diff options
Diffstat (limited to 'demos/ARMCM3-STM32F100-DISCOVERY/main.c')
| -rw-r--r-- | demos/ARMCM3-STM32F100-DISCOVERY/main.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/demos/ARMCM3-STM32F100-DISCOVERY/main.c b/demos/ARMCM3-STM32F100-DISCOVERY/main.c new file mode 100644 index 000000000..471929a4d --- /dev/null +++ b/demos/ARMCM3-STM32F100-DISCOVERY/main.c @@ -0,0 +1,232 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "ch.h"
+#include "hal.h"
+#include "test.h"
+
+static void pwmpcb(PWMDriver *pwmp);
+static void adccb(ADCDriver *adcp, adcsample_t *buffer, size_t n);
+static void spicb(SPIDriver *spip);
+
+/* Total number of channels to be sampled by a single ADC operation.*/
+#define ADC_GRP1_NUM_CHANNELS 2
+
+/* Depth of the conversion buffer, channels are sampled four times each.*/
+#define ADC_GRP1_BUF_DEPTH 4
+
+/*
+ * ADC samples buffer.
+ */
+static adcsample_t samples[ADC_GRP1_NUM_CHANNELS * ADC_GRP1_BUF_DEPTH];
+
+/*
+ * ADC conversion group.
+ * Mode: Linear buffer, 4 samples of 2 channels, SW triggered.
+ * Channels: IN10 (41.5 cycles sample time)
+ * Sensor (239.5 cycles sample time)
+ */
+static const ADCConversionGroup adcgrpcfg = {
+ FALSE,
+ ADC_GRP1_NUM_CHANNELS,
+ adccb,
+ /* HW dependent part.*/
+ 0,
+ ADC_CR2_TSVREFE,
+ ADC_SMPR1_SMP_AN10(ADC_SAMPLE_41P5) | ADC_SMPR1_SMP_SENSOR(ADC_SAMPLE_239P5),
+ 0,
+ ADC_SQR1_NUM_CH(ADC_GRP1_NUM_CHANNELS),
+ 0,
+ ADC_SQR3_SQ1_N(ADC_CHANNEL_IN10) | ADC_SQR3_SQ0_N(ADC_CHANNEL_SENSOR)
+};
+
+/*
+ * PWM configuration structure.
+ * Cyclic callback enabled, channels 3 and 4 enabled without callbacks,
+ * the active state is a logic one.
+ */
+static PWMConfig pwmcfg = {
+ pwmpcb,
+ {
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_ACTIVE_HIGH, NULL},
+ {PWM_OUTPUT_ACTIVE_HIGH, NULL}
+ },
+ /* HW dependent part.*/
+ PWM_COMPUTE_PSC(STM32_TIMCLK1, 10000), /* 10KHz PWM clock frequency. */
+ PWM_COMPUTE_ARR(10000, 1000000000), /* PWM period 1S (in nS). */
+ 0
+};
+
+/*
+ * SPI configuration structure.
+ * Maximum speed (12MHz), CPHA=0, CPOL=0, 16bits frames, MSb transmitted first.
+ * The slave select line is the pin GPIOA_SPI1NSS on the port GPIOA.
+ */
+static const SPIConfig spicfg = {
+ spicb,
+ /* HW dependent part.*/
+ GPIOA,
+ GPIOA_SPI1NSS,
+ SPI_CR1_DFF
+};
+
+/*
+ * PWM cyclic callback.
+ * A new ADC conversion is started.
+ */
+static void pwmpcb(PWMDriver *pwmp) {
+
+ (void)pwmp;
+
+ /* Starts an asynchronous ADC conversion operation, the conversion
+ will be executed in parallel to the current PWM cycle and will
+ terminate before the next PWM cycle.*/
+ chSysLockFromIsr();
+ adcStartConversionI(&ADCD1, &adcgrpcfg, samples, ADC_GRP1_BUF_DEPTH);
+ chSysUnlockFromIsr();
+}
+
+/*
+ * ADC end conversion callback.
+ * The PWM channels are reprogrammed using the latest ADC samples.
+ * The latest samples are transmitted into a single SPI transaction.
+ */
+void adccb(ADCDriver *adcp, adcsample_t *buffer, size_t n) {
+
+ (void) buffer; (void) n;
+ /* Note, only in the ADC_COMPLETE state because the ADC driver fires an
+ intermediate callback when the buffer is half full.*/
+ if (adcp->ad_state == ADC_COMPLETE) {
+ adcsample_t avg_ch1, avg_ch2;
+
+ /* Calculates the average values from the ADC samples.*/
+ avg_ch1 = (samples[0] + samples[2] + samples[4] + samples[6]) / 4;
+ avg_ch2 = (samples[1] + samples[3] + samples[5] + samples[7]) / 4;
+
+ chSysLockFromIsr();
+
+ /* Changes the channels pulse width, the change will be effective
+ starting from the next cycle.*/
+ pwmEnableChannelI(&PWMD3, 2, PWM_FRACTION_TO_WIDTH(&PWMD3, 4096, avg_ch1));
+ pwmEnableChannelI(&PWMD3, 3, PWM_FRACTION_TO_WIDTH(&PWMD3, 4096, avg_ch2));
+
+ /* SPI slave selection and transmission start.*/
+ spiSelectI(&SPID1);
+ spiStartSendI(&SPID1, ADC_GRP1_NUM_CHANNELS * ADC_GRP1_BUF_DEPTH, samples);
+
+ chSysUnlockFromIsr();
+ }
+}
+
+/*
+ * SPI end transfer callback.
+ */
+static void spicb(SPIDriver *spip) {
+
+ /* On transfer end just releases the slave select line.*/
+ chSysLockFromIsr();
+ spiUnselectI(spip);
+ chSysUnlockFromIsr();
+}
+
+/*
+ * This is a periodic thread that does absolutely nothing except increasing
+ * a seconds counter.
+ */
+static WORKING_AREA(waThread1, 128);
+static msg_t Thread1(void *arg) {
+ static uint32_t seconds_counter;
+
+ (void)arg;
+ while (TRUE) {
+ chThdSleepMilliseconds(1000);
+ seconds_counter++;
+ }
+}
+
+/*
+ * Application entry point.
+ */
+int main(void) {
+
+ /*
+ * 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();
+
+ /*
+ * Activates the serial driver 1 using the driver default configuration.
+ */
+ sdStart(&SD1, NULL);
+
+ /*
+ * If the user button is pressed after the reset then the test suite is
+ * executed immediately before activating the various device drivers in
+ * order to not alter the benchmark scores.
+ */
+ if (palReadPad(GPIOA, GPIOA_BUTTON))
+ TestThread(&SD1);
+
+ /*
+ * Initializes the SPI driver 1.
+ */
+ spiStart(&SPID1, &spicfg);
+
+ /*
+ * Initializes the ADC driver 1.
+ * The pin PC0 on the port GPIOC is programmed as analog input.
+ */
+ adcStart(&ADCD1, NULL);
+ palSetGroupMode(GPIOC, PAL_PORT_BIT(0), PAL_MODE_INPUT_ANALOG);
+
+ /*
+ * Initializes the PWM driver 1, re-routes the TIM3 outputs, programs the
+ * pins as alternate functions.
+ * Note, the AFIO access routes the TIM3 output pins on the PC6...PC9
+ * where the LEDs are connected.
+ */
+ pwmStart(&PWMD3, &pwmcfg);
+ AFIO->MAPR |= AFIO_MAPR_TIM3_REMAP_0 | AFIO_MAPR_TIM3_REMAP_1;
+ palSetGroupMode(GPIOC, PAL_PORT_BIT(GPIOC_LED3) | PAL_PORT_BIT(GPIOC_LED4),
+ PAL_MODE_STM32_ALTERNATE_PUSHPULL);
+
+ /*
+ * Creates the example thread.
+ */
+ chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
+
+ /*
+ * Normal main() thread activity, in this demo it does nothing except
+ * sleeping in a loop and check the button state, when the button is
+ * pressed the test procedure is launched with output on the serial
+ * driver 1.
+ */
+ while (TRUE) {
+ if (palReadPad(GPIOA, GPIOA_BUTTON))
+ TestThread(&SD1);
+ chThdSleepMilliseconds(500);
+ }
+}
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