/**
* @brief Common IRQ handler.
* @note Tries hard to clear all the pending interrupt sources, we don't
* want to go through the whole ISR and have another interrupt soon
* after.
*
* @param[in] u pointer to an UART I/O block
* @param[in] sdp communication channel associated to the UART
*/
static void serve_interrupt(SerialDriver *sdp) {
UART_TypeDef *u = sdp->uart;
uint8_t s1 = u->S1;
if (s1 & UARTx_S1_RDRF) {
osalSysLockFromISR();
if (iqIsEmptyI(&sdp->iqueue))
chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
if (iqPutI(&sdp->iqueue, u->D) < MSG_OK)
chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
osalSysUnlockFromISR();
}
if (s1 & UARTx_S1_TDRE) {
msg_t b;
osalSysLockFromISR();
b = oqGetI(&sdp->oqueue);
osalSysUnlockFromISR();
if (b < MSG_OK) {
osalSysLockFromISR();
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
osalSysUnlockFromISR();
u->C2 &= ~UARTx_C2_TIE;
} else {
u->D = b;
}
}
}
/**
* @brief Handles incoming data.
* @details This function must be called from the input interrupt service
* routine in order to enqueue incoming data and generate the
* related events.
* @note The incoming data event is only generated when the input queue
* becomes non-empty.
* @note In order to gain some performance it is suggested to not use
* this function directly but copy this code directly into the
* interrupt service routine.
*
* @param[in] sdp pointer to a @p SerialDriver structure
* @param[in] b the byte to be written in the driver's Input Queue
*
* @iclass
*/
void sdIncomingDataI(SerialDriver *sdp, uint8_t b) {
osalDbgCheckClassI();
osalDbgCheck(sdp != NULL);
if (iqIsEmptyI(&sdp->iqueue))
chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
if (iqPutI(&sdp->iqueue, b) < MSG_OK)
chnAddFlagsI(sdp, SD_QUEUE_FULL_ERROR);
}
/**
* @brief Common IRQ handler.
* @note Tries hard to clear all the pending interrupt sources, we don't
* want to go through the whole ISR and have another interrupt soon
* after.
*
* @param[in] u pointer to an UART I/O block
* @param[in] sdp communication channel associated to the UART
*/
static void serial_serve_interrupt(SerialDriver *sdp)
{
uint32_t u = sdp->uart;
uint16_t mis = HWREG(u + UART_O_MIS);
HWREG(u + UART_O_ICR) = mis; /* clear interrupts */
if (mis & (UART_MIS_FEMIS | UART_MIS_PEMIS | UART_MIS_BEMIS | UART_MIS_OEMIS)) {
set_error(sdp, mis);
}
if ((mis & UART_MIS_RXMIS) || (mis & UART_MIS_RTMIS)) {
osalSysLockFromISR();
if (iqIsEmptyI(&sdp->iqueue)) {
chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
}
osalSysUnlockFromISR();
while ((HWREG(u + UART_O_FR) & UART_FR_RXFE) == 0) {
osalSysLockFromISR();
if (iqPutI(&sdp->iqueue, HWREG(u + UART_O_DR)) < Q_OK) {
chnAddFlagsI(sdp, SD_QUEUE_FULL_ERROR);
}
osalSysUnlockFromISR();
}
}
if (mis & UART_MIS_TXMIS) {
while ((HWREG(u + UART_O_FR) & UART_FR_TXFF) == 0) {
msg_t b;
osalSysLockFromISR();
b = oqGetI(&sdp->oqueue);
osalSysUnlockFromISR();
if (b < Q_OK) {
HWREG(u + UART_O_IM) &= ~UART_IM_TXIM;
osalSysLockFromISR();
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
osalSysUnlockFromISR();
break;
}
HWREG(u + UART_O_DR) = b;
}
}
/* TODO: Physical transmission end. */
}
/* Common function for all DMA-UART IRQ handlers. */
static void tsCopyDataFromDMA() {
chSysLockFromISR();
// get 0-based DMA buffer position
int dmaPos = TS_DMA_BUFFER_SIZE - dmaStreamGetTransactionSize(TS_DMA_UART_DEVICE->dmarx);
// if the position is wrapped (circular DMA-mode enabled)
if (dmaPos < tsUartDma.readPos)
dmaPos += TS_DMA_BUFFER_SIZE;
// we need to update the current readPos
int newReadPos = tsUartDma.readPos;
for (int i = newReadPos; i < dmaPos; ) {
if (iqPutI(&tsUartDma.fifoRxQueue, tsUartDma.dmaBuffer[newReadPos]) != Q_OK) {
break; // todo: ignore overflow?
}
// the read position should always stay inside the buffer range
newReadPos = (++i) & (TS_DMA_BUFFER_SIZE - 1);
}
tsUartDma.readPos = newReadPos;
chSysUnlockFromISR();
}
/**
* @brief Common IRQ handler.
* @note Tries hard to clear all the pending interrupt sources, we don't
* want to go through the whole ISR and have another interrupt soon
* after.
*
* @param[in] u pointer to an UART I/O block
* @param[in] sdp communication channel associated to the UART
*/
static void serial_serve_interrupt(SerialDriver *sdp)
{
UART_TypeDef *u = sdp->uart;
uint16_t mis = u->MIS;
u->ICR = mis; /* clear interrupts */
if (mis & (TIVA_MIS_FEMIS | TIVA_MIS_PEMIS | TIVA_MIS_BEMIS | TIVA_MIS_OEMIS)) {
set_error(sdp, mis);
}
if ((mis & TIVA_MIS_RXMIS) || (mis & TIVA_MIS_RTMIS)) {
osalSysLockFromISR();
if (iqIsEmptyI(&sdp->iqueue)) {
chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
}
osalSysUnlockFromISR();
while ((u->FR & TIVA_FR_RXFE) == 0) {
osalSysLockFromISR();
if (iqPutI(&sdp->iqueue, u->DR) < Q_OK) {
chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
}
osalSysUnlockFromISR();
}
}
if (mis & TIVA_MIS_TXMIS) {
while ((u->FR & TIVA_FR_TXFF) == 0) {
msg_t b;
osalSysLockFromISR();
b = oqGetI(&sdp->oqueue);
osalSysUnlockFromISR();
if (b < Q_OK) {
u->IM &= ~TIVA_IM_TXIM;
osalSysLockFromISR();
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
osalSysUnlockFromISR();
break;
}
u->DR = b;
}
}
}