371 lines
9.7 KiB
C
371 lines
9.7 KiB
C
// cut down version of the can.h driver. allows pedal-like devices to work like Pandas
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// IRQs: CAN1_TX, CAN1_RX0, CAN1_SCE
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// CAN2_TX, CAN2_RX0, CAN2_SCE
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// CAN3_TX, CAN3_RX0, CAN3_SCE
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typedef struct {
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volatile uint32_t w_ptr;
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volatile uint32_t r_ptr;
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uint32_t fifo_size;
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CAN_FIFOMailBox_TypeDef *elems;
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} can_ring;
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#define CAN_BUS_RET_FLAG 0x80U
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#define CAN_BUS_NUM_MASK 0x7FU
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#define BUS_MAX 4U
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uint32_t can_rx_errs = 0;
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uint32_t can_send_errs = 0;
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uint32_t can_fwd_errs = 0;
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extern int can_live, pending_can_live;
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// must reinit after changing these
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extern int can_loopback, can_silent;
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extern uint32_t can_speed[4];
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void can_set_forwarding(int from, int to);
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bool can_init(uint8_t can_number);
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void can_init_all(void);
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bool can_tx_check_min_slots_free(uint32_t min);
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void can_send(CAN_FIFOMailBox_TypeDef *to_push, uint8_t bus_number, bool skip_tx_hook);
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bool can_pop(can_ring *q, CAN_FIFOMailBox_TypeDef *elem);
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// Ignition detected from CAN meessages
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bool ignition_can = false;
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bool ignition_cadillac = false;
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uint32_t ignition_can_cnt = 0U;
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// end API
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#define ALL_CAN_SILENT 0xFF
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#define ALL_CAN_LIVE 0
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int can_live = 0, pending_can_live = 0, can_loopback = 0, can_silent = ALL_CAN_SILENT;
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// ********************* instantiate queues *********************
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#define can_buffer(x, size) \
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CAN_FIFOMailBox_TypeDef elems_##x[size]; \
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can_ring can_##x = { .w_ptr = 0, .r_ptr = 0, .fifo_size = size, .elems = (CAN_FIFOMailBox_TypeDef *)&elems_##x };
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can_buffer(rx_q, 0x1000)
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can_buffer(tx1_q, 0x100)
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can_buffer(tx2_q, 0x100)
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can_buffer(tx3_q, 0x100)
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can_ring *can_queues[] = {&can_tx1_q, &can_tx2_q, &can_tx3_q};
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// global CAN stats
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int can_rx_cnt = 0;
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int can_tx_cnt = 0;
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int can_txd_cnt = 0;
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int can_err_cnt = 0;
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int can_overflow_cnt = 0;
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// ********************* interrupt safe queue *********************
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bool can_pop(can_ring *q, CAN_FIFOMailBox_TypeDef *elem) {
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bool ret = 0;
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ENTER_CRITICAL();
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if (q->w_ptr != q->r_ptr) {
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*elem = q->elems[q->r_ptr];
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if ((q->r_ptr + 1U) == q->fifo_size) {
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q->r_ptr = 0;
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} else {
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q->r_ptr += 1U;
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}
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ret = 1;
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}
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EXIT_CRITICAL();
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return ret;
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}
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bool can_push(can_ring *q, CAN_FIFOMailBox_TypeDef *elem) {
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bool ret = false;
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uint32_t next_w_ptr;
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ENTER_CRITICAL();
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if ((q->w_ptr + 1U) == q->fifo_size) {
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next_w_ptr = 0;
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} else {
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next_w_ptr = q->w_ptr + 1U;
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}
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if (next_w_ptr != q->r_ptr) {
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q->elems[q->w_ptr] = *elem;
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q->w_ptr = next_w_ptr;
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ret = true;
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}
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EXIT_CRITICAL();
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if (!ret) {
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can_overflow_cnt++;
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#ifdef DEBUG
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puts("can_push failed!\n");
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#endif
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}
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return ret;
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}
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uint32_t can_slots_empty(can_ring *q) {
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uint32_t ret = 0;
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ENTER_CRITICAL();
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if (q->w_ptr >= q->r_ptr) {
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ret = q->fifo_size - 1U - q->w_ptr + q->r_ptr;
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} else {
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ret = q->r_ptr - q->w_ptr - 1U;
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}
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EXIT_CRITICAL();
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return ret;
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}
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void can_clear(can_ring *q) {
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ENTER_CRITICAL();
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q->w_ptr = 0;
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q->r_ptr = 0;
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EXIT_CRITICAL();
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}
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// assign CAN numbering
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// bus num: Can bus number on ODB connector. Sent to/from USB
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// Min: 0; Max: 127; Bit 7 marks message as receipt (bus 129 is receipt for but 1)
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// cans: Look up MCU can interface from bus number
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// can number: numeric lookup for MCU CAN interfaces (0 = CAN1, 1 = CAN2, etc);
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// bus_lookup: Translates from 'can number' to 'bus number'.
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// can_num_lookup: Translates from 'bus number' to 'can number'.
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// can_forwarding: Given a bus num, lookup bus num to forward to. -1 means no forward.
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// Panda: Bus 0=CAN1 Bus 1=CAN2 Bus 2=CAN3
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CAN_TypeDef *cans[] = {CAN1, CAN2, CAN3};
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uint8_t bus_lookup[] = {0,1,2};
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uint8_t can_num_lookup[] = {0,1,2,-1};
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int8_t can_forwarding[] = {-1,-1,-1,-1};
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uint32_t can_speed[] = {5000, 5000, 5000, 333};
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#define CAN_MAX 3U
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#define CANIF_FROM_CAN_NUM(num) (cans[num])
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#define CAN_NUM_FROM_CANIF(CAN) ((CAN)==CAN1 ? 0 : ((CAN) == CAN2 ? 1 : 2))
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#define BUS_NUM_FROM_CAN_NUM(num) (bus_lookup[num])
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#define CAN_NUM_FROM_BUS_NUM(num) (can_num_lookup[num])
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void process_can(uint8_t can_number);
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bool can_set_speed(uint8_t can_number) {
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bool ret = true;
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CAN_TypeDef *CAN = CANIF_FROM_CAN_NUM(can_number);
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uint8_t bus_number = BUS_NUM_FROM_CAN_NUM(can_number);
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ret &= llcan_set_speed(CAN, can_speed[bus_number], can_loopback, (unsigned int)(can_silent) & (1U << can_number));
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return ret;
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}
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void can_init_all(void) {
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bool ret = true;
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for (uint8_t i=0U; i < CAN_MAX; i++) {
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can_clear(can_queues[i]);
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ret &= can_init(i);
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}
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UNUSED(ret);
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}
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void can_flip_buses(uint8_t bus1, uint8_t bus2){
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bus_lookup[bus1] = bus2;
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bus_lookup[bus2] = bus1;
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can_num_lookup[bus1] = bus2;
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can_num_lookup[bus2] = bus1;
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}
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// CAN error
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void can_sce(CAN_TypeDef *CAN) {
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ENTER_CRITICAL();
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#ifdef DEBUG
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if (CAN==CAN1) puts("CAN1: ");
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if (CAN==CAN2) puts("CAN2: ");
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#ifdef CAN3
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if (CAN==CAN3) puts("CAN3: ");
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#endif
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puts("MSR:");
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puth(CAN->MSR);
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puts(" TSR:");
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puth(CAN->TSR);
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puts(" RF0R:");
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puth(CAN->RF0R);
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puts(" RF1R:");
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puth(CAN->RF1R);
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puts(" ESR:");
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puth(CAN->ESR);
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puts("\n");
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#endif
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can_err_cnt += 1;
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llcan_clear_send(CAN);
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EXIT_CRITICAL();
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}
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// ***************************** CAN *****************************
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void process_can(uint8_t can_number) {
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if (can_number != 0xffU) {
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ENTER_CRITICAL();
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CAN_TypeDef *CAN = CANIF_FROM_CAN_NUM(can_number);
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uint8_t bus_number = BUS_NUM_FROM_CAN_NUM(can_number);
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// check for empty mailbox
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CAN_FIFOMailBox_TypeDef to_send;
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if ((CAN->TSR & CAN_TSR_TME0) == CAN_TSR_TME0) {
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// add successfully transmitted message to my fifo
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if ((CAN->TSR & CAN_TSR_RQCP0) == CAN_TSR_RQCP0) {
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can_txd_cnt += 1;
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if ((CAN->TSR & CAN_TSR_TXOK0) == CAN_TSR_TXOK0) {
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CAN_FIFOMailBox_TypeDef to_push;
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to_push.RIR = CAN->sTxMailBox[0].TIR;
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to_push.RDTR = (CAN->sTxMailBox[0].TDTR & 0xFFFF000FU) | ((CAN_BUS_RET_FLAG | bus_number) << 4);
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to_push.RDLR = CAN->sTxMailBox[0].TDLR;
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to_push.RDHR = CAN->sTxMailBox[0].TDHR;
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can_send_errs += can_push(&can_rx_q, &to_push) ? 0U : 1U;
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}
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if ((CAN->TSR & CAN_TSR_TERR0) == CAN_TSR_TERR0) {
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#ifdef DEBUG
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puts("CAN TX ERROR!\n");
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#endif
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}
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if ((CAN->TSR & CAN_TSR_ALST0) == CAN_TSR_ALST0) {
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#ifdef DEBUG
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puts("CAN TX ARBITRATION LOST!\n");
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#endif
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}
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// clear interrupt
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// careful, this can also be cleared by requesting a transmission
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CAN->TSR |= CAN_TSR_RQCP0;
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}
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if (can_pop(can_queues[bus_number], &to_send)) {
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can_tx_cnt += 1;
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// only send if we have received a packet
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CAN->sTxMailBox[0].TDLR = to_send.RDLR;
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CAN->sTxMailBox[0].TDHR = to_send.RDHR;
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CAN->sTxMailBox[0].TDTR = to_send.RDTR;
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CAN->sTxMailBox[0].TIR = to_send.RIR;
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if (can_tx_check_min_slots_free(MAX_CAN_MSGS_PER_BULK_TRANSFER)) {
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usb_outep3_resume_if_paused();
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}
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}
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}
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EXIT_CRITICAL();
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}
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}
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void ignition_can_hook(CAN_FIFOMailBox_TypeDef *to_push) {
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int bus = GET_BUS(to_push);
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int addr = GET_ADDR(to_push);
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int len = GET_LEN(to_push);
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ignition_can_cnt = 0U; // reset counter
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if (bus == 0) {
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// TODO: verify on all supported GM models that we can reliably detect ignition using only this signal,
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// since the 0x1F1 signal can briefly go low immediately after ignition
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if ((addr == 0x160) && (len == 5)) {
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// this message isn't all zeros when ignition is on
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ignition_cadillac = GET_BYTES_04(to_push) != 0;
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}
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// GM exception
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if ((addr == 0x1F1) && (len == 8)) {
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// Bit 5 is ignition "on"
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bool ignition_gm = ((GET_BYTE(to_push, 0) & 0x20) != 0);
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ignition_can = ignition_gm || ignition_cadillac;
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}
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// Tesla exception
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if ((addr == 0x348) && (len == 8)) {
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// GTW_status
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ignition_can = (GET_BYTE(to_push, 0) & 0x1) != 0;
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}
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}
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}
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// CAN receive handlers
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// blink blue when we are receiving CAN messages
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void can_rx(uint8_t can_number) {
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CAN_TypeDef *CAN = CANIF_FROM_CAN_NUM(can_number);
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uint8_t bus_number = BUS_NUM_FROM_CAN_NUM(can_number);
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while ((CAN->RF0R & CAN_RF0R_FMP0) != 0) {
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can_rx_cnt += 1;
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// can is live
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pending_can_live = 1;
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// add to my fifo
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CAN_FIFOMailBox_TypeDef to_push;
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to_push.RIR = CAN->sFIFOMailBox[0].RIR;
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to_push.RDTR = CAN->sFIFOMailBox[0].RDTR;
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to_push.RDLR = CAN->sFIFOMailBox[0].RDLR;
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to_push.RDHR = CAN->sFIFOMailBox[0].RDHR;
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// modify RDTR for our API
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to_push.RDTR = (to_push.RDTR & 0xFFFF000F) | (bus_number << 4);
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can_send_errs += can_push(&can_rx_q, &to_push) ? 0U : 1U;
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// next
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CAN->RF0R |= CAN_RF0R_RFOM0;
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}
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}
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bool can_tx_check_min_slots_free(uint32_t min) {
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return
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(can_slots_empty(&can_tx1_q) >= min) &&
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(can_slots_empty(&can_tx2_q) >= min) &&
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(can_slots_empty(&can_tx3_q) >= min);
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}
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void can_send(CAN_FIFOMailBox_TypeDef *to_push, uint8_t bus_number, bool skip_tx_hook) {
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if (!skip_tx_hook) {
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#ifdef DEBUG
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puts("TX CAN");
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puth2(bus_number);
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puts(" ");
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puth(to_push->RIR >> 21);
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puts("\n");
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#endif
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if (bus_number < BUS_MAX) {
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// add CAN packet to send queue
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// bus number isn't passed through
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to_push->RDTR &= 0xF;
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can_fwd_errs += can_push(can_queues[bus_number], to_push) ? 0U : 1U;
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process_can(CAN_NUM_FROM_BUS_NUM(bus_number));
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}
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}
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}
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void can_set_forwarding(int from, int to) {
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can_forwarding[from] = to;
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}
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bool can_init(uint8_t can_number) {
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bool ret = false;
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if (can_number != 0xffU) {
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CAN_TypeDef *CAN = CANIF_FROM_CAN_NUM(can_number);
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ret &= can_set_speed(can_number);
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ret &= llcan_init(CAN);
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// in case there are queued up messages
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process_can(can_number);
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}
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return ret;
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}
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