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stmhal: Added support for extended CAN frames.

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This commit is contained in:
Henrik Sölver 2014-10-26 21:51:30 +01:00 committed by Damien George
parent 0e557facb9
commit 504636815e
2 changed files with 25 additions and 8 deletions
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32
stmhal/can.c
View File

@ -60,13 +60,14 @@
///
/// from pyb import CAN
/// can = pyb.CAN(1, pyb.CAN.LOOPBACK)
/// can.send('message!', 123) # send message to id 123
/// can.send('message!', 123) # send message with id 123
/// can.recv(0) # receive message on FIFO 0
typedef struct _pyb_can_obj_t {
mp_obj_base_t base;
mp_uint_t can_id : 8;
bool is_enabled : 1;
bool extframe : 1;
CAN_HandleTypeDef can;
} pyb_can_obj_t;
@ -151,6 +152,12 @@ STATIC void pyb_can_print(void (*print)(void *env, const char *fmt, ...), void *
case CAN_MODE_SILENT: mode = MP_QSTR_SILENT; break;
case CAN_MODE_SILENT_LOOPBACK: default: mode = MP_QSTR_SILENT_LOOPBACK; break;
}
print(env, "%s, ", qstr_str(mode));
if (self->extframe) {
mode = MP_QSTR_True;
} else {
mode = MP_QSTR_False;
}
print(env, "%s)", qstr_str(mode));
}
}
@ -162,8 +169,9 @@ STATIC void pyb_can_print(void (*print)(void *env, const char *fmt, ...), void *
/// - `mode` is one of: NORMAL, LOOPBACK, SILENT, SILENT_LOOPBACK
STATIC mp_obj_t pyb_can_init_helper(pyb_can_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = CAN_MODE_NORMAL} },
{ MP_QSTR_prescaler, MP_ARG_INT, {.u_int = 100} },
{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = CAN_MODE_NORMAL} },
{ MP_QSTR_extframe, MP_ARG_BOOL, {.u_bool = false} },
{ MP_QSTR_prescaler, MP_ARG_INT, {.u_int = 100} },
/*
{ MP_QSTR_sjw, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
{ MP_QSTR_bs1, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 6} },
@ -175,11 +183,12 @@ STATIC mp_obj_t pyb_can_init_helper(pyb_can_obj_t *self, mp_uint_t n_args, const
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
self->extframe = args[1].u_bool;
// set the CAN configuration values
memset(&self->can, 0, sizeof(self->can));
CAN_InitTypeDef *init = &self->can.Init;
init->Mode = args[0].u_int << 4; // shift-left so modes fit in a small-int
init->Prescaler = args[1].u_int;
init->Prescaler = args[2].u_int;
init->SJW = CAN_SJW_1TQ; // TODO set from args
init->BS1 = CAN_BS1_6TQ; // TODO set from args
init->BS2 = CAN_BS2_8TQ; // TODO set from args
@ -317,13 +326,20 @@ STATIC mp_obj_t pyb_can_send(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_
mp_buffer_info_t bufinfo;
uint8_t data[1];
pyb_buf_get_for_send(args[0].u_obj, &bufinfo, data);
// TODO check bufinfo.len <= 8
if (bufinfo.len > 8) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "CAN data field too long"));
}
// send the data
CanTxMsgTypeDef tx_msg;
tx_msg.StdId = args[1].u_int & 0x7ff;
tx_msg.ExtId = 0; // TODO support extended ids
tx_msg.IDE = CAN_ID_STD;
if (self->extframe){
tx_msg.ExtId = args[1].u_int & 0x1FFFFFFF;
tx_msg.IDE = CAN_ID_EXT;
} else {
tx_msg.StdId = args[1].u_int & 0x7FF;
tx_msg.IDE = CAN_ID_STD;
}
tx_msg.RTR = CAN_RTR_DATA;
tx_msg.DLC = bufinfo.len;
for (mp_uint_t i = 0; i < bufinfo.len; i++) {

1
stmhal/qstrdefsport.h
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@ -167,6 +167,7 @@ Q(recv)
Q(addr)
Q(fifo)
Q(timeout)
Q(extframe)
Q(NORMAL)
Q(LOOPBACK)
Q(SILENT)