ch551加spiflash是否可以实现模拟u盘功能,例程只用ch554读取u盘功能,没有找到模拟u盘,有没有参考例程
编译信息如下,请问该如何修改代码或者库文件?Rebuild target 'STM32F103C8x'compiling main.c...compiling gpio.c...compiling tim.c...compiling usart.c...compiling stm32f1xx_it.c...compiling stm32f1xx_hal_msp.c...compiling gizwits_product.c...compiling gizwits_protocol.c.....\Gizwits\gizwits_protocol.c(185): warning: #550-D: variable "lastReportTime" was set but never used static uint32_t lastReportTime = 0;..\Gizwits\gizwits_protocol.c(186): warning: #550-D: variable "currentTime" was set but never used uint32_t currentTime = 0;..\Gizwits\gizwits_protocol.c: 2 warnings 0 errorscompiling hal_key.c...compiling common.c...compiling dataPointTools.c...compiling ringbuffer.c...compiling stm32f1xx_hal_gpio_ex.c...compiling stm32f1xx_hal_tim.c...compiling stm32f1xx_hal_tim_ex.c...compiling stm32f1xx_hal.c...compiling stm32f1xx_hal_rcc.c...compiling stm32f1xx_hal_rcc_ex.c...compiling stm32f1xx_hal_gpio.c...compiling stm32f1xx_hal_dma.c...compiling stm32f1xx_hal_cortex.c...compiling stm32f1xx_hal_pwr.c...compiling stm32f1xx_hal_flash.c...compiling stm32f1xx_hal_flash_ex.c...compiling stm32f1xx_hal_exti.c...compiling stm32f1xx_hal_uart.c...assembling startup_stm32f10x_md.s...compiling system_stm32f10x.c...linking....\STM32F103C8x\STM32F103C8x.axf: Error: L6218E: Undefined symbol APBPrescTable (referred from stm32f1xx_hal_rcc.o).Not enough information to list image symbols.Finished: 1 information 0 warning and 1 error messages.".\STM32F103C8x\STM32F103C8x.axf" - 1 Error(s) 2 Warning(s).Target not created.Build Time Elapsed: 00:00:28相对应代码如下:stm32f1xx_hal_rcc.c53 extern const uint8_t APBPrescTable[8U]; /@@*!< APB prescalers table values */1190 return (HAL_RCC_GetHCLKFreq() >> APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE1) >> RCC_CFGR_PPRE1_Pos]);1202 return (HAL_RCC_GetHCLKFreq() >> APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE2) >> RCC_CFGR_PPRE2_Pos]);
PWM不是通过改变输出时间来控制LED亮度的吗?但是我用PWM模块接恒流驱动电源再接LED却发现改变PWM占空比并不能调节LED亮度,但是如果PWM模块串联分压电阻直连LED时,就能通过改变占空比改变LED亮度,但是此时通过LED的电流却又很小只有0.0几A,请问是不是恒流驱动电源不能使用PWM吗?应该换恒压驱动电源吗?
手册上写一个周期只要10ms,另外一个要10ms,我看写入格式都一样,为什么时间差那么多
保险丝管:型号AGC-1/10-R、AGC-14-R是否有国产平替型号
1、UART 转 2322、UART 转 4223、UART 转 232/422可配置4、USB 转 UART5、PHY芯片6、CAN驱动芯片7、低边开关(OD_OUT)8、光耦器件(OD_IN)9、GNSS定位模块10、传感器(IMU、气压计、差压空速计、磁传感器)以上功能芯片。大家知道哪些能转国产替代料。知道的回答一下,谢谢
发光管OP233W 以前用的TT的,韩国KODENSHI KOREA CORP的硅光电池PN-K6IHP-SH 想找两款国产器件做国产化替换掉,麻烦各位大神给推荐一下呢!十分感谢