1 files changed, 37 insertions, 0 deletions
diff --git a/testhal/STM32F1xx/I2C/tmp75.c b/testhal/STM32F1xx/I2C/tmp75.c
new file mode 100644
index 000000000..7acc8c668
--- /dev/null
+++ b/testhal/STM32F1xx/I2C/tmp75.c
@@ -0,0 +1,37 @@
+/**
+ * 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;
+
+
+#define tmp75_addr 0b1001000
+
+/* This is main function. */
+void request_temperature(void){
+  int16_t t_int = 0, t_frac = 0;
+
+  i2cAcquireBus(&I2CD1);
+  i2cMasterReceive(&I2CD1, tmp75_addr, tmp75_rx_data, 2);
+  i2cReleaseBus(&I2CD1);
+
+  t_int = tmp75_rx_data[0] * 100;
+  t_frac = (tmp75_rx_data[1] * 100) >> 8;
+  temperature = t_int + t_frac;
+}
+
+