5
Last change
on this file since 5cb23f4b was
5cb23f4b,
checked in by Sebastian Huber <sebastian.huber@…>, on 10/01/18 at 06:59:14
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bsp/atsam: Use binary semaphore for I2C
Remove superfluous sleep before each I2C transfer. Reset I2C module
after transfer timeouts.
Update #3534.
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-
Property mode set to
100644
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File size:
1.4 KB
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Rev | Line | |
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[0c1413c] | 1 | /* |
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| 2 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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| 3 | * |
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| 4 | * embedded brains GmbH |
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| 5 | * Dornierstr. 4 |
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| 6 | * 82178 Puchheim |
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| 7 | * Germany |
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| 8 | * <info@embedded-brains.de> |
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| 9 | * |
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| 10 | * The license and distribution terms for this file may be |
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| 11 | * found in the file LICENSE in this distribution or at |
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| 12 | * http://www.rtems.org/license/LICENSE. |
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| 13 | */ |
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| 14 | |
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| 15 | #ifndef LIBBSP_ARM_ATSAM_ATSAM_I2C_H |
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| 16 | #define LIBBSP_ARM_ATSAM_ATSAM_I2C_H |
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| 17 | |
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| 18 | #include <libchip/chip.h> |
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| 19 | #include <libchip/include/pio.h> |
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| 20 | |
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| 21 | #include <bsp.h> |
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[5cb23f4b] | 22 | #include <rtems/thread.h> |
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[0c1413c] | 23 | #include <dev/i2c/i2c.h> |
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| 24 | |
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| 25 | #ifdef __cplusplus |
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| 26 | extern "C" { |
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| 27 | #endif /* __cplusplus */ |
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| 28 | |
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| 29 | #define TWI_AMOUNT_PINS 2 |
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| 30 | |
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| 31 | typedef enum { |
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| 32 | TX_SEND_DATA, |
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| 33 | TX_SEND_STOP, |
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| 34 | TX_CONT_MESSAGE_NEEDED, |
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| 35 | RX_SEND_DATA, |
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| 36 | RX_SEND_STOP, |
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| 37 | RX_CONT_MESSAGE_NEEDED, |
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| 38 | TX_RX_STOP_SENT |
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| 39 | }transfer_state; |
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| 40 | |
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| 41 | typedef struct { |
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| 42 | uint8_t status; |
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| 43 | uint8_t *data; |
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| 44 | bool stop_request; |
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| 45 | uint32_t data_size; |
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| 46 | uint32_t already_transferred; |
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| 47 | transfer_state trans_state; |
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| 48 | } transfer_desc; |
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| 49 | |
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| 50 | typedef struct { |
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| 51 | i2c_bus base; |
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| 52 | i2c_msg *msgs; |
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| 53 | Twihs *regs; |
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| 54 | transfer_desc trans_desc; |
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| 55 | uint32_t msg_todo; |
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| 56 | uint32_t current_msg_todo; |
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| 57 | uint8_t *current_msg_byte; |
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[5cb23f4b] | 58 | uint32_t output_clock; |
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[0c1413c] | 59 | bool read; |
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[5cb23f4b] | 60 | rtems_binary_semaphore sem; |
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[0c1413c] | 61 | rtems_vector_number irq; |
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| 62 | } atsam_i2c_bus; |
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| 63 | |
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| 64 | int i2c_bus_register_atsam( |
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| 65 | const char *bus_path, |
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| 66 | Twihs *register_base, |
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| 67 | rtems_vector_number irq, |
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| 68 | const Pin pins[TWI_AMOUNT_PINS] |
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| 69 | ); |
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| 70 | |
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| 71 | #ifdef __cplusplus |
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| 72 | } |
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| 73 | #endif /* __cplusplus */ |
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| 74 | |
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| 75 | #endif /* LIBBSP_ARM_ATSAM_ATSAM_I2C_H */ |
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