214 lines
6.5 KiB
C
214 lines
6.5 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ch.h"
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#include "hal.h"
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#include "test.h"
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#include "lis302dl.h"
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/*
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* PWM configuration structure.
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* Cyclic callback enabled, channels 1 and 4 enabled without callbacks,
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* the active state is a logic one.
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*/
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static PWMConfig pwmcfg = {
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100000, /* 100kHz PWM clock frequency. */
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128, /* PWM period is 128 cycles. */
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NULL,
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{
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{PWM_OUTPUT_ACTIVE_HIGH, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL}
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},
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/* HW dependent part.*/
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0
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};
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/*
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* SPI1 configuration structure.
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* Speed 5.25MHz, CPHA=1, CPOL=1, 8bits frames, MSb transmitted first.
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* The slave select line is the pin GPIOE_CS_SPI on the port GPIOE.
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*/
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static const SPIConfig spi1cfg = {
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NULL,
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/* HW dependent part.*/
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GPIOE,
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GPIOE_CS_SPI,
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SPI_CR1_BR_0 | SPI_CR1_BR_1 | SPI_CR1_CPOL | SPI_CR1_CPHA
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};
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/*
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* SPI2 configuration structure.
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* Speed 21MHz, CPHA=0, CPOL=0, 8bits frames, MSb transmitted first.
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* The slave select line is the pin 12 on the port GPIOA.
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*/
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static const SPIConfig spi2cfg = {
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NULL,
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/* HW dependent part.*/
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GPIOB,
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12,
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0
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};
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/* Last accelerometer data.*/
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static int8_t xbuf[4], ybuf[4];
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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(waThread1, 128);
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static msg_t Thread1(void *arg) {
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systime_t time;
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(void)arg;
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chRegSetThreadName("reader");
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/* LIS302DL initialization.*/
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lis302dlWriteRegister(&SPID1, LIS302DL_CTRL_REG1, 0x43);
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lis302dlWriteRegister(&SPID1, LIS302DL_CTRL_REG2, 0x00);
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lis302dlWriteRegister(&SPID1, LIS302DL_CTRL_REG3, 0x00);
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/* Reader thread loop.*/
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time = chTimeNow();
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while (TRUE) {
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int32_t x, y;
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unsigned i;
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/* Keeping an history of the latest four accelerometer readings.*/
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for (i = 3; i > 0; i--) {
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xbuf[i] = xbuf[i - 1];
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ybuf[i] = ybuf[i - 1];
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}
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/* Reading MEMS accelerometer X and Y registers.*/
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xbuf[0] = (int8_t)lis302dlReadRegister(&SPID1, LIS302DL_OUTX);
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ybuf[0] = (int8_t)lis302dlReadRegister(&SPID1, LIS302DL_OUTY);
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/* Transmitting accelerometer the data over SPI2.*/
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spiSelect(&SPID2);
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spiSend(&SPID2, 4, xbuf);
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spiSend(&SPID2, 4, ybuf);
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spiUnselect(&SPID2);
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/* Calculating average of the latest four accelerometer readings.*/
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x = ((int32_t)xbuf[0] + (int32_t)xbuf[1] +
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(int32_t)xbuf[2] + (int32_t)xbuf[3]) / 4;
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y = ((int32_t)ybuf[0] + (int32_t)ybuf[1] +
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(int32_t)ybuf[2] + (int32_t)ybuf[3]) / 4;
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/* Reprogramming the four PWM channels using the accelerometer data.*/
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if (y < 0) {
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pwmEnableChannel(&PWMD4, 0, (pwmcnt_t)-y);
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pwmEnableChannel(&PWMD4, 2, (pwmcnt_t)0);
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}
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else {
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pwmEnableChannel(&PWMD4, 2, (pwmcnt_t)y);
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pwmEnableChannel(&PWMD4, 0, (pwmcnt_t)0);
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}
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if (x < 0) {
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pwmEnableChannel(&PWMD4, 1, (pwmcnt_t)-x);
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pwmEnableChannel(&PWMD4, 3, (pwmcnt_t)0);
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}
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else {
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pwmEnableChannel(&PWMD4, 3, (pwmcnt_t)x);
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pwmEnableChannel(&PWMD4, 1, (pwmcnt_t)0);
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}
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/* Waiting until the next 250 milliseconds time interval.*/
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chThdSleepUntil(time += MS2ST(100));
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}
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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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* Activates the serial driver 2 using the driver default configuration.
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* PA2(TX) and PA3(RX) are routed to USART2.
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*/
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sdStart(&SD2, NULL);
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palSetPadMode(GPIOA, 2, PAL_MODE_ALTERNATE(7));
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palSetPadMode(GPIOA, 3, PAL_MODE_ALTERNATE(7));
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/*
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* Initializes the SPI driver 1 in order to access the MEMS. The signals
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* are already initialized in the board file.
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*/
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spiStart(&SPID1, &spi1cfg);
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/*
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* Initializes the SPI driver 2. The SPI2 signals are routed as follow:
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* PB12 - NSS.
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* PB13 - SCK.
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* PB14 - MISO.
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* PB15 - MOSI.
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*/
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spiStart(&SPID2, &spi2cfg);
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palSetPad(GPIOB, 12);
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palSetPadMode(GPIOB, 12, PAL_MODE_OUTPUT_PUSHPULL |
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PAL_STM32_OSPEED_HIGHEST); /* NSS. */
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palSetPadMode(GPIOB, 13, PAL_MODE_ALTERNATE(5) |
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PAL_STM32_OSPEED_HIGHEST); /* SCK. */
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palSetPadMode(GPIOB, 14, PAL_MODE_ALTERNATE(5)); /* MISO. */
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palSetPadMode(GPIOB, 15, PAL_MODE_ALTERNATE(5) |
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PAL_STM32_OSPEED_HIGHEST); /* MOSI. */
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/*
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* Initializes the PWM driver 4, routes the TIM4 outputs to the board LEDs.
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*/
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pwmStart(&PWMD4, &pwmcfg);
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palSetPadMode(GPIOD, GPIOD_LED4, PAL_MODE_ALTERNATE(2)); /* Green. */
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palSetPadMode(GPIOD, GPIOD_LED3, PAL_MODE_ALTERNATE(2)); /* Orange. */
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palSetPadMode(GPIOD, GPIOD_LED5, PAL_MODE_ALTERNATE(2)); /* Red. */
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palSetPadMode(GPIOD, GPIOD_LED6, PAL_MODE_ALTERNATE(2)); /* Blue. */
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/*
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* Creates the example thread.
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*/
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chThdCreateStatic(waThread1, sizeof(waThread1),
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NORMALPRIO + 10, Thread1, NULL);
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/*
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* Normal main() thread activity, in this demo it does nothing except
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* sleeping in a loop and check the button state, when the button is
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* pressed the test procedure is launched with output on the serial
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* driver 2.
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*/
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while (TRUE) {
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if (palReadPad(GPIOA, GPIOA_BUTTON))
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TestThread(&SD2);
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chThdSleepMilliseconds(500);
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}
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}
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