128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*
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Copyright (C) 2014..2017 Marco Veeneman
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "ch.h"
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#include "hal.h"
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#include "chprintf.h"
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/* buffers depth */
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#define TEMP_RX_DEPTH 6
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#define TEMP_TX_DEPTH 6
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/* tmp275 specific addresses */
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#define TMP275_TEMP 0x00
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#define TMP275_CONF 0x01
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#define TMP275_TLOW 0x02
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#define TMP275_THIGH 0x03
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/* tmp275 config register */
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#define TMP275_CONF_SD 0x01
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#define TMP275_CONF_TM 0x02
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#define TMP275_CONF_POL 0x04
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#define TMP275_CONF_F0 0x08
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#define TMP275_CONF_F1 0x10
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#define TMP275_CONF_R0 0x20
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#define TMP275_CONF_R1 0x40
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#define TMP275_CONF_OS 0x80
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#define TMP275_ADDR 0b01001001
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static uint8_t rxbuf[TEMP_RX_DEPTH];
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static uint8_t txbuf[TEMP_TX_DEPTH];
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static i2cflags_t errors = 0;
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static uint16_t temperature;
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/* I2C configuration*/
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static const I2CConfig i2cfg =
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{
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400000
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};
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/*
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* Application entry point.
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*/
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int main(void)
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{
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msg_t status = MSG_OK;
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systime_t tmo = OSAL_MS2I(100);
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/*
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* System initializations.
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* - HAL initialization, this also initializes the configured device drivers
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* and performs the board-specific initializations.
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* - Kernel initialization, the main() function becomes a thread and the
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* RTOS is active.
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*/
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halInit();
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chSysInit();
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/* Configure RX and TX pins for UART0.*/
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palSetLineMode(LINE_UART0_RX, PAL_MODE_INPUT | PAL_MODE_ALTERNATE(1));
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palSetLineMode(LINE_UART0_TX, PAL_MODE_INPUT | PAL_MODE_ALTERNATE(1));
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/*
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* Start the serial driver with the default configuration.
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*/
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sdStart(&SD1, NULL);
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/* Configure SCK and SCL pins for I2C0.*/
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palSetLineMode(LINE_I2C0_SCL, PAL_MODE_OUTPUT_PUSHPULL | PAL_MODE_ALTERNATE(3));
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palSetLineMode(LINE_I2C0_SDA, PAL_MODE_OUTPUT_OPENDRAIN | PAL_MODE_ALTERNATE(3));
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/*
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* Start the i2c driver with the custom configuration.
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*/
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i2cStart(&I2CD1, &i2cfg);
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chprintf((BaseSequentialStream *)&SD1, "\r\n**********************\r\n");
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chprintf((BaseSequentialStream *)&SD1, "* TM4C123x I2C Demo. *\r\n");
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chprintf((BaseSequentialStream *)&SD1, "**********************\r\n\r\n");
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txbuf[0] = TMP275_CONF; // register address
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txbuf[1] = TMP275_CONF_R0 | TMP275_CONF_R1; // set conversion resolution to 12 bits
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i2cAcquireBus(&I2CD1);
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status = i2cMasterTransmitTimeout(&I2CD1, TMP275_ADDR, txbuf, 2, rxbuf, 0, tmo);
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i2cReleaseBus(&I2CD1);
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if (status != MSG_OK){
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errors = i2cGetErrors(&I2CD1);
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chprintf((BaseSequentialStream *)&SD1, "ERROR: errors detected.\r\n");
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}
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/*
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* Normal main() thread activity
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*/
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while (TRUE) {
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txbuf[0] = TMP275_TEMP; // register address
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i2cAcquireBus(&I2CD1);
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status = i2cMasterTransmitTimeout(&I2CD1, TMP275_ADDR, txbuf, 1, rxbuf, 2, tmo);
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i2cReleaseBus(&I2CD1);
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if (status != MSG_OK){
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errors = i2cGetErrors(&I2CD1);
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chprintf((BaseSequentialStream *)&SD1, "Status: %i\r\n", status);
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}
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else{
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temperature = (((rxbuf[0] << 8) | rxbuf[1]) >> 4);
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chprintf((BaseSequentialStream *)&SD1, "Temperature: %u,%4u\r\n", temperature >> 4, 625*(temperature & 0x0f));
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}
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chThdSleepMilliseconds(1000);
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}
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return 0;
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}
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