BT_ERROR BT_RaiseSoftIRQFromISR(BT_u32 ulSoftIRQ) {
if(ulSoftIRQ < BT_CONFIG_SOFTIRQ_MAX) {
g_ulPending |= (1 << ulSoftIRQ);
BT_kMutexReleaseFromISR(g_pvMutex, NULL);
return BT_ERR_NONE;
}
return BT_ERR_GENERIC;
}
static BT_ERROR i2c_irq_handler(BT_u32 ulIRQ, void *pParam) {
BT_HANDLE hI2C = (BT_HANDLE) pParam;
BT_u32 isr_status = hI2C->pRegs->INT_STATUS;
BT_u32 avail_bytes;
BT_u32 bytes_to_recv, bytes_to_send;
BT_BOOL bRelease = BT_FALSE;
if(isr_status & INT_MASK_NACK) {
// NACK
bRelease = BT_TRUE;
}
if(isr_status & INT_MASK_ARB_LOST) {
// BUS Arbitration was lost.
bRelease = BT_TRUE;
}
if(isr_status & INT_MASK_DATA) {
if(hI2C->p_msg->len > I2C_FIFO_LEN) {
bytes_to_recv = (I2C_FIFO_LEN + 1) - hI2C->pRegs->TRANSFER_SIZE;
hI2C->p_msg->len -= bytes_to_recv;
if(hI2C->p_msg->len > I2C_FIFO_LEN) {
hI2C->pRegs->TRANSFER_SIZE = I2C_FIFO_LEN + 1;
} else {
hI2C->pRegs->TRANSFER_SIZE = hI2C->p_msg->len;
if(!hI2C->bHold) {
hI2C->pRegs->CONTROL &= CONTROL_HOLD;
}
}
while(bytes_to_recv) {
*hI2C->p_recv_buf++ = hI2C->pRegs->DATA;
bytes_to_recv--;
}
}
}
if(isr_status & INT_MASK_COMP) {
if(!hI2C->p_recv_buf) {
if(hI2C->send_count > 0) {
avail_bytes = I2C_FIFO_LEN - hI2C->pRegs->TRANSFER_SIZE;
if(hI2C->send_count > avail_bytes) {
bytes_to_send = avail_bytes;
} else {
bytes_to_send = hI2C->send_count;
}
while(bytes_to_send--) {
hI2C->pRegs->DATA = *hI2C->p_send_buf++;
hI2C->send_count--;
}
} else {
bRelease = BT_TRUE;
}
if(!hI2C->send_count) {
if(!hI2C->bHold) {
hI2C->pRegs->CONTROL &= ~CONTROL_HOLD;
}
}
} else {
if(!hI2C->bHold) {
hI2C->pRegs->CONTROL &= ~CONTROL_HOLD;
}
while(hI2C->pRegs->STATUS & STATUS_RXDV) {
*hI2C->p_recv_buf++ = hI2C->pRegs->DATA;
hI2C->recv_count--;
}
bRelease = BT_TRUE;
}
}
if(bRelease) {
BT_kMutexReleaseFromISR(hI2C->pMutex, NULL);
}
hI2C->err_status = isr_status & 0x000002EC;
hI2C->pRegs->INT_STATUS = isr_status; // Clear pending interrupts.
return BT_ERR_NONE;
}
BT_ERROR BT_ReleaseMutexFromISR(BT_HANDLE hMutex, BT_BOOL *pbHigherPriorityThreadWoken) {
return BT_kMutexReleaseFromISR(hMutex->pMutex, pbHigherPriorityThreadWoken);
}