Implement at6561 can trx driver

drivers/at6561/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base

drivers/at6561/Makefile.dep

@@ -0,0 +1,2 @@
+USEMODULE += can_trx
+FEATURES_REQUIRED += periph_gpio

drivers/at6561/at6561.c

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2024 ML!PA Consulting GmbH
+ *
+ * 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         drivers_at6561
+ *
+ * @{
+ * @file
+ * @brief           Driver for AT6561 CAN transceiver
+ *
+ * @author          Firas Hamdi <[email protected]>
+ *
+ * @}
+ */
+
+#include "can/can_trx.h"
+#include "at6561.h"
+#include "periph/gpio.h"
+#include "assert.h"
+#include "container.h"
+
+static int _init(can_trx_t *can_trx);
+static int _set_mode(can_trx_t *can_trx, can_trx_mode_t mode);
+
+const trx_driver_t at6561_driver = {
+    .init = _init,
+    .set_mode = _set_mode,
+};
+
+static int _init(can_trx_t *can_trx)
+{
+    at6561_trx_t *dev = container_of(can_trx, at6561_trx_t, trx);
+
+    gpio_init(dev->stby_pin, GPIO_OUT);
+    /* A high level on the standby pin of the CAN transceiver will
+        select the standby mode. Check AT6560/1 datasheet, table 1-1 */
+    gpio_set(dev->stby_pin);
+
+    return 1;
+}
+
+/* Set the mode of the CAN transceiver */
+static int _set_mode(can_trx_t *can_trx, can_trx_mode_t mode)
+{
+    at6561_trx_t *dev = container_of(can_trx, at6561_trx_t, trx);
+
+    /* Check AT6560/1 datasheet, table 1-1 */
+    switch (mode) {
+        case TRX_NORMAL_MODE:
+            gpio_clear(dev->stby_pin);
+            break;
+        case TRX_SLEEP_MODE:
+            gpio_set(dev->stby_pin);
+            break;
+        default:
+            assert(0);
+    }
+
+    return 1;
+}

drivers/include/at6561.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2024 ML!PA Consulting GmbH
+ *
+ * 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.
+ */
+
+/**
+ * @defgroup        drivers_at6561 AT6561 CAN transceiver driver
+ * @ingroup         drivers_can
+ * @ingroup         drivers_can_trx
+ *
+ * @brief           Driver for AT6561 CAN transceiver
+ * @{
+ *
+ * @file
+ *
+ * @author          Firas Hamdi <[email protected]>
+ */
+
+#ifndef AT6561_H
+#define AT6561_H
+
+#include "periph/gpio.h"
+#include "can/can_trx.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief AT6561 CAN transceiver descriptor
+ */
+typedef struct at6561_trx {
+    gpio_t stby_pin;            /**< AT6561 standby pin */
+    can_trx_t trx;              /**< AT6561 interface */
+} at6561_trx_t;
+
+/**
+ * @brief AT6561 driver
+ */
+extern const trx_driver_t at6561_driver;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AT6561_H */
+/** @} */

tests/sys/can_trx/Makefile

@@ -24,4 +24,11 @@ ifneq (,$(filter ncv7356,$(TRX_TO_BUILD)))
 	CFLAGS += -DNCV7356_MODE1_PIN=$(NCV7356_MODE1_PIN)
 endif
 
+ifneq (, $(filter at6561, $(TRX_TO_BUILD)))
+	USEMODULE += at6561
+	AT6561_STBY_PIN ?= GPIO_PIN\(0,0\)
+
+	CFLAGS += -DAT6561_STBY_PIN=$(AT6561_STBY_PIN)
+endif
+
 include $(RIOTBASE)/Makefile.include

tests/sys/can_trx/main.c

@@ -40,12 +40,22 @@ ncv7356_trx_t ncv7356 ={ .trx.driver = &ncv7356_driver,
 };
 #endif
 
+#ifdef MODULE_AT6561
+#include "at6561.h"
+at6561_trx_t at6561 = { .stby_pin = AT6561_STBY_PIN,
+                        .trx.driver = &at6561_driver
+};
+#endif
+
 static can_trx_t *devs[] = {
 #ifdef MODULE_TJA1042
     (can_trx_t *)&tja1042,
 #endif
 #ifdef MODULE_NCV7356
     (can_trx_t *)&ncv7356,
+#endif
+#ifdef MODULE_AT6561
+    &at6561.trx,
 #endif
     NULL,
 };