| 0,0 → 1,233 |
|---|
| #include "lux_TSL2561.h" |
| #include "defines.h" |
| #include "i2c.h" |
| #include <delays.h> |
| |
| static TSL2561_DATA *tsl2561_data_p; |
| |
| void LUX_Init(TSL2561_DATA *data, char address) { |
| tsl2561_data_p = data; |
| tsl2561_data_p->address = address; |
| tsl2561_data_p->integration = TSL2561_INTEGRATIONTIME_13MS; |
| tsl2561_data_p->gain = TSL2561_GAIN_16X; |
| } |
| |
| void LUX_Begin(void) { |
| char result, buffer[2]; |
| char toSend = TSL2561_REGISTER_ID; |
| DBG_PRINT_LUX("Sending %X to address %X\r\n", toSend, tsl2561_data_p->address); |
| I2C_Master_Send(tsl2561_data_p->address, 1, &toSend); |
| do { |
| result = I2C_Get_Status(); |
| } while (!result); |
| |
| I2C_Master_Recv(tsl2561_data_p->address, 1); |
| do { |
| result = I2C_Get_Status(); |
| } while (!result); |
| char length = I2C_Read_Buffer(buffer); |
| DBG_PRINT_LUX("Received %d bytes: ", length); |
| for (char i = 0; i < length; i++) { |
| DBG_PRINT_LUX("%c ", buffer[i]); |
| } |
| DBG_PRINT_LUX("\r\n"); |
| |
| // Set default integration time and gain |
| LUX_Set_Timing(tsl2561_data_p->integration); |
| LUX_Set_Gain(tsl2561_data_p->gain); |
| |
| // Start the chip in power-down mode |
| LUX_Disable(); |
| } |
| |
| void LUX_Enable() { |
| LUX_Write_2_Bytes(TSL2561_COMMAND_BIT | TSL2561_REGISTER_CONTROL, TSL2561_CONTROL_POWERON); |
| } |
| |
| void LUX_Disable() { |
| LUX_Write_2_Bytes(TSL2561_COMMAND_BIT | TSL2561_REGISTER_CONTROL, TSL2561_CONTROL_POWEROFF); |
| } |
| |
| void LUX_Set_Gain(tsl2561Gain_t gain) { |
| LUX_Enable(); |
| tsl2561_data_p->gain = gain; |
| LUX_Write_2_Bytes(TSL2561_COMMAND_BIT | TSL2561_REGISTER_TIMING, |
| tsl2561_data_p->integration | tsl2561_data_p->gain); |
| LUX_Disable(); |
| } |
| |
| void LUX_Set_Timing(tsl2561IntegrationTime_t integration) { |
| LUX_Enable(); |
| tsl2561_data_p->integration = integration; |
| LUX_Write_2_Bytes(TSL2561_COMMAND_BIT | TSL2561_REGISTER_TIMING, |
| tsl2561_data_p->integration | tsl2561_data_p->gain); |
| LUX_Disable(); |
| } |
| |
| unsigned long LUX_Calculate_Lux(unsigned int ch0, unsigned int ch1) { |
| unsigned long chScale, channel0, channel1, ratio1, ratio, temp, lux; |
| unsigned int b, m; |
| |
| switch (tsl2561_data_p->integration) { |
| case TSL2561_INTEGRATIONTIME_13MS: |
| chScale = TSL2561_LUX_CHSCALE_TINT0; |
| break; |
| case TSL2561_INTEGRATIONTIME_101MS: |
| chScale = TSL2561_LUX_CHSCALE_TINT1; |
| break; |
| default: // No scaling ... integration time = 402ms |
| chScale = (1 << TSL2561_LUX_CHSCALE); |
| break; |
| } |
| |
| // Scale for gain (1x or 16x) |
| if (!tsl2561_data_p->gain) |
| chScale = chScale << 4; |
| |
| // scale the channel values |
| channel0 = (ch0 * chScale) >> TSL2561_LUX_CHSCALE; |
| channel1 = (ch1 * chScale) >> TSL2561_LUX_CHSCALE; |
| |
| // find the ratio of the channel values (Channel1/Channel0) |
| ratio1 = 0; |
| if (channel0 != 0) |
| ratio1 = (channel1 << (TSL2561_LUX_RATIOSCALE+1)) / channel0; |
| |
| // round the ratio value |
| ratio = (ratio1 + 1) >> 1; |
| |
| #ifdef TSL2561_PACKAGE_CS |
| if ((ratio >= 0) && (ratio <= TSL2561_LUX_K1C)) { |
| b = TSL2561_LUX_B1C; m = TSL2561_LUX_M1C; |
| } else if (ratio <= TSL2561_LUX_K2C) { |
| b = TSL2561_LUX_B2C; m = TSL2561_LUX_M2C; |
| } else if (ratio <= TSL2561_LUX_K3C) { |
| b = TSL2561_LUX_B3C; m = TSL2561_LUX_M3C; |
| } else if (ratio <= TSL2561_LUX_K4C) { |
| b = TSL2561_LUX_B4C; m = TSL2561_LUX_M4C; |
| } else if (ratio <= TSL2561_LUX_K5C) { |
| b = TSL2561_LUX_B5C; m = TSL2561_LUX_M5C; |
| } else if (ratio <= TSL2561_LUX_K6C) { |
| b = TSL2561_LUX_B6C; m = TSL2561_LUX_M6C; |
| } else if (ratio <= TSL2561_LUX_K7C) { |
| b = TSL2561_LUX_B7C; m = TSL2561_LUX_M7C; |
| } else if (ratio > TSL2561_LUX_K8C) { |
| b = TSL2561_LUX_B8C; m = TSL2561_LUX_M8C; |
| } |
| #else |
| // if ((ratio >= 0) && (ratio <= TSL2561_LUX_K1T)) { |
| if ((ratio <= TSL2561_LUX_K1T)) { |
| b = TSL2561_LUX_B1T; m = TSL2561_LUX_M1T; |
| } else if (ratio <= TSL2561_LUX_K2T) { |
| b = TSL2561_LUX_B2T; m = TSL2561_LUX_M2T; |
| } else if (ratio <= TSL2561_LUX_K3T) { |
| b = TSL2561_LUX_B3T; m = TSL2561_LUX_M3T; |
| } else if (ratio <= TSL2561_LUX_K4T) { |
| b = TSL2561_LUX_B4T; m = TSL2561_LUX_M4T; |
| } else if (ratio <= TSL2561_LUX_K5T) { |
| b = TSL2561_LUX_B5T; m = TSL2561_LUX_M5T; |
| } else if (ratio <= TSL2561_LUX_K6T) { |
| b = TSL2561_LUX_B6T; m = TSL2561_LUX_M6T; |
| } else if (ratio <= TSL2561_LUX_K7T) { |
| b = TSL2561_LUX_B7T; m = TSL2561_LUX_M7T; |
| } else if (ratio > TSL2561_LUX_K8T) { |
| b = TSL2561_LUX_B8T; m = TSL2561_LUX_M8T; |
| } |
| #endif |
| |
| // temp = ((channel0 * b) - (channel1 * m)); |
| // TODO: change this back once they fix compiler |
| temp = (channel0 * b); |
| temp -= (channel1 * m); |
| |
| // // do not allow negative lux value |
| // if (temp < 0) |
| // temp = 0; |
| |
| // round lsb (2^(LUX_SCALE-1)) |
| temp += (1 << (TSL2561_LUX_LUXSCALE-1)); |
| |
| // strip off fractional portion |
| lux = temp >> TSL2561_LUX_LUXSCALE; |
| |
| return lux; |
| } |
| |
| unsigned long LUX_Get_Full_Luminosity() { |
| unsigned long x; |
| |
| // Enable the device by setting the control bit to 0x03 |
| LUX_Enable(); |
| |
| // Wait x ms for ADC to complete |
| switch (tsl2561_data_p->integration) { |
| case TSL2561_INTEGRATIONTIME_13MS: |
| Delay10KTCYx(67); |
| break; |
| case TSL2561_INTEGRATIONTIME_101MS: |
| Delay10KTCYx(255); |
| Delay10KTCYx(230); |
| break; |
| default: |
| Delay10KTCYx(255); |
| Delay10KTCYx(255); |
| Delay10KTCYx(255); |
| Delay10KTCYx(255); |
| Delay10KTCYx(255); |
| Delay10KTCYx(255); |
| Delay10KTCYx(255); |
| Delay10KTCYx(145); |
| break; |
| } |
| |
| x = LUX_Read_2_Bytes(TSL2561_COMMAND_BIT | TSL2561_WORD_BIT | TSL2561_REGISTER_CHAN1_LOW); |
| x <<= 16; |
| x |= LUX_Read_2_Bytes(TSL2561_COMMAND_BIT | TSL2561_WORD_BIT | TSL2561_REGISTER_CHAN0_LOW); |
| |
| LUX_Disable(); |
| |
| return x; |
| } |
| |
| unsigned int LUX_Get_Luminosity(char channel) { |
| unsigned long x = LUX_Get_Full_Luminosity(); |
| |
| if (channel == 0) { |
| // Reads two byte value from channel 0 (visible + infrared) |
| return (x & 0xFFFF); |
| } else if (channel == 1) { |
| // Reads two byte value from channel 1 (infrared) |
| return (x >> 16); |
| } else if (channel == 2) { |
| // Reads all and subtracts out just the visible! |
| return ( (x & 0xFFFF) - (x >> 16)); |
| } |
| |
| // Unknown channel! |
| return 0; |
| } |
| |
| void LUX_Write_2_Bytes(char reg, char value) { |
| char buffer[2], result; |
| buffer[0] = reg; |
| buffer[1] = value; |
| I2C_Master_Send(tsl2561_data_p->address, 2, buffer); |
| do { |
| result = I2C_Get_Status(); |
| } while (!result); |
| } |
| |
| unsigned int LUX_Read_2_Bytes(char reg) { |
| char result, length, buffer[2]; |
| unsigned int ret; |
| |
| I2C_Master_Restart(tsl2561_data_p->address, reg, 2); |
| do { |
| result = I2C_Get_Status(); |
| } while (!result); |
| length = I2C_Read_Buffer(buffer); |
| ret = buffer[1] << 8; |
| ret |= buffer[0]; |
| |
| return ret; |
| } |