1 /*
2 * Copyright (c) 2016, 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.flexcomm_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 Configuration structure to set-up I2C in master mode.
33 * param srcClock_Hz Frequency of 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
53 handle->mutex = xSemaphoreCreateMutex();
54 if (handle->mutex == NULL)
55 {
56 return kStatus_Fail;
57 }
58
59 handle->semaphore = xSemaphoreCreateBinary();
60 if (handle->semaphore == NULL)
61 {
62 vSemaphoreDelete(handle->mutex);
63 return kStatus_Fail;
64 }
65
66 handle->base = base;
67
68 I2C_MasterInit(handle->base, masterConfig, srcClock_Hz);
69 I2C_MasterTransferCreateHandle(base, &handle->drv_handle, I2C_RTOS_Callback, (void *)handle);
70
71 return kStatus_Success;
72 }
73
74 /*!
75 * brief Deinitializes the I2C.
76 *
77 * This function deinitializes the I2C module and the related RTOS context.
78 *
79 * param handle The RTOS I2C handle.
80 */
I2C_RTOS_Deinit(i2c_rtos_handle_t * handle)81 status_t I2C_RTOS_Deinit(i2c_rtos_handle_t *handle)
82 {
83 I2C_MasterDeinit(handle->base);
84
85 vSemaphoreDelete(handle->semaphore);
86 vSemaphoreDelete(handle->mutex);
87
88 return kStatus_Success;
89 }
90
91 /*!
92 * brief Performs I2C transfer.
93 *
94 * This function performs an I2C transfer according to data given in the transfer structure.
95 *
96 * param handle The RTOS I2C handle.
97 * param transfer Structure specifying the transfer parameters.
98 * return status of the operation.
99 */
I2C_RTOS_Transfer(i2c_rtos_handle_t * handle,i2c_master_transfer_t * transfer)100 status_t I2C_RTOS_Transfer(i2c_rtos_handle_t *handle, i2c_master_transfer_t *transfer)
101 {
102 status_t status;
103
104 /* Lock resource mutex */
105 if (xSemaphoreTake(handle->mutex, portMAX_DELAY) != pdTRUE)
106 {
107 return kStatus_I2C_Busy;
108 }
109
110 status = I2C_MasterTransferNonBlocking(handle->base, &handle->drv_handle, transfer);
111 if (status != kStatus_Success)
112 {
113 (void)xSemaphoreGive(handle->mutex);
114 return status;
115 }
116
117 /* Wait for transfer to finish */
118 (void)xSemaphoreTake(handle->semaphore, portMAX_DELAY);
119
120 /* Unlock resource mutex */
121 (void)xSemaphoreGive(handle->mutex);
122
123 /* Return status captured by callback function */
124 return handle->async_status;
125 }
126
