From a8e9a985d50829cdffb6c20177eea0f206311f62 Mon Sep 17 00:00:00 2001
From: Ichiro Kuroki <ichiro.kuroki@gmail.com>
Date: Sat, 10 Apr 2021 13:38:44 +0300
Subject: [PATCH] boards/arduino-nano-33-iot: add PWM configuration

---
 boards/arduino-nano-33-iot/Kconfig            |  1 +
 boards/arduino-nano-33-iot/Makefile.features  |  1 +
 .../arduino-nano-33-iot/include/periph_conf.h | 40 +++++++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/boards/arduino-nano-33-iot/Kconfig b/boards/arduino-nano-33-iot/Kconfig
index a48a492cc9..b740f92b24 100644
--- a/boards/arduino-nano-33-iot/Kconfig
+++ b/boards/arduino-nano-33-iot/Kconfig
@@ -12,6 +12,7 @@ config BOARD_ARDUINO_NANO_33_IOT
     default y
     select CPU_MODEL_SAMD21G18A
     select HAS_PERIPH_I2C
+    select HAS_PERIPH_PWM
     select HAS_PERIPH_RTC
     select HAS_PERIPH_RTT
     select HAS_PERIPH_SPI
diff --git a/boards/arduino-nano-33-iot/Makefile.features b/boards/arduino-nano-33-iot/Makefile.features
index 6aae77d530..1912e23964 100644
--- a/boards/arduino-nano-33-iot/Makefile.features
+++ b/boards/arduino-nano-33-iot/Makefile.features
@@ -3,6 +3,7 @@ CPU_MODEL = samd21g18a
 
 # Put defined MCU peripherals here (in alphabetical order)
 FEATURES_PROVIDED += periph_i2c
+FEATURES_PROVIDED += periph_pwm
 FEATURES_PROVIDED += periph_rtc
 FEATURES_PROVIDED += periph_rtt
 FEATURES_PROVIDED += periph_spi
diff --git a/boards/arduino-nano-33-iot/include/periph_conf.h b/boards/arduino-nano-33-iot/include/periph_conf.h
index e05d2df77a..a09184d08a 100644
--- a/boards/arduino-nano-33-iot/include/periph_conf.h
+++ b/boards/arduino-nano-33-iot/include/periph_conf.h
@@ -139,6 +139,46 @@ static const uart_conf_t uart_config[] = {
 #define UART_NUMOF          ARRAY_SIZE(uart_config)
 /** @} */
 
+
+/**
+ * @name PWM configuration
+ * @{
+ */
+#define PWM_0_EN            1
+#define PWM_1_EN            1
+
+#if PWM_0_EN
+/* PWM0 channels */
+static const pwm_conf_chan_t pwm_chan0_config[] = {
+    /* GPIO pin, MUX value, TCC channel */
+    { GPIO_PIN(PA, 4), GPIO_MUX_E, 0},
+    { GPIO_PIN(PA, 5), GPIO_MUX_E, 1},
+};
+#endif
+#if PWM_1_EN
+/* PWM1 channels */
+static const pwm_conf_chan_t pwm_chan1_config[] = {
+    /* GPIO pin, MUX value, TCC channel */
+    { GPIO_PIN(PA, 10), GPIO_MUX_E,  0 },
+    { GPIO_PIN(PA, 11), GPIO_MUX_E,  1 },
+};
+#endif
+
+/* PWM device configuration */
+static const pwm_conf_t pwm_config[] = {
+#if PWM_0_EN
+    {TCC_CONFIG(TCC0), pwm_chan0_config, ARRAY_SIZE(pwm_chan0_config), SAM0_GCLK_MAIN},
+#endif
+
+#if PWM_1_EN
+    {TCC_CONFIG(TCC1), pwm_chan1_config, ARRAY_SIZE(pwm_chan1_config), SAM0_GCLK_MAIN},
+#endif
+};
+
+/* number of devices that are actually defined */
+#define PWM_NUMOF           ARRAY_SIZE(pwm_config)
+/** @} */
+
 /**
  * @name I2C configuration
  * @{