1 /*
2 * Copyright (c) 2016, Freescale Semiconductor, Inc.
3 * Copyright 2016-2017 NXP
4 * All rights reserved.
5 *
6 * SPDX-License-Identifier: BSD-3-Clause
7 */
8
9 #include "fsl_spi_freertos.h"
10
11 /* Component ID definition, used by tools. */
12 #ifndef FSL_COMPONENT_ID
13 #define FSL_COMPONENT_ID "platform.drivers.flexcomm_spi_freertos"
14 #endif
15
SPI_RTOS_Callback(SPI_Type * base,spi_master_handle_t * drv_handle,status_t status,void * userData)16 static void SPI_RTOS_Callback(SPI_Type *base, spi_master_handle_t *drv_handle, status_t status, void *userData)
17 {
18 spi_rtos_handle_t *handle = (spi_rtos_handle_t *)userData;
19 BaseType_t reschedule = pdFALSE;
20 handle->async_status = status;
21 (void)xSemaphoreGiveFromISR(handle->event, &reschedule);
22 portYIELD_FROM_ISR(reschedule);
23 }
24
25 /*!
26 * brief Initializes SPI.
27 *
28 * This function initializes the SPI module and related RTOS context.
29 *
30 * param handle The RTOS SPI handle, the pointer to an allocated space for RTOS context.
31 * param base The pointer base address of the SPI instance to initialize.
32 * param masterConfig Configuration structure to set-up SPI in master mode.
33 * param srcClock_Hz Frequency of input clock of the SPI module.
34 * return status of the operation.
35 */
SPI_RTOS_Init(spi_rtos_handle_t * handle,SPI_Type * base,const spi_master_config_t * masterConfig,uint32_t srcClock_Hz)36 status_t SPI_RTOS_Init(spi_rtos_handle_t *handle,
37 SPI_Type *base,
38 const spi_master_config_t *masterConfig,
39 uint32_t srcClock_Hz)
40 {
41 status_t status;
42
43 if (handle == NULL)
44 {
45 return kStatus_InvalidArgument;
46 }
47
48 if (base == NULL)
49 {
50 return kStatus_InvalidArgument;
51 }
52
53 (void)memset(handle, 0, sizeof(spi_rtos_handle_t));
54
55 handle->mutex = xSemaphoreCreateMutex();
56 if (handle->mutex == NULL)
57 {
58 return kStatus_Fail;
59 }
60
61 handle->event = xSemaphoreCreateBinary();
62 if (handle->event == NULL)
63 {
64 vSemaphoreDelete(handle->mutex);
65 return kStatus_Fail;
66 }
67
68 handle->base = base;
69
70 (void)SPI_MasterInit(handle->base, masterConfig, srcClock_Hz);
71 status = SPI_MasterTransferCreateHandle(handle->base, &handle->drv_handle, SPI_RTOS_Callback, (void *)handle);
72
73 return status;
74 }
75
76 /*!
77 * brief Deinitializes the SPI.
78 *
79 * This function deinitializes the SPI module and related RTOS context.
80 *
81 * param handle The RTOS SPI handle.
82 */
SPI_RTOS_Deinit(spi_rtos_handle_t * handle)83 status_t SPI_RTOS_Deinit(spi_rtos_handle_t *handle)
84 {
85 SPI_Deinit(handle->base);
86 vSemaphoreDelete(handle->event);
87 vSemaphoreDelete(handle->mutex);
88
89 return kStatus_Success;
90 }
91
92 /*!
93 * brief Performs SPI transfer.
94 *
95 * This function performs an SPI transfer according to data given in the transfer structure.
96 *
97 * param handle The RTOS SPI handle.
98 * param transfer Structure specifying the transfer parameters.
99 * return status of the operation.
100 */
SPI_RTOS_Transfer(spi_rtos_handle_t * handle,spi_transfer_t * transfer)101 status_t SPI_RTOS_Transfer(spi_rtos_handle_t *handle, spi_transfer_t *transfer)
102 {
103 status_t status;
104
105 /* Lock resource mutex */
106 if (xSemaphoreTake(handle->mutex, portMAX_DELAY) != pdTRUE)
107 {
108 return kStatus_SPI_Busy;
109 }
110
111 /* Initiate transfer */
112 status = SPI_MasterTransferNonBlocking(handle->base, &handle->drv_handle, transfer);
113 if (status != kStatus_Success)
114 {
115 (void)xSemaphoreGive(handle->mutex);
116 return status;
117 }
118
119 /* Wait for transfer to finish */
120 if (xSemaphoreTake(handle->event, portMAX_DELAY) != pdTRUE)
121 {
122 return kStatus_SPI_Error;
123 }
124
125 /* Retrieve status before releasing mutex */
126 status = handle->async_status;
127
128 /* Unlock resource mutex */
129 (void)xSemaphoreGive(handle->mutex);
130
131 /* Translate status of underlying driver */
132 if (status == kStatus_SPI_Idle)
133 {
134 status = kStatus_Success;
135 }
136
137 return status;
138 }
139
