1 /*
2 * Copyright (c) 2015, 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.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 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(spi_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
62 #if (configSUPPORT_STATIC_ALLOCATION == 1)
63 handle->event = xSemaphoreCreateBinaryStatic(&handle->semaphoreBuffer);
64 #else
65 handle->event = xSemaphoreCreateBinary();
66 #endif
67 if (handle->event == NULL)
68 {
69 vSemaphoreDelete(handle->mutex);
70 return kStatus_Fail;
71 }
72
73 handle->base = base;
74
75 SPI_MasterInit(handle->base, masterConfig, srcClock_Hz);
76 SPI_MasterTransferCreateHandle(handle->base, &handle->drv_handle, SPI_RTOS_Callback, (void *)handle);
77
78 return kStatus_Success;
79 }
80
81 /*!
82 * brief Deinitializes the SPI.
83 *
84 * This function deinitializes the SPI module and related RTOS context.
85 *
86 * param handle The RTOS SPI handle.
87 */
SPI_RTOS_Deinit(spi_rtos_handle_t * handle)88 status_t SPI_RTOS_Deinit(spi_rtos_handle_t *handle)
89 {
90 SPI_Deinit(handle->base);
91 vSemaphoreDelete(handle->event);
92 vSemaphoreDelete(handle->mutex);
93
94 return kStatus_Success;
95 }
96
97 /*!
98 * brief Performs SPI transfer.
99 *
100 * This function performs an SPI transfer according to data given in the transfer structure.
101 *
102 * param handle The RTOS SPI handle.
103 * param transfer Structure specifying the transfer parameters.
104 * return status of the operation.
105 */
SPI_RTOS_Transfer(spi_rtos_handle_t * handle,spi_transfer_t * transfer)106 status_t SPI_RTOS_Transfer(spi_rtos_handle_t *handle, spi_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_SPI_Busy;
114 }
115
116 status = SPI_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 if (xSemaphoreTake(handle->event, portMAX_DELAY) != pdTRUE)
125 {
126 return kStatus_SPI_Error;
127 }
128
129 /* Retrieve status before releasing mutex */
130 status = handle->async_status;
131
132 /* Unlock resource mutex */
133 (void)xSemaphoreGive(handle->mutex);
134
135 /* Translate status of underlying driver */
136 if (status == kStatus_SPI_Idle)
137 {
138 status = kStatus_Success;
139 }
140
141 return status;
142 }
143
