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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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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22 | #include <rtems/thread.h> |
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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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58 | uint32_t output_clock; |
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59 | bool read; |
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60 | rtems_binary_semaphore sem; |
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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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