Merge pull request #20106 from maribu/boards/nrf51dk

boards/nrf51dk: add ADC and Arduino features

boards/nrf51dk/Kconfig

@@ -12,6 +12,13 @@ config BOARD_NRF51DK
     default y
     select BOARD_COMMON_NRF51
     select CPU_MODEL_NRF51X22XXAC
+    select HAS_ARDUINO_ANALOG
+    select HAS_ARDUINO_I2C
+    select HAS_ARDUINO_PINS
+    select HAS_ARDUINO_SHIELD_ISP
+    select HAS_ARDUINO_SHIELD_UNO
+    select HAS_ARDUINO_SPI
+    select HAS_PERIPH_ADC
     select HAS_PERIPH_I2C
     select HAS_PERIPH_SPI
     select HAS_PERIPH_UART

boards/nrf51dk/Makefile.features

@@ -1,11 +1,18 @@
 CPU_MODEL = nrf51x22xxac
 
 # Put defined MCU peripherals here (in alphabetical order)
+FEATURES_PROVIDED += periph_adc
 FEATURES_PROVIDED += periph_i2c
 FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_uart
 FEATURES_PROVIDED += periph_uart_hw_fc
 FEATURES_PROVIDED += vdd_lc_filter_reg1
+FEATURES_PROVIDED += arduino_analog
+FEATURES_PROVIDED += arduino_i2c
+FEATURES_PROVIDED += arduino_pins
+FEATURES_PROVIDED += arduino_shield_isp
+FEATURES_PROVIDED += arduino_shield_uno
+FEATURES_PROVIDED += arduino_spi
 
 # include common nrf51 based boards features
 include $(RIOTBOARD)/common/nrf51/Makefile.features

boards/nrf51dk/include/arduino_iomap.h

@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2023 Otto-von-Guericke-Universität Magdeburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_nrf51dk
+ * @{
+ *
+ * @file
+ * @brief       Mapping from MCU pins to Arduino pins
+ *
+ * You can use the defines in this file for simplified interaction with the
+ * Arduino specific pin numbers.
+ *
+ * @author      Marian Buschsieweke <marian.buschsieweke@ovgu.de>
+ */
+
+#ifndef ARDUINO_IOMAP_H
+#define ARDUINO_IOMAP_H
+
+#include "periph/gpio.h"
+#include "periph/adc.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name    Arduino's SPI buses
+ * @{
+ */
+/**
+ * @brief   SPI_DEV(0) is connected to D11/D12/D13
+ */
+/* D11/D12/D13 are on P0.25, P0.28, P0.29 */
+#define ARDUINO_SPI_D11D12D13   SPI_DEV(0)
+/* The ISP SPI bus is also connected to P0.25, P0.28, P0.29 */
+#define ARDUINO_SPI_ISP         SPI_DEV(0)
+/** @} */
+
+/**
+ * @name    Arduino's I2C buses
+ * @{
+ */
+/**
+ * @brief   The first I2C bus is where shields for the Arduino UNO/Mega expect
+ *          it
+ */
+#define ARDUINO_I2C_UNO         I2C_DEV(0)
+/** @} */
+
+/**
+ * @name   Mapping of MCU pins to Arduino pins
+ * @{
+ */
+/* P3 header on the nRF51DK */
+#define ARDUINO_PIN_0           GPIO_PIN(0, 12)
+#define ARDUINO_PIN_1           GPIO_PIN(0, 13)
+#define ARDUINO_PIN_2           GPIO_PIN(0, 14)
+#define ARDUINO_PIN_3           GPIO_PIN(0, 15)
+#define ARDUINO_PIN_4           GPIO_PIN(0, 16)
+#define ARDUINO_PIN_5           GPIO_PIN(0, 17)
+#define ARDUINO_PIN_6           GPIO_PIN(0, 18)
+#define ARDUINO_PIN_7           GPIO_PIN(0, 19)
+
+/* P4 header on the nRF51DK */
+#define ARDUINO_PIN_8           GPIO_PIN(0, 20)
+#define ARDUINO_PIN_9           GPIO_PIN(0, 23)
+#define ARDUINO_PIN_10          GPIO_PIN(0, 24)
+#define ARDUINO_PIN_11          GPIO_PIN(0, 25)
+#define ARDUINO_PIN_12          GPIO_PIN(0, 28)
+#define ARDUINO_PIN_13          GPIO_PIN(0, 29)
+/* SCL and SDA on this header are not available as digital pins in the
+ * Arduino world. It is P0.30 and P0.07 here, though. Also what would be
+ * AREF in the Arduino world is P0.00 here */
+
+/* P2 header on the nRF51DK */
+#define ARDUINO_PIN_14          GPIO_PIN(0, 1)
+#define ARDUINO_PIN_15          GPIO_PIN(0, 2)
+#define ARDUINO_PIN_16          GPIO_PIN(0, 3)
+#define ARDUINO_PIN_17          GPIO_PIN(0, 4)
+#define ARDUINO_PIN_18          GPIO_PIN(0, 5)
+#define ARDUINO_PIN_19          GPIO_PIN(0, 6)
+
+#define ARDUINO_PIN_LAST        19
+/** @} */
+
+/**
+ * @name    Aliases for analog pins
+ * @{
+ */
+#define ARDUINO_PIN_A0          ARDUINO_PIN_14
+#define ARDUINO_PIN_A1          ARDUINO_PIN_15
+#define ARDUINO_PIN_A2          ARDUINO_PIN_16
+#define ARDUINO_PIN_A3          ARDUINO_PIN_17
+#define ARDUINO_PIN_A4          ARDUINO_PIN_18
+#define ARDUINO_PIN_A5          ARDUINO_PIN_19
+/** @} */
+
+/**
+ * @name    Mapping of Arduino analog pins to RIOT ADC lines
+ * @{
+ */
+#define ARDUINO_A0              ADC_LINE(0)
+#define ARDUINO_A1              ADC_LINE(1)
+#define ARDUINO_A2              ADC_LINE(2)
+#define ARDUINO_A3              ADC_LINE(3)
+#define ARDUINO_A4              ADC_LINE(4)
+#define ARDUINO_A5              ADC_LINE(5)
+
+#define ARDUINO_ANALOG_PIN_LAST 5
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ARDUINO_IOMAP_H */
+/** @} */

boards/nrf51dk/include/periph_conf.h

@@ -73,6 +73,30 @@ static const i2c_conf_t i2c_config[] = {
 #define I2C_NUMOF           ARRAY_SIZE(i2c_config)
 /** @} */
 
+/**
+ * @name    ADC configuration
+ *
+ * The ADC channels have a fixed mapping:
+ *
+ * | Channel    | MCU Pin   | Arduino pin on board                  |
+ * |:---------- |:--------- |:------------------------------------- |
+ * | AIN0       | P0.26     | -- (exposed, by no Arduino UNO pin)   |
+ * | AIN1       | P0.27     | -- (exposed, by no Arduino UNO pin)   |
+ * | AIN2       | P0.01     | A0                                    |
+ * | AIN3       | P0.02     | A1                                    |
+ * | AIN4       | P0.03     | A2                                    |
+ * | AIN5       | P0.04     | A3                                    |
+ * | AIN6       | P0.05     | A4                                    |
+ * | AIN7       | P0.06     | A5                                    |
+ *
+ * Expose those on Arduino pins A0 to A5
+ * @{
+ */
+static const adc_conf_t adc_config[] = {2, 3, 4, 5, 6, 7};
+
+#define ADC_NUMOF           ARRAY_SIZE(adc_config)
+/** @} */
+
 #ifdef __cplusplus
 }
 #endif