262 lines
6.9 KiB
C
262 lines
6.9 KiB
C
#include "DS18B20.h"
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#define DS18B20_PORT GPIOC
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#define DS18B20_PIN GPIO_PIN_1
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void DS18B20_OUTPUT(void) {
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = DS18B20_PIN;
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GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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HAL_GPIO_Init(DS18B20_PORT, &GPIO_InitStruct);
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}
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void DS18B20_INPUT(void) {
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = DS18B20_PIN;
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GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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// GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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HAL_GPIO_Init(DS18B20_PORT, &GPIO_InitStruct);
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}
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void DS18B20_Reset(void) {
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DS18B20_OUTPUT();
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
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Delay_us(750);
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
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Delay_us(15);
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}
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uint8_t DS18B20_Check(void)
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{
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uint8_t retry=0;
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DS18B20_INPUT();
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while ((HAL_GPIO_ReadPin(DS18B20_PORT, DS18B20_PIN))&&retry<200)
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{
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retry++;
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Delay_us(1);
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};
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if(retry>=200) return 0;
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else retry=0;
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while (!(HAL_GPIO_ReadPin(DS18B20_PORT, DS18B20_PIN))&&retry<240)
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{
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retry++;
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Delay_us(1);
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};
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Delay_us(480);
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if(retry>=300) return 0;
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return 1;
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}
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uint8_t DS18B20_Read_Bit(void) // read one bit
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{
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uint8_t data;
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DS18B20_OUTPUT();
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
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Delay_us(2);
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
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DS18B20_INPUT();
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Delay_us(12);
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if((HAL_GPIO_ReadPin(DS18B20_PORT, DS18B20_PIN))) data=1;
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else data=0;
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Delay_us(50);
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return data;
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}
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uint8_t DS18B20_ReadByte(void) {
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uint8_t byte = 0;
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uint8_t j=0;
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for (uint8_t i = 0; i < 8; i++) {
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j=DS18B20_Read_Bit();
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byte=(j<<7)|(byte>>1);
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}
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return byte;
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}
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void DS18B20_Write_Bit(uint8_t bit) {
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DS18B20_OUTPUT();
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if (bit == 1) {
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
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Delay_us(2);
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
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Delay_us(60);
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}
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else {
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
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Delay_us(60);
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
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Delay_us(2);
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}
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}
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void DS18B20_WriteByte(uint8_t data) {
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DS18B20_OUTPUT();
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for (uint8_t i = 0; i < 8; i++)
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{
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if (data & 0x01)
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{
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
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Delay_us(2);
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
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Delay_us(60);
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}
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else
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{
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_RESET);
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Delay_us(60);
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
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Delay_us(2);
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}
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data >>= 1;
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}
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}
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void DS18B20_Start(void)// ds1820 start convert
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{
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DS18B20_Reset();
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DS18B20_Check();
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DS18B20_WriteByte(0xcc);// skip rom
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DS18B20_WriteByte(0x44);// convert
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}
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uint8_t DS18B20_Init()
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{
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Delay_Init() ;
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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__HAL_RCC_GPIOC_CLK_ENABLE();
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GPIO_InitStruct.Pin = DS18B20_PIN;
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GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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HAL_GPIO_Init(DS18B20_PORT, &GPIO_InitStruct);
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
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HAL_Delay(1000);
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DS18B20_Reset();
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return DS18B20_Check();
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}
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void DS18B20_Stop() {
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DS18B20_OUTPUT();
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HAL_GPIO_WritePin(DS18B20_PORT, DS18B20_PIN, GPIO_PIN_SET);
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}
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float DS18B20_GetTemperature() {
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uint8_t Hight_Byte = 0;
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uint8_t Low_Byte = 0;
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uint16_t value = 0;
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float temperture = 0;
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DS18B20_Start();
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DS18B20_Reset();
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uint8_t check = DS18B20_Check();
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// printf("check %d",check);
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DS18B20_WriteByte(0xCC);
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DS18B20_WriteByte(0xBE);
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Low_Byte = DS18B20_ReadByte();
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Hight_Byte = DS18B20_ReadByte();
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DS18B20_Stop();
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value = Hight_Byte;
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value = (value << 8) + Low_Byte;
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if ((value & 0xf800) == 0xf800) {
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value = (~value)+1;
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temperture = value*(-0.0625);
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}
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else {
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temperture = value*(0.0625);
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}
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// printf("Temperature 111: %.2f\n", temperture);
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return temperture;
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}
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//
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// void DS18B20_SearchROM(uint8_t *roms, uint8_t *count) {
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// uint8_t bit_value, complement_bit;
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// uint8_t rom[8];
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// uint8_t last_discrepancy = 0;
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// uint8_t rom_index = 0;
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// uint8_t search_complete = 0;
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//
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// *count = 0; // 设备数量清零
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// printf("Starting DS18B20 SearchROM...\n");
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//
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// while (!search_complete) {
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// DS18B20_Reset();
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// // uint8_t aaa=DS18B20_Check();
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// if (!DS18B20_Check()) { // 复位总线，检测是否有设备存在
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// return; // 没有设备，直接返回
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// }
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//
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// DS18B20_WriteByte(0xF0); // 发送 "搜索 ROM" 命令
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//
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// uint8_t bit_position = 1;
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// uint8_t discrepancy_marker = 0; // 记录新的冲突位置
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//
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// for (uint8_t i = 0; i < 64; i++) {
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// bit_value = DS18B20_Read_Bit();
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// complement_bit = DS18B20_Read_Bit();
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//
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// if (bit_value == 1 && complement_bit == 1) {
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// printf("No more devices found, stopping search.\n");
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// return;
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// }
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//
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// uint8_t chosen_bit;
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// if (bit_value == 0 && complement_bit == 0) {
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// // **发生冲突，选择路径**
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// if (bit_position < last_discrepancy) {
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// // 沿用之前的选择
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// chosen_bit = (rom[i / 8] >> (i % 8)) & 0x01;
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// } else if (bit_position == last_discrepancy) {
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// // 选择 1 继续遍历新路径
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// chosen_bit = 1;
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// } else {
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// // 选择 0 并记录新的冲突
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// chosen_bit = 0;
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// discrepancy_marker = bit_position;
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// }
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// } else {
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// // 读取到 0 或 1，直接存储
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// chosen_bit = bit_value;
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// }
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//
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// if (chosen_bit) {
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// rom[i / 8] |= (1 << (i % 8));
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// } else {
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// rom[i / 8] &= ~(1 << (i % 8));
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// }
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//
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// DS18B20_Write_Bit(chosen_bit);
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// bit_position++;
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// }
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//
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// // 存储找到的ROM地址
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// for (uint8_t j = 0; j < 8; j++) {
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// roms[rom_index * 8 + j] = rom[j];
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// }
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// rom_index++;
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//
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// // **搜索结束条件**
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// if (discrepancy_marker == 0) {
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// search_complete = 1;
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// }
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//
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// last_discrepancy = discrepancy_marker;
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// }
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//
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// *count = rom_index; // 返回找到的设备数量
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// }
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//
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