First draft HMC5883 magnetometer sensor using physical quantities, outputting via serial port using std::cout on mbed os 5
hmc5883.cpp@2:9ffb2f18756b, 2020-03-24 (annotated)
- Committer:
- skyscraper
- Date:
- Tue Mar 24 15:21:34 2020 +0000
- Revision:
- 2:9ffb2f18756b
- Child:
- 3:2834be4e10ef
move hmc5883 code to separate source and header file
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
skyscraper | 2:9ffb2f18756b | 1 | |
skyscraper | 2:9ffb2f18756b | 2 | |
skyscraper | 2:9ffb2f18756b | 3 | #include "mbed.h" |
skyscraper | 2:9ffb2f18756b | 4 | #include <iostream> |
skyscraper | 2:9ffb2f18756b | 5 | #include <quan/out/magnetic_flux_density.hpp> |
skyscraper | 2:9ffb2f18756b | 6 | #include <quan/three_d/out/vect.hpp> |
skyscraper | 2:9ffb2f18756b | 7 | |
skyscraper | 2:9ffb2f18756b | 8 | namespace { |
skyscraper | 2:9ffb2f18756b | 9 | /* |
skyscraper | 2:9ffb2f18756b | 10 | 00 Configuration Register A R/W |
skyscraper | 2:9ffb2f18756b | 11 | 01 Configuration Register B R/W |
skyscraper | 2:9ffb2f18756b | 12 | 02 Mode Register R/W |
skyscraper | 2:9ffb2f18756b | 13 | 03 Data Output X MSB Register R |
skyscraper | 2:9ffb2f18756b | 14 | 04 Data Output X LSB Register R |
skyscraper | 2:9ffb2f18756b | 15 | 05 Data Output Z MSB Register R |
skyscraper | 2:9ffb2f18756b | 16 | 06 Data Output Z LSB Register R |
skyscraper | 2:9ffb2f18756b | 17 | 07 Data Output Y MSB Register R |
skyscraper | 2:9ffb2f18756b | 18 | 08 Data Output Y LSB Register R |
skyscraper | 2:9ffb2f18756b | 19 | 09 Status Register R |
skyscraper | 2:9ffb2f18756b | 20 | 10 Identification Register A R |
skyscraper | 2:9ffb2f18756b | 21 | 11 Identification Register B R |
skyscraper | 2:9ffb2f18756b | 22 | 12 Identification Register C R |
skyscraper | 2:9ffb2f18756b | 23 | */ |
skyscraper | 2:9ffb2f18756b | 24 | |
skyscraper | 2:9ffb2f18756b | 25 | I2C i2c(I2C_SDA, I2C_SCL ); |
skyscraper | 2:9ffb2f18756b | 26 | constexpr uint8_t i2c_addr = 0x3D; |
skyscraper | 2:9ffb2f18756b | 27 | constexpr char cfg_regA = 0; |
skyscraper | 2:9ffb2f18756b | 28 | constexpr char cfg_regB = 1; |
skyscraper | 2:9ffb2f18756b | 29 | constexpr char mode_reg = 2; |
skyscraper | 2:9ffb2f18756b | 30 | constexpr char dout_reg = 3; |
skyscraper | 2:9ffb2f18756b | 31 | constexpr char status_reg = 9; |
skyscraper | 2:9ffb2f18756b | 32 | constexpr char id_regA = 10U; |
skyscraper | 2:9ffb2f18756b | 33 | |
skyscraper | 2:9ffb2f18756b | 34 | // Set reg index to idx_in |
skyscraper | 2:9ffb2f18756b | 35 | // return true if successful |
skyscraper | 2:9ffb2f18756b | 36 | bool mag_set_reg_idx(uint8_t idx_in) |
skyscraper | 2:9ffb2f18756b | 37 | { |
skyscraper | 2:9ffb2f18756b | 38 | char const idx = static_cast<char>(idx_in); |
skyscraper | 2:9ffb2f18756b | 39 | bool const result = (i2c.write(i2c_addr,&idx,1) == 0); |
skyscraper | 2:9ffb2f18756b | 40 | if(result) { |
skyscraper | 2:9ffb2f18756b | 41 | return true; |
skyscraper | 2:9ffb2f18756b | 42 | } else { |
skyscraper | 2:9ffb2f18756b | 43 | std::cout << "mag_set_reg_idx failed\n"; |
skyscraper | 2:9ffb2f18756b | 44 | return false; |
skyscraper | 2:9ffb2f18756b | 45 | } |
skyscraper | 2:9ffb2f18756b | 46 | } |
skyscraper | 2:9ffb2f18756b | 47 | |
skyscraper | 2:9ffb2f18756b | 48 | // Write reg at idx with val |
skyscraper | 2:9ffb2f18756b | 49 | // return true if successful |
skyscraper | 2:9ffb2f18756b | 50 | bool mag_write_reg(uint8_t idx, uint8_t val) |
skyscraper | 2:9ffb2f18756b | 51 | { |
skyscraper | 2:9ffb2f18756b | 52 | char ar[2] = {idx,val}; |
skyscraper | 2:9ffb2f18756b | 53 | bool const result = (i2c.write(i2c_addr,ar,2) == 0); |
skyscraper | 2:9ffb2f18756b | 54 | if(result) { |
skyscraper | 2:9ffb2f18756b | 55 | return true; |
skyscraper | 2:9ffb2f18756b | 56 | } else { |
skyscraper | 2:9ffb2f18756b | 57 | std::cout << " mag_write_reg failed\n"; |
skyscraper | 2:9ffb2f18756b | 58 | return false; |
skyscraper | 2:9ffb2f18756b | 59 | } |
skyscraper | 2:9ffb2f18756b | 60 | } |
skyscraper | 2:9ffb2f18756b | 61 | |
skyscraper | 2:9ffb2f18756b | 62 | // Read reg at idx to result |
skyscraper | 2:9ffb2f18756b | 63 | // return true if successfull |
skyscraper | 2:9ffb2f18756b | 64 | bool mag_get_reg(uint8_t idx_in, uint8_t& result) |
skyscraper | 2:9ffb2f18756b | 65 | { |
skyscraper | 2:9ffb2f18756b | 66 | if ( mag_set_reg_idx(idx_in)) { |
skyscraper | 2:9ffb2f18756b | 67 | char result1 = 0; |
skyscraper | 2:9ffb2f18756b | 68 | if (i2c.read(i2c_addr,&result1,1) == 0) { |
skyscraper | 2:9ffb2f18756b | 69 | result = result1; |
skyscraper | 2:9ffb2f18756b | 70 | return true; |
skyscraper | 2:9ffb2f18756b | 71 | } else { |
skyscraper | 2:9ffb2f18756b | 72 | std::cout << "mag_get_reg read failed\n"; |
skyscraper | 2:9ffb2f18756b | 73 | return false; |
skyscraper | 2:9ffb2f18756b | 74 | } |
skyscraper | 2:9ffb2f18756b | 75 | } else { |
skyscraper | 2:9ffb2f18756b | 76 | return false; |
skyscraper | 2:9ffb2f18756b | 77 | } |
skyscraper | 2:9ffb2f18756b | 78 | } |
skyscraper | 2:9ffb2f18756b | 79 | |
skyscraper | 2:9ffb2f18756b | 80 | // Update value in reg using and and or masks |
skyscraper | 2:9ffb2f18756b | 81 | // reg <-- (reg & and_val) | or_val |
skyscraper | 2:9ffb2f18756b | 82 | // return true if successfull |
skyscraper | 2:9ffb2f18756b | 83 | bool mag_modify_reg(uint8_t idx, uint8_t and_val, uint8_t or_val) |
skyscraper | 2:9ffb2f18756b | 84 | { |
skyscraper | 2:9ffb2f18756b | 85 | uint8_t cur_val = 0; |
skyscraper | 2:9ffb2f18756b | 86 | if(mag_get_reg(idx,cur_val)) { |
skyscraper | 2:9ffb2f18756b | 87 | uint8_t const new_val = (cur_val & and_val ) | or_val; |
skyscraper | 2:9ffb2f18756b | 88 | return mag_write_reg(idx,new_val); |
skyscraper | 2:9ffb2f18756b | 89 | } else { |
skyscraper | 2:9ffb2f18756b | 90 | return false; |
skyscraper | 2:9ffb2f18756b | 91 | } |
skyscraper | 2:9ffb2f18756b | 92 | } |
skyscraper | 2:9ffb2f18756b | 93 | |
skyscraper | 2:9ffb2f18756b | 94 | } // namespace |
skyscraper | 2:9ffb2f18756b | 95 | |
skyscraper | 2:9ffb2f18756b | 96 | // probe for the HMC5883 on I2C |
skyscraper | 2:9ffb2f18756b | 97 | // return true if found |
skyscraper | 2:9ffb2f18756b | 98 | bool mag_detected() |
skyscraper | 2:9ffb2f18756b | 99 | { |
skyscraper | 2:9ffb2f18756b | 100 | if ( mag_set_reg_idx(id_regA) ) { |
skyscraper | 2:9ffb2f18756b | 101 | char id_input[4]; |
skyscraper | 2:9ffb2f18756b | 102 | if(i2c.read(i2c_addr,id_input,3) == 0) { |
skyscraper | 2:9ffb2f18756b | 103 | id_input[3] = '\0'; |
skyscraper | 2:9ffb2f18756b | 104 | bool const is_hmc = (strcmp(id_input,"H43") == 0); |
skyscraper | 2:9ffb2f18756b | 105 | if (is_hmc) { |
skyscraper | 2:9ffb2f18756b | 106 | return true; |
skyscraper | 2:9ffb2f18756b | 107 | } else { |
skyscraper | 2:9ffb2f18756b | 108 | std::cout << "hmc5883 ID string didnt match\n"; |
skyscraper | 2:9ffb2f18756b | 109 | return false; |
skyscraper | 2:9ffb2f18756b | 110 | } |
skyscraper | 2:9ffb2f18756b | 111 | } else { |
skyscraper | 2:9ffb2f18756b | 112 | std::cout << "id mag read failed\n"; |
skyscraper | 2:9ffb2f18756b | 113 | return false; |
skyscraper | 2:9ffb2f18756b | 114 | } |
skyscraper | 2:9ffb2f18756b | 115 | } else { |
skyscraper | 2:9ffb2f18756b | 116 | return false; |
skyscraper | 2:9ffb2f18756b | 117 | } |
skyscraper | 2:9ffb2f18756b | 118 | } |
skyscraper | 2:9ffb2f18756b | 119 | |
skyscraper | 2:9ffb2f18756b | 120 | // only 1,2,4,8 available |
skyscraper | 2:9ffb2f18756b | 121 | bool mag_set_samples_average(int n_samples) |
skyscraper | 2:9ffb2f18756b | 122 | { |
skyscraper | 2:9ffb2f18756b | 123 | uint8_t or_val = 0; |
skyscraper | 2:9ffb2f18756b | 124 | switch (n_samples) { |
skyscraper | 2:9ffb2f18756b | 125 | case 1 : |
skyscraper | 2:9ffb2f18756b | 126 | or_val = 0b00U << 5U; |
skyscraper | 2:9ffb2f18756b | 127 | break; |
skyscraper | 2:9ffb2f18756b | 128 | case 2 : |
skyscraper | 2:9ffb2f18756b | 129 | or_val = 0b01U << 5U; |
skyscraper | 2:9ffb2f18756b | 130 | break; |
skyscraper | 2:9ffb2f18756b | 131 | case 4 : |
skyscraper | 2:9ffb2f18756b | 132 | or_val = 0b10U << 5U; |
skyscraper | 2:9ffb2f18756b | 133 | break; |
skyscraper | 2:9ffb2f18756b | 134 | case 8 : |
skyscraper | 2:9ffb2f18756b | 135 | or_val = 0b11U << 5U; |
skyscraper | 2:9ffb2f18756b | 136 | break; |
skyscraper | 2:9ffb2f18756b | 137 | default: |
skyscraper | 2:9ffb2f18756b | 138 | std::cout << "mag_set_samples_average : invalid n_samples (" << n_samples << ")\n"; |
skyscraper | 2:9ffb2f18756b | 139 | return false; |
skyscraper | 2:9ffb2f18756b | 140 | } |
skyscraper | 2:9ffb2f18756b | 141 | uint8_t constexpr and_val = ~(0b11 << 5U); |
skyscraper | 2:9ffb2f18756b | 142 | return mag_modify_reg(cfg_regA,and_val,or_val); |
skyscraper | 2:9ffb2f18756b | 143 | } |
skyscraper | 2:9ffb2f18756b | 144 | |
skyscraper | 2:9ffb2f18756b | 145 | /* |
skyscraper | 2:9ffb2f18756b | 146 | data rate 0.75, 1.5, 3 ,7.5, 15 (Default) , 30, 75 |
skyscraper | 2:9ffb2f18756b | 147 | */ |
skyscraper | 2:9ffb2f18756b | 148 | namespace { |
skyscraper | 2:9ffb2f18756b | 149 | |
skyscraper | 2:9ffb2f18756b | 150 | template <int N, int D=1> struct mag_data_rate_id; |
skyscraper | 2:9ffb2f18756b | 151 | // values are mag settings for each data rate |
skyscraper | 2:9ffb2f18756b | 152 | template <> struct mag_data_rate_id<3,4> : std::integral_constant<uint8_t,(0b000U << 2U)> {}; |
skyscraper | 2:9ffb2f18756b | 153 | template <> struct mag_data_rate_id<3,2> : std::integral_constant<uint8_t,(0b001U << 2U)> {}; |
skyscraper | 2:9ffb2f18756b | 154 | template <> struct mag_data_rate_id<3> : std::integral_constant<uint8_t,(0b010U << 2U)> {}; |
skyscraper | 2:9ffb2f18756b | 155 | template <> struct mag_data_rate_id<15,2> : std::integral_constant<uint8_t,(0b011U << 2U)> {}; |
skyscraper | 2:9ffb2f18756b | 156 | template <> struct mag_data_rate_id<15> : std::integral_constant<uint8_t,(0b100U << 2U)> {}; |
skyscraper | 2:9ffb2f18756b | 157 | template <> struct mag_data_rate_id<30> : std::integral_constant<uint8_t,(0b101U << 2U)> {}; |
skyscraper | 2:9ffb2f18756b | 158 | template <> struct mag_data_rate_id<75> : std::integral_constant<uint8_t,(0b110U << 2U)> {}; |
skyscraper | 2:9ffb2f18756b | 159 | |
skyscraper | 2:9ffb2f18756b | 160 | }//namespace |
skyscraper | 2:9ffb2f18756b | 161 | |
skyscraper | 2:9ffb2f18756b | 162 | template <int N, int D> |
skyscraper | 2:9ffb2f18756b | 163 | bool mag_set_data_rate() |
skyscraper | 2:9ffb2f18756b | 164 | { |
skyscraper | 2:9ffb2f18756b | 165 | uint8_t constexpr and_val = static_cast<uint8_t>(~(0b111U << 2U)); |
skyscraper | 2:9ffb2f18756b | 166 | uint8_t constexpr or_val = mag_data_rate_id<N,D>::value; |
skyscraper | 2:9ffb2f18756b | 167 | return mag_modify_reg(cfg_regA,and_val,or_val); |
skyscraper | 2:9ffb2f18756b | 168 | } |
skyscraper | 2:9ffb2f18756b | 169 | |
skyscraper | 2:9ffb2f18756b | 170 | template bool mag_set_data_rate<3,4>(); |
skyscraper | 2:9ffb2f18756b | 171 | template bool mag_set_data_rate<3,2>(); |
skyscraper | 2:9ffb2f18756b | 172 | template bool mag_set_data_rate<3,1>(); |
skyscraper | 2:9ffb2f18756b | 173 | template bool mag_set_data_rate<15,2>(); |
skyscraper | 2:9ffb2f18756b | 174 | template bool mag_set_data_rate<15,1>(); |
skyscraper | 2:9ffb2f18756b | 175 | template bool mag_set_data_rate<30,1>(); |
skyscraper | 2:9ffb2f18756b | 176 | template bool mag_set_data_rate<75,1>(); |
skyscraper | 2:9ffb2f18756b | 177 | |
skyscraper | 2:9ffb2f18756b | 178 | namespace { |
skyscraper | 2:9ffb2f18756b | 179 | |
skyscraper | 2:9ffb2f18756b | 180 | bool mag_set_positive_bias() |
skyscraper | 2:9ffb2f18756b | 181 | { |
skyscraper | 2:9ffb2f18756b | 182 | uint8_t constexpr and_val = static_cast<uint8_t>(~(0b11U )); |
skyscraper | 2:9ffb2f18756b | 183 | uint8_t constexpr or_val = 0b01U; |
skyscraper | 2:9ffb2f18756b | 184 | return mag_modify_reg(cfg_regA,and_val,or_val); |
skyscraper | 2:9ffb2f18756b | 185 | } |
skyscraper | 2:9ffb2f18756b | 186 | |
skyscraper | 2:9ffb2f18756b | 187 | bool mag_set_negative_bias() |
skyscraper | 2:9ffb2f18756b | 188 | { |
skyscraper | 2:9ffb2f18756b | 189 | uint8_t constexpr and_val = static_cast<uint8_t>(~(0b11U )); |
skyscraper | 2:9ffb2f18756b | 190 | uint8_t constexpr or_val = 0b10U; |
skyscraper | 2:9ffb2f18756b | 191 | return mag_modify_reg(cfg_regA,and_val,or_val); |
skyscraper | 2:9ffb2f18756b | 192 | } |
skyscraper | 2:9ffb2f18756b | 193 | |
skyscraper | 2:9ffb2f18756b | 194 | bool mag_clear_bias() |
skyscraper | 2:9ffb2f18756b | 195 | { |
skyscraper | 2:9ffb2f18756b | 196 | uint8_t constexpr and_val = static_cast<uint8_t>(~(0b11U )); |
skyscraper | 2:9ffb2f18756b | 197 | uint8_t constexpr or_val = 0b00U; |
skyscraper | 2:9ffb2f18756b | 198 | return mag_modify_reg(cfg_regA,and_val,or_val); |
skyscraper | 2:9ffb2f18756b | 199 | } |
skyscraper | 2:9ffb2f18756b | 200 | |
skyscraper | 2:9ffb2f18756b | 201 | QUAN_QUANTITY_LITERAL(magnetic_flux_density,gauss); |
skyscraper | 2:9ffb2f18756b | 202 | QUAN_QUANTITY_LITERAL(magnetic_flux_density,milli_gauss); |
skyscraper | 2:9ffb2f18756b | 203 | QUAN_QUANTITY_LITERAL(magnetic_flux_density,uT); |
skyscraper | 2:9ffb2f18756b | 204 | |
skyscraper | 2:9ffb2f18756b | 205 | // per lsb defualt resolution |
skyscraper | 2:9ffb2f18756b | 206 | quan::magnetic_flux_density::uT mag_resolution = 0.92_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 207 | // range before saturation |
skyscraper | 2:9ffb2f18756b | 208 | quan::magnetic_flux_density::uT mag_range = 1.3_gauss; |
skyscraper | 2:9ffb2f18756b | 209 | } |
skyscraper | 2:9ffb2f18756b | 210 | |
skyscraper | 2:9ffb2f18756b | 211 | // set +- range |
skyscraper | 2:9ffb2f18756b | 212 | // sets the nearest greater equal +-range to abs(range_in) |
skyscraper | 2:9ffb2f18756b | 213 | bool mag_set_range(quan::magnetic_flux_density::uT const & range_in) |
skyscraper | 2:9ffb2f18756b | 214 | { |
skyscraper | 2:9ffb2f18756b | 215 | uint8_t or_value = 0; |
skyscraper | 2:9ffb2f18756b | 216 | auto const range = abs(range_in); |
skyscraper | 2:9ffb2f18756b | 217 | |
skyscraper | 2:9ffb2f18756b | 218 | if ( range <= 0.88_gauss) { |
skyscraper | 2:9ffb2f18756b | 219 | or_value = 0b001U << 5U ; |
skyscraper | 2:9ffb2f18756b | 220 | mag_range = 0.88_gauss; |
skyscraper | 2:9ffb2f18756b | 221 | mag_resolution = 0.73_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 222 | } else if (range <= 1.3_gauss) { |
skyscraper | 2:9ffb2f18756b | 223 | or_value = 0b001U << 5U ; |
skyscraper | 2:9ffb2f18756b | 224 | mag_range = 1.3_gauss; |
skyscraper | 2:9ffb2f18756b | 225 | mag_resolution = 0.92_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 226 | } else if (range <= 1.9_gauss) { |
skyscraper | 2:9ffb2f18756b | 227 | or_value = 0b010U << 5U ; |
skyscraper | 2:9ffb2f18756b | 228 | mag_range = 1.9_gauss; |
skyscraper | 2:9ffb2f18756b | 229 | mag_resolution = 1.22_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 230 | } else if (range <= 2.5_gauss) { |
skyscraper | 2:9ffb2f18756b | 231 | or_value = 0b011U << 5U ; |
skyscraper | 2:9ffb2f18756b | 232 | mag_range = 2.5_gauss; |
skyscraper | 2:9ffb2f18756b | 233 | mag_resolution = 1.52_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 234 | } else if (range <= 4.0_gauss) { |
skyscraper | 2:9ffb2f18756b | 235 | or_value = 0b100U << 5U ; |
skyscraper | 2:9ffb2f18756b | 236 | mag_range = 4.0_gauss; |
skyscraper | 2:9ffb2f18756b | 237 | mag_resolution = 2.27_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 238 | } else if (range <= 4.7_gauss) { |
skyscraper | 2:9ffb2f18756b | 239 | or_value = 0b101U << 5U ; |
skyscraper | 2:9ffb2f18756b | 240 | mag_range = 4.7_gauss; |
skyscraper | 2:9ffb2f18756b | 241 | mag_resolution = 2.56_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 242 | } else if (range <=5.6_gauss) { |
skyscraper | 2:9ffb2f18756b | 243 | or_value = 0b110U << 5U ; |
skyscraper | 2:9ffb2f18756b | 244 | mag_range = 5.6_gauss; |
skyscraper | 2:9ffb2f18756b | 245 | mag_resolution = 3.03_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 246 | } else if ( range <= 8.1_gauss) { |
skyscraper | 2:9ffb2f18756b | 247 | or_value = 0b111U << 5U ; |
skyscraper | 2:9ffb2f18756b | 248 | mag_range = 8.1_gauss; |
skyscraper | 2:9ffb2f18756b | 249 | mag_resolution = 4.35_milli_gauss; |
skyscraper | 2:9ffb2f18756b | 250 | } else { |
skyscraper | 2:9ffb2f18756b | 251 | quan::magnetic_flux_density::uT constexpr max_range = 8.1_gauss; |
skyscraper | 2:9ffb2f18756b | 252 | std::cout << "range too big: max +- range = " << max_range <<"\n"; |
skyscraper | 2:9ffb2f18756b | 253 | return false; |
skyscraper | 2:9ffb2f18756b | 254 | } |
skyscraper | 2:9ffb2f18756b | 255 | uint8_t constexpr and_val = static_cast<uint8_t>(~(0b111U << 5U)); |
skyscraper | 2:9ffb2f18756b | 256 | std::cout << "mag range set to : +- " << mag_range <<'\n'; |
skyscraper | 2:9ffb2f18756b | 257 | return mag_modify_reg(cfg_regB,and_val,or_value); |
skyscraper | 2:9ffb2f18756b | 258 | |
skyscraper | 2:9ffb2f18756b | 259 | } |
skyscraper | 2:9ffb2f18756b | 260 | |
skyscraper | 2:9ffb2f18756b | 261 | quan::magnetic_flux_density::uT |
skyscraper | 2:9ffb2f18756b | 262 | mag_get_range() |
skyscraper | 2:9ffb2f18756b | 263 | { |
skyscraper | 2:9ffb2f18756b | 264 | return mag_range; |
skyscraper | 2:9ffb2f18756b | 265 | } |
skyscraper | 2:9ffb2f18756b | 266 | |
skyscraper | 2:9ffb2f18756b | 267 | bool mag_set_continuous_measurement_mode() |
skyscraper | 2:9ffb2f18756b | 268 | { |
skyscraper | 2:9ffb2f18756b | 269 | uint8_t constexpr and_val = static_cast<uint8_t>(~(0b11U )); |
skyscraper | 2:9ffb2f18756b | 270 | uint8_t constexpr or_val = 0b00U; |
skyscraper | 2:9ffb2f18756b | 271 | return mag_modify_reg(mode_reg,and_val,or_val); |
skyscraper | 2:9ffb2f18756b | 272 | } |
skyscraper | 2:9ffb2f18756b | 273 | |
skyscraper | 2:9ffb2f18756b | 274 | bool mag_set_single_measurement_mode() |
skyscraper | 2:9ffb2f18756b | 275 | { |
skyscraper | 2:9ffb2f18756b | 276 | uint8_t constexpr and_val = static_cast<uint8_t>(~(0b11U )); |
skyscraper | 2:9ffb2f18756b | 277 | uint8_t constexpr or_val = 0b01U; |
skyscraper | 2:9ffb2f18756b | 278 | return mag_modify_reg(mode_reg,and_val,or_val); |
skyscraper | 2:9ffb2f18756b | 279 | } |
skyscraper | 2:9ffb2f18756b | 280 | |
skyscraper | 2:9ffb2f18756b | 281 | bool mag_set_idle_mode() |
skyscraper | 2:9ffb2f18756b | 282 | { |
skyscraper | 2:9ffb2f18756b | 283 | uint8_t constexpr and_val = static_cast<uint8_t>(~(0b11U )); |
skyscraper | 2:9ffb2f18756b | 284 | uint8_t constexpr or_val = 0b10U; |
skyscraper | 2:9ffb2f18756b | 285 | return mag_modify_reg(mode_reg,and_val,or_val); |
skyscraper | 2:9ffb2f18756b | 286 | } |
skyscraper | 2:9ffb2f18756b | 287 | |
skyscraper | 2:9ffb2f18756b | 288 | bool mag_data_ready() |
skyscraper | 2:9ffb2f18756b | 289 | { |
skyscraper | 2:9ffb2f18756b | 290 | uint8_t result = 0; |
skyscraper | 2:9ffb2f18756b | 291 | if ( mag_get_reg(status_reg, result)) { |
skyscraper | 2:9ffb2f18756b | 292 | return (result & 0b1U) != 0U; |
skyscraper | 2:9ffb2f18756b | 293 | } else { |
skyscraper | 2:9ffb2f18756b | 294 | std::cout << "mag data ready failed\n"; |
skyscraper | 2:9ffb2f18756b | 295 | return false; |
skyscraper | 2:9ffb2f18756b | 296 | } |
skyscraper | 2:9ffb2f18756b | 297 | } |
skyscraper | 2:9ffb2f18756b | 298 | |
skyscraper | 2:9ffb2f18756b | 299 | bool mag_data_locked() |
skyscraper | 2:9ffb2f18756b | 300 | { |
skyscraper | 2:9ffb2f18756b | 301 | uint8_t result = 0; |
skyscraper | 2:9ffb2f18756b | 302 | if ( mag_get_reg(status_reg, result)) { |
skyscraper | 2:9ffb2f18756b | 303 | return (result & 0b10U) != 0U; |
skyscraper | 2:9ffb2f18756b | 304 | } else { |
skyscraper | 2:9ffb2f18756b | 305 | std::cout << "mag data locked failed\n"; |
skyscraper | 2:9ffb2f18756b | 306 | return false; |
skyscraper | 2:9ffb2f18756b | 307 | } |
skyscraper | 2:9ffb2f18756b | 308 | } |
skyscraper | 2:9ffb2f18756b | 309 | |
skyscraper | 2:9ffb2f18756b | 310 | // assume mag_data_ready has returned true before call |
skyscraper | 2:9ffb2f18756b | 311 | bool mag_read(quan::three_d::vect<quan::magnetic_flux_density::uT> & v) |
skyscraper | 2:9ffb2f18756b | 312 | { |
skyscraper | 2:9ffb2f18756b | 313 | if( mag_set_reg_idx(dout_reg)) { |
skyscraper | 2:9ffb2f18756b | 314 | char arr[7]; |
skyscraper | 2:9ffb2f18756b | 315 | if(i2c.read(i2c_addr,arr,7) == 0) { |
skyscraper | 2:9ffb2f18756b | 316 | // TODO check status reg arr[6] |
skyscraper | 2:9ffb2f18756b | 317 | // if |
skyscraper | 2:9ffb2f18756b | 318 | quan::three_d::vect<int16_t> temp; |
skyscraper | 2:9ffb2f18756b | 319 | temp.x = static_cast<int16_t>(arr[1]) + ( static_cast<int16_t>(arr[0]) << 8U); |
skyscraper | 2:9ffb2f18756b | 320 | temp.y = static_cast<int16_t>(arr[5]) + ( static_cast<int16_t>(arr[4]) << 8U); |
skyscraper | 2:9ffb2f18756b | 321 | temp.z = static_cast<int16_t>(arr[3]) + ( static_cast<int16_t>(arr[2]) << 8U); |
skyscraper | 2:9ffb2f18756b | 322 | v = temp * mag_resolution; |
skyscraper | 2:9ffb2f18756b | 323 | return true; |
skyscraper | 2:9ffb2f18756b | 324 | } else { |
skyscraper | 2:9ffb2f18756b | 325 | std::cout << "mag_read failed\n"; |
skyscraper | 2:9ffb2f18756b | 326 | return false; |
skyscraper | 2:9ffb2f18756b | 327 | } |
skyscraper | 2:9ffb2f18756b | 328 | } else { |
skyscraper | 2:9ffb2f18756b | 329 | return false; |
skyscraper | 2:9ffb2f18756b | 330 | } |
skyscraper | 2:9ffb2f18756b | 331 | } |
skyscraper | 2:9ffb2f18756b | 332 | |
skyscraper | 2:9ffb2f18756b | 333 | bool mag_do_single_measurement(quan::three_d::vect<quan::magnetic_flux_density::uT>& result) |
skyscraper | 2:9ffb2f18756b | 334 | { |
skyscraper | 2:9ffb2f18756b | 335 | if ( ! mag_set_single_measurement_mode()) { |
skyscraper | 2:9ffb2f18756b | 336 | return false; |
skyscraper | 2:9ffb2f18756b | 337 | } |
skyscraper | 2:9ffb2f18756b | 338 | |
skyscraper | 2:9ffb2f18756b | 339 | while (! mag_data_ready()) { |
skyscraper | 2:9ffb2f18756b | 340 | ThisThread::sleep_for(5U); |
skyscraper | 2:9ffb2f18756b | 341 | } |
skyscraper | 2:9ffb2f18756b | 342 | return mag_read(result); |
skyscraper | 2:9ffb2f18756b | 343 | } |
skyscraper | 2:9ffb2f18756b | 344 | |
skyscraper | 2:9ffb2f18756b | 345 | namespace { |
skyscraper | 2:9ffb2f18756b | 346 | //TODO raname to mag_self_test |
skyscraper | 2:9ffb2f18756b | 347 | bool mag_get_offsets(quan::three_d::vect<quan::magnetic_flux_density::uT> & result) |
skyscraper | 2:9ffb2f18756b | 348 | { |
skyscraper | 2:9ffb2f18756b | 349 | // set single measurement mode |
skyscraper | 2:9ffb2f18756b | 350 | |
skyscraper | 2:9ffb2f18756b | 351 | // to prevent saturation |
skyscraper | 2:9ffb2f18756b | 352 | mag_set_range(5.7_gauss); |
skyscraper | 2:9ffb2f18756b | 353 | quan::three_d::vect<quan::magnetic_flux_density::uT> mSet; |
skyscraper | 2:9ffb2f18756b | 354 | // throw away first |
skyscraper | 2:9ffb2f18756b | 355 | mag_do_single_measurement(mSet); |
skyscraper | 2:9ffb2f18756b | 356 | |
skyscraper | 2:9ffb2f18756b | 357 | mag_set_positive_bias(); |
skyscraper | 2:9ffb2f18756b | 358 | mag_do_single_measurement(mSet); |
skyscraper | 2:9ffb2f18756b | 359 | std::cout << "mSet = " << mSet <<'\n'; |
skyscraper | 2:9ffb2f18756b | 360 | |
skyscraper | 2:9ffb2f18756b | 361 | mag_set_negative_bias(); |
skyscraper | 2:9ffb2f18756b | 362 | quan::three_d::vect<quan::magnetic_flux_density::uT> mReset; |
skyscraper | 2:9ffb2f18756b | 363 | mag_do_single_measurement(mReset); |
skyscraper | 2:9ffb2f18756b | 364 | mag_clear_bias(); |
skyscraper | 2:9ffb2f18756b | 365 | |
skyscraper | 2:9ffb2f18756b | 366 | std::cout << "mReset = " << mReset <<'\n'; |
skyscraper | 2:9ffb2f18756b | 367 | |
skyscraper | 2:9ffb2f18756b | 368 | result = (mSet - mReset )/2; |
skyscraper | 2:9ffb2f18756b | 369 | |
skyscraper | 2:9ffb2f18756b | 370 | std::cout << "result = " << result << '\n'; |
skyscraper | 2:9ffb2f18756b | 371 | |
skyscraper | 2:9ffb2f18756b | 372 | return true; |
skyscraper | 2:9ffb2f18756b | 373 | } |
skyscraper | 2:9ffb2f18756b | 374 | } // namepsace |