127 lines
3.3 KiB
C
Executable File
127 lines
3.3 KiB
C
Executable File
/*
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* ds75.c
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*
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* Created on: Aug 1, 2012
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* Author: tkl
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*/
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#include <stddef.h>
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#include "ds75.h"
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//-----------------------------------------------------------------------------
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#define TEMPERATURE_REGISTER_ADDR 0x00
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#define CONFIGURATION_REGISTER_ADDR 0x01
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//-----------------------------------------------------------------------------
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int ds75_open(const struct ds75 *device) {
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if(NULL == device) {
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return -1;
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}
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*device->config_value = 0x00;
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return device->i2c->fp->open(device->i2c->arch_dep_device);
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}
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//-----------------------------------------------------------------------------
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int ds75_close(const struct ds75 *device) {
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if(NULL == device) {
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return -1;
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}
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return device->i2c->fp->close(device->i2c->arch_dep_device);
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}
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//-----------------------------------------------------------------------------
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int ds75_set_precision(const struct ds75 *device, enum ds75_precision precision)
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{
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if(NULL == device) {
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return -1;
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}
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char cfg = *device->config_value | (precision << 5);
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char buffer[] = {CONFIGURATION_REGISTER_ADDR, cfg};
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int ret = device->i2c->fp->write(device->i2c->arch_dep_device,
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device->i2c_slave_addr, buffer, sizeof(buffer));
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if (ret >= 0) {
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*device->config_value = cfg;
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}
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return ret;
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}
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//-----------------------------------------------------------------------------
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enum ds75_precision ds_75_get_precision(const struct ds75 *device) {
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if(NULL == device) {
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return DS_75_PRECISION_INVALID;
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}
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char cfg = *device->config_value;
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cfg >>= 5;
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cfg &= 3;
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return (enum ds75_precision) cfg;
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}
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//-----------------------------------------------------------------------------
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int ds_75_shut_down(const struct ds75 *device) {
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if(NULL == device) {
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return -1;
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}
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char cfg = *device->config_value | (1 << 0);
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char buffer[] = {CONFIGURATION_REGISTER_ADDR, cfg};
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int ret = device->i2c->fp->write(device->i2c->arch_dep_device,
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device->i2c_slave_addr, buffer, sizeof(buffer));
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if (ret >= 0) {
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*device->config_value = cfg;
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}
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return ret;
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}
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//-----------------------------------------------------------------------------
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int ds_75_wakeup(const struct ds75 *device) {
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if(NULL == device) {
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return -1;
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}
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char cfg = *device->config_value & ~(1 << 0);
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char buffer[] = {CONFIGURATION_REGISTER_ADDR, cfg};
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int ret = device->i2c->fp->write(device->i2c->arch_dep_device,
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device->i2c_slave_addr, buffer, sizeof(buffer));
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if (ret >= 0) {
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*device->config_value = cfg;
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}
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return ret;
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}
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//-----------------------------------------------------------------------------
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struct ds75_temperature ds_75_get_temperature(const struct ds75 *device) {
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struct ds75_temperature ret;
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ret.temperature = 0xFFFF;
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ret.raw[0] = 0xFF;
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ret.raw[1] = 0xFF;
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ret.valid = false;
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if(NULL == device) {
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return ret;
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}
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// set temperature register
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char addr = TEMPERATURE_REGISTER_ADDR;
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int res = device->i2c->fp->write(device->i2c->arch_dep_device, device->i2c_slave_addr, &addr, 1);
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if(res < 0) {
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return ret;
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}
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// read temperature register
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res = device->i2c->fp->read(device->i2c->arch_dep_device, device->i2c_slave_addr, ret.raw, 2);
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if(res < 0) {
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return ret;
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}
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ret.valid = true;
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ret.temperature = ret.raw[0];
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if(ret.temperature & 0x0080) {
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ret.temperature |= 0xFF00;
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}
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ret.temperature *= 10;
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unsigned short s_low = (unsigned char)ret.raw[1];
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s_low >>= 4;
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s_low *= 625;
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s_low += 500;
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s_low /= 1000;
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ret.temperature += s_low;
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return ret;
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}
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