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PX4-Autopilot/libuavcan_drivers/stm32/driver/src/uc_stm32_can.cpp
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/*
* Copyright (C) 2014 Pavel Kirienko <pavel.kirienko@gmail.com>
*/
#include <cassert>
#include <cstring>
#include <uavcan_stm32/can.hpp>
#include <uavcan_stm32/clock.hpp>
#include "internal.hpp"
#if UAVCAN_STM32_CHIBIOS
# include <hal.h>
#elif UAVCAN_STM32_NUTTX
# include <nuttx/arch.h>
# include <nuttx/irq.h>
# include <arch/board/board.h>
#else
# error "Unknown OS"
#endif
#if !UAVCAN_STM32_NUTTX
# if !(defined(STM32F10X_CL) || defined(STM32F2XX) || defined(STM32F4XX))
// IRQ numbers
# define CAN1_RX0_IRQn USB_LP_CAN1_RX0_IRQn
# define CAN1_TX_IRQn USB_HP_CAN1_TX_IRQn
// IRQ vectors
# if !defined(CAN1_RX0_IRQHandler) || !defined(CAN1_TX_IRQHandler)
# define CAN1_TX_IRQHandler USB_HP_CAN1_TX_IRQHandler
# define CAN1_RX0_IRQHandler USB_LP_CAN1_RX0_IRQHandler
# endif
# endif
#endif
#if UAVCAN_STM32_NUTTX
# if !defined(STM32_IRQ_CAN1TX) && !defined(STM32_IRQ_CAN1RX0)
# define STM32_IRQ_CAN1TX STM32_IRQ_USBHPCANTX
# define STM32_IRQ_CAN1RX0 STM32_IRQ_USBLPCANRX0
# endif
extern "C"
{
static int can1_irq(const int irq, void*);
#if UAVCAN_STM32_NUM_IFACES > 1
static int can2_irq(const int irq, void*);
#endif
}
#endif
namespace uavcan_stm32
{
namespace
{
CanIface* ifaces[UAVCAN_STM32_NUM_IFACES] =
{
NULL
#if UAVCAN_STM32_NUM_IFACES > 1
, NULL
#endif
};
inline void handleTxInterrupt(uavcan::uint8_t iface_index)
{
UAVCAN_ASSERT(iface_index < UAVCAN_STM32_NUM_IFACES);
uavcan::uint64_t utc_usec = clock::getUtcUSecFromCanInterrupt();
if (utc_usec > 0)
{
utc_usec--;
}
if (ifaces[iface_index] != NULL)
{
ifaces[iface_index]->handleTxInterrupt(utc_usec);
}
else
{
UAVCAN_ASSERT(0);
}
}
inline void handleRxInterrupt(uavcan::uint8_t iface_index, uavcan::uint8_t fifo_index)
{
UAVCAN_ASSERT(iface_index < UAVCAN_STM32_NUM_IFACES);
uavcan::uint64_t utc_usec = clock::getUtcUSecFromCanInterrupt();
if (utc_usec > 0)
{
utc_usec--;
}
if (ifaces[iface_index] != NULL)
{
ifaces[iface_index]->handleRxInterrupt(fifo_index, utc_usec);
}
else
{
UAVCAN_ASSERT(0);
}
}
} // namespace
/*
* CanIface::RxQueue
*/
void CanIface::RxQueue::registerOverflow()
{
if (overflow_cnt_ < 0xFFFFFFFF)
{
overflow_cnt_++;
}
}
void CanIface::RxQueue::push(const uavcan::CanFrame& frame, const uint64_t& utc_usec, uavcan::CanIOFlags flags)
{
buf_[in_].frame = frame;
buf_[in_].utc_usec = utc_usec;
buf_[in_].flags = flags;
in_++;
if (in_ >= capacity_)
{
in_ = 0;
}
len_++;
if (len_ > capacity_)
{
len_ = capacity_;
registerOverflow();
out_++;
if (out_ >= capacity_)
{
out_ = 0;
}
}
}
void CanIface::RxQueue::pop(uavcan::CanFrame& out_frame, uavcan::uint64_t& out_utc_usec, uavcan::CanIOFlags& out_flags)
{
if (len_ > 0)
{
out_frame = buf_[out_].frame;
out_utc_usec = buf_[out_].utc_usec;
out_flags = buf_[out_].flags;
out_++;
if (out_ >= capacity_)
{
out_ = 0;
}
len_--;
}
else { UAVCAN_ASSERT(0); }
}
/*
* CanIface
*/
int CanIface::computeTimings(const uavcan::uint32_t target_bitrate, Timings& out_timings)
{
/*
* BITRATE = 1 / (PRESCALER * (1 / PCLK) * (1 + BS1 + BS2))
* BITRATE = PCLK / (PRESCALER * (1 + BS1 + BS2))
* let:
* BS = 1 + BS1 + BS2
* PRESCALER_BS = PRESCALER * BS
* ==>
* PRESCALER_BS = PCLK / BITRATE
*/
if (target_bitrate < 20000 || target_bitrate > 1000000)
{
return -1;
}
#if UAVCAN_STM32_CHIBIOS
const uavcan::uint32_t pclk = STM32_PCLK1;
#elif UAVCAN_STM32_NUTTX
const uavcan::uint32_t pclk = STM32_PCLK1_FREQUENCY;
#else
# error "Unknown OS"
#endif
const uavcan::uint32_t prescaler_bs = pclk / target_bitrate;
// Initial guess:
uavcan::int8_t bs1 = 10; // max 15
uavcan::int8_t bs2 = 5; // max 8
uavcan::uint16_t prescaler = 0;
while (1)
{
prescaler = uavcan::uint16_t(prescaler_bs / unsigned(1 + bs1 + bs2));
// Check result:
if ((prescaler >= 1) && (prescaler <= 1024))
{
const uavcan::uint32_t current_bitrate = pclk / (prescaler * unsigned(1 + bs1 + bs2));
if (current_bitrate == target_bitrate)
{
break;
}
}
if (bs1 > bs2)
{
bs1--;
}
else
{
bs2--;
}
if (bs1 <= 0 || bs2 <= 0)
{
return -1;
}
}
if (!((prescaler >= 1) && (prescaler <= 1024)))
{
return -1;
}
out_timings.prescaler = uavcan::uint16_t(prescaler - 1U);
out_timings.sjw = 1;
out_timings.bs1 = uavcan::uint8_t(bs1 - 1);
out_timings.bs2 = uavcan::uint8_t(bs2 - 1);
return 0;
}
uavcan::int16_t CanIface::send(const uavcan::CanFrame& frame, uavcan::MonotonicTime tx_deadline,
uavcan::CanIOFlags flags)
{
if (frame.isErrorFrame() || frame.dlc > 8)
{
return -1; // WTF man how to handle that
}
CriticalSectionLocker lock;
/*
* Seeking for an empty slot
*/
uavcan::uint8_t txmailbox = 0xFF;
if ((can_->TSR & bxcan::TSR_TME0) == bxcan::TSR_TME0)
{
txmailbox = 0;
}
else if ((can_->TSR & bxcan::TSR_TME1) == bxcan::TSR_TME1)
{
txmailbox = 1;
}
else if ((can_->TSR & bxcan::TSR_TME2) == bxcan::TSR_TME2)
{
txmailbox = 2;
}
else { return 0; } // No way
/*
* Setting up the mailbox
*/
bxcan::TxMailboxType& mb = can_->TxMailbox[txmailbox];
if (frame.isExtended())
{
mb.TIR = ((frame.id & uavcan::CanFrame::MaskExtID) << 3) | bxcan::TIR_IDE;
}
else
{
mb.TIR = ((frame.id & uavcan::CanFrame::MaskStdID) << 21);
}
if (frame.isRemoteTransmissionRequest())
{
mb.TIR |= bxcan::TIR_RTR;
}
mb.TDTR = frame.dlc;
mb.TDHR = (uavcan::uint32_t(frame.data[7]) << 24) |
(uavcan::uint32_t(frame.data[6]) << 16) |
(uavcan::uint32_t(frame.data[5]) << 8) |
(uavcan::uint32_t(frame.data[4]) << 0);
mb.TDLR = (uavcan::uint32_t(frame.data[3]) << 24) |
(uavcan::uint32_t(frame.data[2]) << 16) |
(uavcan::uint32_t(frame.data[1]) << 8) |
(uavcan::uint32_t(frame.data[0]) << 0);
mb.TIR |= bxcan::TIR_TXRQ; // Go.
/*
* Registering the pending transmission so we can track its deadline and loopback it as needed
*/
TxItem& txi = pending_tx_[txmailbox];
txi.deadline = tx_deadline;
txi.frame = frame;
txi.loopback = (flags & uavcan::CanIOFlagLoopback) == uavcan::CanIOFlagLoopback;
txi.pending = true;
return 1;
}
uavcan::int16_t CanIface::receive(uavcan::CanFrame& out_frame, uavcan::MonotonicTime& out_ts_monotonic,
uavcan::UtcTime& out_ts_utc, uavcan::CanIOFlags& out_flags)
{
out_ts_monotonic = clock::getMonotonic(); // High precision is not required for monotonic timestamps
uavcan::uint64_t utc_usec = 0;
{
CriticalSectionLocker lock;
if (rx_queue_.getLength() == 0)
{
return 0;
}
rx_queue_.pop(out_frame, utc_usec, out_flags);
}
out_ts_utc = uavcan::UtcTime::fromUSec(utc_usec);
return 1;
}
uavcan::int16_t CanIface::configureFilters(const uavcan::CanFilterConfig* filter_configs,
uavcan::uint16_t num_configs)
{
// TODO: Hardware filter support
CriticalSectionLocker lock;
(void)filter_configs;
(void)num_configs;
return -1;
}
bool CanIface::waitMsrINakBitStateChange(bool target_state)
{
#if UAVCAN_STM32_NUTTX
const unsigned Timeout = 500;
#else
const unsigned Timeout = 2000000;
#endif
for (unsigned wait_ack = 0; wait_ack < Timeout; wait_ack++)
{
const bool state = (can_->MSR & bxcan::MSR_INAK) != 0;
if (state == target_state)
{
return true;
}
#if UAVCAN_STM32_NUTTX
::usleep(2000);
#endif
}
return false;
}
int CanIface::init(uavcan::uint32_t bitrate)
{
int res = 0;
/*
* CAN timings for this bitrate
*/
Timings timings;
res = computeTimings(bitrate, timings);
if (res < 0)
{
goto leave;
}
UAVCAN_STM32_LOG("Timings: presc=%u sjw=%u bs1=%u bs2=%u",
unsigned(timings.prescaler), unsigned(timings.sjw), unsigned(timings.bs1), unsigned(timings.bs2));
/*
* Hardware initialization
*/
can_->MCR &= ~bxcan::MCR_SLEEP; // Exit sleep mode
can_->MCR |= bxcan::MCR_INRQ; // Request init
if (!waitMsrINakBitStateChange(true))
{
UAVCAN_STM32_LOG("MSR INAK not set");
res = -1;
goto leave;
}
can_->MCR = bxcan::MCR_ABOM | bxcan::MCR_AWUM | bxcan::MCR_INRQ; // RM page 648
can_->BTR = ((timings.sjw & 3U) << 24) |
((timings.bs1 & 15U) << 16) |
((timings.bs2 & 7U) << 20) |
(timings.prescaler & 1023U);
can_->IER = bxcan::IER_TMEIE | // TX mailbox empty
bxcan::IER_FMPIE0 | // RX FIFO 0 is not empty
bxcan::IER_FMPIE1; // RX FIFO 1 is not empty
can_->MCR &= ~bxcan::MCR_INRQ; // Leave init mode
if (!waitMsrINakBitStateChange(false))
{
UAVCAN_STM32_LOG("MSR INAK not cleared");
res = -1;
goto leave;
}
/*
* Default filter configuration
*/
if (self_index_ == 0)
{
can_->FMR |= bxcan::FMR_FINIT;
can_->FMR &= 0xFFFFC0F1;
can_->FMR |= static_cast<uavcan::uint32_t>(NumFilters) << 8; // Slave (CAN2) gets half of the filters
can_->FFA1R = 0; // All assigned to FIFO0 by default
can_->FM1R = 0; // Indentifier Mask mode
#if UAVCAN_STM32_NUM_IFACES > 1
can_->FS1R = 0x7ffffff; // Single 32-bit for all
can_->FilterRegister[0].FR1 = 0; // CAN1 accepts everything
can_->FilterRegister[0].FR2 = 0;
can_->FilterRegister[NumFilters].FR1 = 0; // CAN2 accepts everything
can_->FilterRegister[NumFilters].FR2 = 0;
can_->FA1R = 1 | (1 << NumFilters); // One filter per each iface
#else
can_->FS1R = 0x1fff;
can_->FilterRegister[0].FR1 = 0;
can_->FilterRegister[0].FR2 = 0;
can_->FA1R = 1;
#endif
can_->FMR &= ~bxcan::FMR_FINIT;
}
leave:
return res;
}
void CanIface::pollErrorState()
{
const uavcan::uint8_t lec = uavcan::uint8_t((can_->ESR & bxcan::ESR_LEC_MASK) >> bxcan::ESR_LEC_SHIFT);
if (lec != 0)
{
last_hw_error_code_ = lec;
can_->ESR = 0;
error_cnt_++;
}
}
void CanIface::handleTxMailboxInterrupt(uavcan::uint8_t mailbox_index, bool txok, const uavcan::uint64_t utc_usec)
{
UAVCAN_ASSERT(mailbox_index < NumTxMailboxes);
had_activity_ = had_activity_ || txok;
TxItem& txi = pending_tx_[mailbox_index];
if (txi.loopback && txok && txi.pending)
{
rx_queue_.push(txi.frame, utc_usec, uavcan::CanIOFlagLoopback);
}
if (!txok)
{
error_cnt_++;
}
txi.pending = false;
}
void CanIface::handleTxInterrupt(const uavcan::uint64_t utc_usec)
{
// TXOK == false means that there was a hardware failure
if (can_->TSR & bxcan::TSR_RQCP0)
{
const bool txok = can_->TSR & bxcan::TSR_TXOK0;
can_->TSR = bxcan::TSR_RQCP0;
handleTxMailboxInterrupt(0, txok, utc_usec);
}
if (can_->TSR & bxcan::TSR_RQCP1)
{
const bool txok = can_->TSR & bxcan::TSR_TXOK1;
can_->TSR = bxcan::TSR_RQCP1;
handleTxMailboxInterrupt(1, txok, utc_usec);
}
if (can_->TSR & bxcan::TSR_RQCP2)
{
const bool txok = can_->TSR & bxcan::TSR_TXOK2;
can_->TSR = bxcan::TSR_RQCP2;
handleTxMailboxInterrupt(2, txok, utc_usec);
}
pollErrorState();
update_event_.signalFromInterrupt();
}
void CanIface::handleRxInterrupt(uavcan::uint8_t fifo_index, uavcan::uint64_t utc_usec)
{
UAVCAN_ASSERT(fifo_index < 2);
volatile uavcan::uint32_t* const rfr_reg = (fifo_index == 0) ? &can_->RF0R : &can_->RF1R;
if ((*rfr_reg & bxcan::RFR_FMP_MASK) == 0)
{
UAVCAN_ASSERT(0); // Weird, IRQ is here but no data to read
return;
}
/*
* Register overflow as a hardware error
*/
if ((*rfr_reg & bxcan::RFR_FOVR) != 0)
{
error_cnt_++;
}
/*
* Read the frame contents
*/
uavcan::CanFrame frame;
const bxcan::RxMailboxType& rf = can_->RxMailbox[fifo_index];
if ((rf.RIR & bxcan::RIR_IDE) == 0)
{
frame.id = uavcan::CanFrame::MaskStdID & (rf.RIR >> 21);
}
else
{
frame.id = uavcan::CanFrame::MaskExtID & (rf.RIR >> 3);
frame.id |= uavcan::CanFrame::FlagEFF;
}
if ((rf.RIR & bxcan::RIR_RTR) != 0)
{
frame.id |= uavcan::CanFrame::FlagRTR;
}
frame.dlc = rf.RDTR & 15;
frame.data[0] = uavcan::uint8_t(0xFF & (rf.RDLR >> 0));
frame.data[1] = uavcan::uint8_t(0xFF & (rf.RDLR >> 8));
frame.data[2] = uavcan::uint8_t(0xFF & (rf.RDLR >> 16));
frame.data[3] = uavcan::uint8_t(0xFF & (rf.RDLR >> 24));
frame.data[4] = uavcan::uint8_t(0xFF & (rf.RDHR >> 0));
frame.data[5] = uavcan::uint8_t(0xFF & (rf.RDHR >> 8));
frame.data[6] = uavcan::uint8_t(0xFF & (rf.RDHR >> 16));
frame.data[7] = uavcan::uint8_t(0xFF & (rf.RDHR >> 24));
*rfr_reg = bxcan::RFR_RFOM | bxcan::RFR_FOVR | bxcan::RFR_FULL; // Release FIFO entry we just read
/*
* Store with timeout into the FIFO buffer and signal update event
*/
rx_queue_.push(frame, utc_usec, 0);
had_activity_ = true;
pollErrorState();
update_event_.signalFromInterrupt();
}
void CanIface::discardTimedOutTxMailboxes(uavcan::MonotonicTime current_time)
{
static const uavcan::uint32_t AbortFlags[NumTxMailboxes] = { bxcan::TSR_ABRQ0, bxcan::TSR_ABRQ1, bxcan::TSR_ABRQ2 };
CriticalSectionLocker lock;
for (int i = 0; i < NumTxMailboxes; i++)
{
TxItem& txi = pending_tx_[i];
if (txi.pending && txi.deadline < current_time)
{
can_->TSR = AbortFlags[i]; // Goodnight sweet transmission
txi.pending = false;
error_cnt_++;
}
}
}
bool CanIface::isTxBufferFull() const
{
return (can_->TSR & (bxcan::TSR_TME0 | bxcan::TSR_TME1 | bxcan::TSR_TME2)) == 0; // Interrupts enabled
}
bool CanIface::isRxBufferEmpty() const
{
CriticalSectionLocker lock;
return rx_queue_.getLength() == 0;
}
uavcan::uint64_t CanIface::getErrorCount() const
{
CriticalSectionLocker lock;
return error_cnt_ + rx_queue_.getOverflowCount();
}
unsigned CanIface::getRxQueueLength() const
{
CriticalSectionLocker lock;
return rx_queue_.getLength();
}
uavcan::uint8_t CanIface::yieldLastHardwareErrorCode()
{
CriticalSectionLocker lock;
const uavcan::uint8_t val = last_hw_error_code_;
last_hw_error_code_ = 0;
return val;
}
bool CanIface::hadActivity()
{
CriticalSectionLocker lock;
const bool ret = had_activity_;
had_activity_ = false;
return ret;
}
/*
* CanDriver
*/
uavcan::CanSelectMasks CanDriver::makeSelectMasks() const
{
uavcan::CanSelectMasks msk;
// Iface 0
msk.read = if0_.isRxBufferEmpty() ? 0 : 1;
msk.write = if0_.isTxBufferFull() ? 0 : 1;
// Iface 1
#if UAVCAN_STM32_NUM_IFACES > 1
if (!if1_.isRxBufferEmpty())
{
msk.read |= 1 << 1;
}
if (!if1_.isTxBufferFull())
{
msk.write |= 1 << 1;
}
#endif
return msk;
}
uavcan::int16_t CanDriver::select(uavcan::CanSelectMasks& inout_masks, const uavcan::MonotonicTime blocking_deadline)
{
const uavcan::CanSelectMasks in_masks = inout_masks;
const uavcan::MonotonicTime time = clock::getMonotonic();
if0_.discardTimedOutTxMailboxes(time); // Check TX timeouts - this may release some TX slots
#if UAVCAN_STM32_NUM_IFACES > 1
if1_.discardTimedOutTxMailboxes(time);
#endif
inout_masks = makeSelectMasks(); // Check if we already have some of the requested events
if ((inout_masks.read & in_masks.read) != 0 ||
(inout_masks.write & in_masks.write) != 0)
{
return 1;
}
(void)update_event_.wait(blocking_deadline - time); // Block until timeout expires or any iface updates
inout_masks = makeSelectMasks(); // Return what we got even if none of the requested events became signaled
return 1; // Return value doesn't matter as long as it is non-negative
}
int CanDriver::init(uavcan::uint32_t bitrate)
{
int res = 0;
UAVCAN_STM32_LOG("Bitrate %lu", static_cast<unsigned long>(bitrate));
/*
* CAN1
*/
{
CriticalSectionLocker lock;
#if UAVCAN_STM32_NUTTX
modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_CAN1EN);
modifyreg32(STM32_RCC_APB1RSTR, 0, RCC_APB1RSTR_CAN1RST);
modifyreg32(STM32_RCC_APB1RSTR, RCC_APB1RSTR_CAN1RST, 0);
#else
RCC->APB1ENR |= RCC_APB1ENR_CAN1EN;
RCC->APB1RSTR |= RCC_APB1RSTR_CAN1RST;
RCC->APB1RSTR &= ~RCC_APB1RSTR_CAN1RST;
#endif
}
UAVCAN_STM32_LOG("Initing iface 0...");
res = if0_.init(bitrate);
if (res < 0)
{
UAVCAN_STM32_LOG("Iface 0 init failed %i", res);
goto fail;
}
ifaces[0] = &if0_;
/*
* CAN2
*/
#if UAVCAN_STM32_NUM_IFACES > 1
{
CriticalSectionLocker lock;
# if UAVCAN_STM32_NUTTX
modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_CAN2EN);
modifyreg32(STM32_RCC_APB1RSTR, 0, RCC_APB1RSTR_CAN2RST);
modifyreg32(STM32_RCC_APB1RSTR, RCC_APB1RSTR_CAN2RST, 0);
# else
RCC->APB1ENR |= RCC_APB1ENR_CAN2EN;
RCC->APB1RSTR |= RCC_APB1RSTR_CAN2RST;
RCC->APB1RSTR &= ~RCC_APB1RSTR_CAN2RST;
# endif
}
UAVCAN_STM32_LOG("Initing iface 1...");
res = if1_.init(bitrate);
if (res < 0)
{
UAVCAN_STM32_LOG("Iface 1 init failed %i", res);
goto fail;
}
ifaces[1] = &if1_;
#endif
/*
* IRQ
*/
#if UAVCAN_STM32_NUTTX
# define IRQ_ATTACH(irq, handler) \
{ \
res = irq_attach(irq, handler); \
if (res < 0) \
{ \
UAVCAN_STM32_LOG("IRQ attach failed %i", irq); \
goto fail; \
} \
up_enable_irq(irq); \
}
IRQ_ATTACH(STM32_IRQ_CAN1TX, can1_irq);
IRQ_ATTACH(STM32_IRQ_CAN1RX0, can1_irq);
IRQ_ATTACH(STM32_IRQ_CAN1RX1, can1_irq);
# if UAVCAN_STM32_NUM_IFACES > 1
IRQ_ATTACH(STM32_IRQ_CAN2TX, can2_irq);
IRQ_ATTACH(STM32_IRQ_CAN2RX0, can2_irq);
IRQ_ATTACH(STM32_IRQ_CAN2RX1, can2_irq);
# endif
# undef IRQ_ATTACH
#else
{
CriticalSectionLocker lock;
nvicEnableVector(CAN1_TX_IRQn, UAVCAN_STM32_IRQ_PRIORITY_MASK);
nvicEnableVector(CAN1_RX0_IRQn, UAVCAN_STM32_IRQ_PRIORITY_MASK);
nvicEnableVector(CAN1_RX1_IRQn, UAVCAN_STM32_IRQ_PRIORITY_MASK);
# if UAVCAN_STM32_NUM_IFACES > 1
nvicEnableVector(CAN2_TX_IRQn, UAVCAN_STM32_IRQ_PRIORITY_MASK);
nvicEnableVector(CAN2_RX0_IRQn, UAVCAN_STM32_IRQ_PRIORITY_MASK);
nvicEnableVector(CAN2_RX1_IRQn, UAVCAN_STM32_IRQ_PRIORITY_MASK);
# endif
}
#endif
UAVCAN_STM32_LOG("CAN drv init OK");
UAVCAN_ASSERT(res >= 0);
return res;
fail:
UAVCAN_STM32_LOG("CAN drv init failed %i", res);
UAVCAN_ASSERT(res < 0);
CriticalSectionLocker lock;
#if UAVCAN_STM32_NUTTX
// TODO: Unattach and disable all IRQs
modifyreg32(STM32_RCC_APB1ENR, RCC_APB1ENR_CAN1EN, 0);
# if UAVCAN_STM32_NUM_IFACES > 1
modifyreg32(STM32_RCC_APB1ENR, RCC_APB1ENR_CAN2EN, 0);
# endif
#else
RCC->APB1ENR &= ~RCC_APB1ENR_CAN1EN;
# if UAVCAN_STM32_NUM_IFACES > 1
RCC->APB1ENR &= ~RCC_APB1ENR_CAN2EN;
# endif
#endif
return res;
}
CanIface* CanDriver::getIface(uavcan::uint8_t iface_index)
{
if (iface_index < UAVCAN_STM32_NUM_IFACES)
{
return ifaces[iface_index];
}
return NULL;
}
bool CanDriver::hadActivity()
{
bool ret = if0_.hadActivity();
#if UAVCAN_STM32_NUM_IFACES > 1
ret |= if1_.hadActivity();
#endif
return ret;
}
} // namespace uavcan_stm32
/*
* Interrupt handlers
*/
extern "C"
{
#if UAVCAN_STM32_NUTTX
static int can1_irq(const int irq, void*)
{
if (irq == STM32_IRQ_CAN1TX)
{
uavcan_stm32::handleTxInterrupt(0);
}
else if (irq == STM32_IRQ_CAN1RX0)
{
uavcan_stm32::handleRxInterrupt(0, 0);
}
else if (irq == STM32_IRQ_CAN1RX1)
{
uavcan_stm32::handleRxInterrupt(0, 1);
}
else
{
PANIC();
}
return 0;
}
# if UAVCAN_STM32_NUM_IFACES > 1
static int can2_irq(const int irq, void*)
{
if (irq == STM32_IRQ_CAN2TX)
{
uavcan_stm32::handleTxInterrupt(1);
}
else if (irq == STM32_IRQ_CAN2RX0)
{
uavcan_stm32::handleRxInterrupt(1, 0);
}
else if (irq == STM32_IRQ_CAN2RX1)
{
uavcan_stm32::handleRxInterrupt(1, 1);
}
else
{
PANIC();
}
return 0;
}
# endif
#else // UAVCAN_STM32_NUTTX
UAVCAN_STM32_IRQ_HANDLER(CAN1_TX_IRQHandler)
{
UAVCAN_STM32_IRQ_PROLOGUE();
uavcan_stm32::handleTxInterrupt(0);
UAVCAN_STM32_IRQ_EPILOGUE();
}
UAVCAN_STM32_IRQ_HANDLER(CAN1_RX0_IRQHandler)
{
UAVCAN_STM32_IRQ_PROLOGUE();
uavcan_stm32::handleRxInterrupt(0, 0);
UAVCAN_STM32_IRQ_EPILOGUE();
}
UAVCAN_STM32_IRQ_HANDLER(CAN1_RX1_IRQHandler)
{
UAVCAN_STM32_IRQ_PROLOGUE();
uavcan_stm32::handleRxInterrupt(0, 1);
UAVCAN_STM32_IRQ_EPILOGUE();
}
# if UAVCAN_STM32_NUM_IFACES > 1
UAVCAN_STM32_IRQ_HANDLER(CAN2_TX_IRQHandler)
{
UAVCAN_STM32_IRQ_PROLOGUE();
uavcan_stm32::handleTxInterrupt(1);
UAVCAN_STM32_IRQ_EPILOGUE();
}
UAVCAN_STM32_IRQ_HANDLER(CAN2_RX0_IRQHandler)
{
UAVCAN_STM32_IRQ_PROLOGUE();
uavcan_stm32::handleRxInterrupt(1, 0);
UAVCAN_STM32_IRQ_EPILOGUE();
}
UAVCAN_STM32_IRQ_HANDLER(CAN2_RX1_IRQHandler)
{
UAVCAN_STM32_IRQ_PROLOGUE();
uavcan_stm32::handleRxInterrupt(1, 1);
UAVCAN_STM32_IRQ_EPILOGUE();
}
# endif
#endif // UAVCAN_STM32_NUTTX
} // extern "C"
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