Posted on June 16, 2014 at 10:01Hi, I work with STM32L1 and use the USB in VCP.
The firmware work
perfectly
.
I use the library ''STM32_USB-FS-Device_Lib_V4.0.0''
and I use the example firmware ''VirtualComport_Loopback''
The usb work!. but I need
completely disable
the USB
and go to
''STOP mode''.
The problem is that
once activated
USB
, I can not
turn it off
completely
and when go in ''STOP mode'' the STM32
consumes power
(~600uA) but if not inizialize USB the STM32
consumes power
(~3uA)!
I inizialize USB:
Set_System();
Set_USBClock();
USB_Interrupts_Config();
USB_Init();
and when de-inizialize USB :
EXTI_ClearITPendingBit(EXTI_Line18);
EXTI_InitStructure.EXTI_Line = EXTI_Line18;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = DISABLE;
EXTI_Init(&EXTI_InitStructure);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, DISABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, DISABLE);
NVIC_InitTypeDef NVIC_InitStructure;
/* 2 bit for pre-emption priority, 2 bits for subpriority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
/* Enable the USB interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USB_LP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the USB Wake-up interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USB_FS_WKUP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
NVIC_Init(&NVIC_InitStructure);
PowerOff();
But the USB is NOT deinizialize completely!, How I do deinizialize?
