1 /*
2 * Copyright (c) 2015, Freescale Semiconductor, Inc.
3 * Copyright 2016-2019 NXP
4 * All rights reserved.
5 *
6 * SPDX-License-Identifier: BSD-3-Clause
7 */
8
9 #include "fsl_i2c_freertos.h"
10
11 /* Component ID definition, used by tools. */
12 #ifndef FSL_COMPONENT_ID
13 #define FSL_COMPONENT_ID "platform.drivers.i2c_freertos"
14 #endif
15
I2C_RTOS_Callback(I2C_Type * base,i2c_master_handle_t * drv_handle,status_t status,void * userData)16 static void I2C_RTOS_Callback(I2C_Type *base, i2c_master_handle_t *drv_handle, status_t status, void *userData)
17 {
18 i2c_rtos_handle_t *handle = (i2c_rtos_handle_t *)userData;
19 BaseType_t reschedule = pdFALSE;
20 handle->async_status = status;
21 (void)xSemaphoreGiveFromISR(handle->semaphore, &reschedule);
22 portYIELD_FROM_ISR(reschedule);
23 }
24
25 /*!
26 * brief Initializes I2C.
27 *
28 * This function initializes the I2C module and the related RTOS context.
29 *
30 * param handle The RTOS I2C handle, the pointer to an allocated space for RTOS context.
31 * param base The pointer base address of the I2C instance to initialize.
32 * param masterConfig The configuration structure to set-up I2C in master mode.
33 * param srcClock_Hz The frequency of an input clock of the I2C module.
34 * return status of the operation.
35 */
I2C_RTOS_Init(i2c_rtos_handle_t * handle,I2C_Type * base,const i2c_master_config_t * masterConfig,uint32_t srcClock_Hz)36 status_t I2C_RTOS_Init(i2c_rtos_handle_t *handle,
37 I2C_Type *base,
38 const i2c_master_config_t *masterConfig,
39 uint32_t srcClock_Hz)
40 {
41 if (handle == NULL)
42 {
43 return kStatus_InvalidArgument;
44 }
45
46 if (base == NULL)
47 {
48 return kStatus_InvalidArgument;
49 }
50
51 (void)memset(handle, 0, sizeof(i2c_rtos_handle_t));
52 #if (configSUPPORT_STATIC_ALLOCATION == 1)
53 handle->mutex = xSemaphoreCreateMutexStatic(&handle->mutexBuffer);
54 #else
55 handle->mutex = xSemaphoreCreateMutex();
56 #endif
57 if (handle->mutex == NULL)
58 {
59 return kStatus_Fail;
60 }
61 #if (configSUPPORT_STATIC_ALLOCATION == 1)
62 handle->semaphore = xSemaphoreCreateBinaryStatic(&handle->semaphoreBuffer);
63 #else
64 handle->semaphore = xSemaphoreCreateBinary();
65 #endif
66 if (handle->semaphore == NULL)
67 {
68 vSemaphoreDelete(handle->mutex);
69 return kStatus_Fail;
70 }
71
72 handle->base = base;
73
74 I2C_MasterInit(handle->base, masterConfig, srcClock_Hz);
75 I2C_MasterTransferCreateHandle(base, &handle->drv_handle, I2C_RTOS_Callback, (void *)handle);
76
77 return kStatus_Success;
78 }
79
80 /*!
81 * brief Deinitializes the I2C.
82 *
83 * This function deinitializes the I2C module and the related RTOS context.
84 *
85 * param handle The RTOS I2C handle.
86 */
I2C_RTOS_Deinit(i2c_rtos_handle_t * handle)87 status_t I2C_RTOS_Deinit(i2c_rtos_handle_t *handle)
88 {
89 I2C_MasterDeinit(handle->base);
90
91 vSemaphoreDelete(handle->semaphore);
92 vSemaphoreDelete(handle->mutex);
93
94 return kStatus_Success;
95 }
96
97 /*!
98 * brief Performs the I2C transfer.
99 *
100 * This function performs the I2C transfer according to the data given in the transfer structure.
101 *
102 * param handle The RTOS I2C handle.
103 * param transfer A structure specifying the transfer parameters.
104 * return status of the operation.
105 */
I2C_RTOS_Transfer(i2c_rtos_handle_t * handle,i2c_master_transfer_t * transfer)106 status_t I2C_RTOS_Transfer(i2c_rtos_handle_t *handle, i2c_master_transfer_t *transfer)
107 {
108 status_t status;
109
110 /* Lock resource mutex */
111 if (xSemaphoreTake(handle->mutex, portMAX_DELAY) != pdTRUE)
112 {
113 return kStatus_I2C_Busy;
114 }
115
116 status = I2C_MasterTransferNonBlocking(handle->base, &handle->drv_handle, transfer);
117 if (status != kStatus_Success)
118 {
119 (void)xSemaphoreGive(handle->mutex);
120 return status;
121 }
122
123 /* Wait for transfer to finish */
124 (void)xSemaphoreTake(handle->semaphore, portMAX_DELAY);
125
126 /* Unlock resource mutex */
127 (void)xSemaphoreGive(handle->mutex);
128
129 /* Return status captured by callback function */
130 return handle->async_status;
131 }
132
