candev_mcp2515.h

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/*
 * Copyright (C) 2016 OTA keys S.A.
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include <stdbool.h>
 
#include "can/candev.h"
#include "cpu_conf.h"
#include "periph/gpio.h"
#include "periph/spi.h"
#include "mutex.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#ifndef CANDEV_MCP2515_DEFAULT_BITRATE
#define CANDEV_MCP2515_DEFAULT_BITRATE 500000
#endif

#ifndef CANDEV_MCP2515_DEFAULT_SPT
#define CANDEV_MCP2515_DEFAULT_SPT 875
#endif

#define MCP2515_TX_MAILBOXES 3

#define MCP2515_RX_MAILBOXES 2
#define MCP2515_FILTERS_MB0 2
#define MCP2515_FILTERS_MB1 4
#define MCP2515_FILTERS (MCP2515_FILTERS_MB0 + MCP2515_FILTERS_MB1)

typedef struct candev_mcp2515 candev_mcp2515_t;

typedef struct candev_mcp2515_conf {
    spi_t spi;                  
    spi_mode_t spi_mode;        
    spi_clk_t spi_clk;          
    gpio_t cs_pin;              
    gpio_t rst_pin;             
    gpio_t int_pin;             
    uint32_t clk;               
} candev_mcp2515_conf_t;

struct candev_mcp2515 {
    candev_t candev;
    const candev_mcp2515_conf_t *conf;
    const struct can_frame *tx_mailbox[MCP2515_TX_MAILBOXES];
    struct can_frame rx_buf[MCP2515_RX_MAILBOXES];
    uint32_t masks[MCP2515_RX_MAILBOXES];
    canid_t filter_ids[MCP2515_RX_MAILBOXES][MCP2515_FILTERS_MB1];
    int wakeup_src;
};

void candev_mcp2515_init(candev_mcp2515_t *dev,
                         const candev_mcp2515_conf_t *conf);
 
#ifdef __cplusplus
}
#endif