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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-06-15 16:38:10 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-06-15 16:38:10 +0000 |
| commit | 16f10822864c01278a4f8d450136f8d88f29f87e (patch) | |
| tree | 6c2442ca44cd090656ec3059ffb959f3d747e18d /testhal/STM32F1xx/I2C/tmp75.c | |
| parent | 19fb3cdc7e6116f91f28b86313dc640026511e18 (diff) | |
| download | ChibiOS-16f10822864c01278a4f8d450136f8d88f29f87e.tar.gz ChibiOS-16f10822864c01278a4f8d450136f8d88f29f87e.tar.bz2 ChibiOS-16f10822864c01278a4f8d450136f8d88f29f87e.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@5856 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'testhal/STM32F1xx/I2C/tmp75.c')
| -rw-r--r-- | testhal/STM32F1xx/I2C/tmp75.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/testhal/STM32F1xx/I2C/tmp75.c b/testhal/STM32F1xx/I2C/tmp75.c new file mode 100644 index 000000000..478c322fa --- /dev/null +++ b/testhal/STM32F1xx/I2C/tmp75.c @@ -0,0 +1,60 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+/**
+ * TMP75 is most simple I2C device in our case. It is already useful with
+ * default settings after powerup.
+ * You only must read 2 sequential bytes from it.
+ */
+
+#include <stdlib.h>
+
+#include "ch.h"
+#include "hal.h"
+
+#include "tmp75.h"
+
+
+/* input buffer */
+static uint8_t tmp75_rx_data[TMP75_RX_DEPTH];
+
+/* temperature value */
+static int16_t temperature = 0;
+
+static i2cflags_t errors = 0;
+
+#define tmp75_addr 0b1001000
+
+/* This is main function. */
+void request_temperature(void){
+ int16_t t_int = 0, t_frac = 0;
+ msg_t status = RDY_OK;
+ systime_t tmo = MS2ST(4);
+
+ i2cAcquireBus(&I2CD1);
+ status = i2cMasterReceiveTimeout(&I2CD1, tmp75_addr, tmp75_rx_data, 2, tmo);
+ i2cReleaseBus(&I2CD1);
+
+ if (status != RDY_OK){
+ errors = i2cGetErrors(&I2CD1);
+ }
+
+ t_int = tmp75_rx_data[0] * 100;
+ t_frac = (tmp75_rx_data[1] * 100) >> 8;
+ temperature = t_int + t_frac;
+}
+
+
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