/** * @brief Handle interrupt from mailbox * @return Nothing */ void MAILBOX_IRQHandler(void) { /* Slave core uses passed mailbox value as address to shared LED state values */ uint32_t *psharedLEDStates = (uint32_t *) Chip_MBOX_GetValue(LPC_MBOX, myCoreBox); /* Toggle LED bit state for this core usign mutex */ mutexTake(); sharedLEDStates = *psharedLEDStates; ledToggleBit(1); *psharedLEDStates = sharedLEDStates; mutexGive(); /* Clear this MCU's mailbox */ Chip_MBOX_ClearValueBits(LPC_MBOX, myCoreBox, 0xFFFFFFFF); /* Signal master code about the change */ Chip_MBOX_SetValue(LPC_MBOX, otherCoreBox, 1); }
int main(void) { #if defined (__USE_LPCOPEN) // Read clock settings and update SystemCoreClock variable SystemCoreClockUpdate(); #if !defined(NO_BOARD_LIB) #if defined (__MULTICORE_MASTER) || defined (__MULTICORE_NONE) // Set up and initialize all required blocks and // functions related to the board hardware Board_Init(); #endif // Set the LED to the state of "On" Board_LED_Set(0, true); #endif #endif #if defined (__MULTICORE_MASTER_SLAVE_M0SLAVE) || \ defined (__MULTICORE_MASTER_SLAVE_M4SLAVE) boot_multicore_slave(); #endif // Get the address of the PCM value FIFO from the M4 master. PCM_FIFO = (PCM_FIFO_T *) Chip_MBOX_GetValue(LPC_MBOX, MAILBOX_CM0PLUS); // Map P0.21 as the CLKOUT pin. Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 21, (IOCON_FUNC1 | IOCON_MODE_INACT | IOCON_DIGITAL_EN)); // Route the main clock to the CLKOUT pin, for a 1 MHz signal. Chip_Clock_SetCLKOUTSource(SYSCON_CLKOUTSRC_MAINCLK, SystemCoreClock / 1000000); // Enable the GPIO and pin-interrupt sub-systems. Chip_GPIO_Init(LPC_GPIO); Chip_PININT_Init(LPC_PININT); // Map PIO0_9 as a GPIO input pin. This is the data signal from the // microphone. Chip_GPIO_SetPinDIRInput(LPC_GPIO, 0, 9); Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 9, (IOCON_FUNC0 | IOCON_DIGITAL_EN | IOCON_GPIO_MODE)); // Map PIO0_11 as a GPIO input pin, triggering pin-interrupt 0. This will // indicate that there is a sample ready from the microphone. Chip_GPIO_SetPinDIRInput(LPC_GPIO, 0, 11); Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 11, (IOCON_FUNC0 | IOCON_DIGITAL_EN | IOCON_GPIO_MODE)); Chip_INMUX_PinIntSel(PININTSELECT0, 0, 11); // Trigger the interrupt on the clock's rising edge. Chip_PININT_ClearIntStatus(LPC_PININT, PININTCH(PININTSELECT0)); Chip_PININT_SetPinModeEdge(LPC_PININT, PININTCH(PININTSELECT0)); Chip_PININT_EnableIntHigh(LPC_PININT, PININTCH(PININTSELECT0)); // Enable the interrupt in the NVIC. NVIC_EnableIRQ(PIN_INT0_IRQn); // Spin while waiting for interrupts from the microphone. while (1) { __WFI(); } return 0; }