the difference between an embOS interrupt and a zero latency interrupt is the interrupt priority level and the usage of OS_EnterInterrupt()/OS_LeaveInterrupt() or OS_EnterNestableInterrupt()/OS_LeaveNestableInterrupt().
Example of an embOS interrupt function:
void OS_COM_IsrHandler(void) { int Dummy; OS_EnterNestableInterrupt(); Dummy = US_RHR; // Call embOS API functions here OS_LeaveNestableInterrupt(); } void Uart_Init(void) { OS_ARM_InstallISRHandler(ISR_ID_USART, (OS_ISR_HANDLER*) OS_COM_IsrHandler); OS_ARM_ISRSetPrio(140); // Set prio > 128 OS_ARM_EnableISR(ISR_ID_USART); }
Example of a zero latency interrupt function:
void OS_COM_IsrHandler(void) { int Dummy; Dummy = US_RHR; // Never call embOS API functions here } void Uart_Init(void) { OS_ARM_InstallISRHandler(ISR_ID_USART, (OS_ISR_HANDLER*) OS_COM_IsrHandler); OS_ARM_ISRSetPrio(120); // Set prio < 128 OS_ARM_EnableISR(ISR_ID_USART); }
the difference between an embOS interrupt and a zero latency interrupt
原文：http://www.cnblogs.com/shangdawei/p/4626721.html