/**
* @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;
}
