Contiki-NG
LPSTK_fxns.c
1/*
2 * Copyright (c) 2018-2019, Texas Instruments Incorporated
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * * Neither the name of Texas Instruments Incorporated nor the names of
17 * its contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * ======== LPSTK_fxns.c ========
35 * This file contains the board-specific initialization functions, and
36 * RF callback function for antenna switching.
37 */
38
39#include <stdbool.h>
40#include <stddef.h>
41#include <stdint.h>
42
43#include <ti/devices/DeviceFamily.h>
44#include DeviceFamily_constructPath(driverlib/ioc.h)
45#include DeviceFamily_constructPath(driverlib/cpu.h)
46#include <ti/drivers/rf/RF.h>
47#include <ti/drivers/pin/PINCC26XX.h>
48
49#include <ti/drivers/Board.h>
50
51#include "Board.h"
52
53
54/*
55 * ======== LPSTK_sendExtFlashByte ========
56 */
57void LPSTK_sendExtFlashByte(PIN_Handle pinHandle, uint8_t byte)
58{
59 uint8_t i;
60
61 /* SPI Flash CS */
62 PIN_setOutputValue(pinHandle, IOID_20, 0);
63
64 for (i = 0; i < 8; i++) {
65 PIN_setOutputValue(pinHandle, IOID_10, 0); /* SPI Flash CLK */
66
67 /* SPI Flash MOSI */
68 PIN_setOutputValue(pinHandle, IOID_9, (byte >> (7 - i)) & 0x01);
69 PIN_setOutputValue(pinHandle, IOID_10, 1); /* SPI Flash CLK */
70
71 /*
72 * Waste a few cycles to keep the CLK high for at
73 * least 45% of the period.
74 * 3 cycles per loop: 8 loops @ 48 Mhz = 0.5 us.
75 */
76 CPUdelay(8);
77 }
78
79 PIN_setOutputValue(pinHandle, IOID_10, 0); /* CLK */
80 PIN_setOutputValue(pinHandle, IOID_20, 1); /* CS */
81
82 /*
83 * Keep CS high at least 40 us
84 * 3 cycles per loop: 700 loops @ 48 Mhz ~= 44 us
85 */
86 CPUdelay(700);
87}
88
89/*
90 * ======== LPSTK_wakeUpExtFlash ========
91 */
93{
94 PIN_Config extFlashPinTable[] = {
95 /* SPI Flash CS */
96 IOID_20 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL |
97 PIN_INPUT_DIS | PIN_DRVSTR_MED,
98 PIN_TERMINATE
99 };
100 PIN_State extFlashPinState;
101 PIN_Handle extFlashPinHandle = PIN_open(&extFlashPinState, extFlashPinTable);
102
103 /*
104 * To wake up we need to toggle the chip select at
105 * least 20 ns and ten wait at least 35 us.
106 */
107
108 /* Toggle chip select for ~20ns to wake ext. flash */
109 PIN_setOutputValue(extFlashPinHandle, IOID_20, 0);
110 /* 3 cycles per loop: 1 loop @ 48 Mhz ~= 62 ns */
111 CPUdelay(1);
112 PIN_setOutputValue(extFlashPinHandle, IOID_20, 1);
113 /* 3 cycles per loop: 560 loops @ 48 Mhz ~= 35 us */
114 CPUdelay(560);
115
116 PIN_close(extFlashPinHandle);
117}
118
119/*
120 * ======== LPSTK_shutDownExtFlash ========
121 */
123{
124 /*
125 * To be sure we are putting the flash into sleep and not waking it,
126 * we first have to make a wake up call
127 */
129
130 PIN_Config extFlashPinTable[] = {
131 /* SPI Flash CS*/
132 IOID_20 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL |
133 PIN_INPUT_DIS | PIN_DRVSTR_MED,
134 /* SPI Flash CLK */
135 IOID_10 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL |
136 PIN_INPUT_DIS | PIN_DRVSTR_MED,
137 /* SPI Flash MOSI */
138 IOID_9 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL |
139 PIN_INPUT_DIS | PIN_DRVSTR_MED,
140 /* SPI Flash MISO */
141 IOID_8 | PIN_INPUT_EN | PIN_PULLDOWN,
142 PIN_TERMINATE
143 };
144 PIN_State extFlashPinState;
145 PIN_Handle extFlashPinHandle = PIN_open(&extFlashPinState, extFlashPinTable);
146
147 uint8_t extFlashShutdown = 0xB9;
148
149 LPSTK_sendExtFlashByte(extFlashPinHandle, extFlashShutdown);
150
151 PIN_close(extFlashPinHandle);
152}
153
154/*
155 * ======== Board_initHook ========
156 * Called by Board_init() to perform board-specific initialization.
157 */
158void Board_initHook()
159{
161}
void LPSTK_shutDownExtFlash(void)
Shut down the external flash present on the board files.
Definition: LPSTK_fxns.c:122
void LPSTK_wakeUpExtFlash(void)
Wake up the external flash present on the board files.
Definition: LPSTK_fxns.c:92