/* * Copyright (C) 2018 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 CPU specific definitions and functions for peripheral handling * * @author Gunar Schorcht */ #ifndef PERIPH_CPU_H #define PERIPH_CPU_H #include #ifdef __cplusplus extern "C" { #endif /** * @name Power management configuration * @{ */ #define PROVIDES_PM_SET_LOWEST #define PROVIDES_PM_RESTART #define PROVIDES_PM_OFF /** @} */ /** * @brief Length of the CPU_ID in octets */ #define CPUID_LEN (7U) /** * @brief Available ports on the ESP32 * @{ */ #define PORT_GPIO 0 /**< port GPIO */ /** @} */ /** * @brief Definition of a fitting UNDEF value */ #define GPIO_UNDEF (0xff) /** * @brief Define CPU specific GPIO pin generator macro */ #define GPIO_PIN(x, y) ((x << 4) | y) /** * @brief Define CPU specific number of GPIO pins * @{ */ #define GPIO_PIN_NUMOF 40 #ifndef GPIO_PIN_COUNT #define GPIO_PIN_COUNT GPIO_PIN_NUMOF #endif /** @} */ /** * @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)) /* GPIO 20 is not available */ #define GPIO21 (GPIO_PIN(PORT_GPIO,21)) #define GPIO22 (GPIO_PIN(PORT_GPIO,22)) #define GPIO23 (GPIO_PIN(PORT_GPIO,23)) /* GPIO 24 is not available */ #define GPIO25 (GPIO_PIN(PORT_GPIO,25)) #define GPIO26 (GPIO_PIN(PORT_GPIO,26)) #define GPIO27 (GPIO_PIN(PORT_GPIO,27)) /* GPIOs 28 ...32 are not available */ #define GPIO32 (GPIO_PIN(PORT_GPIO,32)) #define GPIO33 (GPIO_PIN(PORT_GPIO,33)) /* GPIOs 34 ... 39 can only be used as inputs and do not have pullups/pulldowns */ #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)) /** @} */ /** * @brief Override mode flank selection values * * @{ */ #define HAVE_GPIO_FLANK_T typedef enum { GPIO_NONE = 0, GPIO_RISING = 1, /**< emit interrupt on rising flank */ GPIO_FALLING = 2, /**< emit interrupt on falling flank */ GPIO_BOTH = 3, /**< emit interrupt on both flanks */ GPIO_LOW = 4, /**< emit interrupt on low level */ GPIO_HIGH = 5 /**< emit interrupt on low level */ } gpio_flank_t; /** @} */ /** * @brief Override GPIO modes * * @{ */ #define HAVE_GPIO_MODE_T typedef enum { GPIO_IN, /**< input */ GPIO_IN_PD, /**< input with pull-down */ GPIO_IN_PU, /**< input with pull-up */ GPIO_OUT, /**< output */ GPIO_OD, /**< open-drain output */ GPIO_OD_PU, /**< open-drain output with pull-up */ GPIO_IN_OUT, /**< input and output */ GPIO_IN_OD, /**< input and open-drain output */ GPIO_IN_OD_PU /**< input and open-drain output */ } gpio_mode_t; /** @} */ /** * @name ADC configuration * * ESP32 integrates two 12-bit ADCs (ADC1 and ADC2) capable of measuring up to * 18 analog signals in total. Most of these ADC channels are either connected * to a number of intergrated sensors like a Hall sensors, touch sensors and a * temperature sensor or can be connected with certain GPIOs. Integrated * sensors are disabled in RIOT's implementation and are not accessible. Thus, * up to 18 GPIOs, the RTC GPIOs, can be used as ADC inputs: * * - ADC1 supports 8 channels: GPIO 32-39 * - ADC2 supports 10 channels: GPIO 0, 2, 4, 12-15, 25-27 * * For each ADC line, an attenuation of the input signal can be defined * separately unsing function *adc_set_attenuation*, see file * ```$RIOTBASE/cpu/esp32/include/adc_arch.h```. * This results in different full ranges of the measurable voltage * at the input. The attenuation can be set to 0 dB, 3 dB, 6 dB and 11 dB, * with 11 dB being the standard attenuation. Since an ADC input is measured * against a reference voltage Vref of 1.1 V, approximately the following * measurement ranges are given when using a corresponding attenuation: * *
* * Attenuation | Voltage Range | Symbol * ----------------|-------------------|---------------------- * 0 dB | 0 ... 1.1V (Vref) | ADC_ATTENUATION_0_DB * 3 dB | 0 ... 1.5V | ADC_ATTENUATION_3_DB * 6 dB | 0 ... 2.2V | ADC_ATTENUATION_6_DB * 11 dB (default) | 0 ... 3.3V | ADC_ATTENUATION_11_DB * *
* * Please note: The reference voltage Vref can vary from device to device in * the range of 1.0V and 1.2V. The Vref of a device can be read with the * function *adc_vref_to_gpio25* at the pin GPIO 25, see file * ```$RIOTBASE/cpu/esp32/include/adc_arch.h```. The results of the ADC * input can then be adjusted accordingly. * * ADC_GPIOS in the board-specific peripheral configuration defines a list of * GPIOs that can be used as ADC channels. The order of the listed GPIOs * determines the mapping between the RIOT's ADC lines and the GPIOs. * * @note ADC_GPIOS must be defined even if there are no GPIOs that could be * used as ADC channels on the board. In this case, an empy list hast to be * defined which just contains the curly braces. * * ADC_NUMOF is determined automatically from the ADC_GPIOS definition. * * @note As long as the GPIOs listed in ADC_GPIOS are not initialized * as ADC channels with the *adc_init* function, they can be used for other * purposes. * * @{ */ /** * @brief Possible ADC resolution settings */ #define HAVE_ADC_RES_T typedef enum { ADC_RES_6BIT = 0xf0, /**< ADC resolution: 6 bit is not supported */ ADC_RES_8BIT = 0xf1, /**< ADC resolution: 8 bit is not supported */ ADC_RES_9BIT = 0, /**< ADC resolution: 9 bit */ ADC_RES_10BIT = 1, /**< ADC resolution: 10 bit */ ADC_RES_11BIT = 2, /**< ADC resolution: 11 bit */ ADC_RES_12BIT = 3, /**< ADC resolution: 12 bit */ ADC_RES_14BIT = 0xf2, /**< ADC resolution: 14 bit is not supported */ ADC_RES_16BIT = 0xf3, /**< ADC resolution: 16 bit is not supported */ } adc_res_t; /** @} */ /** * @brief Number of ADC cahnnels that could be used at maximum * * @note GPIO37 and GPIO38 are usually not broken out on ESP32 modules and are * therefore not usable. The maximum number of ADC channels (ADC_NUMOF_MAX) * is therefore set to 16. */ #define ADC_NUMOF_MAX 16 /** Number of ADC channels determined from ADC_GPIOS */ extern const unsigned adc_chn_num; /** @} */ /** * @name DAC configuration * * ESP32 supports 2 DAC lines at GPIO25 and GPIO26. These DACs have a width of * 8 bits and produce voltages in the range from 0 V to 3.3 V (VDD_A). The 16 * bits DAC values given as parameter of function *dac_set* are down-scaled * to 8 bit. * * DAC_GPIOS in the board-specific peripheral configuration defines a list of * GPIOs that can be used as DAC channels. The order of the listed GPIOs * determines the mapping between the RIOT's DAC lines and the GPIOs. * * @note DAC_GPIOS must be defined even if there are no GPIOs that could be * used as DAC channels on the board. In this case, an empy list hast to be * defined which just contains the curly braces. * * DAC_NUMOF is determined automatically from the DAC_GPIOS definition. * * @note As long as the GPIOs listed in DAC_GPIOS are not initialized * as DAC channels with the *dac_init* function, they can be used for other * purposes. * @{ */ /** * @brief Number of DAC cahnnels that could be used at maximum. */ #define DAC_NUMOF_MAX 2 /** Number of DAC channels determined from DAC_GPIOS */ extern const unsigned dac_chn_num; /** @} */ /** * @name I2C configuration * * ESP32 has two built-in I2C interfaces. * * The board-specific configuration of the I2C interface I2C_DEV(n) requires * the defintion of * * I2Cn_SPEED, the bus speed, * I2Cn_SCL, the GPIO used as SCL signal, and * I2Cn_SDA, the GPIO used as SDA signal, * * where n can be 0 or 1. If they are not defined, the I2C interface * I2C_DEV(n) is not used. * * @note The configuration of the I2C interfaces I2C_DEV(n) must be in * continuous ascending order of n. * * I2C_NUMOF is determined automatically from board-specific peripheral * definitions of I2Cn_SPEED, I2Cn_SCK, and I2Cn_SDA. * * @{ */ /** Number of I2C interfaces determined from I2Cn_* definitions */ extern const unsigned i2c_bus_num; #define PERIPH_I2C_NEED_READ_REG /**< i2c_read_reg required */ #define PERIPH_I2C_NEED_READ_REGS /**< i2c_read_regs required */ #define PERIPH_I2C_NEED_WRITE_REG /**< i2c_write_reg required */ #define PERIPH_I2C_NEED_WRITE_REGS /**< i2c_write_regs required */ /** @} */ /** * @name PWM configuration * @{ * * PWM implementation uses ESP32's high-speed MCPWM modules. ESP32 has 2 such * modules, each with up to 6 channels (PWM_CHANNEL_NUM_DEV_MAX). Thus, the * maximum number of PWM devices is 2 and the maximum total number of PWM * channels is 12. * * PWM0_GPIOS and PWM1_GPIOS in the board-specific peripheral configuration * each define a list of GPIOs that can be used with the respective PWM * devices as PWM channels. The order of the listed GPIOs determines the * association between the RIOT PWM channels and the GPIOs. * * @note The definition of PWM0_GPIOS and PWM1_GPIOS can be omitted or * empty. In the latter case, they must at least contain the curly braces. * The corresponding PWM device can not be used in this case. * * PWM_NUMOF is determined automatically from the PWM0_GPIOS and PWM1_GPIOS * definitions. * * @note As long as the GPIOs listed in PWM0_GPIOS and PMW1_GPIOS are not * initialized as PWM channels with the *pwm_init* function, they can be used * other purposes. */ /** * @brief Maximum number of channels per PWM device. */ #define PWM_CHANNEL_NUM_DEV_MAX (6) /** Number of PWM devices determined from PWM0_GPIOS and PWM1_GPIOS. */ extern const unsigned pwm_dev_num; /** @} */ /** * @name SPI configuration * * ESP32 has four SPI controllers: * * - controller SPI0 is reserved for caching the flash memory * - controller SPI1 is reserved for external memories like flash and PSRAM * - controller SPI2 realizes interface HSPI that can be used for peripherals * - controller SPI3 realizes interface VSPI that can be used for peripherals * * Thus, a maximum of two SPI controllers can be used as peripheral interfaces: * * - VSPI * - HSPI * * SPI interfaces could be used in quad SPI mode, but RIOT's low level * device driver doesn't support it. * * The board-specific configuration of the SPI interface SPI_DEV(n) requires * the defintion of * * - SPIn_CTRL, the SPI controller which is used for the interface (VSPI or HSPI), * - SPIn_SCK, the GPIO used as clock signal * - SPIn_MISO, the GPIO used as MISO signal * - SPIn_MOSI, the GPIO used as MOSI signal, and * - SPIn_CS0, the GPIO used as CS signal when the cs parameter in spi_aquire * is GPIO_UNDEF, * * where n can be 0 or 1. * * @note The configuration of the SPI interfaces SPI_DEV(n) should be in * continuous ascending order of n. * * SPI_NUMOF is determined automatically from the board-specific peripheral * definitions of SPIn_*. */ /** Number of SPI interfaces determined from SPI_* definitions */ extern const unsigned spi_bus_num; #define PERIPH_SPI_NEEDS_TRANSFER_BYTE /**< requires function spi_transfer_byte */ #define PERIPH_SPI_NEEDS_TRANSFER_REG /**< requires function spi_transfer_reg */ #define PERIPH_SPI_NEEDS_TRANSFER_REGS /**< requires function spi_transfer_regs */ /** @} */ /** * @name Timer configuration depenend on which implementation is used * * Timers are MCU built-in feature and not board-specific. They are therefore * configured here. * @{ */ #ifdef MODULE_ESP_HW_COUNTER /** hardware ccount/ccompare registers are used for timer implementation */ #define TIMER_NUMOF (2) #define TIMER_CHANNELS (1) #else /** hardware timer modules are used for timer implementation (default) */ #define TIMER_NUMOF (3) #define TIMER_CHANNELS (1) #endif /** Timer used for system time */ #define TIMER_SYSTEM TIMERG0.hw_timer[0] /** @} */ /** * @name UART configuration * * ESP32 supports up to three UART devices. UART_DEV(0) has a fixed pin * configuration and is always available. All ESP32 boards use it as standard * configuration for the console. * * UART_DEV(0).TXD GPIO1 * UART_DEV(0).RXD GPIO3 * * The pin configuration of UART_DEV(1) and UART_DEV(2) are defined in * board specific peripheral configuration by * * UARTn_TXD, the GPIO used as TxD signal, and * UARTn_RXD, the GPIO used as RxD signal, * * where n can be 2 or 3. If they are not defined, the UART interface * UART_DEV(n) is not used. * * UART_NUMOF is determined automatically from the board-specific peripheral * definitions of UARTn_TXD and UARTn_RXD. * * @{ */ /** @} */ #ifdef __cplusplus } #endif #endif /* PERIPH_CPU_H */ /** @} */