define CONFIG_ESP_SYSTEM_CHECK_INT_LEVEL_4 1
#define CONFIG_ESP_SYSTEM_EVENT_QUEUE_SIZE 32
#define CONFIG_ESP_SYSTEM_EVENT_TASK_STACK_SIZE 2560
#define CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE 1
#define CONFIG_ESP_TIME_FUNCS_USE_ESP_TIMER 1
#define CONFIG_ESP_TIMER_TASK_STACK_SIZE 3584
@ -139,6 +140,9 @@
#define CONFIG_SPI_FLASH_SUPPORT_MXIC_CHIP 1
#define CONFIG_SPI_FLASH_SUPPORT_GD_CHIP 1
#define CONFIG_SPI_FLASH_SUPPORT_WINBOND_CHIP 1
#define CONFIG_SPI_FLASH_SUPPORT_BOYA_CHIP 1
#define CONFIG_SPI_FLASH_SUPPORT_TH_CHIP 1
#define CONFIG_SPI_FLASH_SUPPORT_MXIC_OPI_CHIP 1
/**
* Ethernet driver configuration (DO NOT CHANGE)
@ -211,6 +215,8 @@
#include "sdkconfig_esp32.h"
#elif defined(CPU_FAM_ESP32C3)
#include "sdkconfig_esp32c3.h"
#elif defined(CPU_FAM_ESP32S2)
#include "sdkconfig_esp32s2.h"
#elif defined(CPU_FAM_ESP32S3)
#include "sdkconfig_esp32s3.h"
#else

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@ -0,0 +1,150 @@
/*
* Copyright (C) 2022 Gunar Schorcht
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cpu_esp32
* @{
*
* @file
* @brief SDK configuration used by the ESP-IDF for ESP32-S2 SoC variant (family)
*
* The SDK configuration can be partially overridden by application-specific
* board configuration.
*
* @author Gunar Schorcht <gunar@schorcht.net>
*/
#ifndef SDKCONFIG_ESP32S2_H
#define SDKCONFIG_ESP32S2_H
#ifndef DOXYGEN
#ifdef __cplusplus
extern "C" {
#endif
/**
* @name ESP32-S2 specific clock configuration
* @{
*/
/* Mapping of Kconfig defines to the respective enumeration values */
#if CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ_2
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 2
#elif CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ_5
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 5
#elif CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ_10
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 10
#elif CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ_20
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 20
#elif CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ_40
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 40
#elif CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ_80
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 80
#elif CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ_160
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 160
#elif CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ_240
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 240
#endif
/**
* @brief Defines the CPU frequency [values = 2, 5, 10, 10, 40, 80, 160, 240]
*/
#ifndef CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ
#define CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ 80
#endif
/** @} */
/**
* ESP32-S2 specific RTC clock configuration
*/
#define CONFIG_ESP32S2_RTC_CLK_CAL_CYCLES (8 * 1024)
/**
* ESP32-S2 specific EFUSE configuration
*/
#define CONFIG_EFUSE_MAX_BLK_LEN 256
/**
* ESP32-S2 specific MAC configuration
*/
#define CONFIG_ESP_MAC_ADDR_UNIVERSE_WIFI_STA 1
#define CONFIG_ESP_MAC_ADDR_UNIVERSE_WIFI_AP 1
#define CONFIG_ESP32S2_UNIVERSAL_MAC_ADDRESSES 2
/**
* ESP32-S2 specific serial flasher config (DO NOT CHANGE)
*/
#define CONFIG_ESPTOOLPY_FLASHFREQ_80M 1
#define CONFIG_ESPTOOLPY_FLASHFREQ "80m"
/**
* ESP32-S2 specific system configuration (DO NOT CHANGE)
*/
#define CONFIG_ESP_TIMER_IMPL_SYSTIMER 1
#define CONFIG_ESP_CONSOLE_MULTIPLE_UART 1
#define CONFIG_ESP32S2_DEBUG_OCDAWARE 1
#define CONFIG_ESP32S2_BROWNOUT_DET 1
#define CONFIG_ESP32S2_BROWNOUT_DET_LVL 7
#define CONFIG_ESP32S2_TRACEMEM_RESERVE_DRAM 0x0
#define CONFIG_ESP32S2_ULP_COPROC_RESERVE_MEM 0
/**
* ESP32-S2 specific sleep configuration (DO NOT CHANGE)
*/
#define CONFIG_ESP_SLEEP_RTC_BUS_ISO_WORKAROUND 1
/**
* ESP32-S2 specific PHY configuration
*/
#define CONFIG_USB_OTG_SUPPORTED 0
#define CONFIG_USB_HOST_CONTROL_TRANSFER_MAX_SIZE 256
#define CONFIG_USB_HOST_HW_BUFFER_BIAS_BALANCED 1
/**
* ESP32-S2 specific SPI RAM configuration
*/
#ifdef MODULE_ESP_SPI_RAM
#define CONFIG_ESP32S2_SPIRAM_SUPPORT 1
#ifdef MODULE_ESP_SPI_OCT
#define CONFIG_SPIRAM_MODE_OCT 1
#else
#define CONFIG_SPIRAM_MODE_QUAD 1
#endif
#define CONFIG_DEFAULT_PSRAM_CLK_IO 30
#define CONFIG_DEFAULT_PSRAM_CS_IO 26
#define CONFIG_SPIRAM_SUPPORT CONFIG_ESP32S2_SPIRAM_SUPPORT
#endif
/**
* ESP32-S2 specific Cache config
*/
#define CONFIG_ESP32S2_INSTRUCTION_CACHE_8KB 1
#define CONFIG_ESP32S2_INSTRUCTION_CACHE_LINE_32B 1
#define CONFIG_ESP32S2_DATA_CACHE_8KB 1
#define CONFIG_ESP32S2_DATA_CACHE_LINE_32B 1
/**
* ESP32-S2 specific system configuration
*/
#define CONFIG_ESP_SYSTEM_MEMPROT_DEPCHECK 1
#define CONFIG_ESP_SYSTEM_MEMPROT_FEATURE 0 /* default enabled */
#define CONFIG_ESP_SYSTEM_MEMPROT_FEATURE_LOCK 0 /* default enabled */
#define CONFIG_ESP_SYSTEM_MEMPROT_CPU_PREFETCH_PAD_SIZE 16
#define CONFIG_ESP_SYSTEM_MEMPROT_MEM_ALIGN_SIZE 4
#ifdef __cplusplus
}
#endif
#endif /* DOXYGEN */
#endif /* SDKCONFIG_ESP32S2_H */
/** @} */

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@ -13133,6 +13133,7 @@ boards/common/esp32c3/include/board_common.h:[0-9]+: warning: Member SPIFFS_[_A-
cpu/esp32/include/periph_cpu_esp32s3\.h:[0-9]+: warning: Member GPIO[0-9]+ \(macro definition\) of file periph_cpu_esp32s3\.h is not documented.
boards/common/esp32s3/include/board_common.h:[0-9]+: warning: Member LED[0-9]_[A-Z]+ \(macro definition\) of file board_common\.h is not documented.
boards/common/esp32s3/include/board_common.h:[0-9]+: warning: Member SPIFFS_[_A-Z]+ \(macro definition\) of file board_common\.h is not documented.
cpu/esp32/include/periph_cpu_esp32s2\.h:[0-9]+: warning: Member GPIO[0-9]+ \(macro definition\) of file periph_cpu_esp32s2\.h is not documented.
boards/waveshare\-nrf52840\-eval\-kit/include/arduino_pinmap\.h:[0-9]+: warning: Member ARDUINO_PIN_[A0-9]+ \(macro definition\) of file arduino_pinmap\.h is not documented.
boards/waveshare\-nrf52840\-eval\-kit/include/arduino_pinmap\.h:[0-9]+: warning: Member ARDUINO_[A0-9]+ \(macro definition\) of file arduino_pinmap\.h is not documented.
boards/waveshare\-nrf52840\-eval\-kit/include/board\.h:[0-9]+: warning: Member LED[A-Z0-9_]+ \(macro definition\) of file board\.h is not documented.