CCS811 dumb library
Dependents: Mt05_MtSense02 embernet-sensor-test
CCS811.cpp@1:57eb62ded32d, 2018-04-27 (annotated)
- Committer:
- johnathanlyu
- Date:
- Fri Apr 27 09:51:20 2018 +0000
- Revision:
- 1:57eb62ded32d
- Parent:
- 0:b5dbfc21185d
update initial flow
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
johnathanlyu | 0:b5dbfc21185d | 1 | #include "CCS811.h" |
johnathanlyu | 0:b5dbfc21185d | 2 | |
johnathanlyu | 1:57eb62ded32d | 3 | CCS811::CCS811(I2C& i2c, Serial& pc) : m_i2c(i2c), m_pc(pc) { |
johnathanlyu | 0:b5dbfc21185d | 4 | |
johnathanlyu | 0:b5dbfc21185d | 5 | } |
johnathanlyu | 0:b5dbfc21185d | 6 | |
johnathanlyu | 0:b5dbfc21185d | 7 | /** |
johnathanlyu | 0:b5dbfc21185d | 8 | ** Initial CCS811 need write MODE register and should Write APP START register to begin measurement. |
johnathanlyu | 0:b5dbfc21185d | 9 | **/ |
johnathanlyu | 0:b5dbfc21185d | 10 | void CCS811::init() { |
johnathanlyu | 0:b5dbfc21185d | 11 | char send[2]; |
johnathanlyu | 0:b5dbfc21185d | 12 | |
johnathanlyu | 0:b5dbfc21185d | 13 | if (!checkHW()) { |
johnathanlyu | 0:b5dbfc21185d | 14 | return; |
johnathanlyu | 0:b5dbfc21185d | 15 | }else { |
johnathanlyu | 1:57eb62ded32d | 16 | m_pc.printf("CCS811 is confirm!\r\n"); |
johnathanlyu | 0:b5dbfc21185d | 17 | } |
johnathanlyu | 0:b5dbfc21185d | 18 | |
johnathanlyu | 1:57eb62ded32d | 19 | send[0] = CCS811_REG_APP_START; |
johnathanlyu | 1:57eb62ded32d | 20 | send[1] = 0x00; |
johnathanlyu | 1:57eb62ded32d | 21 | |
johnathanlyu | 1:57eb62ded32d | 22 | m_i2c.write(CCS811_I2C_ADDR, send, 2); |
johnathanlyu | 1:57eb62ded32d | 23 | |
johnathanlyu | 0:b5dbfc21185d | 24 | send[0] = CCS811_REG_MEAS_MODE; |
johnathanlyu | 0:b5dbfc21185d | 25 | send[1] = CCS811_MEASUREMENT_MODE1; |
johnathanlyu | 0:b5dbfc21185d | 26 | |
johnathanlyu | 0:b5dbfc21185d | 27 | m_i2c.write(CCS811_I2C_ADDR, send, 2); |
johnathanlyu | 0:b5dbfc21185d | 28 | |
johnathanlyu | 0:b5dbfc21185d | 29 | } |
johnathanlyu | 0:b5dbfc21185d | 30 | |
johnathanlyu | 0:b5dbfc21185d | 31 | int CCS811::setMeasureMode(char mode) { |
johnathanlyu | 0:b5dbfc21185d | 32 | |
johnathanlyu | 0:b5dbfc21185d | 33 | char send[2]; |
johnathanlyu | 0:b5dbfc21185d | 34 | |
johnathanlyu | 0:b5dbfc21185d | 35 | send[0] = CCS811_MEASUREMENT_MODE1; |
johnathanlyu | 0:b5dbfc21185d | 36 | send[1] = mode; |
johnathanlyu | 0:b5dbfc21185d | 37 | |
johnathanlyu | 0:b5dbfc21185d | 38 | m_i2c.write(CCS811_I2C_ADDR, send, 2); |
johnathanlyu | 0:b5dbfc21185d | 39 | |
johnathanlyu | 0:b5dbfc21185d | 40 | send[0] = CCS811_REG_APP_START; |
johnathanlyu | 0:b5dbfc21185d | 41 | send[1] = 0x00; |
johnathanlyu | 0:b5dbfc21185d | 42 | |
johnathanlyu | 0:b5dbfc21185d | 43 | m_i2c.write(CCS811_I2C_ADDR, send, 2); |
johnathanlyu | 0:b5dbfc21185d | 44 | |
johnathanlyu | 0:b5dbfc21185d | 45 | return 0; |
johnathanlyu | 0:b5dbfc21185d | 46 | } |
johnathanlyu | 0:b5dbfc21185d | 47 | |
johnathanlyu | 0:b5dbfc21185d | 48 | /** |
johnathanlyu | 0:b5dbfc21185d | 49 | ** Here is that you can read CCS811 with co2 ppm and tvoc bbm is unsigned value |
johnathanlyu | 0:b5dbfc21185d | 50 | **/ |
johnathanlyu | 0:b5dbfc21185d | 51 | int CCS811::readData(uint16_t *ECO2, uint16_t *TVOC) { |
johnathanlyu | 0:b5dbfc21185d | 52 | |
johnathanlyu | 0:b5dbfc21185d | 53 | char recv[8]; |
johnathanlyu | 0:b5dbfc21185d | 54 | |
johnathanlyu | 0:b5dbfc21185d | 55 | |
johnathanlyu | 0:b5dbfc21185d | 56 | |
johnathanlyu | 0:b5dbfc21185d | 57 | recv[0] = CCS811_REG_ALG_RESULT_DATA; |
johnathanlyu | 0:b5dbfc21185d | 58 | m_i2c.write(CCS811_I2C_ADDR, recv, 1); |
johnathanlyu | 0:b5dbfc21185d | 59 | m_i2c.read( CCS811_I2C_ADDR, recv, 8); |
johnathanlyu | 0:b5dbfc21185d | 60 | |
johnathanlyu | 1:57eb62ded32d | 61 | // m_pc.printf("%X %X\r\n", recv[0], recv[1]); |
johnathanlyu | 1:57eb62ded32d | 62 | // m_pc.printf("%X %X\r\n", recv[2], recv[3]); |
johnathanlyu | 1:57eb62ded32d | 63 | // m_pc.printf("%X %X\r\n", recv[4], recv[5]); |
johnathanlyu | 1:57eb62ded32d | 64 | // m_pc.printf("%X %X\r\n", recv[6], recv[7]); |
johnathanlyu | 0:b5dbfc21185d | 65 | |
johnathanlyu | 0:b5dbfc21185d | 66 | *ECO2 = (uint16_t) (recv[0] <<8) + recv[1]; |
johnathanlyu | 0:b5dbfc21185d | 67 | *TVOC = (uint16_t) (recv[2] <<8) + recv[3]; |
johnathanlyu | 0:b5dbfc21185d | 68 | |
johnathanlyu | 0:b5dbfc21185d | 69 | return 0; |
johnathanlyu | 0:b5dbfc21185d | 70 | |
johnathanlyu | 0:b5dbfc21185d | 71 | } |
johnathanlyu | 0:b5dbfc21185d | 72 | |
johnathanlyu | 0:b5dbfc21185d | 73 | /** |
johnathanlyu | 0:b5dbfc21185d | 74 | ** Here for check is CCS811 hardware from i2c bus |
johnathanlyu | 0:b5dbfc21185d | 75 | **/ |
johnathanlyu | 0:b5dbfc21185d | 76 | bool CCS811::checkHW() { |
johnathanlyu | 0:b5dbfc21185d | 77 | |
johnathanlyu | 0:b5dbfc21185d | 78 | char read[1]; |
johnathanlyu | 0:b5dbfc21185d | 79 | char hid[1]; |
johnathanlyu | 0:b5dbfc21185d | 80 | |
johnathanlyu | 0:b5dbfc21185d | 81 | read[0] = CCS811_REG_HW_ID; |
johnathanlyu | 0:b5dbfc21185d | 82 | |
johnathanlyu | 0:b5dbfc21185d | 83 | m_i2c.write(CCS811_I2C_ADDR, read, 1, false); |
johnathanlyu | 0:b5dbfc21185d | 84 | m_i2c.read(CCS811_I2C_ADDR, hid, 1, false); |
johnathanlyu | 0:b5dbfc21185d | 85 | |
johnathanlyu | 1:57eb62ded32d | 86 | // m_pc.printf("%X\r\n", hid[0]); |
johnathanlyu | 0:b5dbfc21185d | 87 | |
johnathanlyu | 0:b5dbfc21185d | 88 | if (hid[0] == 0x81) { |
johnathanlyu | 0:b5dbfc21185d | 89 | return true; |
johnathanlyu | 0:b5dbfc21185d | 90 | } else { |
johnathanlyu | 0:b5dbfc21185d | 91 | return false; |
johnathanlyu | 0:b5dbfc21185d | 92 | } |
johnathanlyu | 0:b5dbfc21185d | 93 | |
johnathanlyu | 0:b5dbfc21185d | 94 | } |
johnathanlyu | 0:b5dbfc21185d | 95 | |
johnathanlyu | 0:b5dbfc21185d | 96 | /** |
johnathanlyu | 0:b5dbfc21185d | 97 | ** Here is provide you soft reset CCS811 module |
johnathanlyu | 0:b5dbfc21185d | 98 | **/ |
johnathanlyu | 0:b5dbfc21185d | 99 | bool CCS811::softRest() { |
johnathanlyu | 0:b5dbfc21185d | 100 | |
johnathanlyu | 0:b5dbfc21185d | 101 | char rstCMD[5] = {CCS811_REG_SW_RESET, 0x11,0xE5,0x72,0x8A}; |
johnathanlyu | 0:b5dbfc21185d | 102 | |
johnathanlyu | 0:b5dbfc21185d | 103 | m_i2c.write(CCS811_I2C_ADDR, rstCMD, 5); |
johnathanlyu | 0:b5dbfc21185d | 104 | |
johnathanlyu | 0:b5dbfc21185d | 105 | return false; |
johnathanlyu | 0:b5dbfc21185d | 106 | |
johnathanlyu | 0:b5dbfc21185d | 107 | } |
johnathanlyu | 0:b5dbfc21185d | 108 |