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/*
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* clock.cpp
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*
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* Created on: Nov 5, 2014
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* Author: Alan Aguilar Sologuren
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*/
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#include <clock.h>
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#include <Wire/Wire.h>
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namespace te_clock {
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/*!
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* \fn request
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* \brief Escribe un valor en la memoria RAM interna del RTC DS1308, en la
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* direccion especificada.
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* \param addr direccion relativa a la RAM (0 es la primera) del registro
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* en DS1308.
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* \param reqcode El codigo del comando a ejecutar
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*/
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inline uint8_t request(uint8_t reqcode, uint8_t addr=-1, uint8_t val=-1) {
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Wire.beginTransmission(IDT5V19_CTRL_ID);
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Wire.write(reqcode);
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if(addr!=-1)Wire.write(addr);
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if(val!=-1)Wire.write(val);
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return Wire.endTransmission();
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}
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/*!
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* \fn progsave
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* \brief Escribe un valor en la memoria RAM interna del RTC DS1308, en la
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* direccion especificada.
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*/
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inline uint8_t progsave(void) {
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return request(0x01);
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}
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/*!
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* \fn progrestore
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* \brief Escribe un valor en la memoria RAM interna del RTC DS1308, en la
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* direccion especificada.
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*/
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inline uint8_t progrestore(void) {
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return request(0x02);
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}
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/*!
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* \fn read
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* \brief Lee un buffer de la memoria RAM interna del RTC DS1308, de la
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* direccion especificada.
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* \param addr direccion relativa a la RAM (0 es la primera) del registro
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* en DS1308.
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* \param buff Direccion del buffer al cual se copiaran los valores.
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* \param cnt Numero de elementos acpiar del DS1308.
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* \return estatus
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* 0 success
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* 2 error: address send, nack received
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* 3 error: data send, nack received
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* 4 other twi error
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*/
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uint8_t progread(uint8_t addr, uint8_t buf[], uint8_t cnt ) {
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uint8_t nread=0;
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while( (cnt > 0) && ( addr < IDT5V19_MAX_ADD ) ) {
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request(0x00, addr);
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Wire.requestFrom((uint8_t)IDT5V19_CTRL_ID, cnt);
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while(Wire.available() && (cnt > 0) && (addr < IDT5V19_MAX_ADD) ) {
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buf[nread] = Wire.read();
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nread++; cnt--; addr++;
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} /* while */
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}
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return (nread);
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}
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/*!
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* \fn progwrite
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* \brief Escribe el contenido de un buffer de cnt elementos en la memoria
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* RAM interna del RTC DS1308, en la direccion especificada.
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* \param addr direccion relativa a la RAM (0 es la primera) del inicio del
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* buffer en DS1308.
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* \param pbuf direccion del buffer a copiar en la RAM del DS1308.
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* \param cnt Numero de elementos a copiar.
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* \return estatus
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* 0 success
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* 2 error: address send, nack received
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* 3 error: data send, nack received
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* 4 other twi error
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*/
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uint8_t progwrite(uint8_t addr, const uint8_t *pbuf,uint8_t cnt) {
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uint8_t nbytes, rc=0;
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if (addr >= IDT5V19_MAX_ADD) return (IDT5V19_MAX_ADD); // 0 thru 55
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if (addr+cnt > IDT5V19_MAX_ADD) cnt = IDT5V19_MAX_ADD-addr;
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while (cnt > 0) {
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nbytes = min(cnt, BUFFER_LENGTH-1);
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Wire.beginTransmission(IDT5V19_CTRL_ID);
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Wire.write(0x00);
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Wire.write(addr);
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Wire.write((uint8_t*)pbuf, nbytes);
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rc = Wire.endTransmission();
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cnt -=nbytes;
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addr+=nbytes;
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pbuf +=nbytes;
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}
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return(rc);
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}
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}
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