mbed API implementation for AT30TSE75X , EEPROM + Temperature sensor.
AT30TSE75X.cpp@0:0e430cef393b, 2016-03-22 (annotated)
- Committer:
- akhilpanayam
- Date:
- Tue Mar 22 04:58:03 2016 +0000
- Revision:
- 0:0e430cef393b
Initial Commit with implementations.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
akhilpanayam | 0:0e430cef393b | 1 | #include "AT30TSE75X.h" |
akhilpanayam | 0:0e430cef393b | 2 | |
akhilpanayam | 0:0e430cef393b | 3 | AT30TSE75X::AT30TSE75X(PinName sda, PinName scl) : at30tse75x_i2c(sda, scl), resolution(AT30TSE_CONFIG_RES_9_bit) { |
akhilpanayam | 0:0e430cef393b | 4 | at30tse75x_i2c.frequency(10000); |
akhilpanayam | 0:0e430cef393b | 5 | } |
akhilpanayam | 0:0e430cef393b | 6 | AT30TSE75X::~AT30TSE75X() { } |
akhilpanayam | 0:0e430cef393b | 7 | |
akhilpanayam | 0:0e430cef393b | 8 | float AT30TSE75X::read_temp() { |
akhilpanayam | 0:0e430cef393b | 9 | uint8_t bufferwrite[1]; |
akhilpanayam | 0:0e430cef393b | 10 | uint8_t buffer[2]; |
akhilpanayam | 0:0e430cef393b | 11 | float temperature; |
akhilpanayam | 0:0e430cef393b | 12 | uint16_t data; |
akhilpanayam | 0:0e430cef393b | 13 | buffer[0] = 0; |
akhilpanayam | 0:0e430cef393b | 14 | buffer[1] = 0; |
akhilpanayam | 0:0e430cef393b | 15 | |
akhilpanayam | 0:0e430cef393b | 16 | at30tse75x_i2c.read((AT30TSE_TEMPERATURE_TWI_ADDR << 1 ),(char *)buffer,AT30TSE_TEMPERATURE_REG_SIZE,false); |
akhilpanayam | 0:0e430cef393b | 17 | |
akhilpanayam | 0:0e430cef393b | 18 | |
akhilpanayam | 0:0e430cef393b | 19 | data = (buffer[0] << 8) | buffer[1]; |
akhilpanayam | 0:0e430cef393b | 20 | int8_t sign = 1; |
akhilpanayam | 0:0e430cef393b | 21 | |
akhilpanayam | 0:0e430cef393b | 22 | /* Check if negative and clear sign bit. */ |
akhilpanayam | 0:0e430cef393b | 23 | if (data & (1 << 15)) { |
akhilpanayam | 0:0e430cef393b | 24 | sign *= -1; |
akhilpanayam | 0:0e430cef393b | 25 | data &= ~(1 << 15); |
akhilpanayam | 0:0e430cef393b | 26 | } |
akhilpanayam | 0:0e430cef393b | 27 | |
akhilpanayam | 0:0e430cef393b | 28 | /* Convert to temperature. */ |
akhilpanayam | 0:0e430cef393b | 29 | switch (this->resolution) { |
akhilpanayam | 0:0e430cef393b | 30 | case AT30TSE_CONFIG_RES_9_bit: |
akhilpanayam | 0:0e430cef393b | 31 | data = (data >> 7); |
akhilpanayam | 0:0e430cef393b | 32 | (temperature) = data * sign * 0.5; |
akhilpanayam | 0:0e430cef393b | 33 | break; |
akhilpanayam | 0:0e430cef393b | 34 | |
akhilpanayam | 0:0e430cef393b | 35 | case AT30TSE_CONFIG_RES_10_bit: |
akhilpanayam | 0:0e430cef393b | 36 | data = (data >> 6); |
akhilpanayam | 0:0e430cef393b | 37 | (temperature) = data * sign * 0.25; |
akhilpanayam | 0:0e430cef393b | 38 | break; |
akhilpanayam | 0:0e430cef393b | 39 | |
akhilpanayam | 0:0e430cef393b | 40 | case AT30TSE_CONFIG_RES_11_bit: |
akhilpanayam | 0:0e430cef393b | 41 | data = (data >> 5); |
akhilpanayam | 0:0e430cef393b | 42 | (temperature) = data * sign * 0.125; |
akhilpanayam | 0:0e430cef393b | 43 | break; |
akhilpanayam | 0:0e430cef393b | 44 | |
akhilpanayam | 0:0e430cef393b | 45 | case AT30TSE_CONFIG_RES_12_bit: |
akhilpanayam | 0:0e430cef393b | 46 | data = (data >> 4); |
akhilpanayam | 0:0e430cef393b | 47 | (temperature) = data * sign * 0.0625; |
akhilpanayam | 0:0e430cef393b | 48 | break; |
akhilpanayam | 0:0e430cef393b | 49 | |
akhilpanayam | 0:0e430cef393b | 50 | default: |
akhilpanayam | 0:0e430cef393b | 51 | break; |
akhilpanayam | 0:0e430cef393b | 52 | } |
akhilpanayam | 0:0e430cef393b | 53 | return temperature; |
akhilpanayam | 0:0e430cef393b | 54 | } |
akhilpanayam | 0:0e430cef393b | 55 | |
akhilpanayam | 0:0e430cef393b | 56 | uint8_t AT30TSE75X:: read_eeprom(uint8_t *data, uint8_t length, uint8_t word_addr, uint8_t page) { |
akhilpanayam | 0:0e430cef393b | 57 | uint8_t buff[20]; |
akhilpanayam | 0:0e430cef393b | 58 | buff[0] = (word_addr & 0x0F) | ((0x0F & page) << 4); |
akhilpanayam | 0:0e430cef393b | 59 | |
akhilpanayam | 0:0e430cef393b | 60 | at30tse75x_i2c.write((int)(AT30TSE_EEPROM_TWI_ADDR << 1),(char *)buff,1,false); |
akhilpanayam | 0:0e430cef393b | 61 | return at30tse75x_i2c.read((int)(AT30TSE_EEPROM_TWI_ADDR << 1),(char *)data,length,false); |
akhilpanayam | 0:0e430cef393b | 62 | } |
akhilpanayam | 0:0e430cef393b | 63 | |
akhilpanayam | 0:0e430cef393b | 64 | uint8_t AT30TSE75X:: write_eeprom(uint8_t *data, uint8_t length, uint8_t word_addr, uint8_t page) |
akhilpanayam | 0:0e430cef393b | 65 | { |
akhilpanayam | 0:0e430cef393b | 66 | uint8_t buff[length+1];; |
akhilpanayam | 0:0e430cef393b | 67 | buff[0] = (word_addr & 0x0F) | ((0x0F & page) << 4); |
akhilpanayam | 0:0e430cef393b | 68 | for(int i = 0; i < length; i++) |
akhilpanayam | 0:0e430cef393b | 69 | { |
akhilpanayam | 0:0e430cef393b | 70 | buff[i+1] = *data++; |
akhilpanayam | 0:0e430cef393b | 71 | } |
akhilpanayam | 0:0e430cef393b | 72 | return at30tse75x_i2c.write((int)(AT30TSE_EEPROM_TWI_ADDR << 1),(char *)buff,(length + 1),false); |
akhilpanayam | 0:0e430cef393b | 73 | } |