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f74c6ffdd5
The STM32 I2C block has a number of errata associated with it.
These errata are primarily related to timing sensitivities between
the peripheral and the interrupt handler. In particular, the
correct generation of the stop bit relies on the I2C IRQ running
immediately and not being held off for any reason.
NOTE: The I2C interrupts must be the highest priority IRQs in the
system to ensure correct operation.
I2C protocol is now implemented as a formal state machine.
See: stm32_i2c_fsm.{dot,jpg} for FSM description.
I2C init is now expressed by const initializers in pios_board.c
for both OP and AHRS boards.
I2C device drivers (ie. bmp085/hmc5843) now pass in const arrays
of an unlimited number of bus transfers to be done atomically.
The I2C adapter driver now handles all bus-level locking across the
list of transactions. Generation of start/restart/stop conditions
are handled automatically over the list of transactions.
Timeouts have been removed from the API for now. May be added
back later.
This driver has run error free on both the OP and AHRS boards for
up to 48hrs but it still sometimes fails earlier than that on the OP
board. There is another possible set of improvements to the driver
that could employ the DMA engine for transfers of >= 2bytes. This
change would reduce the timing sensitivities between the peripheral
and the driver but unfortunately, both the SPI and I2C interfaces
share the DMA1 engine. That means only one of these two peripherals
can use the DMA engine and right now, SPI between OP and AHRS is
already using it.
Failures are currently fatal and will lock up the CPU. This allows
useful information to be obtained in the failure cases.
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@1241 ebee16cc-31ac-478f-84a7-5cbb03baadba
87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/**
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******************************************************************************
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* @addtogroup PIOS PIOS Core hardware abstraction layer
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* @{
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* @addtogroup PIOS_BMP085 BMP085 Functions
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* @brief Hardware functions to deal with the altitude pressure sensor
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* @{
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*
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* @file pios_bmp085.h
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief BMP085 functions header.
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PIOS_BMP085_H
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#define PIOS_BMP085_H
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/* BMP085 Addresses */
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#define BMP085_I2C_ADDR 0xEE
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#define BMP085_CALIB_ADDR 0xAA
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#define BMP085_CALIB_LEN 22
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#define BMP085_CTRL_ADDR 0xF4
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#define BMP085_OVERSAMPLING PIOS_BMP085_OVERSAMPLING
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#define BMP085_PRES_ADDR (0x34 + (BMP085_OVERSAMPLING << 6))
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#define BMP085_TEMP_ADDR 0x2E
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#define BMP085_ADC_MSB 0xF6
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#define BMP085_P0 101325
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/* Local Types */
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typedef struct {
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int16_t AC1;
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int16_t AC2;
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int16_t AC3;
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uint16_t AC4;
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uint16_t AC5;
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uint16_t AC6;
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int16_t B1;
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int16_t B2;
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int16_t MB;
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int16_t MC;
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int16_t MD;
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} BMP085CalibDataTypeDef;
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typedef enum {
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PressureConv,
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TemperatureConv
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} ConversionTypeTypeDef;
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/* Global Variables */
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#if defined(PIOS_INCLUDE_FREERTOS)
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extern xSemaphoreHandle PIOS_BMP085_EOC;
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#else
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extern int32_t PIOS_BMP085_EOC;
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#endif
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/* Public Functions */
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extern void PIOS_BMP085_Init(void);
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extern void PIOS_BMP085_StartADC(ConversionTypeTypeDef Type);
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extern void PIOS_BMP085_ReadADC(void);
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extern int16_t PIOS_BMP085_GetTemperature(void);
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extern int32_t PIOS_BMP085_GetPressure(void);
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extern bool PIOS_BMP085_Read(uint8_t address, uint8_t *buffer, uint8_t len);
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extern bool PIOS_BMP085_Write(uint8_t address, uint8_t buffer);
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#endif /* PIOS_BMP085_H */
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/**
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* @}
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* @}
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*/
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