Add i2c_stts75_sensor example.
Thanks Thomas Otto <tommi@viadmin.org> for the patch!
This commit is contained in:
Uwe Hermann
parent
f514162134
commit
46e5ed202a
@ -25,7 +25,7 @@ ifneq ($(V),1)
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Q := @
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Q := @
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endif
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endif
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all: stm32-h103 mb525
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all: stm32-h103 mb525 other
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stm32-h103:
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stm32-h103:
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@printf " BUILD examples/stm32-h103\n"
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@printf " BUILD examples/stm32-h103\n"
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@ -35,11 +35,17 @@ mb525:
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@printf " BUILD examples/mb525\n"
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@printf " BUILD examples/mb525\n"
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$(Q)$(MAKE) -C mb525
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$(Q)$(MAKE) -C mb525
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other:
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@printf " BUILD examples/other\n"
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$(Q)$(MAKE) -C other
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clean:
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clean:
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@printf " CLEAN examples/stm32-h103\n"
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@printf " CLEAN examples/stm32-h103\n"
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$(Q)$(MAKE) -C stm32-h103 clean
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$(Q)$(MAKE) -C stm32-h103 clean
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@printf " CLEAN examples/mb525\n"
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@printf " CLEAN examples/mb525\n"
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$(Q)$(MAKE) -C mb525 clean
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$(Q)$(MAKE) -C mb525 clean
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@printf " CLEAN examples/other\n"
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$(Q)$(MAKE) -C other clean
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.PHONY: stm32-h103 mb525 clean
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.PHONY: stm32-h103 mb525 other clean
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39
examples/other/Makefile
Normal file
39
examples/other/Makefile
Normal file
@ -0,0 +1,39 @@
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##
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## This file is part of the libopenstm32 project.
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##
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## Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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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,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program. If not, see <http://www.gnu.org/licenses/>.
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##
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# Do not print "Entering directory ...".
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MAKEFLAGS += --no-print-directory
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# Be silent per default, but 'make V=1' will show all compiler calls.
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ifneq ($(V),1)
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Q := @
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endif
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all: i2c_stts75_sensor
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i2c_stts75_sensor:
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@printf " BUILD i2c_stts75_sensor\n"
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$(Q)$(MAKE) -C i2c_stts75_sensor
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clean:
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@printf " CLEAN i2c_stts75_sensor\n"
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$(Q)$(MAKE) -C i2c_stts75_sensor clean
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.PHONY: i2c_stts75_sensor clean
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95
examples/other/i2c_stts75_sensor/Makefile
Normal file
95
examples/other/i2c_stts75_sensor/Makefile
Normal file
@ -0,0 +1,95 @@
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##
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## This file is part of the libopenstm32 project.
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##
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## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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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,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = i2c_stts75_sensor
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# PREFIX ?= arm-none-eabi
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PREFIX ?= arm-elf
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CC = $(PREFIX)-gcc
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LD = $(PREFIX)-ld
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OBJCOPY = $(PREFIX)-objcopy
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OBJDUMP = $(PREFIX)-objdump
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# Uncomment this line if you want to use the installed (not local) library.
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# TOOLCHAIN_DIR = `dirname \`which $(CC)\``/../$(PREFIX)
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TOOLCHAIN_DIR = ../../..
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CFLAGS = -O0 -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include -fno-common \
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-mcpu=cortex-m3 -mthumb
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LDSCRIPT = $(BINARY).ld
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LDFLAGS = -L$(TOOLCHAIN_DIR)/lib -T$(LDSCRIPT) -nostartfiles
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OBJS = $(BINARY).o stts75.o
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OPENOCD_BASE = /usr
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OPENOCD = $(OPENOCD_BASE)/bin/openocd
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OPENOCD_SCRIPTS = $(OPENOCD_BASE)/share/openocd/scripts
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OPENOCD_FLASHER = $(OPENOCD_SCRIPTS)/interface/jtagkey.cfg
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OPENOCD_BOARD = $(OPENOCD_SCRIPTS)/target/stm32.cfg
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# Be silent per default, but 'make V=1' will show all compiler calls.
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ifneq ($(V),1)
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Q := @
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NULL := 2>/dev/null
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endif
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all: images
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images: $(BINARY)
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@printf " OBJCOPY $(BINARY).bin\n"
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$(Q)$(OBJCOPY) -Obinary $(BINARY) $(BINARY).bin
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@printf " OBJCOPY $(BINARY).hex\n"
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$(Q)$(OBJCOPY) -Oihex $(BINARY) $(BINARY).hex
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@printf " OBJCOPY $(BINARY).srec\n"
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$(Q)$(OBJCOPY) -Osrec $(BINARY) $(BINARY).srec
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@printf " OBJDUMP $(BINARY).list\n"
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$(Q)$(OBJDUMP) -S $(BINARY) > $(BINARY).list
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$(BINARY): $(OBJS) $(LDSCRIPT)
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@printf " LD $(subst $(shell pwd)/,,$(@))\n"
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$(Q)$(LD) $(LDFLAGS) -o $(BINARY) $(OBJS) -lopenstm32
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%.o: %.c Makefile
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@printf " CC $(subst $(shell pwd)/,,$(@))\n"
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$(Q)$(CC) $(CFLAGS) -o $@ -c $<
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clean:
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@printf " CLEAN $(subst $(shell pwd)/,,$(OBJS))\n"
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$(Q)rm -f *.o
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@printf " CLEAN $(BINARY)\n"
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$(Q)rm -f $(BINARY)
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@printf " CLEAN $(BINARY).bin\n"
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$(Q)rm -f $(BINARY).bin
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@printf " CLEAN $(BINARY).hex\n"
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$(Q)rm -f $(BINARY).hex
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@printf " CLEAN $(BINARY).srec\n"
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$(Q)rm -f $(BINARY).srec
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@printf " CLEAN $(BINARY).list\n"
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$(Q)rm -f $(BINARY).list
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flash: images
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@printf " FLASH $(BINARY).bin\n"
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@# IMPORTANT: Don't use "resume", only "reset" will work correctly!
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$(Q)$(OPENOCD) -s $(OPENOCD_SCRIPTS) \
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-f $(OPENOCD_FLASHER) \
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-f $(OPENOCD_BOARD) \
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-c "init" -c "reset halt" \
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-c "flash write_image erase $(BINARY).hex" \
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-c "reset" \
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-c "shutdown" $(NULL)
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.PHONY: images clean
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49
examples/other/i2c_stts75_sensor/README
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49
examples/other/i2c_stts75_sensor/README
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@ -0,0 +1,49 @@
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This example program sends some characters on USART1.
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Afterwards it connects to an STTS75 sensor (ST LM75 compatible)
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at adress A0/1/2=0 and sets reverse polarity, 26 degree Tos and Thyst.
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It reads out the temperature and submits the temperature over USART1 in
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binary format (ASCII 0/1).
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The terminal settings for the receiving device/PC are 115200 8n1.
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Building
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--------
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$ make
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Running 'make' on the top-level libopenstm32 directory will automatically
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also build this example. Or you can build the library "manually" and
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then run 'make' in this directory.
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You may want to override the toolchain (e.g., arm-elf or arm-none-eabi):
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$ PREFIX=arm-none-eabi make
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For a more verbose build you can use
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$ make V=1
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Flashing
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--------
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You can flash the generated code using OpenOCD:
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$ make flash
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Or you can do the same manually via:
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$ openocd -f interface/jtagkey-tiny.cfg -f target/stm32.cfg
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$ telnet localhost 4444
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> reset halt
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> flash write_image erase i2c_stts75_sensor.hex
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> reset
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Replace the "jtagkey-tiny.cfg" with whatever JTAG device you are using, and/or
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replace "stm.cfg" with your respective config file.
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152
examples/other/i2c_stts75_sensor/i2c_stts75_sensor.c
Normal file
152
examples/other/i2c_stts75_sensor/i2c_stts75_sensor.c
Normal file
@ -0,0 +1,152 @@
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/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopenstm32/rcc.h>
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#include <libopenstm32/flash.h>
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#include <libopenstm32/gpio.h>
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#include <libopenstm32/usart.h>
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#include <libopenstm32/i2c.h>
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#include "stts75.h"
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/* Set STM32 to 72 MHz. */
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void clock_setup(void)
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{
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rcc_clock_setup_in_hse_8mhz_out_72mhz();
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}
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void usart_setup(void)
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{
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/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPAEN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, USART1EN);
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/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
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/* Setup UART parameters. */
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usart_set_baudrate(USART1, 115200);
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usart_set_databits(USART1, 8);
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usart_set_stopbits(USART1, USART_STOPBITS_1);
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usart_set_mode(USART1, USART_MODE_TX_RX);
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usart_set_parity(USART1, USART_PARITY_NONE);
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usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART1);
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}
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void gpio_setup(void)
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{
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/* Enable GPIOB clock. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPBEN);
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/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
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}
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void i2c_setup(void)
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{
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/* Enable clocks for I2C2 and AFIO. */
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rcc_peripheral_enable_clock(&RCC_APB1ENR, I2C2EN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, AFIOEN);
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/* Set alternate functions for the SCL and SDA pins of I2C2. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN,
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GPIO_I2C2_SCL | GPIO_I2C2_SDA);
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/* Disable the I2C before changing any configuration. */
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i2c_peripheral_disable(I2C2);
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/* APB1 is running at 36MHz. */
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i2c_set_clock_frequency(I2C2, I2C_CR2_FREQ_36MHZ);
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/* 400KHz - I2C Fast Mode */
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i2c_set_fast_mode(I2C2);
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/*
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* fclock for I2C is 36MHz APB2 -> cycle time 28ns, low time at 400KHz
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* incl trise -> Thigh= 1600ns; CCR= tlow/tcycle= 0x1C,9;
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* datasheet suggests 0x1e.
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*/
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i2c_set_ccr(I2C2, 0x1e);
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/*
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* fclock for I2C is 36MHz -> cycle time 28ns, rise time for
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* 400KHz => 300ns and 100KHz => 1000ns; 300ns/28ns = 10;
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* incremented by 1 -> 11.
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*/
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i2c_set_trise(I2C2, 0x0b);
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/*
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* This is our slave address - needed only if we want to receive from
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* other masters.
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*/
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i2c_set_own_7bit_slave_address(I2C2, 0x32);
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/* If everything is configured -> enable the peripheral. */
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i2c_peripheral_enable(I2C2);
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}
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int main(void)
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{
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int i = 0;
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u16 temperature;
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clock_setup();
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gpio_setup();
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usart_setup();
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i2c_setup();
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gpio_clear(GPIOB, GPIO7); /* LED1 on */
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gpio_set(GPIOB, GPIO6); /* LED2 off */
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/* Send a message on USART1. */
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usart_send(USART1, 's');
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usart_send(USART1, 't');
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usart_send(USART1, 'm');
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usart_send(USART1, '\r');
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usart_send(USART1, '\n');
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stts75_write_config(I2C2, STTS75_SENSOR0);
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stts75_write_temp_os(I2C2, STTS75_SENSOR0, 0x1a00); /* 26 degrees */
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stts75_write_temp_hyst(I2C2, STTS75_SENSOR0, 0x1a00);
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temperature = stts75_read_temperature(I2C2, STTS75_SENSOR0);
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/* Send the temperature as binary over USART1. */
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for (i = 15; i >= 0 ; i--) {
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if (temperature & (1 << i))
|
||||||
|
usart_send(USART1, '1');
|
||||||
|
else
|
||||||
|
usart_send(USART1, '0');
|
||||||
|
}
|
||||||
|
|
||||||
|
usart_send(USART1, '\r');
|
||||||
|
usart_send(USART1, '\n');
|
||||||
|
|
||||||
|
gpio_clear(GPIOB, GPIO6); /* LED2 on */
|
||||||
|
|
||||||
|
while(1); /* Halt. */
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
31
examples/other/i2c_stts75_sensor/i2c_stts75_sensor.ld
Normal file
31
examples/other/i2c_stts75_sensor/i2c_stts75_sensor.ld
Normal file
@ -0,0 +1,31 @@
|
|||||||
|
/*
|
||||||
|
* This file is part of the libopenstm32 project.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
|
||||||
|
*
|
||||||
|
* This program is free software: you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License as published by
|
||||||
|
* the Free Software Foundation, either version 3 of the License, or
|
||||||
|
* (at your option) any later version.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful,
|
||||||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
* GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License
|
||||||
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Linker script for an STM32F103RBT6 board (128K flash, 20K RAM). */
|
||||||
|
|
||||||
|
/* Define memory regions. */
|
||||||
|
MEMORY
|
||||||
|
{
|
||||||
|
rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
|
||||||
|
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Include the common ld script from libopenstm32. */
|
||||||
|
INCLUDE libopenstm32.ld
|
||||||
|
|
||||||
186
examples/other/i2c_stts75_sensor/stts75.c
Normal file
186
examples/other/i2c_stts75_sensor/stts75.c
Normal file
@ -0,0 +1,186 @@
|
|||||||
|
/*
|
||||||
|
* This file is part of the libopenstm32 project.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
|
||||||
|
*
|
||||||
|
* This program is free software: you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License as published by
|
||||||
|
* the Free Software Foundation, either version 3 of the License, or
|
||||||
|
* (at your option) any later version.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful,
|
||||||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
* GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License
|
||||||
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <libopenstm32/i2c.h>
|
||||||
|
#include "stts75.h"
|
||||||
|
|
||||||
|
void stts75_write_config(u32 i2c, u8 sensor)
|
||||||
|
{
|
||||||
|
u32 tempreg;
|
||||||
|
|
||||||
|
/* Send START condition. */
|
||||||
|
i2c_send_start(i2c);
|
||||||
|
|
||||||
|
/* Waiting for START is send and switched to master mode. */
|
||||||
|
while (!((I2C_SR1(i2c) & I2C_SR1_SB)
|
||||||
|
& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
|
||||||
|
|
||||||
|
/* Send destination address. */
|
||||||
|
i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
|
||||||
|
|
||||||
|
/* Waiting for address is transferred. */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
|
||||||
|
|
||||||
|
/* Cleaning ADDR condition sequence. */
|
||||||
|
tempreg = I2C_SR2(i2c);
|
||||||
|
|
||||||
|
/* Sending the data. */
|
||||||
|
i2c_send_data(i2c, 0x1); /* stts75 config register */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_BTF)); /* Await ByteTransferedFlag. */
|
||||||
|
i2c_send_data(i2c, 0x4); /* pol reverse - LED glows if temp is below Tos/Thyst */
|
||||||
|
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE)));
|
||||||
|
|
||||||
|
/* Send STOP condition. */
|
||||||
|
i2c_send_stop(i2c);
|
||||||
|
}
|
||||||
|
|
||||||
|
void stts75_write_temp_os(u32 i2c, u8 sensor, u16 temp_os)
|
||||||
|
{
|
||||||
|
u32 tempreg;
|
||||||
|
|
||||||
|
/* Send START condition. */
|
||||||
|
i2c_send_start(i2c);
|
||||||
|
|
||||||
|
/* Waiting for START is send and switched to master mode. */
|
||||||
|
while (!((I2C_SR1(i2c) & I2C_SR1_SB)
|
||||||
|
& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
|
||||||
|
|
||||||
|
/* Send destination address. */
|
||||||
|
i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
|
||||||
|
|
||||||
|
/* Waiting for address is transferred. */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
|
||||||
|
|
||||||
|
/* Cleaning ADDR condition sequence. */
|
||||||
|
tempreg = I2C_SR2(i2c);
|
||||||
|
|
||||||
|
/* Sending the data. */
|
||||||
|
i2c_send_data(i2c, 0x3); /* OvertemperatureShutdown register */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
|
||||||
|
i2c_send_data(i2c, (u8)(temp_os >> 8)); /* MSB */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
|
||||||
|
i2c_send_data(i2c, (u8)(temp_os & 0xff00)); /* LSB */
|
||||||
|
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); /* After the last byte we have to wait for TxE too. */
|
||||||
|
|
||||||
|
/* Send STOP condition. */
|
||||||
|
i2c_send_stop(i2c);
|
||||||
|
}
|
||||||
|
|
||||||
|
void stts75_write_temp_hyst(u32 i2c, u8 sensor, u16 temp_hyst)
|
||||||
|
{
|
||||||
|
u32 tempreg;
|
||||||
|
|
||||||
|
/* Send START condition. */
|
||||||
|
i2c_send_start(i2c);
|
||||||
|
|
||||||
|
/* Waiting for START is send and therefore switched to master mode. */
|
||||||
|
while (!((I2C_SR1(i2c) & I2C_SR1_SB)
|
||||||
|
& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
|
||||||
|
|
||||||
|
/* Say to what address we want to talk to. */
|
||||||
|
i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
|
||||||
|
|
||||||
|
/* Waiting for address is transferred. */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
|
||||||
|
|
||||||
|
/* Cleaning ADDR condition sequence. */
|
||||||
|
tempreg = I2C_SR2(i2c);
|
||||||
|
|
||||||
|
/* Sending the data. */
|
||||||
|
i2c_send_data(i2c, 0x2); /* TemperatureHysteresis register */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
|
||||||
|
i2c_send_data(i2c, (u8)(temp_hyst >> 8)); /* MSB */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
|
||||||
|
i2c_send_data(i2c, (u8)(temp_hyst & 0xff00)); /* LSB */
|
||||||
|
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); /* After the last byte we have to wait for TxE too. */
|
||||||
|
|
||||||
|
/* Send STOP condition. */
|
||||||
|
i2c_send_stop(i2c);
|
||||||
|
}
|
||||||
|
|
||||||
|
u16 stts75_read_temperature(u32 i2c, u8 sensor)
|
||||||
|
{
|
||||||
|
u32 tempreg;
|
||||||
|
u16 temperature;
|
||||||
|
|
||||||
|
/* Send START condition. */
|
||||||
|
i2c_send_start(i2c);
|
||||||
|
|
||||||
|
/* Waiting for START is send and switched to master mode. */
|
||||||
|
while (!((I2C_SR1(i2c) & I2C_SR1_SB)
|
||||||
|
& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
|
||||||
|
|
||||||
|
/* Say to what address we want to talk to. */
|
||||||
|
/* Yes, WRITE is correct - for selecting register in STTS75. */
|
||||||
|
i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
|
||||||
|
|
||||||
|
/* Waiting for address is transferred. */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
|
||||||
|
|
||||||
|
/* Cleaning ADDR condition sequence. */
|
||||||
|
tempreg = I2C_SR2(i2c);
|
||||||
|
|
||||||
|
i2c_send_data(i2c, 0x0); /* temperature register */
|
||||||
|
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF|I2C_SR1_TxE)));
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Now we transferred that we want to ACCESS the temperature register.
|
||||||
|
* Now we send another START condition (repeated START) and then
|
||||||
|
* transfer the destination but with flag READ.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Send START condition. */
|
||||||
|
i2c_send_start(i2c);
|
||||||
|
|
||||||
|
/* Waiting for START is send and switched to master mode. */
|
||||||
|
while (!((I2C_SR1(i2c) & I2C_SR1_SB)
|
||||||
|
& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
|
||||||
|
|
||||||
|
/* Say to what address we want to talk to. */
|
||||||
|
i2c_send_7bit_address(i2c, sensor, I2C_READ);
|
||||||
|
|
||||||
|
/* 2-byte receive is a special case. See datasheet POS bit. */
|
||||||
|
I2C_CR1(i2c) |= (I2C_CR1_POS | I2C_CR1_ACK);
|
||||||
|
|
||||||
|
/* Waiting for address is transferred. */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
|
||||||
|
|
||||||
|
/* Cleaning ADDR condition sequence. */
|
||||||
|
tempreg = I2C_SR2(i2c);
|
||||||
|
|
||||||
|
/* Cleaning I2C_SR1_ACK. */
|
||||||
|
I2C_CR1(i2c) &= ~ I2C_CR1_ACK;
|
||||||
|
|
||||||
|
/* Now the slave should begin to send us the first byte. Await BTF. */
|
||||||
|
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
|
||||||
|
temperature = (u16)(I2C_DR(i2c) << 8); /* MSB */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Yes they mean it: we have to generate the STOP condition before
|
||||||
|
* saving the 1st byte.
|
||||||
|
*/
|
||||||
|
I2C_CR1(i2c) |= I2C_CR1_STOP;
|
||||||
|
|
||||||
|
temperature |= I2C_DR(i2c); /* LSB */
|
||||||
|
|
||||||
|
/* Original state. */
|
||||||
|
I2C_CR1(i2c) &= ~I2C_CR1_POS;
|
||||||
|
|
||||||
|
return temperature;
|
||||||
|
}
|
||||||
39
examples/other/i2c_stts75_sensor/stts75.h
Normal file
39
examples/other/i2c_stts75_sensor/stts75.h
Normal file
@ -0,0 +1,39 @@
|
|||||||
|
/*
|
||||||
|
* This file is part of the libopenstm32 project.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
|
||||||
|
*
|
||||||
|
* This program is free software: you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License as published by
|
||||||
|
* the Free Software Foundation, either version 3 of the License, or
|
||||||
|
* (at your option) any later version.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful,
|
||||||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
* GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License
|
||||||
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef STTS75_H
|
||||||
|
#define STTS75_H
|
||||||
|
|
||||||
|
#include <stdint.h>
|
||||||
|
|
||||||
|
#define STTS75_SENSOR0 0x48
|
||||||
|
#define STTS75_SENSOR1 0x49
|
||||||
|
#define STTS75_SENSOR2 0x4a
|
||||||
|
#define STTS75_SENSOR3 0x4b
|
||||||
|
#define STTS75_SENSOR4 0x4c
|
||||||
|
#define STTS75_SENSOR5 0x4d
|
||||||
|
#define STTS75_SENSOR6 0x4e
|
||||||
|
#define STTS75_SENSOR7 0x4f
|
||||||
|
|
||||||
|
void stts75_write_config(u32 i2c, u8 sensor);
|
||||||
|
void stts75_write_temp_os(u32 i2c, u8 sensor, u16 temp_os);
|
||||||
|
void stts75_write_temp_hyst(u32 i2c, u8 sensor, u16 temp_hyst);
|
||||||
|
u16 stts75_read_temperature(u32 i2c, u8 sensor);
|
||||||
|
|
||||||
|
#endif
|
||||||
Loading…
x
Reference in New Issue
Block a user