S32 Design Studio PE工具配置GPIO-编程知识

首先我们来讲最简单的GPIO配置

代码生成

按照下图步骤就能配置一个基本的GPIO口，在组件里面选择pin_mux，选中就能配置使能和方向，no pin routed就是没有配置的。GPIO口分ABCDE组，每组从0到最大的序号。

然后在functional properties里面配置具体每一个引脚的复用、锁定、上拉下拉、数字过滤、输出初始值等等……

于是我们生成代码来看看，在文件pin_mux.c当中，会生成一个类型为pin_settings_config_t的g_pin_mux_InitConfigArr结构体数组。数组长度NUM_OF_CONFIGURED_PINS是GPIO口总数量，在pin_mux.h当中，也是会随着代码一起生成。

pin_settings_config_t g_pin_mux_InitConfigArr[NUM_OF_CONFIGURED_PINS] = 
{……{.base          = PORTB,.pinPortIdx    = 16u,.pullConfig    = PORT_INTERNAL_PULL_NOT_ENABLED,.passiveFilter = false,.driveSelect   = PORT_LOW_DRIVE_STRENGTH,.mux           = PORT_MUX_AS_GPIO,.pinLock       = false,.intConfig     = PORT_DMA_INT_DISABLED,.clearIntFlag  = false,.gpioBase      = PTB,.direction     = GPIO_OUTPUT_DIRECTION,.digitalFilter = false,.initValue     = 0u,},{.base          = PORTB,.pinPortIdx    = 15u,.pullConfig    = PORT_INTERNAL_PULL_NOT_ENABLED,.passiveFilter = false,.driveSelect   = PORT_LOW_DRIVE_STRENGTH,.mux           = PORT_MUX_ADC_INTERLEAVE,.pinLock       = false,.intConfig     = PORT_DMA_INT_DISABLED,.clearIntFlag  = false,.gpioBase      = PTB,.digitalFilter = false,}……
}

配置对应

接下来我们一项一项看每一项配置是怎么对应代码的，base对应的是所在组的地址，gpioBase对应的是所在组的控制寄存器的地址。

PE自己对应的，使能就有，不用配置。

/** Peripheral PORTB base address */
#define PORTB_BASE                               (0x4004A000u)
/** Peripheral PORTB base pointer */
#define PORTB                                    ((PORT_Type *)PORTB_BASE)/** Peripheral PTB base address */
#define PTB_BASE                                 (0x400FF040u)
/** Peripheral PTB base pointer */
#define PTB                                      ((GPIO_Type *)PTB_BASE)

pinPortIdx是该GPIO口在组内的序号

pullConfig有三个可选，上拉下拉和悬浮。

/*!* @brief Internal resistor pull feature selection* Implements : port_pull_config_t_Class*/
typedef enum
{PORT_INTERNAL_PULL_NOT_ENABLED   = 0U,  /*!< internal pull-down or pull-up resistor is not enabled.           */PORT_INTERNAL_PULL_DOWN_ENABLED  = 1U,  /*!< internal pull-down resistor is enabled. @internal gui name="Down"*/PORT_INTERNAL_PULL_UP_ENABLED    = 2U   /*!< internal pull-up resistor is enabled. @internal gui name="Up"    */
} port_pull_config_t;

对应配置的pull select，不过要先将pull enable使能才行，不然就是默认的PORT_INTERNAL_PULL_NOT_ENABLED

passiveFilter被动滤波，一般不用，对应配置当中的Passive Filter

driveSelect驱动选择，就是上下拉的力量大小，电阻越小拉的电流越大。

/*!* @brief Configures the drive strength.* Implements : port_drive_strength_t_Class*/
typedef enum
{
#if FEATURE_PINS_HAS_DRIVE_STRENGTH_CONTROLPORT_STRENGTH_DISABLED      = 0U, /*!< Output driver disabled                                         */PORT_LOW_DRIVE_STRENGTH     = 1U, /*!< Low drive strength is configured. Resistor is set to 240 Ohm   */PORT_STR1_DRIVE_STRENGTH    = 1U, /*!< Resistor is set to 240 Ohm                                     */PORT_STR2_DRIVE_STRENGTH    = 2U, /*!< Resistor is set to 240 / 2 Ohm = 120 Ohm                       */PORT_STR3_DRIVE_STRENGTH    = 3U, /*!< Resistor is set to 240 / 3 Ohm = 80 Ohm                        */PORT_STR4_DRIVE_STRENGTH    = 4U, /*!< Resistor is set to 240 / 4 Ohm = 60 Ohm                        */PORT_STR5_DRIVE_STRENGTH    = 5U, /*!< Resistor is set to 240 / 5 Ohm = 48 Ohm                        */PORT_STR6_DRIVE_STRENGTH    = 6U, /*!< Resistor is set to 240 / 6 Ohm = 40 Ohm                        */PORT_STR7_DRIVE_STRENGTH    = 7U, /*!< Resistor is set to 240 / 7 Ohm = 34 Ohm                        */PORT_HIGH_DRIVE_STRENGTH    = 7U  /*!< High drive strength is configured. Resistor is set to 240 Ohm  */
#else /* if not FEATURE_PINS_HAS_DRIVE_STRENGTH_CONTROL */PORT_LOW_DRIVE_STRENGTH     = 0U,    /*!< low drive strength is configured. @internal gui name="Low"  */PORT_HIGH_DRIVE_STRENGTH    = 1U     /*!< high drive strength is configured. @internal gui name="High"*/
#endif /* if FEATURE_PINS_HAS_DRIVE_STRENGTH_CONTROL */
} port_drive_strength_t;

对应配置Drive Strength，例子当中的这个芯片没那么多可以选的，只能选个low或者high。

mux复用功能，一般都是PORT_MUX_AS_GPIO，ALT也就是alternative，如果复用ADC就是用PORT_MUX_ADC_INTERLEAVE。

/*!* @brief Configures the Pin mux selection* Implements : port_mux_t_Class*/
typedef enum
{PORT_PIN_DISABLED            = 0U,  /*!< corresponding pin is disabled, but is used as an analog pin       */PORT_MUX_AS_GPIO             = 1U,  /*!< corresponding pin is configured as GPIO                           */PORT_MUX_ALT2                = 2U,  /*!< chip-specific                                                     */PORT_MUX_ALT3                = 3U,  /*!< chip-specific                                                     */PORT_MUX_ALT4                = 4U,  /*!< chip-specific                                                     */PORT_MUX_ALT5                = 5U,  /*!< chip-specific                                                     */PORT_MUX_ALT6                = 6U,  /*!< chip-specific                                                     */PORT_MUX_ALT7                = 7U,  /*!< chip-specific                                                     */
#if FEATURE_PINS_HAS_ADC_INTERLEAVE_ENPORT_MUX_ADC_INTERLEAVE      = 8U   /*!< when selected, ADC Interleaved channel is connected to current pin*   and disconnected to opposed pin* ADC1_SE14-PTB15 | ADC1_SE15-PTB16 | ADC0_SE8-PTC0  | ADC0_SE9-PTC1* ADC1_SE14-PTB0  | ADC1_SE15-PTB1  | ADC0_SE8-PTB13 | ADC0_SE9-PTB14 */
#endif /* FEATURE_PINS_HAS_ADC_INTERLEAVE_EN */
} port_mux_t;

对应配置的pin mux，普通IO口就是GPIO，模拟口就是analog。

pinLock对应lock，一般默认unlocked就行。

intConfig中断配置，要到对应的模块配置才行，不在GPIO口里面配置。

/*!* @brief Configures the interrupt generation condition.* Implements : port_interrupt_config_t_Class*/
typedef enum
{PORT_DMA_INT_DISABLED  = 0x0U,  /*!< Interrupt/DMA request is disabled.                   */PORT_DMA_RISING_EDGE   = 0x1U,  /*!< DMA request on rising edge.                          */PORT_DMA_FALLING_EDGE  = 0x2U,  /*!< DMA request on falling edge.                         */PORT_DMA_EITHER_EDGE   = 0x3U,  /*!< DMA request on either edge.                          */
#if FEATURE_PORT_HAS_FLAG_SET_ONLYPORT_FLAG_RISING_EDGE  = 0x5U,  /*!< Flag sets on rising edge, no interrupt is generated. */PORT_FLAG_FALLING_EDGE = 0x6U,  /*!< Flag sets on falling edge, no interrupt is generated.*/PORT_FLAG_EITHER_EDGE  = 0x7U,  /*!< Flag sets on either edge, no interrupt is generated. */
#endif /* FEATURE_PORT_HAS_FLAG_SET_ONLY */PORT_INT_LOGIC_ZERO    = 0x8U,  /*!< Interrupt when logic 0.                              */PORT_INT_RISING_EDGE   = 0x9U,  /*!< Interrupt on rising edge.                            */PORT_INT_FALLING_EDGE  = 0xAU,  /*!< Interrupt on falling edge.                           */PORT_INT_EITHER_EDGE   = 0xBU,  /*!< Interrupt on either edge.                            */PORT_INT_LOGIC_ONE     = 0xCU,  /*!< Interrupt when logic 1.                              */
#if FEATURE_PORT_HAS_TRIGGER_OUTPORT_HIGH_TRIGGER_OUT  = 0xDU,  /*!< Enable active high trigger output, flag is disabled. */PORT_LOW_TRIGGER_OUT   = 0xEU   /*!< Enable active low trigger output, flag is disabled.  */
#endif /* FEATURE_PORT_HAS_TRIGGER_OUT */
} port_interrupt_config_t;

clearIntFlag和digitalFilter一般也是默认就行，对应interrupt flag和digital filter。