source: rtems/bsps/arm/atsam/include/bsp/atsam-i2c.h @ 5cb23f4b

Last change on this file since 5cb23f4b was 5cb23f4b, checked in by Sebastian Huber <sebastian.huber@…>, on Oct 1, 2018 at 6:59:14 AM

bsp/atsam: Use binary semaphore for I2C

Remove superfluous sleep before each I2C transfer. Reset I2C module
after transfer timeouts.

Update #3534.

  • Property mode set to 100644
File size: 1.4 KB
Line 
1/*
2 * Copyright (c) 2016 embedded brains GmbH.  All rights reserved.
3 *
4 *  embedded brains GmbH
5 *  Dornierstr. 4
6 *  82178 Puchheim
7 *  Germany
8 *  <info@embedded-brains.de>
9 *
10 * The license and distribution terms for this file may be
11 * found in the file LICENSE in this distribution or at
12 * http://www.rtems.org/license/LICENSE.
13 */
14
15#ifndef LIBBSP_ARM_ATSAM_ATSAM_I2C_H
16#define LIBBSP_ARM_ATSAM_ATSAM_I2C_H
17
18#include <libchip/chip.h>
19#include <libchip/include/pio.h>
20
21#include <bsp.h>
22#include <rtems/thread.h>
23#include <dev/i2c/i2c.h>
24
25#ifdef __cplusplus
26extern "C" {
27#endif /* __cplusplus */
28
29#define TWI_AMOUNT_PINS 2
30
31typedef enum {
32        TX_SEND_DATA,
33        TX_SEND_STOP,
34        TX_CONT_MESSAGE_NEEDED,
35        RX_SEND_DATA,
36        RX_SEND_STOP,
37        RX_CONT_MESSAGE_NEEDED,
38        TX_RX_STOP_SENT
39}transfer_state;
40
41typedef struct {
42        uint8_t status;
43        uint8_t *data;
44        bool stop_request;
45        uint32_t data_size;
46        uint32_t already_transferred;
47        transfer_state trans_state;
48} transfer_desc;
49
50typedef struct {
51        i2c_bus base;
52        i2c_msg *msgs;
53        Twihs *regs;
54        transfer_desc trans_desc;
55        uint32_t msg_todo;
56        uint32_t current_msg_todo;
57        uint8_t *current_msg_byte;
58        uint32_t output_clock;
59        bool read;
60        rtems_binary_semaphore sem;
61        rtems_vector_number irq;
62} atsam_i2c_bus;
63
64int i2c_bus_register_atsam(
65    const char *bus_path,
66    Twihs *register_base,
67    rtems_vector_number irq,
68    const Pin pins[TWI_AMOUNT_PINS]
69);
70
71#ifdef __cplusplus
72}
73#endif /* __cplusplus */
74
75#endif /* LIBBSP_ARM_ATSAM_ATSAM_I2C_H */
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