/******************************************************************************* * @fn bspI2cInit * * @brief Initialize the RTOS I2C driver (must be called only once) * * @param none * * @return none */ void bspI2cInit(void) { Semaphore_Params semParamsMutex; // Create protection semaphore Semaphore_Params_init(&semParamsMutex); semParamsMutex.mode = Semaphore_Mode_BINARY; Semaphore_construct(&mutex, 1, &semParamsMutex); // Reset the I2C controller HapiResetPeripheral(PRCM_PERIPH_I2C0); I2C_init(); I2C_Params_init(&i2cParams); i2cParams.bitRate = I2C_400kHz; i2cHandle = I2C_open(Board_I2C, &i2cParams); // Initialize local variables slaveAddr = 0xFF; interface = BSP_I2C_INTERFACE_0; if (i2cHandle == NULL) { Task_exit(); } }
/******************************************************************************* * @fn bspI2cReset * * @brief Reset the RTOS I2C driver * * @param none * * @return none */ void bspI2cReset(void) { // Acquire I2C resource */ if (!Semaphore_pend(Semaphore_handle(&mutex),MS_2_TICKS(I2C_TIMEOUT))) { return; } // Close the driver I2C_close(i2cHandle); // Reset the I2C controller HapiResetPeripheral(PRCM_PERIPH_I2C0); // Reset local variables slaveAddr = 0xFF; interface = BSP_I2C_INTERFACE_0; // Open driver i2cHandle = I2C_open(Board_I2C, &i2cParams); // Release I2C resource Semaphore_post(Semaphore_handle(&mutex)); }
/*! * @brief Function that cancels a SPI transfer. Will disable SPI and UDMA modules * and allow standby. * * @pre SPICC26XXDMA_open() has to be called first. * Calling context: Task * * @param handle The SPI_Handle for ongoing transaction. */ void SPICC26XXDMA_transferCancel(SPI_Handle handle) { SPICC26XX_Object *object; SPI_Transaction *msg; SPICC26XX_HWAttrs const *hwAttrs; volatile tDMAControlTable *dmaControlTableEntry; unsigned int key; /* Get the pointer to the object and hwAttrs */ object = handle->object; hwAttrs = handle->hwAttrs; /* Check if a transfer is in progress */ key = Hwi_disable(); /* Check if there is an active transaction */ if(!(object->currentTransaction)) { Hwi_restore(key); return; } Hwi_restore(key); /* Disable the SPI module */ SSIDisable(hwAttrs->baseAddr); /* Disable SPI TX/RX DMA and clear DMA done interrupt just in case it finished */ SSIDMADisable(hwAttrs->baseAddr, SSI_DMA_TX | SSI_DMA_RX); UDMACC26XX_clearInterrupt(object->udmaHandle, (hwAttrs->rxChannelBitMask) | (hwAttrs->txChannelBitMask)); /* Disable and clear any pending interrupts */ SSIIntDisable(hwAttrs->baseAddr, SSI_RXOR); SSIIntClear(hwAttrs->baseAddr, SSI_RXOR); /* Clear out the FIFO by resetting SPI module and re-initting */ HapiResetPeripheral(hwAttrs->baseAddr == SSI0_BASE ? PRCM_PERIPH_SSI0 : PRCM_PERIPH_SSI1); SPICC26XXDMA_initHw(handle); /* Release constraint since transaction is done */ threadSafeConstraintRelease((uint32_t)(object->currentTransaction->txBuf)); /* Mark the transaction as failed if we didn't end up here due to a CSN deassertion */ if (object->currentTransaction->status != SPI_TRANSFER_CSN_DEASSERT) { object->currentTransaction->status = SPI_TRANSFER_FAILED; } /* Disable the UDMA channels */ UDMACC26XX_channelDisable(object->udmaHandle, (hwAttrs->rxChannelBitMask) | (hwAttrs->txChannelBitMask)); /* Update the SPI_Transaction.count parameter */ /* rxChannel always finishes after txChannel so remaining bytes of the rxChannel is used to update count */ dmaControlTableEntry = (hwAttrs->baseAddr == SSI0_BASE ? &dmaRxControlTableEntry0 : &dmaRxControlTableEntry1); object->currentTransaction->count -= UDMACC26XX_GET_TRANSFER_SIZE(dmaControlTableEntry->ui32Control); /* Use a temporary transaction pointer in case the callback function * attempts to perform another SPI_transfer call */ msg = object->currentTransaction; /* Indicate we are done with this transfer */ object->currentTransaction = NULL; Log_print2(Diags_USER1,"SPI:(%p) DMA transaction: %p cancelled", hwAttrs->baseAddr, (UArg)msg); /* Perform callback */ object->transferCallbackFxn(handle, msg); /* Transaction was successfully canceled */ return; }
/* * ======== SPICC26XXDMA_hwiFxn ======== * ISR for the SPI when we use the UDMA */ static void SPICC26XXDMA_hwiFxn (UArg arg) { SPI_Transaction *msg; SPICC26XX_Object *object; SPICC26XX_HWAttrs const *hwAttrs; uint32_t intStatus; /* Get the pointer to the object and hwAttrs */ object = ((SPI_Handle)arg)->object; hwAttrs = ((SPI_Handle)arg)->hwAttrs; Log_print1(Diags_USER2, "SPI:(%p) interrupt context start", hwAttrs->baseAddr); /* Get the interrupt status of the SPI controller */ intStatus = SSIIntStatus(hwAttrs->baseAddr, true); SSIIntClear(hwAttrs->baseAddr, intStatus); /* Error handling: * Overrun in the RX Fifo -> at least one sample in the shift * register has been discarded */ if (intStatus & SSI_RXOR) { /* disable the interrupt */ SSIIntDisable(hwAttrs->baseAddr, SSI_RXOR); /* If the RX overrun occurred during a transfer */ if (object->currentTransaction) { /* Then cancel the ongoing transfer */ SPICC26XXDMA_transferCancel((SPI_Handle)arg); } else { /* Otherwise disable the SPI and DMA modules and flush FIFOs */ SSIDisable(hwAttrs->baseAddr); /* Disable SPI TX/RX DMA and clear DMA done interrupt just in case it finished */ SSIDMADisable(hwAttrs->baseAddr, SSI_DMA_TX | SSI_DMA_RX); UDMACC26XX_clearInterrupt(object->udmaHandle, (hwAttrs->rxChannelBitMask) | (hwAttrs->txChannelBitMask)); /* Clear out the FIFO by resetting SPI module and re-initting */ HapiResetPeripheral(hwAttrs->baseAddr == SSI0_BASE ? PRCM_PERIPH_SSI0 : PRCM_PERIPH_SSI1); SPICC26XXDMA_initHw((SPI_Handle)arg); } Log_print1(Diags_USER1, "RX FIFO overrun occurred in SPI: (%p) !\n", hwAttrs->baseAddr); } else { /* Determine if the TX DMA channel has completed... */ if (UDMACC26XX_channelDone(object->udmaHandle, hwAttrs->txChannelBitMask)) { /* Disable SPI TX DMA and clear DMA done interrupt. */ SSIDMADisable(hwAttrs->baseAddr, SSI_DMA_TX); UDMACC26XX_clearInterrupt(object->udmaHandle, hwAttrs->txChannelBitMask); /* All transfers will set up both TX and RX DMA channels and both will finish. * Even if the transaction->rxBuf == NULL, it will setup a dummy RX transfer to * a scratch memory location which is then discarded. * Therefore all cleanup is only done when the RX DMA channel has completed, * since it will always run at some point after the TX DMA channel has completed. */ } /* Determine if the RX DMA channel has completed... */ if(UDMACC26XX_channelDone(object->udmaHandle, hwAttrs->rxChannelBitMask)) { /* Disable SPI RX DMA and clear DMA done interrupt. */ SSIDMADisable(hwAttrs->baseAddr, SSI_DMA_RX); UDMACC26XX_clearInterrupt(object->udmaHandle, hwAttrs->rxChannelBitMask); /* Transaction is complete */ object->currentTransaction->status = SPI_TRANSFER_COMPLETED; /* Use a temporary transaction pointer in case the callback function * attempts to perform another SPI_transfer call */ msg = object->currentTransaction; Log_print2(Diags_USER1,"SPI:(%p) DMA transaction: %p complete", hwAttrs->baseAddr, (UArg)msg); /* Release constraint since transaction is done */ threadSafeConstraintRelease((uint32_t)(object->currentTransaction->txBuf)); /* Indicate we are done with this transfer */ object->currentTransaction = NULL; /* Perform callback */ object->transferCallbackFxn((SPI_Handle)arg, msg); } } Log_print1(Diags_USER2, "SPI:(%p) interrupt context end", hwAttrs->baseAddr); }