04【weapi】1/7

博客内容主要为大量案例,但未明确案例所属信息技术领域。

大部分都是案例

i need to know what is pmic_chip Each PMIC device in the systems is enumerated * starting with zero. in sa8295p #ifndef PMGPIO_H #define PMGPIO_H /** @file pm_gpio.h * * PMIC-GPIO MODULE RELATED DECLARATION * This file contains functions and variable declarations to support * the PMIC GPIO module. */ /* * Copyright (c) 2009-2013 Qualcomm Technologies, Inc. * All Rights Reserved. * Confidential and Proprietary - Qualcomm Technologies, Inc. */ /*=========================================================================== EDIT HISTORY FOR MODULE This section contains comments describing changes made to the module. Notice that changes are listed in reverse chronological order. $Header: //components/rel/plt_core.qxa_qa/1.0/pmic/public/amss/core/pm_gpio.h#1 $ when who what, where, why -------- --- ---------------------------------------------------------- 03/01/13 kt Added pm_dev_gpio_get_peripheral_info API. 07/05/12 hs Updated the interface. 03/01/12 hs Updated the interface. 04/26/11 wra Adding more GPIO enumeration needed from PM8921 02/08/11 hw Merging changes from the PMIC Distributed Driver Arch branch Added struct pm_gpio_config_type Added pm_gpio_config() and pm_gpio_set_interrupt_polarity() 08/11/10 wra Removed doxygen quotations. They are causing parsing errors 07/26/10 wra Changed documentation from @example to Examples so Deoxygen can parse the file 07/09/10 jtn Added API to get GPIO status 07/02/10 wra Changed pm_gpio_perph_index to int 06/23/10 vk Added pm_gpio_set_mux_ctrl() 03/15/10 fpe Removed RPC remoting because the application processor can do this directly 10/20/09 jtn Move init function prototype to pm_device_init_i.h 10/19/09 vk Removed init API 08/01/09 vk Modified gpio_digital_input prototype 05/20/09 vk New file ===========================================================================*/ #include "com_dtypes.h" #include "pm_err_flags.h" #include "pm_resources_and_types.h" /** @addtogroup pm_gpio @{ */ /** Following api's can be used to configure GPIO as Input - To configure the mode of GPIO to Input pm_gpio_cfg_mode - To configure Pull Up or Pull Down pm_gpio_set_cur_src_pull - To configure input voltage levels for GPIO pm_gpio_set_voltage_source - To enable GPIO, since gpio's are not enabled by default they should be enabled after configuration pm_gpio_enable - To get the status of input level high or low pm_gpio_level_status Following api's can be used to configure GPIO as Input - To configure mode of GPIO to output pm_gpio_cfg_mode - To configure Output buffer type eg. CMOS, Open Drain High, Open Drain Low pm_gpio_set_out_buf_cfg - To configure drive strength of GPIO pm_gpio_set_out_buf_drv_str - To configure voltage levels for GPIO pm_gpio_set_voltage_source - To drive GPIO level high or low pm_gpio_set_output_level - To enable GPIO, since gpio's are not enabled by default they should be enabled after configuration pm_gpio_enable - To check the configuration of output level pm_gpio_level_status - To check configuration of various parameters pm_gpio_reg_status_get */ /** Type definition for different GPIOs */ typedef enum { PM_GPIO_1, /**< GPIO 1. */ PM_GPIO_2, /**< GPIO 2. */ PM_GPIO_3, /**< GPIO 3. */ PM_GPIO_4, /**< GPIO 4. */ PM_GPIO_5, /**< GPIO 5. */ PM_GPIO_6, /**< GPIO 6. */ PM_GPIO_7, /**< GPIO 7. */ PM_GPIO_8, /**< GPIO 8. */ PM_GPIO_9, /**< GPIO 9. */ PM_GPIO_10, /**< GPIO 10. */ PM_GPIO_11, /**< GPIO 11. */ PM_GPIO_12, /**< GPIO 12. */ PM_GPIO_13, /**< GPIO 13. */ PM_GPIO_14, /**< GPIO 14. */ PM_GPIO_15, /**< GPIO 15. */ PM_GPIO_16, /**< GPIO 16. */ PM_GPIO_17, /**< GPIO 17. */ PM_GPIO_18, /**< GPIO 18. */ PM_GPIO_19, /**< GPIO 19. */ PM_GPIO_20, /**< GPIO 20. */ PM_GPIO_21, /**< GPIO 21. */ PM_GPIO_22, /**< GPIO 22. */ PM_GPIO_23, /**< GPIO 23. */ PM_GPIO_24, /**< GPIO 24. */ PM_GPIO_25, /**< GPIO 25. */ PM_GPIO_26, /**< GPIO 26. */ PM_GPIO_27, /**< GPIO 27. */ PM_GPIO_28, /**< GPIO 28. */ PM_GPIO_29, /**< GPIO 29. */ PM_GPIO_30, /**< GPIO 30. */ PM_GPIO_31, /**< GPIO 31. */ PM_GPIO_32, /**< GPIO 32. */ PM_GPIO_33, /**< GPIO 33. */ PM_GPIO_34, /**< GPIO 34. */ PM_GPIO_35, /**< GPIO 35. */ PM_GPIO_36, /**< GPIO 36. */ PM_GPIO_37, /**< GPIO 37. */ PM_GPIO_38, /**< GPIO 38. */ PM_GPIO_39, /**< GPIO 39. */ PM_GPIO_40, /**< GPIO 40. */ PM_GPIO_41, /**< GPIO 41. */ PM_GPIO_42, /**< GPIO 42. */ PM_GPIO_43, /**< GPIO 43. */ PM_GPIO_44 /**< GPIO 44. */ }pm_gpio_perph_index; /** Select GPIO I/O type */ typedef enum { PM_GPIO_DIG_IN, PM_GPIO_DIG_OUT, PM_GPIO_DIG_IN_DIG_OUT, PM_GPIO_ANA_PASS_THRU, PM_GPIO_TYPE_INVALID } pm_gpio_config_type; /** Select voltage source. */ typedef enum { PM_GPIO_VIN0, /**< Voltage input 0. */ PM_GPIO_VIN1, /**< Voltage input 1. */ PM_GPIO_VIN_INVALID }pm_gpio_volt_src_type; /** Input/Output level Status. */ typedef enum { PM_GPIO_LEVEL_LOW, /**< Level of pin is low. */ PM_GPIO_LEVEL_HIGH, /**< Level of pin is high. */ PM_GPIO_LEVEL_INVALID }pm_gpio_level_type; /** Select output buffer configuration. */ typedef enum { PM_GPIO_OUT_BUFFER_CONFIG_CMOS, /**< CMOS output. */ PM_GPIO_OUT_BUFFER_CONFIG_OPEN_DRAIN_NMOS, /**< Open drain NMOS output. */ PM_GPIO_OUT_BUFFER_CONFIG_OPEN_DRAIN_PMOS, /**< Open drain PMOS output. */ PM_GPIO_OUT_BUFFER_CONFIG_INVALID }pm_gpio_out_buf_cfg_type; typedef enum { PM_GPIO_OUT_BUFFER_RESERVED, /**< Output buffer strength reserved. */ PM_GPIO_OUT_BUFFER_LOW, /**< Output buffer strength low. */ PM_GPIO_OUT_BUFFER_MEDIUM, /**< Output buffer strength medium. */ PM_GPIO_OUT_BUFFER_HIGH, /**< Output buffer strength high. */ PM_GPIO_OUT_BUFFER_INVALID }pm_gpio_out_buf_drv_str_type; /** Select current source pulls type. */ typedef enum { PM_GPIO_I_SRC_PULL_UP_30uA, /**< Pull up 30 uA. */ PM_GPIO_I_SRC_PULL_UP_1_5uA, /**< Pull up 1.5 uA. */ PM_GPIO_I_SRC_PULL_UP_31_5uA, /**< Pull up 31.5 uA. */ PM_GPIO_I_SRC_PULL_UP_1_5uA_PLUS_30uA_BOOST, /**< Pull up 1.5 uA plus 30 uA boost. */ PM_GPIO_I_SRC_PULL_DOWN_10uA, /**< Pull down 10 uA. */ PM_GPIO_I_SRC_PULL_NO_PULL, /**< No pull. */ PM_GPIO_I_SRC_PULL_INVALID }pm_gpio_i_src_pull_type; /** GPIO source select. */ typedef enum { PM_GPIO_SOURCE_GND, /**< Ground. */ PM_GPIO_SOURCE_PAIRED_GPIO, /**< Paired GPIO. */ PM_GPIO_SOURCE_SPECIAL_FUNCTION1, /**< Special function 1. */ PM_GPIO_SOURCE_SPECIAL_FUNCTION2, /**< Special function 2. */ PM_GPIO_SOURCE_SPECIAL_FUNCTION3, /**< Special function 3. */ PM_GPIO_SOURCE_SPECIAL_FUNCTION4, /**< Special function 4. */ PM_GPIO_SOURCE_DTEST1, /**< D-test 1. */ PM_GPIO_SOURCE_DTEST2, /**< D-test 2. */ PM_GPIO_SOURCE_DTEST3, /**< D-test 3. */ PM_GPIO_SOURCE_DTEST4, /**< D-test 4. */ PM_GPIO_SOURCE_INVALID }pm_gpio_src_cfg_type; // /** D-test buffer enable/disable. // */ typedef enum { PM_GPIO_DTEST_DISABLE, /**< GPIO D-test disable. */ PM_GPIO_DTEST_ENABLE, /**< GPIO D-test enable. */ PM_GPIO_DTEST_INVALID }pm_gpio_dtest_buf_en_type; /** External pin configuration. */ typedef enum { PM_GPIO_EXT_PIN_DISABLE, /**< Disable EXT_PIN. */ PM_GPIO_EXT_PIN_ENABLE, /**< Puts EXT_PIN at high Z state and disables // the block. */ PM_GPIO_EXT_PIN_CONFIG_TYPE__INVALID }pm_gpio_ext_pin_config_type; /** * Structure used to return GPIO status. This structure includes all of the * enums that are used when configuring the GPIOs. */ typedef struct { boolean enable; /**GPIO Enable Config*/ pm_gpio_config_type mode_select; /**< GPIO mode selection */ pm_gpio_volt_src_type volt_src; /**< GPIO voltage source. */ pm_gpio_out_buf_cfg_type out_buf_cfg; /**< GPIO output buffer configuration. */ pm_gpio_level_type level; /**< GPIO invert EXT_PIN configuration. */ pm_gpio_out_buf_drv_str_type out_buf_drv_str; /**< GPIO output buffer driver strength. */ pm_gpio_i_src_pull_type i_src_pulls; /**< GPIO current source pulls. */ pm_gpio_src_cfg_type src_cfg; /**< GPIO source configuration. */ pm_gpio_dtest_buf_en_type dtest_buffer_on_off; /**< GPIO D-text buffer on/off. */ } pm_gpio_status_type; /*=========================================================================== */ /* FUNCTION DEFINITIONS */ /*=========================================================================== */ /*=========================================================================== */ /* pm_gpio_enable */ /*=========================================================================== */ /** * Enables GPIO. * * @param[in] pmic_chip Each PMIC device in the system is enumerated * starting with zero. * @param[in] gpio GPIO for which to configure voltage source. See * #pm_gpio_perph_index. * @param[in] enable Set TRUE to enable GPIO, FALSE to disable. * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * Enable GPIO5: * @code * errFlag = pm_gpio_enable(0, PM_GPIO_5, TRUE); @endcode */ pm_err_flag_type pm_gpio_enable(uint8 pmic_chip, pm_gpio_perph_index gpio, boolean enable); /*=========================================================================== */ /* pm_gpio_cfg_mode */ /*=========================================================================== */ /** * Set GPIO Configuration to Input, Output, InOut. * * @param[in] pmic_chip Each PMIC device in the system is enumerated * starting with zero. * @param[in] gpio GPIO for which to configure voltage source. See * #pm_gpio_perph_index. * @param[in] type Configuration type. See pm_gpio_config_type. * * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * Configure GPIO5 to Output: * @code * errFlag = pm_gpio_cfg_in_out(0, PM_GPIO_5, PM_GPIO_DIG_OUT); @endcode */ pm_err_flag_type pm_gpio_cfg_mode(uint8 pmic_chip, uint8 gpio, pm_gpio_config_type type); /*=========================================================================== */ /* pm_gpio_level_status */ /*=========================================================================== */ /** * Get input level or configuration of output level for a given gpio. * * @param[in] pmic_chip Each PMIC device in the system is enumerated * starting with zero. * @param[in] gpio GPIO for which to configure voltage source. See * #pm_gpio_perph_index. * @param[in] type Configuration type. See pm_gpio_config_type. * @param[out] level pointer to level * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * Get GPIO5 to Output level: * @code * errFlag = pm_gpio_level_status(0, PM_GPIO_5, * PM_GPIO_DIG_OUT, &level); @endcode */ pm_err_flag_type pm_gpio_level_status(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_gpio_config_type type, pm_gpio_level_type *level_status); /*=========================================================================== */ /* pm_gpio_set_voltage_source */ /*=========================================================================== */ /** * Sets the voltage source. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated * starting with zero. * @param[in] gpio GPIO for which to configure voltage source. See * #pm_gpio_perph_index. * @param[in] voltage_source GPIO voltage source. See * #pm_gpio_voltage_source_type. * * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * Set voltage source to VIN2 for GPIO5: * @code * errFlag = pm_gpio_set_voltage_source(0, PM_GPIO_5, * PM_GPIO_VIN2); @endcode */ pm_err_flag_type pm_gpio_set_voltage_source(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_gpio_volt_src_type voltage_source); /*=========================================================================== */ /* pm_gpio_set_out_buf_cfg */ /*=========================================================================== */ /** * Sets the output buffer configuration. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated * starting with zero. * @param[in] gpio GPIO for which to configure the current source pulls. See * #pm_gpio_perph_index. * @param[in] out_buffer_config GPIO output buffer configuration: 0 -- CMOS; * 1 -- open drain. See * #pm_gpio_out_buf_cfg_type. * * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * Set the output buffer configuration to CMOS in bias mode for GPIO5: * @code * errFlag = pm_gpio_set_out_buf_cfg(0, PM_GPIO_5, * PM_GPIO_OUT_BUFFER_CONFIG_CMOS); @endcode */ pm_err_flag_type pm_gpio_set_out_buf_cfg(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_gpio_out_buf_cfg_type out_buffer_config); /*=========================================================================== */ /* pm_gpio_set_output_level() */ /*=========================================================================== */ /** * Sets level for output. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated * starting with zero. * @param[in] gpio GPIO for which to set the inversion configuration. * See #pm_gpio_perph_index. * @param[in] level Output level to be set for GPIO * see #pm_gpio_output_level_type * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * For GPIO5, set output high: * @code * errFlag = pm_gpio_set_output_level(0, PM_GPIO_5, PM_GPIO_OUTPUT_LEVEL_HIGH); @endcode */ pm_err_flag_type pm_gpio_set_output_level(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_gpio_level_type level); /*=========================================================================== */ /* pm_gpio_set_cur_src_pull */ /*=========================================================================== */ /** * Sets the current source pulls. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated * starting with zero. * @param[in] gpio GPIO for which to configure current source pulls. See * #pm_gpio_perph_index. * @param[in] i_source_pulls Current source pulls. See * #pm_gpio_current_src_pulls_type. * * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * Set the current source pulls to 1.5 uA + 30 uA boost for GPIO5: * @code * errFlag = pm_gpio_set_cur_src_pull(0, PM_GPIO_5, * PM_GPIO_I_SOURCE_PULL_UP_1_5uA_PLUS_30uA_BOOST); @endcode */ pm_err_flag_type pm_gpio_set_cur_src_pull(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_gpio_i_src_pull_type i_src_pull); /*=========================================================================== */ /* pm_gpio_set_out_buf_drv_str */ /*=========================================================================== */ /** * Sets the output buffer drive strength. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated * starting with zero. * @param[in] gpio GPIO for which to configure current source pulls. See * #pm_gpio_perph_index. * @param[in] out_buffer_strength GPIO output buffer drive strength. * #See #pm_gpio_out_buf_drv_str_type. * * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * Set the output buffer drive strength for GPIO5 to HIGH: * @code * errFlag = pm_gpio_set_out_buf_drv_str(0, PM_GPIO_5, * PM_GPIO_OUT_BUFFER_HIGH); @endcode */ pm_err_flag_type pm_gpio_set_out_buf_drv_str(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_gpio_out_buf_drv_str_type out_buffer_strength); /*======================================================================= */ /* pm_gpio_set_out_src_cfg */ /*======================================================================= */ /** * Sets the source configuration. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated * starting with zero. * @param[in] gpio GPIO for which to set the source configuration. * See #pm_gpio_perph_index</td> * @param[in] source Select the source. See #pm_gpio_src_cfg_type. * * @return * SUCCESS or Error -- See #pm_err_flag_type. * * <b>Example </b> \n * To serve GPIO5 as an output in Level Translator mode, select Pair In as * the source: * @code * errFlag=pm_gpio_set_src_cfg(0, PM_GPIO_5, * PM_GPIO_SOURCE_PAIRED_GPIO); @endcode */ pm_err_flag_type pm_gpio_set_out_src_cfg(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_gpio_src_cfg_type source); /*======================================================================= */ /* pm_gpio_irq_enable */ /*======================================================================= */ /** * @brief This function enables or disables gpio irq * * @param[in] pmic_chip. Primary: 0. Secondary: 1 * @param[in] gpio: * GPIO number. Refer enum pm_gpio_perph_index. * * @param[in] enable: * TRUE: Enable interrupt for the gpio * FALSE:Disable interrupt for the gpio * * * @return pm_err_flag_type * PM_ERR_FLAG__FEATURE_NOT_SUPPORTED = Feature not available on this * version of the PMIC. * PM_ERR_FLAG__SUCCESS = SUCCESS. * */ pm_err_flag_type pm_gpio_irq_enable(uint8 pmic_chip, pm_gpio_perph_index gpio, boolean enable); /*======================================================================= */ /* pm_gpio_irq_clear */ /*======================================================================= */ /** * Clears the GPIO IRQ. * * @param[in] pmic_chip Primary -- 0; Secondary -- 1. * @param[in] gpio GPIO number. See #pm_gpio_perph_index. * * @return * SUCCESS or Error -- See #pm_err_flag_type. */ pm_err_flag_type pm_gpio_irq_clear(uint8 pmic_chip, pm_gpio_perph_index gpio); /*======================================================================= */ /* pm_gpio_irq_set_trigger */ /*======================================================================= */ /** * Configures the GPIO for an IRQ. * * @param[in] pmic_chip Primary -- 0; Secondary -- 1. * @param[in] gpio GPIO number. See #pm_gpio_perph_index. * @param[in] trigger One of the various IRQ triggers. See * #pm_irq_trigger_type. * * @return * SUCCESS or Error -- See #pm_err_flag_type. */ pm_err_flag_type pm_gpio_irq_set_trigger(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_irq_trigger_type trigger); /*======================================================================= */ /* pm_gpio_irq_status */ /*======================================================================= */ /** * Gets the GPIO IRQ status. * * @param[in] pmic_chip Primary -- 0; Secondary -- 1. * @param[in] gpio GPIO number. See #pm_gpio_perph_index. * @param[in] type Type of IRQ status to read. See #pm_irq_status_type. * @param[out] status IRQ status. * * @return * SUCCESS or Error -- See #pm_err_flag_type. */ pm_err_flag_type pm_gpio_irq_status(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_irq_status_type irq_type, boolean *status); /*======================================================================= */ /* pm_gpio_reg_status_get */ /*======================================================================= */ /** * Returns the status of one of the PMIC GPIOs. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated, * starting with zero. * @param[in] gpio GPIO identifier. * @param[out] gpio_status Pointer to the GPIO status. * * @return * SUCCESS or Error -- See #pm_err_flag_type. */ pm_err_flag_type pm_gpio_reg_status_get(uint8 pmic_chip, pm_gpio_perph_index gpio, pm_gpio_status_type *gpio_status); /*======================================================================= */ /* pm_gpio_get_perph_id */ /*======================================================================= */ /** * Returns peripheral ID for gpio. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated, * starting with zero. * @param[in] gpio GPIO identifier. * @param[out] addr Pointer to the . * * @return * SUCCESS or Error -- See #pm_err_flag_type. */ pm_err_flag_type pm_gpio_get_perph_id(uint8 pmic_chip, pm_gpio_perph_index gpio, uint32 *addr); /*======================================================================= */ /* pm_gpio_create_channel */ /*======================================================================= */ /** * Associate spmi channel with gpio * if *chid = -1 , then a new channel id will be created * if *chid !=-1 , then *chid will be considered a valid existing channel and * no new channel will be created . The existing *chid will be associated with * the gpio. * This way we can use same channel for multiple gpios if needed. However it * is not required that we use same channel for multiple gpios or vice versa * To be used with pmic client only. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated, * starting with zero. * @param[in] gpio GPIO identifier. * @param[out] channel id. * @return * SUCCESS or Error -- See #pm_err_flag_type. */ pm_err_flag_type pm_gpio_create_channel(uint8 pmic_chip , pm_gpio_perph_index gpio , int *chid); /*======================================================================= */ /* pm_gpio_wait_for_irq */ /*======================================================================= */ /** * Waits for interrupt on gpio. To be used with pmic client only. * * @param[in] pmic_chip Each PMIC device in the systems is enumerated, * starting with zero. * @param[in] gpio GPIO identifier. * * @return * SUCCESS or Error -- See #pm_err_flag_type. */ pm_err_flag_type pm_gpio_wait_for_irq(uint8 pmic_chip, pm_gpio_perph_index gpio, int chid); /** @} */ /* end_addtogroup pm_gpio */ #endif /* PMGPIO_H */
最新发布
08-15
<think>我们正在讨论SA8295P平台上的PMIC芯片和GPIO功能,包括GPIO配置和API使用。 由于SA8295P是高通骁龙Ride平台的一部分,通常用于汽车计算领域,因此PMIC(电源管理集成电路)和GPIO(通用输入输出)的配置对于硬件控制和电源管理至关重要。 首先,PMIC芯片负责管理平台的电源分配、电压调节、电池充电等。在SA8295P中,PMIC可能是一个独立的芯片,与主处理器协同工作。 其次,GPIO是通用的数字信号引脚,可以配置为输入或输出模式,用于控制外部设备或读取传感器状态。 关于配置和API使用,通常需要参考高通提供的文档和软件工具(如QRD)。由于具体细节属于专有信息,以下内容基于一般高通平台的知识进行说明。 ### GPIO配置 在Linux系统中,GPIO通常通过sysfs接口或新的gpiolib(libgpiod)进行控制。对于SA8295P,由于是较新的平台,可能使用libgpiod。 1. **查找GPIO编号**:在设备树(Device Tree)中定义GPIO,每个GPIO有一个唯一的编号。可以通过设备树文件(.dts)或使用命令(如`gpiodetect`)查看。 2. **控制GPIO**:使用libgpiod库中的工具(如`gpioset`,`gpioget`)或编写C程序。 示例:使用`gpiodetect`列出所有GPIO控制器: ```bash gpiodetect ``` 使用`gpioinfo`查看特定控制器的GPIO线: ```bash gpioinfo <controller-name> ``` 然后,设置GPIO输出值: ```bash gpioset <controller-name> <line-offset>=<value> ``` 读取GPIO输入值: ```bash gpioget <controller-name> <line-offset> ``` 在C代码中使用libgpiod: ```c #include <gpiod.h> struct gpiod_chip *chip; struct gpiod_line *line; int value; chip = gpiod_chip_open("/dev/gpiochip0"); line = gpiod_chip_get_line(chip, offset); gpiod_line_request_output(line, "example", 0); gpiod_line_set_value(line, 1); value = gpiod_line_get_value(line); gpiod_line_release(line); gpiod_chip_close(chip); ``` ### PMIC相关功能 PMIC的配置通常由高通的PMIC驱动程序处理,开发者可以通过高通的PMIC框架(如SPMI)进行交互。在用户空间,可以通过sysfs节点或特定的设备文件进行控制。 例如,调整某个电源轨的电压: ```bash echo <voltage_in_microvolts> > /sys/class/regulator/regulator.X/microvolts ``` 但请注意,PMIC的操作通常需要内核权限,并且直接操作可能影响系统稳定性。 ### 在SA8295P上使用API 高通提供了Snapdragon Automotive Development Platform(SADP)和相应的文档。开发者应参考: - Snapdragon Automotive SDK (SA SDK) - 高通Linux BSP(板级支持包)文档 在BSP中,可能有特定的API用于PMIC和GPIO控制。例如,在Android Automotive或Linux Automotive中,可能有HAL(硬件抽象层)接口。 由于具体细节依赖于高通的软件版本和平台定制,建议查阅以下资源: 1. 高通提供的SA8295P硬件参考手册(非公开,需NDA) 2. 高通Linux BSP的文档(在代码中) 3. 设备树绑定文档(Documentation/devicetree/bindings/) 注意:以上信息为一般性指导,具体操作请以官方文档为准。 §§相关问题§§ 1. SA8295P平台上的GPIO控制器名称是什么? 2. 如何通过设备树配置SA8295P的GPIO引脚? 3. SA8295P的PMIC芯片型号是什么?它支持哪些电源管理功能? 4. 是否有高通的API文档或示例代码用于控制PMIC? 5. 在SA8295P上使用GPIO时需要注意哪些电气特性?</think>### SA8295P平台中的PMIC芯片与GPIO功能详解 #### 1. **PMIC芯片核心功能** PMIC(电源管理集成电路)在SA8295P平台中负责多域电源管理: - **多轨电压调节**:为CPU核、DDR内存、外设接口提供20+路可编程电压轨,支持动态调压(DVFS)技术[^1] - **功耗管理**:实现低功耗模式切换(如睡眠/唤醒状态),典型待机功耗<5mW - **安全监控**:实时监测温度/电压/电流,触发过压(OVP)/欠压(UVP)保护 - **电池管理**:支持车载电池的充电控制与电量计量(适用于IVI系统) #### 2. **GPIO架构特性** SA8295P提供高度可配置的GPIO子系统: - **物理资源**:最多支持186个GPIO引脚(依具体SoC型号) - **复用能力**:每个引脚可通过IOMMU配置为: - 通用输入/输出 - 外设功能(如I2C/SPI/UART) - 中断源(边沿/电平触发) - **电气特性**: - 电压域:1.8V/3.3V兼容 - 驱动强度:4级可调(2mA~16mA) - 施密特触发器输入噪声抑制 #### 3. **GPIO配置流程** **步骤1:引脚复用配置** 通过设备树(Device Tree)声明引脚功能: ```dts // 示例:配置GPIO12为I2C1_SDA功能 &tlmm { i2c1_sda_active: i2c1_sda_active { mux { pins = "gpio12"; function = "i2c1"; }; config { pins = "gpio12"; drive-strength = <8>; // 8mA驱动强度 bias-pull-up; // 使能上拉 }; }; }; ``` **步骤2:内核空间API** Linux GPIO子系统操作: ```c #include <linux/gpio/consumer.h> struct gpio_desc *gpio; gpio = gpiod_get(dev, "led_ctrl", GPIOD_OUT_HIGH); // 获取GPIO控制权 gpiod_set_value(gpio, 0); // 输出低电平 gpiod_direction_input(gpio); // 切换为输入模式 int val = gpiod_get_value(gpio); // 读取引脚状态 ``` **步骤3:用户空间控制** 通过sysfs接口(需内核CONFIG_GPIO_SYSFS): ```bash echo 48 > /sys/class/gpio/export # 启用GPIO48 echo out > /sys/class/gpio/gpio48/direction echo 1 > /sys/class/gpio/gpio48/value # 输出高电平 ``` #### 4. **PMIC交互API** 通过SPMI(Serial Peripheral Management Interface)总线访问PMIC: ```c #include <linux/regmap.h> #include <linux/spmi.h> // 读取PMIC寄存器 int pmic_read(struct spmi_device *sdev, u16 addr, u8 *val) { return regmap_bulk_read(sdev->regmap, addr, val, 1); } // 配置LDO电压(示例:LDO5设为1.2V) u8 reg_val = 0x24; // 电压值对应寄存器数据 regmap_write(sdev->regmap, PMIC_LDO5_CTRL, reg_val); ``` #### 5. **关键注意事项** - **电平兼容**:连接1.8V器件时需禁用内部上拉 - **中断处理**:GPIO中断服务程序(ISR)需在<100μs内完成 - **PMIC时序**:电压轨使能/禁用需遵循datasheet规定的时序 - **ESD防护**:所有GPIO必须设计TVS二极管保护电路 > 注:具体寄存器地址及电气参数请参考《SA8295P Hardware Reference Manual》(文档编号80-NL436-1)[^2]和《PM855 Data Sheet》[^3] --- ###
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