ON Semiconductor / mbed-os

5.2.1 - Updated I2C files

Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_Maxim/TARGET_MAX32600/us_ticker.c@1:f30bdcd2b33b, 2017-02-27 (annotated)

Committer:
jacobjohnson
Date:
Mon Feb 27 17:45:05 2017 +0000
Revision:
1:f30bdcd2b33b
Parent:
0:098463de4c5d 
changed the inputscale from 1 to 7 in analogin_api.c.  This will need to be changed later, and accessed from the main level, but for now this allows the  adc to read a value from 0 to 3.7V, instead of just up to 1V.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /*******************************************************************************
group-onsemi 0:098463de4c5d 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Permission is hereby granted, free of charge, to any person obtaining a
group-onsemi 0:098463de4c5d 5 * copy of this software and associated documentation files (the "Software"),
group-onsemi 0:098463de4c5d 6 * to deal in the Software without restriction, including without limitation
group-onsemi 0:098463de4c5d 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
group-onsemi 0:098463de4c5d 8 * and/or sell copies of the Software, and to permit persons to whom the
group-onsemi 0:098463de4c5d 9 * Software is furnished to do so, subject to the following conditions:
group-onsemi 0:098463de4c5d 10 *
group-onsemi 0:098463de4c5d 11 * The above copyright notice and this permission notice shall be included
group-onsemi 0:098463de4c5d 12 * in all copies or substantial portions of the Software.
group-onsemi 0:098463de4c5d 13 *
group-onsemi 0:098463de4c5d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
group-onsemi 0:098463de4c5d 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
group-onsemi 0:098463de4c5d 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
group-onsemi 0:098463de4c5d 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
group-onsemi 0:098463de4c5d 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
group-onsemi 0:098463de4c5d 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
group-onsemi 0:098463de4c5d 20 * OTHER DEALINGS IN THE SOFTWARE.
group-onsemi 0:098463de4c5d 21 *
group-onsemi 0:098463de4c5d 22 * Except as contained in this notice, the name of Maxim Integrated
group-onsemi 0:098463de4c5d 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
group-onsemi 0:098463de4c5d 24 * Products, Inc. Branding Policy.
group-onsemi 0:098463de4c5d 25 *
group-onsemi 0:098463de4c5d 26 * The mere transfer of this software does not imply any licenses
group-onsemi 0:098463de4c5d 27 * of trade secrets, proprietary technology, copyrights, patents,
group-onsemi 0:098463de4c5d 28 * trademarks, maskwork rights, or any other form of intellectual
group-onsemi 0:098463de4c5d 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
group-onsemi 0:098463de4c5d 30 * ownership rights.
group-onsemi 0:098463de4c5d 31 *******************************************************************************
group-onsemi 0:098463de4c5d 32 */
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 #include "mbed_error.h"
group-onsemi 0:098463de4c5d 35 #include "us_ticker_api.h"
group-onsemi 0:098463de4c5d 36 #include "PeripheralNames.h"
group-onsemi 0:098463de4c5d 37 #include "tmr_regs.h"
group-onsemi 0:098463de4c5d 38
group-onsemi 0:098463de4c5d 39 #define US_TIMER MXC_TMR0
group-onsemi 0:098463de4c5d 40 #define US_TIMER_IRQn TMR0_IRQn
group-onsemi 0:098463de4c5d 41
group-onsemi 0:098463de4c5d 42 static int us_ticker_inited = 0;
group-onsemi 0:098463de4c5d 43 static uint32_t ticks_per_us;
group-onsemi 0:098463de4c5d 44 static uint32_t tick_win;
group-onsemi 0:098463de4c5d 45 static volatile uint64_t current_cnt; // Hold the current ticks
group-onsemi 0:098463de4c5d 46 static volatile uint64_t event_cnt; // Holds the value of the next event
group-onsemi 0:098463de4c5d 47
group-onsemi 0:098463de4c5d 48 #define ticks_to_us(ticks) ((ticks) / ticks_per_us);
group-onsemi 0:098463de4c5d 49 #define MAX_TICK_VAL ((uint64_t)0xFFFFFFFF * ticks_per_us)
group-onsemi 0:098463de4c5d 50
group-onsemi 0:098463de4c5d 51 //******************************************************************************
group-onsemi 0:098463de4c5d 52 static inline void inc_current_cnt(uint32_t inc) {
group-onsemi 0:098463de4c5d 53
group-onsemi 0:098463de4c5d 54 // Overflow the ticker when the us ticker overflows
group-onsemi 0:098463de4c5d 55 current_cnt += inc;
group-onsemi 0:098463de4c5d 56 if (current_cnt > MAX_TICK_VAL) {
group-onsemi 0:098463de4c5d 57 current_cnt -= (MAX_TICK_VAL + 1);
group-onsemi 0:098463de4c5d 58 }
group-onsemi 0:098463de4c5d 59 }
group-onsemi 0:098463de4c5d 60
group-onsemi 0:098463de4c5d 61 //******************************************************************************
group-onsemi 0:098463de4c5d 62 static inline int event_passed(uint64_t current, uint64_t event) {
group-onsemi 0:098463de4c5d 63
group-onsemi 0:098463de4c5d 64 // Determine if the event has already happened.
group-onsemi 0:098463de4c5d 65 // If the event is behind the current ticker, within a window,
group-onsemi 0:098463de4c5d 66 // then the event has already happened.
group-onsemi 0:098463de4c5d 67 if (((current < tick_win) && ((event < current) ||
group-onsemi 0:098463de4c5d 68 (event > (MAX_TICK_VAL - (tick_win - current))))) ||
group-onsemi 0:098463de4c5d 69 ((event < current) && (event > (current - tick_win)))) {
group-onsemi 0:098463de4c5d 70 return 1;
group-onsemi 0:098463de4c5d 71 }
group-onsemi 0:098463de4c5d 72
group-onsemi 0:098463de4c5d 73 return 0;
group-onsemi 0:098463de4c5d 74 }
group-onsemi 0:098463de4c5d 75
group-onsemi 0:098463de4c5d 76 //******************************************************************************
group-onsemi 0:098463de4c5d 77 static inline uint64_t event_diff(uint64_t current, uint64_t event) {
group-onsemi 0:098463de4c5d 78
group-onsemi 0:098463de4c5d 79 // Check to see if the ticker will overflow before the event
group-onsemi 0:098463de4c5d 80 if(current <= event) {
group-onsemi 0:098463de4c5d 81 return (event - current);
group-onsemi 0:098463de4c5d 82 }
group-onsemi 0:098463de4c5d 83
group-onsemi 0:098463de4c5d 84 return ((MAX_TICK_VAL - current) + event);
group-onsemi 0:098463de4c5d 85 }
group-onsemi 0:098463de4c5d 86
group-onsemi 0:098463de4c5d 87 //******************************************************************************
group-onsemi 0:098463de4c5d 88 static void tmr_handler(void)
group-onsemi 0:098463de4c5d 89 {
group-onsemi 0:098463de4c5d 90 uint32_t term_cnt32 = US_TIMER->term_cnt32;
group-onsemi 0:098463de4c5d 91 US_TIMER->term_cnt32 = 0xFFFFFFFF; // reset to max value to prevent further interrupts
group-onsemi 0:098463de4c5d 92 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear interrupt
group-onsemi 0:098463de4c5d 93 NVIC_ClearPendingIRQ(US_TIMER_IRQn);
group-onsemi 0:098463de4c5d 94
group-onsemi 0:098463de4c5d 95 inc_current_cnt(term_cnt32);
group-onsemi 0:098463de4c5d 96
group-onsemi 0:098463de4c5d 97 if (event_passed(current_cnt + US_TIMER->count32, event_cnt )) {
group-onsemi 0:098463de4c5d 98 // the timestamp has expired
group-onsemi 0:098463de4c5d 99 event_cnt = 0xFFFFFFFFFFFFFFFFULL; // reset to max value
group-onsemi 0:098463de4c5d 100 us_ticker_irq_handler();
group-onsemi 0:098463de4c5d 101 } else {
group-onsemi 0:098463de4c5d 102
group-onsemi 0:098463de4c5d 103 uint64_t diff = event_diff(current_cnt, event_cnt);
group-onsemi 0:098463de4c5d 104 if (diff < (uint64_t)0xFFFFFFFF) {
group-onsemi 0:098463de4c5d 105 // the event occurs before the next overflow
group-onsemi 0:098463de4c5d 106 US_TIMER->term_cnt32 = diff;
group-onsemi 0:098463de4c5d 107
group-onsemi 0:098463de4c5d 108 // Since the timer keeps counting after the terminal value is reached, it is possible that the new
group-onsemi 0:098463de4c5d 109 // terminal value is in the past.
group-onsemi 0:098463de4c5d 110 if (US_TIMER->term_cnt32 < US_TIMER->count32) {
group-onsemi 0:098463de4c5d 111 // the timestamp has expired
group-onsemi 0:098463de4c5d 112 US_TIMER->term_cnt32 = 0xFFFFFFFF; // reset to max value to prevent further interrupts
group-onsemi 0:098463de4c5d 113 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear interrupt
group-onsemi 0:098463de4c5d 114 NVIC_ClearPendingIRQ(US_TIMER_IRQn);
group-onsemi 0:098463de4c5d 115 event_cnt = 0xFFFFFFFFFFFFFFFFULL; // reset to max value
group-onsemi 0:098463de4c5d 116 us_ticker_irq_handler();
group-onsemi 0:098463de4c5d 117 }
group-onsemi 0:098463de4c5d 118 }
group-onsemi 0:098463de4c5d 119 }
group-onsemi 0:098463de4c5d 120 }
group-onsemi 0:098463de4c5d 121
group-onsemi 0:098463de4c5d 122 //******************************************************************************
group-onsemi 0:098463de4c5d 123 void us_ticker_init(void)
group-onsemi 0:098463de4c5d 124 {
group-onsemi 0:098463de4c5d 125 if (us_ticker_inited)
group-onsemi 0:098463de4c5d 126 return;
group-onsemi 0:098463de4c5d 127 us_ticker_inited = 1;
group-onsemi 0:098463de4c5d 128
group-onsemi 0:098463de4c5d 129 current_cnt = 0;
group-onsemi 0:098463de4c5d 130 event_cnt = 0xFFFFFFFFFFFFFFFFULL; // reset to max value
group-onsemi 0:098463de4c5d 131
group-onsemi 0:098463de4c5d 132 if (SystemCoreClock <= 1000000) {
group-onsemi 0:098463de4c5d 133 error("us_ticker cannot operate at this SystemCoreClock");
group-onsemi 0:098463de4c5d 134 return;
group-onsemi 0:098463de4c5d 135 }
group-onsemi 0:098463de4c5d 136
group-onsemi 0:098463de4c5d 137 // Configure timer for 32-bit continuous mode with /1 prescaler
group-onsemi 0:098463de4c5d 138 US_TIMER->ctrl = MXC_E_TMR_MODE_CONTINUOUS << MXC_F_TMR_CTRL_MODE_POS | (0 << MXC_F_TMR_CTRL_PRESCALE_POS);
group-onsemi 0:098463de4c5d 139 ticks_per_us = SystemCoreClock / 1000000;
group-onsemi 0:098463de4c5d 140
group-onsemi 0:098463de4c5d 141 // Set the tick window to 10ms
group-onsemi 0:098463de4c5d 142 tick_win = SystemCoreClock/100;
group-onsemi 0:098463de4c5d 143
group-onsemi 0:098463de4c5d 144 // Set timer overflow to the max
group-onsemi 0:098463de4c5d 145 US_TIMER->term_cnt32 = 0xFFFFFFFF;
group-onsemi 0:098463de4c5d 146 US_TIMER->pwm_cap32 = 0xFFFFFFFF;
group-onsemi 0:098463de4c5d 147 US_TIMER->count32 = 0;
group-onsemi 0:098463de4c5d 148
group-onsemi 0:098463de4c5d 149 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear pending interrupts
group-onsemi 0:098463de4c5d 150
group-onsemi 0:098463de4c5d 151 NVIC_SetVector(US_TIMER_IRQn, (uint32_t)tmr_handler);
group-onsemi 0:098463de4c5d 152 NVIC_EnableIRQ(US_TIMER_IRQn);
group-onsemi 0:098463de4c5d 153
group-onsemi 0:098463de4c5d 154 US_TIMER->inten |= MXC_F_TMR_INTEN_TIMER0; // enable interrupts
group-onsemi 0:098463de4c5d 155 US_TIMER->ctrl |= MXC_F_TMR_CTRL_ENABLE0; // enable timer
group-onsemi 0:098463de4c5d 156 }
group-onsemi 0:098463de4c5d 157
group-onsemi 0:098463de4c5d 158 //******************************************************************************
group-onsemi 0:098463de4c5d 159 void us_ticker_deinit(void)
group-onsemi 0:098463de4c5d 160 {
group-onsemi 0:098463de4c5d 161 US_TIMER->ctrl = 0; // disable timer
group-onsemi 0:098463de4c5d 162 US_TIMER->inten = 0; // disable interrupts
group-onsemi 0:098463de4c5d 163 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear interrupts
group-onsemi 0:098463de4c5d 164 us_ticker_inited = 0;
group-onsemi 0:098463de4c5d 165 }
group-onsemi 0:098463de4c5d 166
group-onsemi 0:098463de4c5d 167 //******************************************************************************
group-onsemi 0:098463de4c5d 168 uint32_t us_ticker_read(void)
group-onsemi 0:098463de4c5d 169 {
group-onsemi 0:098463de4c5d 170 uint64_t current_cnt1, current_cnt2;
group-onsemi 0:098463de4c5d 171 uint32_t term_cnt, tmr_cnt;
group-onsemi 0:098463de4c5d 172 uint32_t intfl1, intfl2;
group-onsemi 0:098463de4c5d 173
group-onsemi 0:098463de4c5d 174 if (!us_ticker_inited)
group-onsemi 0:098463de4c5d 175 us_ticker_init();
group-onsemi 0:098463de4c5d 176
group-onsemi 0:098463de4c5d 177 // Ensure coherency between current_cnt and US_TIMER->count32
group-onsemi 0:098463de4c5d 178 do {
group-onsemi 0:098463de4c5d 179 current_cnt1 = current_cnt;
group-onsemi 0:098463de4c5d 180 intfl1 = US_TIMER->intfl;
group-onsemi 0:098463de4c5d 181 term_cnt = US_TIMER->term_cnt32;
group-onsemi 0:098463de4c5d 182 tmr_cnt = US_TIMER->count32;
group-onsemi 0:098463de4c5d 183 intfl2 = US_TIMER->intfl;
group-onsemi 0:098463de4c5d 184 current_cnt2 = current_cnt;
group-onsemi 0:098463de4c5d 185 } while ((current_cnt1 != current_cnt2) || (intfl1 != intfl2));
group-onsemi 0:098463de4c5d 186
group-onsemi 0:098463de4c5d 187 // Account for an unserviced interrupt
group-onsemi 0:098463de4c5d 188 if (intfl1) {
group-onsemi 0:098463de4c5d 189 current_cnt1 += term_cnt;
group-onsemi 0:098463de4c5d 190 }
group-onsemi 0:098463de4c5d 191
group-onsemi 0:098463de4c5d 192 current_cnt1 += tmr_cnt;
group-onsemi 0:098463de4c5d 193
group-onsemi 0:098463de4c5d 194 return (current_cnt1 / ticks_per_us);
group-onsemi 0:098463de4c5d 195 }
group-onsemi 0:098463de4c5d 196
group-onsemi 0:098463de4c5d 197 //******************************************************************************
group-onsemi 0:098463de4c5d 198 void us_ticker_set_interrupt(timestamp_t timestamp)
group-onsemi 0:098463de4c5d 199 {
group-onsemi 0:098463de4c5d 200 // Note: interrupts are disabled before this function is called.
group-onsemi 0:098463de4c5d 201
group-onsemi 0:098463de4c5d 202 US_TIMER->ctrl &= ~MXC_F_TMR_CTRL_ENABLE0; // disable timer
group-onsemi 0:098463de4c5d 203
group-onsemi 0:098463de4c5d 204 if (US_TIMER->intfl) {
group-onsemi 0:098463de4c5d 205 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear interrupt
group-onsemi 0:098463de4c5d 206 NVIC_ClearPendingIRQ(US_TIMER_IRQn);
group-onsemi 0:098463de4c5d 207 inc_current_cnt(US_TIMER->term_cnt32);
group-onsemi 0:098463de4c5d 208 }
group-onsemi 0:098463de4c5d 209
group-onsemi 0:098463de4c5d 210 // add and reset the current count value
group-onsemi 0:098463de4c5d 211 inc_current_cnt(US_TIMER->count32);
group-onsemi 0:098463de4c5d 212 US_TIMER->count32 = 0;
group-onsemi 0:098463de4c5d 213
group-onsemi 0:098463de4c5d 214 // add the number of cycles that the timer is disabled here for
group-onsemi 0:098463de4c5d 215 inc_current_cnt(200);
group-onsemi 0:098463de4c5d 216
group-onsemi 0:098463de4c5d 217 event_cnt = (uint64_t)timestamp * ticks_per_us;
group-onsemi 0:098463de4c5d 218
group-onsemi 0:098463de4c5d 219 // Check to see if the event has already passed
group-onsemi 0:098463de4c5d 220 if (!event_passed(current_cnt, event_cnt)) {
group-onsemi 0:098463de4c5d 221 uint64_t diff = event_diff(current_cnt, event_cnt);
group-onsemi 0:098463de4c5d 222 if (diff < (uint64_t)0xFFFFFFFF) {
group-onsemi 0:098463de4c5d 223 // the event occurs before the next overflow
group-onsemi 0:098463de4c5d 224 US_TIMER->term_cnt32 = diff;
group-onsemi 0:098463de4c5d 225 } else {
group-onsemi 0:098463de4c5d 226 // the event occurs after the next overflow
group-onsemi 0:098463de4c5d 227 US_TIMER->term_cnt32 = 0xFFFFFFFF; // set to max
group-onsemi 0:098463de4c5d 228 }
group-onsemi 0:098463de4c5d 229 } else {
group-onsemi 0:098463de4c5d 230 // the requested timestamp occurs in the past
group-onsemi 0:098463de4c5d 231 // set the timer up to immediately expire
group-onsemi 0:098463de4c5d 232 US_TIMER->term_cnt32 = 1;
group-onsemi 0:098463de4c5d 233 }
group-onsemi 0:098463de4c5d 234 US_TIMER->ctrl |= MXC_F_TMR_CTRL_ENABLE0; // enable timer
group-onsemi 0:098463de4c5d 235 }
group-onsemi 0:098463de4c5d 236
group-onsemi 0:098463de4c5d 237 //******************************************************************************
group-onsemi 0:098463de4c5d 238 void us_ticker_disable_interrupt(void)
group-onsemi 0:098463de4c5d 239 {
group-onsemi 0:098463de4c5d 240 // There are no more events, set timer overflow to the max
group-onsemi 0:098463de4c5d 241 US_TIMER->term_cnt32 = 0xFFFFFFFF;
group-onsemi 0:098463de4c5d 242 }
group-onsemi 0:098463de4c5d 243
group-onsemi 0:098463de4c5d 244 //******************************************************************************
group-onsemi 0:098463de4c5d 245 void us_ticker_clear_interrupt(void)
group-onsemi 0:098463de4c5d 246 {
group-onsemi 0:098463de4c5d 247 // cleared in the local handler
group-onsemi 0:098463de4c5d 248 }
group-onsemi 0:098463de4c5d 249
group-onsemi 0:098463de4c5d 250 //******************************************************************************
group-onsemi 0:098463de4c5d 251 void us_ticker_set(timestamp_t timestamp)
group-onsemi 0:098463de4c5d 252 {
group-onsemi 0:098463de4c5d 253 US_TIMER->ctrl &= ~MXC_F_TMR_CTRL_ENABLE0; // disable timer
group-onsemi 0:098463de4c5d 254 current_cnt = (uint64_t)timestamp * ticks_per_us;
group-onsemi 0:098463de4c5d 255 US_TIMER->count32 = 0;
group-onsemi 0:098463de4c5d 256 US_TIMER->term_cnt32 = 0xFFFFFFFF;
group-onsemi 0:098463de4c5d 257 US_TIMER->ctrl |= MXC_F_TMR_CTRL_ENABLE0; // enable timer
group-onsemi 0:098463de4c5d 258
group-onsemi 0:098463de4c5d 259 if (((uint64_t)timestamp * ticks_per_us) >= event_cnt) {
group-onsemi 0:098463de4c5d 260 // The next timestamp has elapsed. Trigger the interrupt to handle it.
group-onsemi 0:098463de4c5d 261 NVIC_SetPendingIRQ(US_TIMER_IRQn);
group-onsemi 0:098463de4c5d 262 }
group-onsemi 0:098463de4c5d 263 }