/**
* Initializes all receive related tasks and synchronization primitives.
* This function must be called before anything is attempted to be received!
*
* @param uart_nr - number of the UART
*
* @return pdPASS if initialization is successful, pdFAIL otherwise
*/
int16_t recvInit(uint8_t uart_nr)
{
/* Obtain the UART's IRQ from BSP */
const uint8_t uartIrqs[BSP_NR_UARTS] = BSP_UART_IRQS;
const uint8_t irq = ( uart_nr<BSP_NR_UARTS ?
uartIrqs[uart_nr] :
(uint8_t) -1 );
uint16_t i;
for ( i=0; i<RECV_BUFFER_SIZE; ++i )
{
memset((void*) buf[i], '\0', RECV_TOTAL_BUFFER_LEN);
strcpy(buf[i], MSG_TEXT);
}
bufCntr = 0;
bufPos = 0;
/* Check if UART number is valid */
if ( uart_nr >= BSP_NR_UARTS )
{
return pdFAIL;
}
recvUartNr = uart_nr;
/* Create and assert a queue for received characters */
recvQueue = xQueueCreate(RECV_QUEUE_SIZE, sizeof(portCHAR));
if ( 0 == recvQueue )
{
return pdFAIL;
}
/* Attempt to register UART's IRQ on VIC */
if ( pic_registerIrq(irq, &recvIsrHandler, 50) < 0 )
{
return pdFAIL;
}
/* Enable the UART's IRQ on VIC */
pic_enableInterrupt(irq);
/* Configure the UART to receive data and trigger interrupts on receive */
uart_enableRx(recvUartNr);
uart_enableRxInterrupt(recvUartNr);
return pdPASS;
}
/*
* Setup the timer 0 and the VIC
*/
static void prvSetupTimerInterrupt( void )
{
/*
* If timer settings are inappropriate (portTICK_TIMER>=BSP_NR_TIMERS), this
* file will not compile. Thus an invalid timer's IRQ (something read from
* a "random" location) will be prevented.
*/
#if portTICK_TIMER >= BSP_NR_TIMERS
#error Invalid timer selected!
#endif
uint32_t ulCompareMatch;
const uint8_t irqs[BSP_NR_TIMERS] = BSP_TIMER_IRQS;
const uint8_t irq = irqs[portTICK_TIMER];
extern void vTickISR(void);
/* Calculate the match value required for our desired tick rate. */
ulCompareMatch = ( 0 != configTICK_RATE_HZ ?
configCPU_CLOCK_HZ / configTICK_RATE_HZ :
(uint32_t) (-1) );
/* Counter's load should always be greater than 0 */
if ( 0 == ulCompareMatch )
{
ulCompareMatch = 1;
}
/* Configure the timer 0, counter 0 */
timer_init(portTICK_TIMER, portTICK_TIMER_COUNTER);
timer_setLoad(portTICK_TIMER, portTICK_TIMER_COUNTER, ulCompareMatch);
timer_enableInterrupt(portTICK_TIMER, portTICK_TIMER_COUNTER);
/* Configure the VIC to service IRQ4 (triggered by the timer) properly */
pic_registerIrq(irq, &vTickISR, PIC_MAX_PRIORITY);
/* Enable servicing of IRQ4 */
pic_enableInterrupt(irq);
/*
* Start the timer.
* Note that IRQ mode will only be enabled when the first FreeRTOS task starts.
*/
timer_start(portTICK_TIMER, portTICK_TIMER_COUNTER);
}
