Andy K / Mbed 2 deprecated SOWB

Satellite Observers Workbench. NOT yet complete, just published for forum posters to \"cherry pick\" pieces of code as requiered as an example.

Dependencies:   mbed

rit/rit.c@0:0a841b89d614, 2010-10-11 (annotated)

Committer:
AjK
Date:
Mon Oct 11 10:34:55 2010 +0000
Revision:
0:0a841b89d614
Totally Alpha quality as this project isn\t completed. Just publishing it as it answers many questions asked in the forums

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AjK 0:0a841b89d614 1 /****************************************************************************
AjK 0:0a841b89d614 2 * Copyright 2010 Andy Kirkham, Stellar Technologies Ltd
AjK 0:0a841b89d614 3 *
AjK 0:0a841b89d614 4 * This file is part of the Satellite Observers Workbench (SOWB).
AjK 0:0a841b89d614 5 *
AjK 0:0a841b89d614 6 * SOWB is free software: you can redistribute it and/or modify
AjK 0:0a841b89d614 7 * it under the terms of the GNU General Public License as published by
AjK 0:0a841b89d614 8 * the Free Software Foundation, either version 3 of the License, or
AjK 0:0a841b89d614 9 * (at your option) any later version.
AjK 0:0a841b89d614 10 *
AjK 0:0a841b89d614 11 * SOWB is distributed in the hope that it will be useful,
AjK 0:0a841b89d614 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
AjK 0:0a841b89d614 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
AjK 0:0a841b89d614 14 * GNU General Public License for more details.
AjK 0:0a841b89d614 15 *
AjK 0:0a841b89d614 16 * You should have received a copy of the GNU General Public License
AjK 0:0a841b89d614 17 * along with SOWB. If not, see <http://www.gnu.org/licenses/>.
AjK 0:0a841b89d614 18 *
AjK 0:0a841b89d614 19 * $Id: main.cpp 5 2010-07-12 20:51:11Z ajk $
AjK 0:0a841b89d614 20 *
AjK 0:0a841b89d614 21 ***************************************************************************/
AjK 0:0a841b89d614 22
AjK 0:0a841b89d614 23 #include "sowb.h"
AjK 0:0a841b89d614 24 #include "debug.h"
AjK 0:0a841b89d614 25 #include "rit.h"
AjK 0:0a841b89d614 26 #include "gps.h"
AjK 0:0a841b89d614 27 #include "gpio.h"
AjK 0:0a841b89d614 28
AjK 0:0a841b89d614 29 volatile uint32_t uptimeL;
AjK 0:0a841b89d614 30 volatile uint32_t uptimeH;
AjK 0:0a841b89d614 31
AjK 0:0a841b89d614 32 /* Declare "timer at zero" callback function prototypes. */
AjK 0:0a841b89d614 33 void _gps_timer_tick_cb(int);
AjK 0:0a841b89d614 34 void _user_wait_ms_cb(int);
AjK 0:0a841b89d614 35 void _nexstar_timeout_callback(int);
AjK 0:0a841b89d614 36 void _nexstar_one_second_timer(int index);
AjK 0:0a841b89d614 37 void _nexstar_100th_timer(int index);
AjK 0:0a841b89d614 38 void _flash_write_timer_callback(int index);
AjK 0:0a841b89d614 39 void _main_test_callback(int index);
AjK 0:0a841b89d614 40 void _sdcard_timer_callback(int index);
AjK 0:0a841b89d614 41
AjK 0:0a841b89d614 42 /* Define an array of timers that the ISR should handle. */
AjK 0:0a841b89d614 43 volatile RIT_TIMER timers[] = {
AjK 0:0a841b89d614 44 { 10, 10, _gps_timer_tick_cb }, /* Index 0 */
AjK 0:0a841b89d614 45 { 0, 0, _user_wait_ms_cb }, /* Index 1 */
AjK 0:0a841b89d614 46 { 0, 0, _nexstar_timeout_callback }, /* Index 2 */
AjK 0:0a841b89d614 47 { 0, 0, _nexstar_one_second_timer }, /* Index 3 */
AjK 0:0a841b89d614 48 { 0, 0, _nexstar_100th_timer }, /* Index 4 */
AjK 0:0a841b89d614 49 { 0, 0, _flash_write_timer_callback }, /* Index 5 */
AjK 0:0a841b89d614 50 { 0, 0, _sdcard_timer_callback }, /* Index 6 */
AjK 0:0a841b89d614 51 { 0, 0, _main_test_callback }, /* Index 7 */
AjK 0:0a841b89d614 52 { 0, 0, NULL } /* Always the last entry. */
AjK 0:0a841b89d614 53 };
AjK 0:0a841b89d614 54
AjK 0:0a841b89d614 55 /** RIT_IRQHandler
AjK 0:0a841b89d614 56 *
AjK 0:0a841b89d614 57 * The ISR for the RIT.
AjK 0:0a841b89d614 58 */
AjK 0:0a841b89d614 59 extern "C" static void RIT_IRQHandler(void) __irq {
AjK 0:0a841b89d614 60 if (++uptimeL == 0) uptimeH++;
AjK 0:0a841b89d614 61 for (int index = 0; timers[index].callback != NULL; index++) {
AjK 0:0a841b89d614 62 if (timers[index].counter > 0) {
AjK 0:0a841b89d614 63 timers[index].counter--;
AjK 0:0a841b89d614 64 if (timers[index].counter == 0) {
AjK 0:0a841b89d614 65 (timers[index].callback)(index);
AjK 0:0a841b89d614 66 if (timers[index].reload > 0) {
AjK 0:0a841b89d614 67 timers[index].counter = timers[index].reload;
AjK 0:0a841b89d614 68 }
AjK 0:0a841b89d614 69 }
AjK 0:0a841b89d614 70 }
AjK 0:0a841b89d614 71 }
AjK 0:0a841b89d614 72 LPC_RIT->RICTRL |= 0x1; /* Dismiss the IRQ. */
AjK 0:0a841b89d614 73 }
AjK 0:0a841b89d614 74
AjK 0:0a841b89d614 75 /** rit_index_check
AjK 0:0a841b89d614 76 *
AjK 0:0a841b89d614 77 * Check that an index exists. Ensures that index into array is valid.
AjK 0:0a841b89d614 78 *
AjK 0:0a841b89d614 79 * @param int inex The index to check.
AjK 0:0a841b89d614 80 * @return int zero on non-existent index, non-zero otherwise.
AjK 0:0a841b89d614 81 */
AjK 0:0a841b89d614 82 inline static bool rit_index_check(int index) {
AjK 0:0a841b89d614 83 for (int i = 0; timers[i].callback != NULL; i++) if (i == index) return true;
AjK 0:0a841b89d614 84 return false;
AjK 0:0a841b89d614 85 }
AjK 0:0a841b89d614 86
AjK 0:0a841b89d614 87 /** rit_timer_set_counter
AjK 0:0a841b89d614 88 */
AjK 0:0a841b89d614 89 void rit_timer_set_counter(int index, uint32_t value) {
AjK 0:0a841b89d614 90 if (rit_index_check(index)) timers[index].counter = value;
AjK 0:0a841b89d614 91 }
AjK 0:0a841b89d614 92
AjK 0:0a841b89d614 93 /** rit_timer_set_reload
AjK 0:0a841b89d614 94 */
AjK 0:0a841b89d614 95 void rit_timer_set_reload(int index, uint32_t value) {
AjK 0:0a841b89d614 96 if (rit_index_check(index)) timers[index].reload = value;
AjK 0:0a841b89d614 97 }
AjK 0:0a841b89d614 98
AjK 0:0a841b89d614 99 /** rit_timer_get_values
AjK 0:0a841b89d614 100 *
AjK 0:0a841b89d614 101 * Get the current counter/reload values of the specified timer.
AjK 0:0a841b89d614 102 *
AjK 0:0a841b89d614 103 * If the supplied "index" value is out of range the index value pointed to by
AjK 0:0a841b89d614 104 * the caller is set to -1 to signify an error has occured (subscript/index out
AjK 0:0a841b89d614 105 * of range).
AjK 0:0a841b89d614 106 *
AjK 0:0a841b89d614 107 * @param int * index A pointer to an int for the index value of the array to return.
AjK 0:0a841b89d614 108 * @param uint32_t * counter A pointer to variable to place the counter value into.
AjK 0:0a841b89d614 109 * @param uint32_t * counter A pointer to variable to place the reload value into.
AjK 0:0a841b89d614 110 */
AjK 0:0a841b89d614 111 void rit_timer_get_values(int *index, uint32_t *counter, uint32_t *reload) {
AjK 0:0a841b89d614 112 if (rit_index_check(*(index))) {
AjK 0:0a841b89d614 113 *(counter) = timers[*(index)].counter;
AjK 0:0a841b89d614 114 *(reload) = timers[*(index)].reload;
AjK 0:0a841b89d614 115 }
AjK 0:0a841b89d614 116 else *(index) = -1;
AjK 0:0a841b89d614 117 }
AjK 0:0a841b89d614 118
AjK 0:0a841b89d614 119 /** rit_get_uptime
AjK 0:0a841b89d614 120 */
AjK 0:0a841b89d614 121 void rit_read_uptime(uint32_t *h, uint32_t *l) {
AjK 0:0a841b89d614 122 *(l) = uptimeL;
AjK 0:0a841b89d614 123 *(h) = uptimeH;
AjK 0:0a841b89d614 124 }
AjK 0:0a841b89d614 125
AjK 0:0a841b89d614 126 /** rit_init
AjK 0:0a841b89d614 127 */
AjK 0:0a841b89d614 128 void rit_init(void) {
AjK 0:0a841b89d614 129
AjK 0:0a841b89d614 130 DEBUG_INIT_START;
AjK 0:0a841b89d614 131
AjK 0:0a841b89d614 132 uptimeL = uptimeH = 0;
AjK 0:0a841b89d614 133
AjK 0:0a841b89d614 134 /* Start by switching power on to the peripheral */
AjK 0:0a841b89d614 135 LPC_SC->PCONP |= (1UL << 16);
AjK 0:0a841b89d614 136
AjK 0:0a841b89d614 137 /* The compare value depends on the PCLK frequency.
AjK 0:0a841b89d614 138 The following are based on a CCLK of 96Mhz to
AjK 0:0a841b89d614 139 achieve a 1ms timeout value. */
AjK 0:0a841b89d614 140 switch ((LPC_SC->PCLKSEL1 >> 26) & 0x3) {
AjK 0:0a841b89d614 141 case 0: LPC_RIT->RICOMPVAL = (96000000L / 4 / 1000); break; /* CCLK / 4 */
AjK 0:0a841b89d614 142 case 1: LPC_RIT->RICOMPVAL = (96000000L / 1 / 1000); break; /* CCLK / 1 */
AjK 0:0a841b89d614 143 case 2: LPC_RIT->RICOMPVAL = (96000000L / 2 / 1000); break; /* CCLK / 2 */
AjK 0:0a841b89d614 144 case 3: LPC_RIT->RICOMPVAL = (96000000L / 8 / 1000); break; /* CCLK / 8 */
AjK 0:0a841b89d614 145 }
AjK 0:0a841b89d614 146
AjK 0:0a841b89d614 147 /* Set the ISR vector and enable interrupts for the RIT. */
AjK 0:0a841b89d614 148 NVIC_SetVector(RIT_IRQn, (uint32_t)RIT_IRQHandler);
AjK 0:0a841b89d614 149 NVIC_EnableIRQ(RIT_IRQn);
AjK 0:0a841b89d614 150
AjK 0:0a841b89d614 151 /* Enable the RIT. */
AjK 0:0a841b89d614 152 LPC_RIT->RICTRL = 0x0000000A;
AjK 0:0a841b89d614 153
AjK 0:0a841b89d614 154 DEBUG_INIT_END;
AjK 0:0a841b89d614 155 }