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QT如何在QStackedWidget的子页面画线
- 2019-09-20
按以下代码写，运行时报错：QWidget::paintEngine: Should no longer be calledQPainter::begin: Paint device returned engine == 0 type: 1QPainter::setPen: Painter not active QPainter p1(ui->stackedWidget->widget(2)); QPen pen; pen.setWidth(3); pen.setColor(Qt::blue); p1.setPen(pen); for (int i = 0; i < 5; i++) p1.drawLine(5 20 + i * 40 380 20 + i * 40);
linux下的基于adc框架的驱动编写问题
- 2019-01-18
adc框架大概是个什么样的，这个框架下的驱动该怎么写。网上搜到的都是misc总线，在学习阶段我还是想把ad驱动基于这个框架来实现。下边是我写的一段代码，但我注册就会kern panic，说是不能注册同名驱动static struct resource adc_resource[] = { [0] = { .start = 0xB800A000 .end = 0xB800A000 + 0x2C - 1 .flags = IORESOURCE_MEM } [1] = { .start = IRQ_ADC .end = IRQ_ADC .flags = IORESOURCE_IRQ } }; static void adc_release(struct device *dev) { } static struct platform_device adc_dev = { .name = "nuc970-nadc" .id = -1 .num_resources = ARRAY_SIZE(adc_resource) .resource = adc_resource .dev = { .release = adc_release } }; static int __init adc_init(void) { return platform_device_register(&adc_dev); } static void __exit adc_exit(void) { platform_device_unregister(&adc_dev); }
