diff options
Diffstat (limited to 'examples/imx7d_sdb_m4/demo_apps/sensor_demo/common/mpl3115.c')
| -rw-r--r-- | examples/imx7d_sdb_m4/demo_apps/sensor_demo/common/mpl3115.c | 151 |
1 files changed, 115 insertions, 36 deletions
diff --git a/examples/imx7d_sdb_m4/demo_apps/sensor_demo/common/mpl3115.c b/examples/imx7d_sdb_m4/demo_apps/sensor_demo/common/mpl3115.c index f5dcddb..55d15f9 100644 --- a/examples/imx7d_sdb_m4/demo_apps/sensor_demo/common/mpl3115.c +++ b/examples/imx7d_sdb_m4/demo_apps/sensor_demo/common/mpl3115.c @@ -34,49 +34,93 @@ #include "i2c_xfer.h" #include "mpl3115.h" -#define MPL3115_MPERCOUNT 0.0000152587890625F // 1/65536 fixed range for MPL3115 -#define MPL3115_CPERCPOUNT 0.00390625F // 1/256 fixed range for MPL3115 - /*FUNCTION**************************************************************** * -* Function Name : mpl3115_init +* Function Name : MPL3115_Init * Returned Value : result * Comments : Initialize MPL3115 pressure and temperature sensor. * *END*********************************************************************/ -bool mpl3115_init(pressure_sensor_t* pThisPressure) +bool MPL3115_Init(mpl_handle_t *handle, const mpl3115_init_t *mpl3115_config) { - uint8_t txBuffer; - uint8_t cmdBuffer[2]; + uint8_t regVal; + /* Place the MPL3115 in Standby */ + if (!MPL3115_WriteReg(handle, MPL3115_CTRL_REG1, 0x00)) + return false; - pThisPressure->fmPerCount = MPL3115_MPERCOUNT; - pThisPressure->fCPerCount = MPL3115_CPERCPOUNT; + // Set CTRL_REG1 according to mpl3115 init struct and switch it + // to active mode. + regVal = ((uint8_t)mpl3115_config->outputFormat | + (uint8_t)mpl3115_config->outputMode | + (uint8_t)mpl3115_config->oversampleRatio); - /* Place the MPL3115 in Standby */ - cmdBuffer[0] = MPL3115_ADDRESS << 1; - cmdBuffer[1] = MPL3115_CTRL_REG1; - txBuffer = 0x00; - if (!I2C_XFER_SendDataBlocking(cmdBuffer, 2, &txBuffer, 1)) + if (!MPL3115_WriteReg(handle, MPL3115_CTRL_REG1, regVal)) return false; - /* Enable Data Flags in PT_DATA_CFG */ - cmdBuffer[0] = MPL3115_ADDRESS << 1; - cmdBuffer[1] = MPL3115_PT_DATA_CFG; - txBuffer = 0x07; - if (!I2C_XFER_SendDataBlocking(cmdBuffer, 2, &txBuffer, 1)) + return true; +} + +/*FUNCTION**************************************************************** +* +* Function Name : MPL3115_Deinit +* Returned Value : result +* Comments : Deinit the mpl3115 sensor. +* +*END*********************************************************************/ +bool MPL3115_Deinit(mpl_handle_t *handle) +{ + // Switch mpl3115 to STANDBY mode. + if (!MPL3115_WriteReg(handle, MPL3115_CTRL_REG1, 0x00)) return false; - // write 1011 1001 = 0xB9 to configure MPL3115 and enter Active mode - // [7]: ALT=1 for altitude measurements - // [6]: RAW=0 to disable raw measurements - // [5-3]: OS=111 for OS ratio=128 for maximum internal averaging with 512ms output interval - // [2]: RST=0 do not enter reset - // [1]: OST=0 do not initiate a reading - // [0]: SBYB=1 to enter active mode - cmdBuffer[0] = MPL3115_ADDRESS << 1; - cmdBuffer[1] = MPL3115_CTRL_REG1; - txBuffer = 0xB9; - if (!I2C_XFER_SendDataBlocking(cmdBuffer, 2, &txBuffer, 1)) + // Reset all Register content. + if (!MPL3115_WriteReg(handle, MPL3115_CTRL_REG1, 0x04)) + return false; + + return true; +} + +/*FUNCTION**************************************************************** +* +* Function Name : MPL3115_Enable +* Returned Value : result +* Comments : Enable the MPL3115 sensor. +* +*END*********************************************************************/ +bool MPL3115_Enable(mpl_handle_t *handle) +{ + uint8_t regVal; + + if (!MPL3115_ReadReg(handle, MPL3115_CTRL_REG1, ®Val)) + return false; + + /* Active MPL3115 */ + regVal |= 0x01; + + if (!MPL3115_WriteReg(handle, MPL3115_CTRL_REG1, regVal)) + return false; + + return true; +} + +/*FUNCTION**************************************************************** +* +* Function Name : MPL3115_Disable +* Returned Value : result +* Comments : Disable the MPL3115 sensor. +* +*END*********************************************************************/ +bool MPL3115_Disable(mpl_handle_t *handle) +{ + uint8_t regVal; + + if (!MPL3115_ReadReg(handle, MPL3115_CTRL_REG1, ®Val)) + return false; + + /* De-active MPL3115 */ + regVal &= ~0x01; + + if (!MPL3115_WriteReg(handle, MPL3115_CTRL_REG1, regVal)) return false; return true; @@ -84,12 +128,47 @@ bool mpl3115_init(pressure_sensor_t* pThisPressure) /*FUNCTION**************************************************************** * -* Function Name : mpl3115_read_data +* Function Name : MPL3115_WriteReg +* Returned Value : result +* Comments : Write to MPL3115 single register. +* +*END*********************************************************************/ +bool MPL3115_WriteReg(mpl_handle_t *handle, uint8_t regAddr, uint8_t regVal) +{ + uint8_t cmdBuffer[2]; + + cmdBuffer[0] = MPL3115_ADDRESS << 1; + cmdBuffer[1] = regAddr; + + return I2C_XFER_SendDataBlocking(handle->device, cmdBuffer, 2, ®Val, 1); +} + +/*FUNCTION**************************************************************** +* +* Function Name : MPL3115_ReadReg +* Returned Value : result +* Comments : Read from MPL3115 single register. +* +*END*********************************************************************/ +bool MPL3115_ReadReg(mpl_handle_t *handle, uint8_t regAddr, uint8_t *regValPtr) +{ + uint8_t cmdBuffer[3]; + + cmdBuffer[0] = MPL3115_ADDRESS << 1; + cmdBuffer[1] = regAddr; + cmdBuffer[2] = (MPL3115_ADDRESS << 1) + 1; + + return I2C_XFER_ReceiveDataBlocking(handle->device, cmdBuffer, 3, regValPtr, 1); +} + +/*FUNCTION**************************************************************** +* +* Function Name : MPL3115_ReadData * Returned Value : result * Comments : Get current height and temperature from mpl3115. * *END*********************************************************************/ -bool mpl3115_read_data(pressure_sensor_t* pThisPressure) +bool MPL3115_ReadData(mpl_handle_t *handle, mpl3115_data_t *val) { uint8_t rxBuffer[5]; uint8_t cmdBuffer[3]; @@ -97,12 +176,12 @@ bool mpl3115_read_data(pressure_sensor_t* pThisPressure) cmdBuffer[0] = MPL3115_ADDRESS << 1; cmdBuffer[1] = MPL3115_OUT_P_MSB; cmdBuffer[2] = (MPL3115_ADDRESS << 1) + 1; - if (!I2C_XFER_ReceiveDataBlocking(cmdBuffer, 3, rxBuffer, 5)) + if (!I2C_XFER_ReceiveDataBlocking(handle->device, cmdBuffer, 3, rxBuffer, 5)) return false; - // place the read buffer into the 32 bit altitude and 16 bit temperature - pThisPressure->iHpFast = (rxBuffer[0] << 24) | (rxBuffer[1] << 16) | (rxBuffer[2] << 8); - pThisPressure->iTpFast = (rxBuffer[3] << 8) | rxBuffer[4]; + // place the read buffer into the 32 bit pressure/altitude and 16 bit temperature. + val->presData = (rxBuffer[0] << 24) | (rxBuffer[1] << 16) | (rxBuffer[2] << 8); + val->tempData = (rxBuffer[3] << 8) | rxBuffer[4]; return true; } |