C code and C++ library, driver software for Maxim Integrated DS1775, DS75 thermometer and thermostat temperature sensor. Code supports continuous or shut-down/standby, hysteresis, alarm limits, comparator or interrupt mode, fault filtering, and active low/high. Compact 5-pin SOT23 packaging
Dependents: DS1775_Digital_Thermostat_Temperature
Diff: ds1775_cpp.cpp
- Revision:
- 9:315236fb3c6a
- Parent:
- 8:b2d4c71268aa
- Child:
- 10:03645de9c017
--- a/ds1775_cpp.cpp Sun Apr 07 07:43:11 2019 +0000 +++ b/ds1775_cpp.cpp Sun Apr 07 08:59:48 2019 +0000 @@ -56,6 +56,32 @@ } /******************************************************************************/ +int DS1775::read_cfg_reg(uint8_t *value) +{ + int32_t ret; + char data[1] = {0}; + char reg = DS1775_REG_CONFIGURATION; + + /* write to the Register Select, true is for repeated start */ + ret = m_i2c.write(m_write_address, ®, 1, true); + if (ret == 0) { + ret = m_i2c.read(m_read_address, data, 1, false); + if (ret == 0) { + *value = data[0]; + printf("%s: cfg %x\r\n", __func__, *value); + return DS1775_NO_ERROR; + } else { + printf( + "%s: failed to read data: ret: %d\r\n", __func__, ret); + } + } else { + printf("%s: failed to write to Register Select: ret: %d\r\n", + __func__, ret); + } + return DS1775_ERROR; +} + +/******************************************************************************/ int DS1775::read_reg(uint16_t *value, char reg) { int32_t ret; @@ -63,7 +89,7 @@ ds1775_raw_data tmp; if (reg <= DS1775_REG_MAX) { - /* write to the Register Select */ + /* write to the Register Select, true is for repeated start */ ret = m_i2c.write(m_write_address, ®, 1, true); /* read the two bytes of data */ if (ret == 0) { @@ -71,6 +97,8 @@ if (ret == 0) { tmp.msb = data[0]; tmp.lsb = data[1]; + printf( + "%s: MSB LSB %x %x\r\n", __func__, tmp.msb, tmp.lsb); *value = tmp.uwrd; return DS1775_NO_ERROR; } else { @@ -125,11 +153,29 @@ cmd[2] = tmp.lsb; ret = m_i2c.write(m_write_address, cmd, 3, false); if (ret == 0) { - if (DS1775_REG_CONFIGURATION == reg) { - m_extended_format = 0; - if (tmp.uwrd & DS1775_CFG_EXTENDED_FORMAT) - m_extended_format = 1; - } + return DS1775_NO_ERROR; + } else { + printf("%s: I2C write error %d\r\n",__func__, ret); + return DS1775_ERROR; + } + } else { + printf("%s: register value invalid %x\r\n",__func__, reg); + return DS1775_ERROR; + } +} + +/******************************************************************************/ +int DS1775::write_reg_one_byte(uint8_t value, char reg) +{ + int32_t ret; + char cmd[2]; + ds1775_raw_data tmp; + + if (reg == DS1775_REG_CONFIGURATION) { + cmd[0] = reg; + cmd[1] = value; + ret = m_i2c.write(m_write_address, cmd, 2, false); + if (ret == 0) { return DS1775_NO_ERROR; } else { printf("%s: I2C write error %d\r\n",__func__, ret); @@ -144,7 +190,7 @@ /******************************************************************************/ int DS1775::write_cfg(uint16_t cfg) { - return write_reg(cfg, DS1775_REG_CONFIGURATION); + return write_reg_one_byte(cfg, DS1775_REG_CONFIGURATION); } /******************************************************************************/