Contiki-NG
CC2650_LAUNCHXL_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  * =================== CC2650_LAUNCHXL_fxns.c ============================
35  * This file contains the board-specific initialization functions.
36  */
37 
38 #include <stdbool.h>
39 #include <stddef.h>
40 #include <stdint.h>
41 
42 #include <ti/devices/DeviceFamily.h>
43 #include DeviceFamily_constructPath(driverlib/ioc.h)
44 #include DeviceFamily_constructPath(driverlib/cpu.h)
45 
46 #include <ti/drivers/pin/PINCC26XX.h>
47 
48 #include <ti/drivers/Board.h>
49 
50 #include "Board.h"
51 
52 
53 /*
54  * ======== CC2650_LAUNCHXL_sendExtFlashByte ========
55  */
56 void CC2650_LAUNCHXL_sendExtFlashByte(PIN_Handle pinHandle, uint8_t byte)
57 {
58  uint8_t i;
59 
60  /* SPI Flash CS */
61  PIN_setOutputValue(pinHandle, IOID_20, 0);
62 
63  for (i = 0; i < 8; i++) {
64  PIN_setOutputValue(pinHandle, IOID_10, 0); /* SPI Flash CLK */
65 
66  /* SPI Flash MOSI */
67  PIN_setOutputValue(pinHandle, IOID_9, (byte >> (7 - i)) & 0x01);
68  PIN_setOutputValue(pinHandle, IOID_10, 1); /* SPI Flash CLK */
69 
70  /*
71  * Waste a few cycles to keep the CLK high for at
72  * least 45% of the period.
73  * 3 cycles per loop: 8 loops @ 48 Mhz = 0.5 us.
74  */
75  CPUdelay(8);
76  }
77 
78  PIN_setOutputValue(pinHandle, IOID_10, 0); /* CLK */
79  PIN_setOutputValue(pinHandle, IOID_20, 1); /* CS */
80 
81  /*
82  * Keep CS high at least 40 us
83  * 3 cycles per loop: 700 loops @ 48 Mhz ~= 44 us
84  */
85  CPUdelay(700);
86 }
87 
88 /*
89  * ======== CC2650_LAUNCHXL_wakeUpExtFlash ========
90  */
92 {
93  PIN_Config extFlashPinTable[] = {
94  /* SPI Flash CS */
95  IOID_20 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL |
96  PIN_INPUT_DIS | PIN_DRVSTR_MED,
97  PIN_TERMINATE
98  };
99  PIN_State extFlashPinState;
100  PIN_Handle extFlashPinHandle = PIN_open(&extFlashPinState, extFlashPinTable);
101 
102  /*
103  * To wake up we need to toggle the chip select at
104  * least 20 ns and ten wait at least 35 us.
105  */
106 
107  /* Toggle chip select for ~20ns to wake ext. flash */
108  PIN_setOutputValue(extFlashPinHandle, IOID_20, 0);
109  /* 3 cycles per loop: 1 loop @ 48 Mhz ~= 62 ns */
110  CPUdelay(1);
111  PIN_setOutputValue(extFlashPinHandle, IOID_20, 1);
112  /* 3 cycles per loop: 560 loops @ 48 Mhz ~= 35 us */
113  CPUdelay(560);
114 
115  PIN_close(extFlashPinHandle);
116 }
117 
118 /*
119  * ======== CC2650_LAUNCHXL_shutDownExtFlash ========
120  */
122 {
123  /*
124  * To be sure we are putting the flash into sleep and not waking it,
125  * we first have to make a wake up call
126  */
128 
129  PIN_Config extFlashPinTable[] = {
130  /* SPI Flash CS*/
131  IOID_20 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL |
132  PIN_INPUT_DIS | PIN_DRVSTR_MED,
133  /* SPI Flash CLK */
134  IOID_10 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL |
135  PIN_INPUT_DIS | PIN_DRVSTR_MED,
136  /* SPI Flash MOSI */
137  IOID_9 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL |
138  PIN_INPUT_DIS | PIN_DRVSTR_MED,
139  /* SPI Flash MISO */
140  IOID_8 | PIN_INPUT_EN | PIN_PULLDOWN,
141  PIN_TERMINATE
142  };
143  PIN_State extFlashPinState;
144  PIN_Handle extFlashPinHandle = PIN_open(&extFlashPinState, extFlashPinTable);
145 
146  uint8_t extFlashShutdown = 0xB9;
147 
148  CC2650_LAUNCHXL_sendExtFlashByte(extFlashPinHandle, extFlashShutdown);
149 
150  PIN_close(extFlashPinHandle);
151 }
152 
153 /*
154  * ======== Board_initHook ========
155  * Called by Board_init() to perform board-specific initialization.
156  */
157 void Board_initHook()
158 {
160 }
void CC2650_LAUNCHXL_shutDownExtFlash(void)
Turn off the external flash on LaunchPads.
void CC2650_LAUNCHXL_wakeUpExtFlash(void)
Wake up the external flash present on the board files.