1 files changed, 127 insertions, 0 deletions
diff --git a/ChibiOS_16.1.5/community/testhal/TIVA/TM4C123x/I2C/main.c b/ChibiOS_16.1.5/community/testhal/TIVA/TM4C123x/I2C/main.c
new file mode 100644
index 0000000..5f58176
--- /dev/null
+++ b/ChibiOS_16.1.5/community/testhal/TIVA/TM4C123x/I2C/main.c
@@ -0,0 +1,127 @@
+/*
+    Copyright (C) 2014..2016 Marco Veeneman
+
+    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.
+*/
+
+#include "ch.h"
+#include "hal.h"
+#include "chprintf.h"
+
+/* buffers depth */
+#define TEMP_RX_DEPTH 6
+#define TEMP_TX_DEPTH 6
+
+/* tmp275 specific addresses */
+#define TMP275_TEMP             0x00
+#define TMP275_CONF             0x01
+#define TMP275_TLOW             0x02
+#define TMP275_THIGH            0x03
+
+/* tmp275 config register */
+#define TMP275_CONF_SD          0x01
+#define TMP275_CONF_TM          0x02
+#define TMP275_CONF_POL         0x04
+#define TMP275_CONF_F0          0x08
+#define TMP275_CONF_F1          0x10
+#define TMP275_CONF_R0          0x20
+#define TMP275_CONF_R1          0x40
+#define TMP275_CONF_OS          0x80
+
+#define TMP275_ADDR             0b01001001
+
+static uint8_t rxbuf[TEMP_RX_DEPTH];
+static uint8_t txbuf[TEMP_TX_DEPTH];
+static i2cflags_t errors = 0;
+static uint16_t temperature;
+
+/* I2C configuration*/
+static const I2CConfig i2cfg =
+{
+    400000
+};
+
+/*
+ * Application entry point.
+ */
+int main(void)
+{
+  msg_t status = MSG_OK;
+  systime_t tmo = MS2ST(100);
+
+  /*
+   * System initializations.
+   * - HAL initialization, this also initializes the configured device drivers
+   *   and performs the board-specific initializations.
+   * - Kernel initialization, the main() function becomes a thread and the
+   *   RTOS is active.
+   */
+  halInit();
+  chSysInit();
+
+  /* Configure RX and TX pins for UART0.*/
+  palSetPadMode(GPIOA, GPIOA_UART0_RX, PAL_MODE_INPUT | PAL_MODE_ALTERNATE(1));
+  palSetPadMode(GPIOA, GPIOA_UART0_TX, PAL_MODE_INPUT | PAL_MODE_ALTERNATE(1));
+
+  /*
+   * Start the serial driver with the default configuration.
+   */
+  sdStart(&SD1, NULL);
+
+  /* Configure SCK and SCL pins for I2C0.*/
+  palSetPadMode(GPIOB, GPIOB_I2C0_SCL, PAL_MODE_OUTPUT_PUSHPULL | PAL_MODE_ALTERNATE(3));
+  palSetPadMode(GPIOB, GPIOB_I2C0_SDA, PAL_MODE_OUTPUT_OPENDRAIN | PAL_MODE_ALTERNATE(3));
+
+  /*
+   * Start the i2c driver with the custom configuration.
+   */
+  i2cStart(&I2CD1, &i2cfg);
+
+  chprintf((BaseSequentialStream *)&SD1, "\r\n**********************\r\n");
+  chprintf((BaseSequentialStream *)&SD1, "* TM4C123x I2C Demo. *\r\n");
+  chprintf((BaseSequentialStream *)&SD1, "**********************\r\n\r\n");
+
+  txbuf[0] = TMP275_CONF; // register address
+  txbuf[1] = TMP275_CONF_R0 | TMP275_CONF_R1; // set conversion resolution to 12 bits
+  i2cAcquireBus(&I2CD1);
+  status = i2cMasterTransmitTimeout(&I2CD1, TMP275_ADDR, txbuf, 2, rxbuf, 0, tmo);
+  i2cReleaseBus(&I2CD1);
+
+  if (status != MSG_OK){
+    errors = i2cGetErrors(&I2CD1);
+    chprintf((BaseSequentialStream *)&SD1, "ERROR: errors detected.\r\n");
+  }
+
+  /*
+   * Normal main() thread activity
+   */
+  while (TRUE) {
+    txbuf[0] = TMP275_TEMP; // register address
+    i2cAcquireBus(&I2CD1);
+    status = i2cMasterTransmitTimeout(&I2CD1, TMP275_ADDR, txbuf, 1, rxbuf, 2, tmo);
+    i2cReleaseBus(&I2CD1);
+
+    if (status != MSG_OK){
+      errors = i2cGetErrors(&I2CD1);
+      chprintf((BaseSequentialStream *)&SD1, "Status: %i\r\n", status);
+    }
+    else{
+      temperature = (((rxbuf[0] << 8) | rxbuf[1]) >> 4);
+      chprintf((BaseSequentialStream *)&SD1, "Temperature: %u,%4u\r\n", temperature >> 4, 625*(temperature & 0x0f));
+    }
+
+    chThdSleepMilliseconds(1000);
+  }
+  
+  return 0;
+}