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[/] [neorv32/] [trunk/] [sw/] [lib/] [source/] [neorv32_wdt.c] - Blame information for rev 63

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// #################################################################################################
// # << NEORV32: neorv32_wdt.c - Watchdog Timer (WDT) HW Driver >>                                 #
// # ********************************************************************************************* #
// # BSD 3-Clause License                                                                          #
// #                                                                                               #
// # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     #
// #                                                                                               #
// # Redistribution and use in source and binary forms, with or without modification, are          #
// # permitted provided that the following conditions are met:                                     #
// #                                                                                               #
// # 1. Redistributions of source code must retain the above copyright notice, this list of        #
// #    conditions and the following disclaimer.                                                   #
// #                                                                                               #
// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of     #
// #    conditions and the following disclaimer in the documentation and/or other materials        #
// #    provided with the distribution.                                                            #
// #                                                                                               #
// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to  #
// #    endorse or promote products derived from this software without specific prior written      #
// #    permission.                                                                                #
// #                                                                                               #
// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS   #
// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF               #
// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE    #
// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,     #
// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED    #
// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     #
// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED  #
// # OF THE POSSIBILITY OF SUCH DAMAGE.                                                            #
// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #
// #################################################################################################
 
 
/**********************************************************************//**
 * @file neorv32_wdt.c
 * @author Stephan Nolting
 * @brief Watchdog Timer (WDT) HW driver source file.
 *
 * @note These functions should only be used if the WDT unit was synthesized (IO_WDT_EN = true).
 **************************************************************************/
 
#include "neorv32.h"
#include "neorv32_wdt.h"
 
 
/**********************************************************************//**
 * Check if WDT unit was synthesized.
 *
 * @return 0 if WDT was not synthesized, 1 if WDT is available.
 **************************************************************************/
int neorv32_wdt_available(void) {
 
  if (SYSINFO_FEATURES & (1 << SYSINFO_FEATURES_IO_WDT)) {
    return 1;
  }
  else {
    return 0;
  }
}
 
 
/**********************************************************************//**
 * Configure and enable watchdog timer. The WDT control register bits are listed in #NEORV32_WDT_CT_enum.
 *
 * @param[in] prsc Clock prescaler to select timeout interval. See #NEORV32_CLOCK_PRSC_enum.
 * @param[in] mode Trigger system reset on timeout when 1, trigger interrupt on timeout when 0.
 * @param[in] lock Control register will be locked when 1 (until next reset).
 **************************************************************************/
void neorv32_wdt_setup(uint8_t prsc, uint8_t mode, uint8_t lock) {
 
  WDT_CT = (1 << WDT_CT_RESET); // reset WDT counter
 
  uint32_t prsc_int = (uint32_t)(prsc & 0x07);
  prsc_int = prsc_int << WDT_CT_CLK_SEL0;
 
  uint32_t mode_int = (uint32_t)(mode & 0x01);
  mode_int = mode_int << WDT_CT_MODE;
 
  uint32_t lock_int = (uint32_t)(lock & 0x01);
  lock_int = lock_int << WDT_CT_LOCK;
 
  const uint32_t enable = (uint32_t)(1 << WDT_CT_EN);
 
  // update WDT control register
  WDT_CT = enable | mode_int | prsc_int | lock_int;
}
 
 
/**********************************************************************//**
 * Disable watchdog timer.
 *
 * @return Returns 0 if WDT is really deactivated, -1 otherwise.
 **************************************************************************/
int neorv32_wdt_disable(void) {
 
  WDT_CT = 0;
 
  // check if wdt is really off
  if (WDT_CT & (1 << WDT_CT_EN)) {
    return -1; // WDT still active
  }
  else {
    return 0;
  }
}
 
 
/**********************************************************************//**
 * Reset (running) watchdog.
 **************************************************************************/
void neorv32_wdt_reset(void) {
 
  WDT_CT = WDT_CT | (1 << WDT_CT_RESET);
}
 
 
/**********************************************************************//**
 * Get cause of last system reset.
 *
 * @return Cause of last reset/IRQ (0: external reset, 1: watchdog timeout).
 **************************************************************************/
int neorv32_wdt_get_cause(void) {
 
  if (WDT_CT & (1 << WDT_CT_RCAUSE)) { // reset caused by watchdog
    return 1;
  }
  else { // external reset
    return 0;
  }
}
 
 
/**********************************************************************//**
 * Force immediate watchdog action (reset/IRQ).
 **************************************************************************/
void neorv32_wdt_force(void) {
 
  WDT_CT = WDT_CT | (1 << WDT_CT_FORCE);
}

Line No.	Rev	Author	Line
1	2	zero_gravi	`// #################################################################################################`
2			`// # << NEORV32: neorv32_wdt.c - Watchdog Timer (WDT) HW Driver >> #`
3			`// # ********************************************************************************************* #`
4			`// # BSD 3-Clause License #`
5			`// # #`
6	44	zero_gravi	`// # Copyright (c) 2021, Stephan Nolting. All rights reserved. #`
7	2	zero_gravi	`// # #`
8			`// # Redistribution and use in source and binary forms, with or without modification, are #`
9			`// # permitted provided that the following conditions are met: #`
10			`// # #`
11			`// # 1. Redistributions of source code must retain the above copyright notice, this list of #`
12			`// # conditions and the following disclaimer. #`
13			`// # #`
14			`// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #`
15			`// # conditions and the following disclaimer in the documentation and/or other materials #`
16			`// # provided with the distribution. #`
17			`// # #`
18			`// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #`
19			`// # endorse or promote products derived from this software without specific prior written #`
20			`// # permission. #`
21			`// # #`
22			`// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #`
23			`// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #`
24			`// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #`
25			`// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #`
26			`// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #`
27			`// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #`
28			`// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #`
29			`// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #`
30			`// # OF THE POSSIBILITY OF SUCH DAMAGE. #`
31			`// # ********************************************************************************************* #`
32			`// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #`
33			`// #################################################################################################`
34
35
36			`/********************************************************************//`
37			`* @file neorv32_wdt.c`
38			`* @author Stephan Nolting`
39			`* @brief Watchdog Timer (WDT) HW driver source file.`
40			`*`
41	44	zero_gravi	`* @note These functions should only be used if the WDT unit was synthesized (IO_WDT_EN = true).`
42	2	zero_gravi	`**************************************************************************/`
43
44			`#include "neorv32.h"`
45			`#include "neorv32_wdt.h"`
46
47
48			`/********************************************************************//`
49			`* Check if WDT unit was synthesized.`
50			`*`
51			`* @return 0 if WDT was not synthesized, 1 if WDT is available.`
52			`**************************************************************************/`
53			`int neorv32_wdt_available(void) {`
54
55	12	zero_gravi	`if (SYSINFO_FEATURES & (1 << SYSINFO_FEATURES_IO_WDT)) {`
56	2	zero_gravi	`return 1;`
57			`}`
58			`else {`
59			`return 0;`
60			`}`
61			`}`
62
63
64			`/********************************************************************//`
65	47	zero_gravi	`* Configure and enable watchdog timer. The WDT control register bits are listed in #NEORV32_WDT_CT_enum.`
66	2	zero_gravi	`*`
67	61	zero_gravi	`* @param[in] prsc Clock prescaler to select timeout interval. See #NEORV32_CLOCK_PRSC_enum.`
68	47	zero_gravi	`* @param[in] mode Trigger system reset on timeout when 1, trigger interrupt on timeout when 0.`
69	61	zero_gravi	`* @param[in] lock Control register will be locked when 1 (until next reset).`
70	2	zero_gravi	`**************************************************************************/`
71	47	zero_gravi	`void neorv32_wdt_setup(uint8_t prsc, uint8_t mode, uint8_t lock) {`
72	2	zero_gravi
73	47	zero_gravi	`WDT_CT = (1 << WDT_CT_RESET); // reset WDT counter`
74	2	zero_gravi
75	47	zero_gravi	`uint32_t prsc_int = (uint32_t)(prsc & 0x07);`
76			`prsc_int = prsc_int << WDT_CT_CLK_SEL0;`
77	2	zero_gravi
78	47	zero_gravi	`uint32_t mode_int = (uint32_t)(mode & 0x01);`
79			`mode_int = mode_int << WDT_CT_MODE;`
80	2	zero_gravi
81	47	zero_gravi	`uint32_t lock_int = (uint32_t)(lock & 0x01);`
82			`lock_int = lock_int << WDT_CT_LOCK;`
83	2	zero_gravi
84	47	zero_gravi	`const uint32_t enable = (uint32_t)(1 << WDT_CT_EN);`
85
86			`// update WDT control register`
87			`WDT_CT = enable \| mode_int \| prsc_int \| lock_int;`
88	2	zero_gravi	`}`
89
90
91			`/********************************************************************//`
92			`* Disable watchdog timer.`
93	47	zero_gravi	`*`
94	61	zero_gravi	`* @return Returns 0 if WDT is really deactivated, -1 otherwise.`
95	2	zero_gravi	`**************************************************************************/`
96	47	zero_gravi	`int neorv32_wdt_disable(void) {`
97
98			`WDT_CT = 0;`
99	2	zero_gravi
100	47	zero_gravi	`// check if wdt is really off`
101			`if (WDT_CT & (1 << WDT_CT_EN)) {`
102			`return -1; // WDT still active`
103			`}`
104			`else {`
105			`return 0;`
106			`}`
107	2	zero_gravi	`}`
108
109
110			`/********************************************************************//`
111			`* Reset (running) watchdog.`
112			`**************************************************************************/`
113			`void neorv32_wdt_reset(void) {`
114
115	63	zero_gravi	`WDT_CT = WDT_CT \| (1 << WDT_CT_RESET);`
116	2	zero_gravi	`}`
117
118
119			`/********************************************************************//`
120	47	zero_gravi	`* Get cause of last system reset.`
121	2	zero_gravi	`*`
122	47	zero_gravi	`* @return Cause of last reset/IRQ (0: external reset, 1: watchdog timeout).`
123	2	zero_gravi	`**************************************************************************/`
124	47	zero_gravi	`int neorv32_wdt_get_cause(void) {`
125	2	zero_gravi
126	47	zero_gravi	`if (WDT_CT & (1 << WDT_CT_RCAUSE)) { // reset caused by watchdog`
127			`return 1;`
128	2	zero_gravi	`}`
129			`else { // external reset`
130	47	zero_gravi	`return 0;`
131	2	zero_gravi	`}`
132			`}`
133
134
135			`/********************************************************************//`
136	47	zero_gravi	`* Force immediate watchdog action (reset/IRQ).`
137	2	zero_gravi	`**************************************************************************/`
138			`void neorv32_wdt_force(void) {`
139
140	47	zero_gravi	`WDT_CT = WDT_CT \| (1 << WDT_CT_FORCE);`
141	2	zero_gravi	`}`

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[/] [neorv32/] [trunk/] [sw/] [lib/] [source/] [neorv32_wdt.c] - Blame information for rev 63