111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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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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/*
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* Timing values are taken from the RM except the PRESC set to 9 because
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* the input clock is 72MHz.
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* The timings are critical, please always refer to the STM32 Reference
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* Manual before attempting changes.
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*/
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#if 0
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static const I2CConfig i2cconfig = {
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STM32_TIMINGR_PRESC(8U) | /* 72MHz/9 = 8MHz I2CCLK. */
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STM32_TIMINGR_SCLDEL(3U) | STM32_TIMINGR_SDADEL(3U) |
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STM32_TIMINGR_SCLH(3U) | STM32_TIMINGR_SCLL(9U),
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0,
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0
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};
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#endif
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static const I2CConfig i2cconfig = {
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STM32_TIMINGR_PRESC(15U) |
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STM32_TIMINGR_SCLDEL(4U) | STM32_TIMINGR_SDADEL(2U) |
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STM32_TIMINGR_SCLH(15U) | STM32_TIMINGR_SCLL(21U),
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0,
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0
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};
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/*
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* This is a periodic thread that does absolutely nothing except flashing
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* a LED.
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*/
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static WORKING_AREA(blinker_wa, 128);
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static msg_t blinker(void *arg) {
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(void)arg;
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chRegSetThreadName("blinker");
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while (TRUE) {
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palSetPad(GPIOC, GPIOC_LED1);
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chThdSleepMilliseconds(500);
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palClearPad(GPIOC, GPIOC_LED1);
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chThdSleepMilliseconds(500);
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}
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return 0;
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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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* 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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/*
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* Starting the I2C driver 2.
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*/
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i2cStart(&I2CD2, &i2cconfig);
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/*
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* Starting the blinker thread.
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*/
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chThdCreateStatic(blinker_wa, sizeof(blinker_wa),
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NORMALPRIO-1, blinker, NULL);
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/*
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* Normal main() thread activity, in this demo it does nothing.
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*/
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while (TRUE) {
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unsigned i;
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msg_t msg;
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static const uint8_t cmd[] = {0, 0};
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uint8_t data[16];
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msg = i2cMasterTransmitTimeout(&I2CD2, 0x52, cmd, sizeof(cmd),
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data, sizeof(data), TIME_INFINITE);
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if (msg != RDY_OK)
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palTogglePad(GPIOC, GPIOC_LED3);
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for (i = 0; i < 256; i++) {
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msg = i2cMasterReceiveTimeout(&I2CD2, 0x52,
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data, sizeof(data), TIME_INFINITE);
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if (msg != RDY_OK)
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palTogglePad(GPIOC, GPIOC_LED3);
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}
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chThdSleepMilliseconds(500);
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palTogglePad(GPIOC, GPIOC_LED2);
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}
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return 0;
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}
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