229 lines
5.9 KiB
C
229 lines
5.9 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2014 Uladzimir Pylinsky aka barthess
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <string.h>
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#include "hal.h"
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#include "boarddef.h"
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/*
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******************************************************************************
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* ERROR CHECKS
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******************************************************************************
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*/
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#if defined(BOARD_ST_STM32F4_DISCOVERY) || \
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defined(BOARD_ST_STM32F0_DISCOVERY) || \
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defined(BOARD_ST_STM32F0308_DISCOVERY)
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#if ONEWIRE_USE_STRONG_PULLUP
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#error "This board has not enough voltage for this feature"
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#endif
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#endif
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/*
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******************************************************************************
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* DEFINES
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******************************************************************************
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*/
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/*
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******************************************************************************
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* EXTERNS
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******************************************************************************
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*/
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/*
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******************************************************************************
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* PROTOTYPES
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******************************************************************************
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*/
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/*
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* Forward declarations
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*/
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#if ONEWIRE_USE_STRONG_PULLUP
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static void strong_pullup_assert(void);
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static void strong_pullup_release(void);
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#endif
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/*
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******************************************************************************
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* GLOBAL VARIABLES
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******************************************************************************
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*/
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static uint8_t testbuf[12];
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/* stores 3 temperature values in millicelsius */
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static int32_t temperature[3];
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/*
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* Config for underlying PWM driver.
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* Note! It is NOT constant because 1-wire driver needs to change them
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* during functioning.
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*/
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static PWMConfig pwm_cfg = {
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0,
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0,
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NULL,
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{
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL}
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},
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0,
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#if STM32_PWM_USE_ADVANCED
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0,
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#endif
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0
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};
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/*
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*
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*/
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static const onewireConfig ow_cfg = {
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&PWMD3,
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&pwm_cfg,
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PWM_OUTPUT_ACTIVE_LOW,
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ONEWIRE_MASTER_CHANNEL,
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ONEWIRE_SAMPLE_CHANNEL,
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ONEWIRE_PORT,
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ONEWIRE_PIN,
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#if defined(STM32F1XX)
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ONEWIRE_PAD_MODE_IDLE,
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#endif
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ONEWIRE_PAD_MODE_ACTIVE,
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#if ONEWIRE_USE_STRONG_PULLUP
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strong_pullup_assert,
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strong_pullup_release
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#endif
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};
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/*
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******************************************************************************
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******************************************************************************
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* LOCAL FUNCTIONS
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******************************************************************************
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******************************************************************************
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*/
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#if ONEWIRE_USE_STRONG_PULLUP
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/**
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*
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*/
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static void strong_pullup_assert(void) {
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palSetPadMode(ONEWIRE_PORT, ONEWIRE_PIN, PAL_MODE_STM32_ALTERNATE_PUSHPULL);
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}
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/**
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*
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*/
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static void strong_pullup_release(void) {
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palSetPadMode(ONEWIRE_PORT, ONEWIRE_PIN, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
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}
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#endif /* ONEWIRE_USE_STRONG_PULLUP */
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/*
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******************************************************************************
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* EXPORTED FUNCTIONS
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******************************************************************************
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*/
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/*
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*
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*/
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void onewireTest(void) {
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int16_t tmp;
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uint8_t rombuf[24];
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size_t devices_on_bus = 0;
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size_t i = 0;
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bool presence;
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onewireObjectInit(&OWD1);
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onewireStart(&OWD1, &ow_cfg);
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#if ONEWIRE_SYNTH_SEARCH_TEST
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synthSearchRomTest(&OWD1);
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#endif
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for (i=0; i<3; i++)
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temperature[i] = -666;
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while (true) {
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if (true == onewireReset(&OWD1)){
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memset(rombuf, 0x55, sizeof(rombuf));
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search_led_on();
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devices_on_bus = onewireSearchRom(&OWD1, rombuf, 3);
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search_led_off();
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osalDbgCheck(devices_on_bus <= 3);
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osalDbgCheck(devices_on_bus > 0);
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if (1 == devices_on_bus){
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/* test read rom command */
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presence = onewireReset(&OWD1);
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osalDbgCheck(true == presence);
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testbuf[0] = ONEWIRE_CMD_READ_ROM;
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onewireWrite(&OWD1, testbuf, 1, 0);
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onewireRead(&OWD1, testbuf, 8);
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osalDbgCheck(testbuf[7] == onewireCRC(testbuf, 7));
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osalDbgCheck(0 == memcmp(rombuf, testbuf, 8));
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}
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/* start temperature measurement on all connected devices at once */
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presence = onewireReset(&OWD1);
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osalDbgCheck(true == presence);
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testbuf[0] = ONEWIRE_CMD_SKIP_ROM;
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testbuf[1] = ONEWIRE_CMD_CONVERT_TEMP;
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#if ONEWIRE_USE_STRONG_PULLUP
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onewireWrite(&OWD1, testbuf, 2, TIME_MS2I(750));
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#else
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onewireWrite(&OWD1, testbuf, 2, 0);
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/* poll bus waiting ready signal from all connected devices */
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testbuf[0] = 0;
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while (testbuf[0] == 0){
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osalThreadSleepMilliseconds(50);
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onewireRead(&OWD1, testbuf, 1);
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}
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#endif
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for (i=0; i<devices_on_bus; i++) {
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/* read temperature device by device from their scratchpads */
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presence = onewireReset(&OWD1);
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osalDbgCheck(true == presence);
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testbuf[0] = ONEWIRE_CMD_MATCH_ROM;
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memcpy(&testbuf[1], &rombuf[i*8], 8);
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testbuf[9] = ONEWIRE_CMD_READ_SCRATCHPAD;
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onewireWrite(&OWD1, testbuf, 10, 0);
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onewireRead(&OWD1, testbuf, 9);
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osalDbgCheck(testbuf[8] == onewireCRC(testbuf, 8));
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memcpy(&tmp, &testbuf, 2);
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temperature[i] = ((int32_t)tmp * 625) / 10;
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}
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}
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else {
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osalSysHalt("No devices found");
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}
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osalThreadSleep(1); /* enforce ChibiOS's stack overflow check */
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}
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onewireStop(&OWD1);
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}
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