source: rtems/bsps/arm/atsam/include/bsp/atsam-i2c.h @ 0074c9ec

Last change on this file since 0074c9ec was 0074c9ec, checked in by Christian Mauderer <christian.mauderer@…>, on 02/03/22 at 08:38:40

bsp/atsam/i2c: Add error return and fix edge cases

The driver didn't return with an error on (for example) a NACK on the
bus. This adds the expected error return. Due to the new case that a
transfer can be interrupted on an error, there were some new edge cases.
This patch therefore also fixes these edge cases by removing the
transfer_state that more or less duplicated the interrupt states.

Fixes #4592
  • Property mode set to 100644
File size: 1.3 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 struct {
32        i2c_bus base;
33        Twihs *regs;
34
35        /* First message and number of messages that have to be processed. */
36        i2c_msg *msgs;
37        uint32_t msg_todo;
38
39        /* Information about the current transfer. */
40        bool stop_request;
41        uint32_t current_msg_todo;
42        uint8_t *current_msg_byte;
43
44        /* Error information that can be returned to the task */
45        uint32_t err;
46
47        uint32_t output_clock;
48        rtems_binary_semaphore sem;
49        rtems_vector_number irq;
50} atsam_i2c_bus;
51
52int i2c_bus_register_atsam(
53    const char *bus_path,
54    Twihs *register_base,
55    rtems_vector_number irq,
56    const Pin pins[TWI_AMOUNT_PINS]
57);
58
59#ifdef __cplusplus
60}
61#endif /* __cplusplus */
62
63#endif /* LIBBSP_ARM_ATSAM_ATSAM_I2C_H */
Note: See TracBrowser for help on using the repository browser.