NUCLEO-L432KC: Added sinusoidal DAC wave generator example

boards/arm/stm32l4/nucleo-l432kc/Kconfig

@@ -141,4 +141,21 @@ config NUCLEOL432KC_SPWM_PHASE_NUM
 
 endif
 
+menuconfig NUCLEOL432KC_DAC_WGEN
+	depends on (STM32L4_DAC_LL_OPS) && (STM32L4_DAC1_DMA) && (STM32L4_TIM2_DAC)
+	bool "Sinusoidal DAC wave generator example"
+	default n
+
+if NUCLEOL432KC_DAC_WGEN
+
+config NUCLEOL432KC_DAC_WGEN_SAMPLES
+	int "Sine samples"
+	default 40
+
+config NUCLEOL432KC_SPWM_FREQ
+	int "Waveform frequency in Hz"
+	default 50
+
+endif
+
 endif # ARCH_BOARD_NUCLEO_L432KC

boards/arm/stm32l4/nucleo-l432kc/configs/wgen/defconfig

@@ -0,0 +1,72 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_FPU is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_CMDPARMS is not set
+# CONFIG_NSH_DISABLE_IFCONFIG is not set
+# CONFIG_NSH_DISABLE_PS is not set
+CONFIG_ANALOG=y
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="nucleo-l432kc"
+CONFIG_ARCH_BOARD_NUCLEO_L432KC=y
+CONFIG_ARCH_CHIP="stm32l4"
+CONFIG_ARCH_CHIP_STM32L432KC=y
+CONFIG_ARCH_CHIP_STM32L4=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=8499
+CONFIG_BUILTIN=y
+CONFIG_DAC=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_EXAMPLES_ALARM=y
+CONFIG_EXAMPLES_RANDOM=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_INIT_ENTRYPOINT="dac_wgen_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_MM_REGIONS=2
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_NUCLEOL432KC_DAC_WGEN=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=65536
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_RTC_ALARM=y
+CONFIG_RTC_DATETIME=y
+CONFIG_RTC_DRIVER=y
+CONFIG_RTC_IOCTL=y
+CONFIG_RTC_NALARMS=2
+CONFIG_SCHED_WAITPID=y
+CONFIG_SPI=y
+CONFIG_STM32L4_DAC1=y
+CONFIG_STM32L4_DAC1_DMA=y
+CONFIG_STM32L4_DAC1_DMA_BUFFER_SIZE=40
+CONFIG_STM32L4_DAC1_TIMER=2
+CONFIG_STM32L4_DAC1_TIMER_FREQUENCY=2000
+CONFIG_STM32L4_DAC_LL_OPS=y
+CONFIG_STM32L4_DISABLE_IDLE_SLEEP_DURING_DEBUG=y
+CONFIG_STM32L4_DMA1=y
+CONFIG_STM32L4_DMA2=y
+CONFIG_STM32L4_PWR=y
+CONFIG_STM32L4_RNG=y
+CONFIG_STM32L4_RTC=y
+CONFIG_STM32L4_SAI1PLL=y
+CONFIG_STM32L4_SRAM2_HEAP=y
+CONFIG_STM32L4_TIM2=y
+CONFIG_STM32L4_TIM2_DAC=y
+CONFIG_STM32L4_USART2=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_TESTING_OSTEST=y
+CONFIG_USART2_SERIAL_CONSOLE=y

boards/arm/stm32l4/nucleo-l432kc/include/board.h

@@ -61,6 +61,14 @@
 
 #define ADC1_DMA_CHAN DMACHAN_ADC1_1
 
+/* Analog pin selections ****************************************************/
+
+/* DAC
+ * Default is PA4 (same as ADC, do not use both at the same time)
+ */
+
+#define GPIO_DAC1_OUT            GPIO_DAC1_OUT_1
+
 /* Alternate function pin selections ****************************************/
 
 /* USART1:

boards/arm/stm32l4/nucleo-l432kc/src/Makefile

@@ -80,4 +80,8 @@ ifeq ($(CONFIG_NUCLEOL432KC_SPWM),y)
 CSRCS += stm32_spwm.c
 endif
 
+ifeq ($(CONFIG_NUCLEOL432KC_DAC_WGEN),y)
+CSRCS += stm32_dac_wgen.c
+endif
+
 include $(TOPDIR)/boards/Board.mk

boards/arm/stm32l4/nucleo-l432kc/src/stm32_dac_wgen.c

@@ -0,0 +1,285 @@
+/****************************************************************************
+ * boards/arm/stm32l4/nucleo-l432kc/src/stm32_dac_wgen.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+#include <errno.h>
+#include <math.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <syslog.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+#include <nuttx/signal.h>
+#include <arch/board/board.h>
+
+#include "stm32l4_dac.h"
+
+#include "nucleo-l432kc.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Configuration ************************************************************/
+
+#ifndef CONFIG_NUCLEOL432KC_DAC_WGEN_SAMPLES
+#  define CONFIG_NUCLEOL432KC_DAC_WGEN_SAMPLES 40
+#endif
+
+#ifndef CONFIG_NUCLEOL432KC_DAC_WGEN_FREQ
+#  define CONFIG_NUCLEOL432KC_DAC_WGEN_FREQ 50
+#endif
+
+/* Assertions ***************************************************************/
+
+#ifndef CONFIG_ARCH_CHIP_STM32L432KC
+#  warning "This only have been verified with CONFIG_ARCH_CHIP_STM32L432KC"
+#endif
+
+#ifndef CONFIG_DAC
+#  error "CONFIG_DAC is required"
+#endif
+
+#ifndef CONFIG_STM32L4_DAC1
+#  error "CONFIG_STM32L4_DAC1 is required"
+#endif
+
+#ifndef CONFIG_STM32L4_DAC_LL_OPS
+#  error "CONFIG_STM32L4_DAC_LL_OPS is required"
+#endif
+
+#ifndef CONFIG_STM32L4_DAC1_DMA
+#  error "CONFIG_STM32L4_DAC1_DMA is required"
+#endif
+
+#if (CONFIG_STM32L4_DAC1_DMA_BUFFER_SIZE < CONFIG_NUCLEOL432KC_DAC_WGEN_SAMPLES)
+#  error "DMA buffer size should be equal or greater than the number of samples."
+#endif
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/* DAC wave generator private data */
+
+struct dac_wgen_s
+{
+  struct stm32_dac_dev_s *dac;
+  uint16_t               *dac_dmabuffer;
+  uint16_t               samples;        /* Waveform samples num */
+  float                  phase_step;     /* Waveform phase step */
+  float                  waveform_freq;  /* Waveform frequency */
+};
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static struct dac_wgen_s g_dac_wgen =
+{
+  .dac           = NULL,
+  .dac_dmabuffer = stm32l4_dac1_dmabuffer,
+  .samples       = CONFIG_NUCLEOL432KC_DAC_WGEN_SAMPLES,
+  .waveform_freq = ((float)CONFIG_NUCLEOL432KC_DAC_WGEN_FREQ)
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static float waveform_func(float x);
+static void waveform_init(struct dac_wgen_s *dac_wgen, float (*f)(float));
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: waveform_func
+ *
+ * Description:
+ *   Modulation function. This function must return values from <0.0, 1.0>!
+ *
+ ****************************************************************************/
+
+static float waveform_func(float x)
+{
+  DEBUGASSERT(x >= 0 && x <= 2 * M_PI);
+
+  /* Sine modulation */
+
+  return (sinf(x) + 1.0f) / 2.0f;
+}
+
+/****************************************************************************
+ * Name: waveform_init
+ *
+ * Description:
+ *   Initialize waveform
+ *
+ ****************************************************************************/
+
+static void waveform_init(struct dac_wgen_s *dac_wgen, float (*f)(float))
+{
+  int i;
+  float value;
+
+  /* Get phase step to achieve one sine waveform period */
+
+  dac_wgen->phase_step = (float)(2 * M_PI / dac_wgen->samples);
+
+  /* Initialize sine table */
+
+  for (i = 0; i < dac_wgen->samples; i += 1)
+    {
+      /* We need sine in range from 0 to 1.0 */
+
+      value = (sinf(dac_wgen->phase_step * i) + 1.0f) / 2.0f;
+      dac_wgen->dac_dmabuffer[i] = (uint16_t)(value * 4095);
+    }
+}
+
+/****************************************************************************
+ * Name: dac_wgen_start
+ ****************************************************************************/
+
+static int dac_wgen_start(struct dac_wgen_s *dac_wgen)
+{
+  DAC_ENABLE(dac_wgen->dac, true);
+  DAC_START_DMA(dac_wgen->dac);
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: dac_wgen_stop
+ ****************************************************************************/
+
+static int dac_wgen_stop(struct dac_wgen_s *dac_wgen)
+{
+  DAC_STOP_DMA(dac_wgen->dac);
+  DAC_ENABLE(dac_wgen->dac, false);
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: dac_wgen_setup
+ ****************************************************************************/
+
+int dac_wgen_setup(struct dac_wgen_s *dac_wgen)
+{
+  struct dac_dev_s *dac;
+
+  int ret = OK;
+
+  dac = stm32l4_dacinitialize(0);
+  if (dac == NULL)
+    {
+      syslog(LOG_ERR, "Failed to get DAC interface\n");
+      ret = ERROR;
+      goto errout;
+    }
+
+  dac_wgen->dac = (struct stm32_dac_dev_s *)dac->ad_priv;
+
+errout:
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dac_wgen_main
+ *
+ * Description:
+ *   Entrypoint for DAC waveform generator example.
+ *
+ ****************************************************************************/
+
+int dac_wgen_main(int argc, char *argv[])
+{
+  struct dac_wgen_s *dac_wgen = NULL;
+
+  int i = 0;
+  int ret = OK;
+
+  dac_wgen = &g_dac_wgen;
+
+  syslog(LOG_INFO, "\ndac_wgen_main: Started\n");
+
+  /* Setup DAC wave generator */
+
+  ret = dac_wgen_setup(dac_wgen);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed to setup DAC WGEN %d!\n", ret);
+      goto errout;
+    }
+
+  /* Initialize modulation waveform */
+
+  waveform_init(dac_wgen, waveform_func);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed initialize waveform %d!\n", ret);
+      goto errout;
+    }
+
+  /* Start DAC wave generator */
+
+  ret = dac_wgen_start(dac_wgen);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed start DAC WGEN %d!\n", ret);
+      goto errout;
+    }
+
+  /* Main loop */
+
+  while (1)
+    {
+      /* Print counter */
+
+      syslog(LOG_INFO, "%d\n", i);
+
+      /* Increase counter */
+
+      i += 1;
+
+      /* Sleep */
+
+      nxsig_sleep(1);
+    }
+
+errout:
+  dac_wgen_stop(dac_wgen);
+
+  return OK;
+}