1 files changed, 72 insertions, 0 deletions
diff --git a/testhal/STM32/I2C/tmp75.c b/testhal/STM32/I2C/tmp75.c
new file mode 100644
index 000000000..4d9923881
--- /dev/null
+++ b/testhal/STM32/I2C/tmp75.c
@@ -0,0 +1,72 @@
+/**
+ * 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 i2cblock_t tmp75_rx_data[TMP75_RX_DEPTH];
+static i2cblock_t tmp75_tx_data[TMP75_TX_DEPTH];
+
+// Simple error trap
+static void i2c_tmp75_error_cb(I2CDriver *i2cp, I2CSlaveConfig *i2cscfg){
+  (void)i2cscfg;
+  int status = 0;
+  status = i2cp->id_i2c->SR1;
+  while(TRUE);
+}
+
+/* This callback raise up when transfer finished */
+static void i2c_tmp75_cb(I2CDriver *i2cp, I2CSlaveConfig *i2cscfg){
+  int16_t temperature = 0;
+
+  /* Manually send stop signal to the bus. This is important! */
+  i2cMasterStop(i2cp);
+  /* unlock bus */
+  i2cReleaseBus(&I2CD2);
+
+  /* store temperature value */
+  temperature = (i2cscfg->rxbuf[0] << 8) + i2cscfg->rxbuf[1];
+
+}
+
+// Fill TMP75 config.
+static I2CSlaveConfig tmp75 = {
+    i2c_tmp75_cb,
+    i2c_tmp75_error_cb,
+    tmp75_rx_data,
+    TMP75_RX_DEPTH,
+    0,
+    0,
+    tmp75_tx_data,
+    TMP75_TX_DEPTH,
+    0,
+    0,
+    0b1001000,
+    FALSE,
+};
+
+/* This is main function. */
+void request_temperature(void){
+  tmp75.txbytes = 0;  // set to zero just to be safe
+
+  /* tune receiving buffer */
+  tmp75.rxbufhead = 0;// point to beginig of buffer
+  tmp75.rxbytes = 2;  // we need read 2 bytes
+
+  /* get exclusive access to the bus */
+  i2cAcquireBus(&I2CD2);
+
+  /* start receiving process in background and return */
+  i2cMasterReceive(&I2CD2, &tmp75);
+}
+
+