test rtc
PCF85263AT.cpp
- Committer:
- irsanjul
- Date:
- 2020-06-17
- Revision:
- 0:fa906a89a756
File content as of revision 0:fa906a89a756:
#include "mbed.h" #include "PCF85263AT.h" extern Serial dbg; PCF85263AT::PCF85263AT(PinName sda, PinName scl) : i2c (sda, scl) { i2c.frequency(100000); } PCF85263AT::~PCF85263AT() { } bool PCF85263AT::write(char adr, char data) { w[0] = adr; w[1] = data; if (i2c.write(address, w, 2) != 0) return 0; return true; } char PCF85263AT::read(char adr) { char start = adr; if (i2c.write(address, &start, 1, true) != 0) return 0; if (i2c.read(address, r, 1) != 0) return 0; return r[0]; } time_t PCF85263AT::now() { struct tm now; char buffer[6]; buffer [0] = read(SEC); buffer [1] = read(MIN); buffer [2] = read(HOUR); buffer [3] = read(DAY); buffer [4] = read(MONTH); buffer [5] = read(YEAR); now.tm_sec = bcdToDecimal(buffer[0] & 0x7F); now.tm_min = bcdToDecimal(buffer[1] & 0x7F); now.tm_hour = bcdToDecimal(buffer[2] & 0x3F); now.tm_mday = bcdToDecimal(buffer[3] & 0x3F); now.tm_mon = bcdToDecimal(buffer[4] & 0x1F) - 1; now.tm_year = bcdToDecimal(buffer[5] & 0xFF) + 2000 - 1900; return mktime(&now); } bool PCF85263AT::set_time(time_t time) { struct tm *now; char buffer[9]; now = localtime(&time); // send stop signal buffer[0] = 0x01; if(!write(STOPEN, buffer[0]))return 0; // clear prescaler buffer[0] = 0xA4; if(!write(RESET, buffer[0]))return 0; // set time buffer[0] = decimalToBcd(now->tm_sec) & 0x7F; // VL = 0 buffer[1] = decimalToBcd(now->tm_min) & 0x7F; buffer[2] = decimalToBcd(now->tm_hour) & 0x3F; buffer[3] = decimalToBcd(now->tm_mday) & 0x3F; buffer[4] = now->tm_wday + 1; buffer[5] = decimalToBcd(now->tm_mon+1) & 0x1F; buffer[6] = decimalToBcd(now->tm_year + 1900 - 2000); if(!write(SEC, buffer[0]))return 0; if(!write(MIN, buffer[1]))return 0; if(!write(HOUR, buffer[2]))return 0; if(!write(DAY, buffer[3]))return 0; if(!write(WDAY, buffer[4]))return 0; if(!write(MONTH, buffer[5]))return 0; if(!write(YEAR, buffer[6]))return 0; // clear stop signal buffer[0] = 0x00; if(!write(STOPEN, buffer[0]))return 0; return true; } bool PCF85263AT::IsConnected() { bool ok = false; i2c.start(); i2c.stop(); if (i2c.read(address, &data[0], 1) != 0) { // dbg.printf("PCF85263AT is not detected\r\n"); ok = false; } else { // dbg.printf("PCF85263AT is detected\r\n"); ok = true; } data[0] = 0; i2c.start(); i2c.stop(); return ok; } bool PCF85263AT::software_reset() { char buffer = 0x2C; if(!write(RESET, buffer)) return 0; return 1; }