From 2e554f3ef5e1e3d7b6d04457cee27dd79618e345 Mon Sep 17 00:00:00 2001
From: Stephen Caudle <stephen@caudle.info>
Date: Mon, 31 Aug 2015 23:16:06 -0400
Subject: Add ADC driver for nRF51

---
 testhal/NRF51/NRF51822/ADC/main.c | 139 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 testhal/NRF51/NRF51822/ADC/main.c

(limited to 'testhal/NRF51/NRF51822/ADC/main.c')

diff --git a/testhal/NRF51/NRF51822/ADC/main.c b/testhal/NRF51/NRF51822/ADC/main.c
new file mode 100644
index 0000000..d413c85
--- /dev/null
+++ b/testhal/NRF51/NRF51822/ADC/main.c
@@ -0,0 +1,139 @@
+/*
+    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
+
+    Licensed 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.
+*/
+
+#include "ch.h"
+#include "hal.h"
+
+#define ADC_GRP1_NUM_CHANNELS   1
+#define ADC_GRP1_BUF_DEPTH      8
+
+#define ADC_GRP2_NUM_CHANNELS   1
+#define ADC_GRP2_BUF_DEPTH      16
+
+static adcsample_t samples1[ADC_GRP1_NUM_CHANNELS * ADC_GRP1_BUF_DEPTH];
+static adcsample_t samples2[ADC_GRP2_NUM_CHANNELS * ADC_GRP2_BUF_DEPTH];
+
+/*
+ * ADC streaming callback.
+ */
+size_t nx = 0, ny = 0;
+static void adccallback(ADCDriver *adcp, adcsample_t *buffer, size_t n) {
+
+  (void)adcp;
+  if (samples2 == buffer) {
+    nx += n;
+  }
+  else {
+    ny += n;
+  }
+}
+
+/*
+ * ADC conversion group.
+ * Mode:        Linear buffer, 8 samples of 1 channel, SW triggered.
+ * Channels:    AIN3 (prescaled by 1/3).
+ */
+static const ADCConversionGroup adcgrpcfg1 = {
+  FALSE,
+  ADC_GRP1_NUM_CHANNELS,
+  NULL,
+  (1U << (3)), /* AIN3 */
+  (ADC_CONFIG_RES_8bit << ADC_CONFIG_RES_Pos) |
+    (ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
+    (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
+    (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos)
+};
+
+/*
+ * ADC conversion group.
+ * Mode:        Continuous, 16 samples of 1 channel, SW triggered.
+ * Channels:    VDD (prescaled by 1/3).
+ */
+static const ADCConversionGroup adcgrpcfg2 = {
+  TRUE,
+  ADC_GRP2_NUM_CHANNELS,
+  adccallback,
+  0, /* Use 0 for VDD */
+  (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
+    (ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
+    (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
+    (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos)
+};
+
+/*
+ * LED blinker thread, times are in milliseconds.
+ */
+static THD_WORKING_AREA(waThread1, 128);
+static THD_FUNCTION(Thread1, arg) {
+
+  (void)arg;
+  chRegSetThreadName("blinker");
+  while (true) {
+    palTogglePad(IOPORT1, LED0);
+    chThdSleepMilliseconds(500);
+  }
+}
+
+/*
+ * 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();
+
+  /*
+   * Setting up analog input used by the demo (P0.02, SMBA).
+   */
+  palSetPadMode(IOPORT1, 2, PAL_MODE_INPUT_ANALOG);
+
+  /*
+   * Creates the blinker thread.
+   */
+  chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
+
+  /*
+   * Activates the ADC1 driver and the temperature sensor.
+   */
+  adcStart(&ADCD1, NULL);
+
+  /*
+   * Linear conversion.
+   */
+  adcConvert(&ADCD1, &adcgrpcfg1, samples1, ADC_GRP1_BUF_DEPTH);
+  chThdSleepMilliseconds(1000);
+
+  /*
+   * Starts an ADC continuous conversion.
+   */
+  adcStartConversion(&ADCD1, &adcgrpcfg2, samples2, ADC_GRP2_BUF_DEPTH);
+
+  /*
+   * Normal main() thread activity, in this demo it does nothing.
+   */
+  while (true) {
+    if (palReadPad(IOPORT1, KEY1) == 0)
+      adcStopConversion(&ADCD1);
+    chThdSleepMilliseconds(500);
+  }
+}
-- 
cgit v1.2.3


From 9ad49f5077b1cfbce07715119629e1ddc26bf2d3 Mon Sep 17 00:00:00 2001
From: Stephen Caudle <stephen@caudle.info>
Date: Mon, 14 Sep 2015 11:08:53 -0400
Subject: Add missing braces and fix copyright

---
 testhal/NRF51/NRF51822/ADC/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'testhal/NRF51/NRF51822/ADC/main.c')

diff --git a/testhal/NRF51/NRF51822/ADC/main.c b/testhal/NRF51/NRF51822/ADC/main.c
index d413c85..6371a61 100644
--- a/testhal/NRF51/NRF51822/ADC/main.c
+++ b/testhal/NRF51/NRF51822/ADC/main.c
@@ -1,5 +1,5 @@
 /*
-    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
+    Copyright (C) 2015 Stephen Caudle
 
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
-- 
cgit v1.2.3