From 4085ae3ddfbbf10c8ccbd3dccd43452c40a1fe40 Mon Sep 17 00:00:00 2001 From: Yuval Adam Date: Fri, 13 Mar 2015 12:24:52 +0200 Subject: Add bootloader, nfclib and sensorlib --- sensorlib/ak8975.c | 558 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 558 insertions(+) create mode 100644 sensorlib/ak8975.c (limited to 'sensorlib/ak8975.c') diff --git a/sensorlib/ak8975.c b/sensorlib/ak8975.c new file mode 100644 index 0000000..776229c --- /dev/null +++ b/sensorlib/ak8975.c @@ -0,0 +1,558 @@ +//***************************************************************************** +// +// ak8975.c - Driver for the AK8975 magnetometer. +// +// Copyright (c) 2013-2014 Texas Instruments Incorporated. All rights reserved. +// Software License Agreement +// +// Texas Instruments (TI) is supplying this software for use solely and +// exclusively on TI's microcontroller products. The software is owned by +// TI and/or its suppliers, and is protected under applicable copyright +// laws. You may not combine this software with "viral" open-source +// software in order to form a larger program. +// +// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS. +// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT +// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY +// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL +// DAMAGES, FOR ANY REASON WHATSOEVER. +// +// This is part of revision 2.1.0.12573 of the Tiva Firmware Development Package. +// +//***************************************************************************** + +#include +#include "sensorlib/hw_ak8975.h" +#include "sensorlib/i2cm_drv.h" +#include "sensorlib/ak8975.h" + +//***************************************************************************** +// +//! \addtogroup ak8975_api +//! @{ +// +//***************************************************************************** + +//***************************************************************************** +// +// The states of the AK8975 state machine. +// +//***************************************************************************** +#define AK8975_STATE_IDLE 0 // State machine is idle +#define AK8975_STATE_READ 1 // Waiting for read +#define AK8975_STATE_WRITE 2 // Waiting for write +#define AK8975_STATE_RMW 3 // Waiting for read-modify-write + +//***************************************************************************** +// +// Converting sensor data to tesla (0.3 uT per LSB) +// +//***************************************************************************** +#define CONVERT_TO_TESLA 0.0000003 + +//***************************************************************************** +// +// The callback function that is called when I2C transations to/from the +// AK8975 have completed. +// +//***************************************************************************** +static void +AK8975Callback(void *pvCallbackData, uint_fast8_t ui8Status) +{ + tAK8975 *psInst; + + // + // Convert the instance data into a pointer to a tAK8975 structure. + // + psInst = pvCallbackData; + + // + // If the I2C master driver encountered a failure, force the state machine + // to the idle state (which will also result in a callback to propagate the + // error). + // + if(ui8Status != I2CM_STATUS_SUCCESS) + { + psInst->ui8State = AK8975_STATE_IDLE; + } + + // + // Determine the current state of the AK8975 state machine. + // + switch(psInst->ui8State) + { + // + // All states that trivially transition to IDLE, and all unknown + // states. + // + case AK8975_STATE_READ: + case AK8975_STATE_WRITE: + case AK8975_STATE_RMW: + default: + { + // + // The state machine is now idle. + // + psInst->ui8State = AK8975_STATE_IDLE; + + // + // Done. + // + break; + } + } + + // + // See if the state machine is now idle and there is a callback function. + // + if((psInst->ui8State == AK8975_STATE_IDLE) && psInst->pfnCallback) + { + // + // Call the application-supplied callback function. + // + psInst->pfnCallback(psInst->pvCallbackData, ui8Status); + } +} + +//***************************************************************************** +// +//! Initializes the AK8975 driver. +//! +//! \param psInst is a pointer to the AK8975 instance data. +//! \param psI2CInst is a pointer to the I2C master driver instance data. +//! \param ui8I2CAddr is the I2C address of the AK8975 device. +//! \param pfnCallback is the function to be called when the initialization has +//! completed (can be \b NULL if a callback is not required). +//! \param pvCallbackData is a pointer that is passed to the callback function. +//! +//! This function initializes the AK8975 driver, preparing it for operation. +//! +//! \return Returns 1 if the AK8975 driver was successfully initialized and 0 +//! if it was not. +// +//***************************************************************************** +uint_fast8_t +AK8975Init(tAK8975 *psInst, tI2CMInstance *psI2CInst, uint_fast8_t ui8I2CAddr, + tSensorCallback *pfnCallback, void *pvCallbackData) +{ + // + // Initialize the AK8975 instance structure. + // + psInst->psI2CInst = psI2CInst; + psInst->ui8Addr = ui8I2CAddr; + psInst->ui8State = AK8975_STATE_IDLE; + + // + // The default settings are ok. Return success and call the callback. + // + if(pfnCallback) + { + pfnCallback(pvCallbackData, 0); + } + + // + // Success. + // + return(1); +} + +//***************************************************************************** +// +//! Reads data from AK8975 registers. +//! +//! \param psInst is a pointer to the AK8975 instance data. +//! \param ui8Reg is the first register to read. +//! \param pui8Data is a pointer to the location to store the data that is +//! read. +//! \param ui16Count is the number of data bytes to read. +//! \param pfnCallback is the function to be called when the data has been read +//! (can be \b NULL if a callback is not required). +//! \param pvCallbackData is a pointer that is passed to the callback function. +//! +//! This function reads a sequence of data values from consecutive registers in +//! the AK8975. +//! +//! \return Returns 1 if the write was successfully started and 0 if it was +//! not. +// +//***************************************************************************** +uint_fast8_t +AK8975Read(tAK8975 *psInst, uint_fast8_t ui8Reg, uint8_t *pui8Data, + uint_fast16_t ui16Count, tSensorCallback *pfnCallback, + void *pvCallbackData) +{ + // + // Return a failure if the AK8975 driver is not idle (in other words, there + // is already an outstanding request to the AK8975). + // + if(psInst->ui8State != AK8975_STATE_IDLE) + { + return(0); + } + + // + // Save the callback information. + // + psInst->pfnCallback = pfnCallback; + psInst->pvCallbackData = pvCallbackData; + + // + // Move the state machine to the wait for read state. + // + psInst->ui8State = AK8975_STATE_READ; + + // + // Read the requested registers from the AK8975. + // + psInst->uCommand.pui8Buffer[0] = ui8Reg; + if(I2CMRead(psInst->psI2CInst, psInst->ui8Addr, + psInst->uCommand.pui8Buffer, 1, pui8Data, ui16Count, + AK8975Callback, psInst) == 0) + { + // + // The I2C write failed, so move to the idle state and return a + // failure. + // + psInst->ui8State = AK8975_STATE_IDLE; + return(0); + } + + // + // Success. + // + return(1); +} + +//***************************************************************************** +// +//! Writes data to AK8975 registers. +//! +//! \param psInst is a pointer to the AK8975 instance data. +//! \param ui8Reg is the first register to write. +//! \param pui8Data is a pointer to the data to write. +//! \param ui16Count is the number of data bytes to write. +//! \param pfnCallback is the function to be called when the data has been +//! written (can be \b NULL if a callback is not required). +//! \param pvCallbackData is a pointer that is passed to the callback function. +//! +//! This function writes a sequence of data values to consecutive registers in +//! the AK8975. The first byte of the \e pui8Data buffer contains the value to +//! be written into the \e ui8Reg register, the second value contains the data +//! to be written into the next register, and so on. +//! +//! \return Returns 1 if the write was successfully started and 0 if it was +//! not. +// +//***************************************************************************** +uint_fast8_t +AK8975Write(tAK8975 *psInst, uint_fast8_t ui8Reg, uint8_t *pui8Data, + uint_fast16_t ui16Count, tSensorCallback *pfnCallback, + void *pvCallbackData) +{ + // + // Return a failure if the AK8975 driver is not idle (in other words, there + // is already an outstanding request to the AK8975). + // + if(psInst->ui8State != AK8975_STATE_IDLE) + { + return(0); + } + + // + // Save the callback information. + // + psInst->pfnCallback = pfnCallback; + psInst->pvCallbackData = pvCallbackData; + + // + // Move the state machine to the wait for write state. + // + psInst->ui8State = AK8975_STATE_WRITE; + + // + // Write the requested registers to the AK8975. + // + if(I2CMWrite8(&(psInst->uCommand.sWriteState), psInst->psI2CInst, + psInst->ui8Addr, ui8Reg, pui8Data, ui16Count, AK8975Callback, + psInst) == 0) + { + // + // The I2C write failed, so move to the idle state and return a + // failure. + // + psInst->ui8State = AK8975_STATE_IDLE; + return(0); + } + + // + // Success. + // + return(1); +} + +//***************************************************************************** +// +//! Performs a read-modify-write of an AK8975 register. +//! +//! \param psInst is a pointer to the AK8975 instance data. +//! \param ui8Reg is the register to modify. +//! \param ui8Mask is the bit mask that is ANDed with the current register +//! value. +//! \param ui8Value is the bit mask that is ORed with the result of the AND +//! operation. +//! \param pfnCallback is the function to be called when the data has been +//! changed (can be \b NULL if a callback is not required). +//! \param pvCallbackData is a pointer that is passed to the callback function. +//! +//! This function changes the value of a register in the AK8975 via a +//! read-modify-write operation, allowing one of the fields to be changed +//! without disturbing the other fields. The \e ui8Reg register is read, ANDed +//! with \e ui8Mask, ORed with \e ui8Value, and then written back to the +//! AK8975. +//! +//! \return Returns 1 if the read-modify-write was successfully started and 0 +//! if it was not. +// +//***************************************************************************** +uint_fast8_t +AK8975ReadModifyWrite(tAK8975 *psInst, uint_fast8_t ui8Reg, + uint_fast8_t ui8Mask, uint_fast8_t ui8Value, + tSensorCallback *pfnCallback, void *pvCallbackData) +{ + // + // Return a failure if the AK8975 driver is not idle (in other words, there + // is already an outstanding request to the AK8975). + // + if(psInst->ui8State != AK8975_STATE_IDLE) + { + return(0); + } + + // + // Save the callback information. + // + psInst->pfnCallback = pfnCallback; + psInst->pvCallbackData = pvCallbackData; + + // + // Move the state machine to the wait for read-modify-write state. + // + psInst->ui8State = AK8975_STATE_RMW; + + // + // Submit the read-modify-write request to the AK8975. + // + if(I2CMReadModifyWrite8(&(psInst->uCommand.sReadModifyWriteState), + psInst->psI2CInst, psInst->ui8Addr, ui8Reg, + ui8Mask, ui8Value, AK8975Callback, psInst) == 0) + { + // + // The I2C read-modify-write failed, so move to the idle state and + // return a failure. + // + psInst->ui8State = AK8975_STATE_IDLE; + return(0); + } + + // + // Success. + // + return(1); +} + +//***************************************************************************** +// +//! Reads the magnetometer data from the AK8975. +//! +//! \param psInst is a pointer to the AK8975 instance data. +//! \param pfnCallback is the function to be called when the data has been read +//! (can be \b NULL if a callback is not required). +//! \param pvCallbackData is a pointer that is passed to the callback function. +//! +//! This function initiates a read of the AK8975 data registers. When the +//! read has completed (as indicated by calling the callback function), the new +//! readings can be obtained via: +//! +//! - AK8975DataMagnetoGetRaw() +//! - AK8975DataMagnetoGetFloat() +//! +//! \return Returns 1 if the read was successfully started and 0 if it was not. +// +//***************************************************************************** +uint_fast8_t +AK8975DataRead(tAK8975 *psInst, tSensorCallback *pfnCallback, + void *pvCallbackData) +{ + // + // Return a failure if the AK8975 driver is not idle (in other words, there + // is already an outstanding request to the AK8975). + // + if(psInst->ui8State != AK8975_STATE_IDLE) + { + return(0); + } + + // + // Save the callback information. + // + psInst->pfnCallback = pfnCallback; + psInst->pvCallbackData = pvCallbackData; + + // + // Move the state machine to the wait for data read state. + // + psInst->ui8State = AK8975_STATE_READ; + + // + // Read the data registers from the AK8975. + // + // ST1 + (HXL + HXH) + (HYL + HYH) + (HZL + HZH) + ST2 = 8 bytes + // + psInst->pui8Data[0] = AK8975_O_ST1; + if(I2CMRead(psInst->psI2CInst, psInst->ui8Addr, psInst->pui8Data, 1, + psInst->pui8Data, 8, AK8975Callback, psInst) == 0) + { + // + // The I2C read failed, so move to the idle state and return a failure. + // + psInst->ui8State = AK8975_STATE_IDLE; + return(0); + } + + // + // Success. + // + return(1); +} + +//***************************************************************************** +// +//! Gets the raw magnetometer data from the most recent data read. +//! +//! \param psInst is a pointer to the AK8975 instance data. +//! \param pui16MagnetoX is a pointer to the value into which the raw X-axis +//! magnetometer data is stored. +//! \param pui16MagnetoY is a pointer to the value into which the raw Y-axis +//! magnetometer data is stored. +//! \param pui16MagnetoZ is a pointer to the value into which the raw Z-axis +//! magnetometer data is stored. +//! +//! This function returns the raw magnetometer data from the most recent data +//! read. The data is not manipulated in any way by the driver. If any of the +//! output data pointers are \b NULL, the corresponding data is not provided. +//! +//! \return None. +// +//***************************************************************************** +void +AK8975DataMagnetoGetRaw(tAK8975 *psInst, uint_fast16_t *pui16MagnetoX, + uint_fast16_t *pui16MagnetoY, + uint_fast16_t *pui16MagnetoZ) +{ + // + // Return the raw magnetometer values. + // + if(pui16MagnetoX) + { + *pui16MagnetoX = (psInst->pui8Data[2] << 8) | psInst->pui8Data[1]; + } + if(pui16MagnetoY) + { + *pui16MagnetoY = (psInst->pui8Data[4] << 8) | psInst->pui8Data[3]; + } + if(pui16MagnetoZ) + { + *pui16MagnetoZ = (psInst->pui8Data[6] << 8) | psInst->pui8Data[5]; + } +} + +//***************************************************************************** +// +//! Gets the magnetometer data from the most recent data read. +//! +//! \param psInst is a pointer to the AK8975 instance data. +//! \param pfMagnetoX is a pointer to the value into which the X-axis +//! magnetometer data is stored. +//! \param pfMagnetoY is a pointer to the value into which the Y-axis +//! magnetometer data is stored. +//! \param pfMagnetoZ is a pointer to the value into which the Z-axis +//! magnetometer data is stored. +//! +//! This function returns the magnetometer data from the most recent data read, +//! converted into tesla. If any of the output data pointers are +//! \b NULL, the corresponding data is not provided. +//! +//! \return None. +// +//***************************************************************************** +void +AK8975DataMagnetoGetFloat(tAK8975 *psInst, float *pfMagnetoX, + float *pfMagnetoY, float *pfMagnetoZ) +{ + // + // Convert the magnetometer values into floating-point tesla values. + // + if(pfMagnetoX) + { + *pfMagnetoX = ((float)(int16_t)((psInst->pui8Data[2] << 8) | + psInst->pui8Data[1]) * + CONVERT_TO_TESLA); + } + if(pfMagnetoY) + { + *pfMagnetoY = ((float)(int16_t)((psInst->pui8Data[4] << 8) | + psInst->pui8Data[3]) * + CONVERT_TO_TESLA); + } + if(pfMagnetoZ) + { + *pfMagnetoZ = ((float)(int16_t)((psInst->pui8Data[6] << 8) | + psInst->pui8Data[5]) * + CONVERT_TO_TESLA); + } +} + +//***************************************************************************** +// +//! Gets the status registers from the most recent data read. +//! +//! \param psInst is a pointer to the AK8975 instance data. +//! \param pui8Status1 is a pointer to the value into which the ST1 data is +//! stored. +//! \param pui8Status2 is a pointer to the value into which the ST2 data is +//! stored. +//! +//! This function returns the magnetometer status registers from the most +//! recent data read. If any of the output data pointers are \b NULL, the +//! corresponding data is not provided. +//! +//! Note that the AKM comp routines require ST1 and ST2, so we read +//! them for that reason. +//! +//! \return None. +// +//***************************************************************************** +void +AK8975DataGetStatus(tAK8975 *psInst, uint_fast8_t *pui8Status1, + uint_fast8_t *pui8Status2) +{ + // + // Return the status registers + // + if(pui8Status1) + { + *pui8Status1 = psInst->pui8Data[0]; + } + if(pui8Status2) + { + *pui8Status2 = psInst->pui8Data[7]; + } +} + +//***************************************************************************** +// +// Close the Doxygen group. +//! @} +// +//***************************************************************************** -- cgit v1.3.1