当进入suspense,进入deep sleep。软件模块使用GPIO需要put GPIO进入sleep state以减少电流泄露。 Linux Pin Control Overview MSM8916/MSM8939系列新品有122个GPIOs GPIO pin能够配置作为输入、输出或者其他功能。当作为输入时,GPIO设置为interrupt 资源。一个GPIOs子集能够产生中断,能够将msm deep sleep唤醒。GPIO也能够配...
<&pmucruPCLK_I2C4_PMU>;clock-names="i2c","pclk";interrupts=<GIC_SPI56IRQ_TYPE_LEVEL_HIGH0>;pinctrl-names="default","gpio";pinctrl-0=<&i2c4_xfer>;pinctrl-1=<&i2c4_gpio>;//此处源码未添加#address-cells = <1>;#size-cells = <0>;status="disabled...
sruct gpio_desc *gpiod_get(structdevice *dev,char*con_id,enumgpiod_flags flags);voidgpiod_put(sruct gpio_desc *desc);//使用示例:structgpio_desc*red, *green, *blue, *power, *reset;red = gpiod_get_index(dev,"led",0, GPIO_OUT_HIGH); green = gpiod_get_index(dev,"led",1, G...
sun50iw9p1-pinctrl";//兼容属性,用于驱动和设备绑定reg=<0x00x0300b0000x00x400>;//寄存器基地址0x0300b000和范围0x400interrupts=<GIC_SPI51IRQ_TYPE_LEVEL_HIGH>,/* AW1823_GIC_Spec: GPIOA: 83-32=51 */<GIC_SPI52IRQ_TYPE
voidHAL_GPIO_TogglePin(GPIO_TypeDef*GPIOx,uint16_t GPIO_Pin){uint32_t odr;/* Check the parameters */assert_param(IS_GPIO_PIN(GPIO_Pin));/* get current Ouput Data Register value */odr=GPIOx->ODR;/* Set selected pins that were at low level, and reset ones that were high */GPIO...
(1<<3); //led off } /* write 1 to clear GPIO5_IO03 interrput status*/ GPIO5->ISR |= (1 << 1); } void key_gpio4_handle_irq(void) { /* read GPIO4_DR to get GPIO4_IO014 status*/ if((GPIO4->DR >> 14 ) & 0x1) printf("key 2 is release\r\n"); else printf("...
0:1; gpio_direction_output(gpio_info->firefly_gpio, gpio_info->gpio_enable_value); printk("Firefly gpio putout\n"); ... } of_get_named_gpio_flags 从设备树中读取 firefly-gpio 和firefly-irq-gpio 的GPIO 配置编号和标志,gpio_is_valid 判断该 GPIO 编号是否有效,gpio_request 则申请占用该 ...
devm_gpiod_put_array 前缀为"devm_"的含义是设备资源管理,这是一种自动释放资源的机制。它的思想是“资源是属于设备的,设备不存在时资源就可以自动释放”。在Linux驱动开发过程中,先申请了GPIO,再申请内存,如果内存申请失败,那么在返回之前就需要先释放GPIO资源。如果使用的是devm相关函数,在内存申请失败时可以直接...
voidHAL_GPIO_TogglePin(GPIO_TypeDef*GPIOx,uint16_t GPIO_Pin){uint32_t odr;/* Check the parameters */assert_param(IS_GPIO_PIN(GPIO_Pin));/* get current Ouput Data Register value */odr=GPIOx->ODR;/* Set selected pins that were at low level, and reset ones that were high */GPIO...
(chip, gpio - chip->base); spin_lock_irqsave(&gpio_lock, flags); if (status < 0) { desc_set_label(desc, NULL); module_put(chip->owner); clear_bit(FLAG_REQUESTED, &desc->flags); } } done: if (status) pr_debug("gpio_request: gpio-%d (%s) status %d\n", gpio, label ?