Tom Soulanille / scope-RAM

A library for observing RAM utilization with an oscilloscope.

scope_RAM.cpp@1:b6905730f836, 2013-11-12 (annotated)

Committer:
altasoul
Date:
Tue Nov 12 07:35:11 2013 +0000
Revision:
1:b6905730f836
Parent:
0:e996e4a4c783 
for publication (no docs yet)

Who changed what in which revision?

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altasoul 1:b6905730f836 1 /*
altasoul 1:b6905730f836 2 * Copyright (c) 2013 Tom Soulanille
altasoul 1:b6905730f836 3 *
altasoul 1:b6905730f836 4 *
altasoul 1:b6905730f836 5 * Licensed under the Apache License, Version 2.0 (the "License");
altasoul 1:b6905730f836 6 * you may not use this file except in compliance with the License.
altasoul 1:b6905730f836 7 * You may obtain a copy of the License at
altasoul 1:b6905730f836 8 *
altasoul 1:b6905730f836 9 * http://www.apache.org/licenses/LICENSE-2.0
altasoul 1:b6905730f836 10 *
altasoul 1:b6905730f836 11 * Unless required by applicable law or agreed to in writing, software
altasoul 1:b6905730f836 12 * distributed under the License is distributed on an "AS IS" BASIS,
altasoul 1:b6905730f836 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
altasoul 1:b6905730f836 14 * See the License for the specific language governing permissions and
altasoul 1:b6905730f836 15 * limitations under the License.
altasoul 1:b6905730f836 16 */
altasoul 1:b6905730f836 17
altasoul 0:e996e4a4c783 18 #include "mbed.h"
altasoul 0:e996e4a4c783 19 #include "scope_RAM.h"
altasoul 0:e996e4a4c783 20
altasoul 0:e996e4a4c783 21 RAMscope::RAMscope(
altasoul 0:e996e4a4c783 22 PinName trigger_pin,
altasoul 0:e996e4a4c783 23 PinName value_pin
altasoul 0:e996e4a4c783 24 ) :
altasoul 0:e996e4a4c783 25 trigger_output(trigger_pin),
altasoul 0:e996e4a4c783 26 value_output(value_pin),
altasoul 0:e996e4a4c783 27 scope_ram_timer(&RAMscope::scope_ram, osTimerPeriodic, (void *)this)
altasoul 0:e996e4a4c783 28 {
altasoul 0:e996e4a4c783 29
altasoul 0:e996e4a4c783 30 }
altasoul 0:e996e4a4c783 31
altasoul 0:e996e4a4c783 32 void RAMscope::scope_ram(const void *arg) {
altasoul 0:e996e4a4c783 33 RAMscope *instance = (RAMscope*)arg;
altasoul 0:e996e4a4c783 34 instance->output_to_scope();
altasoul 0:e996e4a4c783 35 }
altasoul 0:e996e4a4c783 36
altasoul 0:e996e4a4c783 37 void RAMscope::output_to_scope(void) {
altasoul 0:e996e4a4c783 38 int i;
altasoul 0:e996e4a4c783 39 unsigned char *p = start;
altasoul 0:e996e4a4c783 40 trigger_output = true; trigger_output = false;
altasoul 0:e996e4a4c783 41 for (i=0; i<length; i++) {
altasoul 0:e996e4a4c783 42 value_output = *p++ == WATERMARK;
altasoul 0:e996e4a4c783 43 }
altasoul 0:e996e4a4c783 44 value_output = false;
altasoul 0:e996e4a4c783 45 }
altasoul 0:e996e4a4c783 46
altasoul 0:e996e4a4c783 47 void RAMscope::watermark(unsigned char *st, int len) {
altasoul 0:e996e4a4c783 48 while (len--) *st++ = WATERMARK;
altasoul 0:e996e4a4c783 49 }
altasoul 0:e996e4a4c783 50
altasoul 0:e996e4a4c783 51 void RAMscope::scope(unsigned char *st, int len, int period) {
altasoul 0:e996e4a4c783 52 start = st;
altasoul 0:e996e4a4c783 53 length = len;
altasoul 0:e996e4a4c783 54 scope_ram_timer.start(period);
altasoul 0:e996e4a4c783 55 }
altasoul 0:e996e4a4c783 56
altasoul 0:e996e4a4c783 57 void RAMscope::stop() {
altasoul 0:e996e4a4c783 58 scope_ram_timer.stop();
altasoul 0:e996e4a4c783 59 }