/*
* ds18b20.c
*
* Created on: Feb 20, 2024
* Author: Jewel James
*/
#include "main.h"
#include "ds18b20.h"
// Internal utility functions
void DelayUS(uint32_t US) {
__HAL_TIM_SET_COUNTER(&htim14, 0);
HAL_TIM_Base_Start(&htim14);
while (__HAL_TIM_GET_COUNTER(&htim14) < US);
HAL_TIM_Base_Stop(&htim14);
}
void SetDQMode(uint8_t OutOrIn) {
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = TEMP_1W_Pin;
GPIO_InitStruct.Pull = GPIO_NOPULL;
if(OutOrIn == 0) {
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
}
else {
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
}
HAL_GPIO_Init(TEMP_1W_GPIO_Port, &GPIO_InitStruct);
}
// Send the reset slot and return the presence pulse
uint8_t DS18B20_Reset() {
uint8_t Response = 0;
SetDQMode(1);
WRITE_DQ(0);
DelayUS(480);
SetDQMode(0);
DelayUS(70);
Response = READ_DQ();
return Response;
}
void DS18B20_WriteBit(uint8_t Bit) {
if (Bit) { // Send '1'
WRITE_DQ(0);
SetDQMode(1); // Set the bus low
DelayUS(6);
SetDQMode(0); // Release bus - bit high by pullup
DelayUS(64);
}
else { // Send '0'
WRITE_DQ(0);
SetDQMode(1); // Set the bus low
DelayUS(60);
SetDQMode(0); // Release bus - bit high by pullup
DelayUS(10);
}
}
uint8_t DS18B20_ReadBit() {
uint8_t Bit = 0;
WRITE_DQ(1);
SetDQMode(1);
DelayUS(2);
SetDQMode(0);
DelayUS(10);
Bit = READ_DQ();
DelayUS(55);
return Bit;
}
uint8_t DS18B20_ReadByte() {
uint8_t i = 8, Byte = 0;
do {
Byte >>= 1;
Byte |= (DS18B20_ReadBit() << 7); // LSB first
} while(--i);
return Byte;
}
void DS18B20_WriteByte(uint8_t Byte) {
uint8_t i = 8;
do {
DS18B20_WriteBit(Byte & 1); // LSB first
Byte >>= 1;
} while(--i);
}
/*
* ds18b20.h
*
* Created on: Feb 22, 2024
* Author: Jewel James
*/
#include "main.h"
#ifndef INC_DS18B20_H_
#define INC_DS18B20_H_
#define DQ_PORT TEMP_1W_GPIO_Port
#define DQ_PIN TEMP_1W_Pin
#define WRITE_DQ(STATE) HAL_GPIO_WritePin(TEMP_1W_GPIO_Port, TEMP_1W_Pin, STATE)
#define READ_DQ() HAL_GPIO_ReadPin(TEMP_1W_GPIO_Port, TEMP_1W_Pin)
// Commands
#define CMD_RSCRATCHPAD 0xBE
#define CMD_WSCRATCHPAD 0x4E
#define CMD_CPYSCRATCHPAD 0x48
#define CMD_RECEEPROM 0xB8
#define CMD_RPWRSUPPLY 0xB4
#define CMD_SEARCHROM 0xF0
#define CMD_READROM 0x33
#define CMD_MATCHROM 0x55
#define CMD_SKIPROM 0xCC
#define CMD_CONVERT 0x44
void SetDQMode(uint8_t OutOrIn);
void DelayUS(uint32_t US);
void DS18B20_Test();
uint8_t DS18B20_Reset();
uint8_t DS18B20_ReadBit();
uint8_t DS18B20_ReadByte();
void DS18B20_WriteBit(uint8_t Bit);
void DS18B20_WriteByte(uint8_t Byte);
#endif /* INC_DS18B20_H_ */
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "ds18b20.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
#define LED_SET(STATE) HAL_GPIO_WritePin(LED_OUT_GPIO_Port, LED_OUT_Pin, STATE)
#define BUZZER_SET(STATE) HAL_GPIO_WritePin(BUZZER_OUT_GPIO_Port, BUZZER_OUT_Pin, STATE)
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim14;
/* USER CODE BEGIN PV */
uint8_t test = 0;
uint8_t UByte, LByte;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM14_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_TIM14_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
// LED_SET(1);
//
// SetDQMode(1);
// WRITE_DQ(1);
// WRITE_DQ(0);
// WRITE_DQ(1);
//
// SetDQMode(0);
// test = READ_DQ();
// test = READ_DQ();
// test = READ_DQ();
// test = READ_DQ();
test = DS18B20_Reset();
if (!test) {
DS18B20_WriteByte(CMD_SKIPROM);
DS18B20_WriteByte(CMD_CONVERT);
HAL_Delay(800);
}
test = DS18B20_Reset();
if (!test) {
DS18B20_WriteByte(CMD_SKIPROM);
DS18B20_WriteByte(CMD_RSCRATCHPAD);
UByte = DS18B20_ReadByte();
LByte = DS18B20_ReadByte();
}
// LED_SET(1);
// for(int i = 0; i < 100; i++)
// DelayUS(10000);
// LED_SET(0);
// for(int i = 0; i < 100; i++)
// DelayUS(10000);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL8;
RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief TIM14 Initialization Function
* @param None
* @retval None
*/
static void MX_TIM14_Init(void)
{
/* USER CODE BEGIN TIM14_Init 0 */
/* USER CODE END TIM14_Init 0 */
/* USER CODE BEGIN TIM14_Init 1 */
/* USER CODE END TIM14_Init 1 */
htim14.Instance = TIM14;
htim14.Init.Prescaler = 31;
htim14.Init.CounterMode = TIM_COUNTERMODE_UP;
htim14.Init.Period = 65535;
htim14.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim14.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
if (HAL_TIM_Base_Init(&htim14) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM14_Init 2 */
/* USER CODE END TIM14_Init 2 */
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOA, LED_OUT_Pin|BUZZER_OUT_Pin|TEMP_1W_Pin, GPIO_PIN_RESET);
/*Configure GPIO pins : LED_OUT_Pin BUZZER_OUT_Pin */
GPIO_InitStruct.Pin = LED_OUT_Pin|BUZZER_OUT_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/*Configure GPIO pin : TEMP_1W_Pin */
GPIO_InitStruct.Pin = TEMP_1W_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(TEMP_1W_GPIO_Port, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
