- /**************************************************************************//**
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V2.10
- * $Date: 15/03/25 3:21p $
- * [url=home.php?mod=space&uid=247401]@brief[/url] Sample Code for temperature sensor by GPIO 1wire.
- *
- * @note
- * Copyright (C) 2019 Nuvoton Technology Corp. All rights reserved.
- *
- ******************************************************************************/
- #include <stdio.h>
- #include <math.h>
- #include "nano100series.h"
- #define DQ PD0
- /*---------------------------------------------------------------------------------------------------------*/
- /* Define global variables and constants */
- /*---------------------------------------------------------------------------------------------------------*/
- volatile uint16_t g_u16Data;
- volatile uint8_t g_u8DataH, g_u8DataL;
- /* Initial DS18B20 */
- uint8_t init_DS18B20(void)
- {
- uint8_t flag = 0;
- /* TX rest pulse*/
- DQ = 0;
- CLK_SysTickDelay(480);
- /* Wait for DS18B20 response*/
- DQ = 1;
- CLK_SysTickDelay(100);
- /* Get response pulse*/
- if (DQ == 0)
- /* Detect DS18B20 success */
- flag = 1;
- else
- /* Detect DS18B20 fail */
- flag = 0;
- CLK_SysTickDelay(380);
- DQ = 1;
- return flag;
- }
- /* Write a byte to DS18B20 */
- void writeDS18B20_byte(uint8_t u8wrData)
- {
- uint8_t i;
- for (i = 0; i < 8; i++)
- {
- /* Start write status */
- DQ = 0;
- CLK_SysTickDelay(15);
- /* Write bit */
- DQ = u8wrData & 0x01;
- CLK_SysTickDelay(45);
- /* Release bus */
- DQ = 1;
- u8wrData >>= 1;
- }
- }
- /* Read a byte from DS18B20 */
- uint8_t readDS18B20_byte(void)
- {
- uint8_t i, u8rdData = 0;
- for (i = 0; i < 8; i++)
- {
- /* Start read status */
- DQ = 0;
- u8rdData >>= 1;
- DQ = 1;
- CLK_SysTickDelay(5);
- /* Read bit */
- if (DQ == 1)
- u8rdData |= 0x80;
- /* Wait bus in idle */
- CLK_SysTickDelay(60);
- }
- return (u8rdData);
- }
- /* Combine high byte data with low byte data as temperature data */
- double DataCoding(uint16_t u16Data)
- {
- double Temperature;
- uint8_t i;
- int8_t j;
- for (i = 0, j = -4; i < 12; i++, j++)
- {
- if (u16Data & 0x01)
- Temperature += pow(2, j);
- u16Data >>= 1;
- }
- return (Temperature);
- }
- void SYS_Init(void)
- {
- /* Unlock protected registers */
- SYS_UnlockReg();
- /* Enable external HIRC */
- CLK_EnableXtalRC(CLK_PWRCTL_HIRC_EN_Msk);
- /* Waiting for clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_HIRC_STB_Msk);
- /* Set HCLK source form HIRC and HCLK source divide 1 */
- CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_HCLK_CLK_DIVIDER(1));
- /* Select IP clock source */
- CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HIRC, CLK_UART_CLK_DIVIDER(1));
- CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0_S_HIRC, 0);
- /* Enable IP clock */
- CLK_EnableModuleClock(UART0_MODULE);
- CLK_EnableModuleClock(TMR0_MODULE);
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set PB multi-function pins for UART0 RXD and TXD */
- SYS->PB_L_MFP &= ~(SYS_PB_L_MFP_PB0_MFP_Msk | SYS_PB_L_MFP_PB1_MFP_Msk);
- SYS->PB_L_MFP |= (SYS_PB_L_MFP_PB0_MFP_UART0_RX | SYS_PB_L_MFP_PB1_MFP_UART0_TX);
- /* Lock protected registers */
- SYS_LockReg();
- }
- void UART0_Init()
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init UART */
- /*---------------------------------------------------------------------------------------------------------*/
- UART_Open(UART0, 115200);
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* MAIN function */
- /*---------------------------------------------------------------------------------------------------------*/
- int main(void)
- {
- /* Init System, IP clock and multi-function I/O
- In the end of SYS_Init() will issue SYS_LockReg()
- to lock protected register. If user want to write
- protected register, please issue SYS_UnlockReg()
- to unlock protected register if necessary */
- SYS_Init();
- /* Init UART for printf */
- UART0_Init();
- printf("+-------------------------------------+ \n");
- printf("| Temperature Sensor Sample Code | \n");
- printf("+-------------------------------------+ \n");
- /* Configure PD.0 as Open Drain mode for 1wire communication */
- GPIO_SetMode(PD, BIT0, GPIO_PMD_OPEN_DRAIN);
- PD0 = 1;
- /*-----------------------------------------------------------------------------------------------------*/
- /* DS18B20 Temperature Sensor test */
- /*-----------------------------------------------------------------------------------------------------*/
- while (1)
- {
- /* Step 1: Initial DS18B20 */
- if (init_DS18B20())
- {
- /* Step 2: ROM Command */
- writeDS18B20_byte(0xCC); /* Skip ROM command */
- /* Step 3: Function Command */
- writeDS18B20_byte(0x44); /* Convert temperature */
- /* Delay for converting temperature */
- TIMER_Delay(TIMER0, 1000000);
- /* Step 1: Initial DS18B20 */
- if (init_DS18B20())
- {
- /* Step 2: ROM Command */
- writeDS18B20_byte(0xCC); /* Skip ROM command */
- /* Step 3: Function Command */
- writeDS18B20_byte(0xBE); /* Read temperature data*/
- /* Get low byte data of temperature*/
- g_u8DataL = readDS18B20_byte();
- /* Get high byte data of temperature*/
- g_u8DataH = (readDS18B20_byte() & 0x0f);
- /* Combine high byte data with low byte data */
- g_u16Data = (g_u8DataH << 8) | g_u8DataL;
- printf("Temperature raw data = %f\n", DataCoding(g_u16Data));
- }
- }
- }
- }
- /*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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