samples: mgmt/osdp: Add CP Sample

Add a OSDP CP mode sample that sends out a periocic command to a
connected PD. It also demosnstrates key press and card read callback
registration.

Signed-off-by: Siddharth Chandrasekaran <siddharth@embedjournal.com>

samples/subsys/mgmt/osdp/CMakeLists.txt

@@ -10,3 +10,4 @@ include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
 project(osdp_sample)
 
 target_sources_ifdef(CONFIG_OSDP_MODE_PD app PRIVATE src/pd_main.c)
+target_sources_ifdef(CONFIG_OSDP_MODE_CP app PRIVATE src/cp_main.c)

samples/subsys/mgmt/osdp/src/cp_main.c

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2020 Siddharth Chandrasekaran <siddharth@embedjournal.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <device.h>
+#include <drivers/gpio.h>
+#include <mgmt/osdp.h>
+
+/* The devicetree node identifier for the "led0" alias. */
+#define LED0_NODE DT_ALIAS(led0)
+
+#if DT_NODE_HAS_STATUS(LED0_NODE, okay)
+#define LED0    DT_GPIO_LABEL(LED0_NODE, gpios)
+#define PIN     DT_GPIO_PIN(LED0_NODE, gpios)
+#if DT_PHA_HAS_CELL(LED0_NODE, gpios, flags)
+#define FLAGS   DT_GPIO_FLAGS(LED0_NODE, gpios)
+#endif
+#else
+#error "BOARD does not define a debug LED"
+#define LED0    ""
+#define PIN     0
+#endif
+
+#ifndef FLAGS
+#define FLAGS   0
+#endif
+
+#define SLEEP_TIME_MS                  (5)
+#define CNT_PER_SEC                    (1000 / SLEEP_TIME_MS)
+#define COMMAND_WAIT_TIME_SEC          (10)
+#define COMMAND_WAIT_COUNT             (COMMAND_WAIT_TIME_SEC * CNT_PER_SEC)
+
+enum osdp_pd_e {
+	OSDP_PD_0,
+	OSDP_PD_SENTINEL,
+};
+
+int key_press_callback(int pd, uint8_t key)
+{
+	printk("CP PD[%d] key press - data: 0x%02x\n", pd, key);
+	return 0;
+}
+
+int card_read_callback(int pd, int format, uint8_t *data, int len)
+{
+	int i;
+
+	printk("CP PD[%d] card read - fmt: %d len: %d card_data: [ ",
+	       pd, format, len);
+
+	for (i = 0; i < len; i++) {
+		printk("0x%02x ", data[i]);
+	}
+
+	printk("]\n");
+	return 0;
+}
+
+void main(void)
+{
+	int ret, led_state;
+	uint32_t cnt = 0;
+	const struct device *dev;
+	struct osdp_cmd_output pulse_output = {
+		.output_no = 0,     /* First output */
+		.control_code = 5,  /* Temporarily turn on output */
+		.tmr_count = 10,    /* Timer: 10 * 100ms = 1 second */
+	};
+
+	dev = device_get_binding(LED0);
+	if (dev == NULL) {
+		printk("Failed to get LED0 binding\n");
+		return;
+	}
+
+	ret = gpio_pin_configure(dev, PIN, GPIO_OUTPUT_ACTIVE | FLAGS);
+	if (ret < 0) {
+		printk("Failed to configure gpio pin\n");
+		return;
+	}
+
+	osdp_cp_set_callback_key_press(key_press_callback);
+	osdp_cp_set_callback_card_read(card_read_callback);
+
+	led_state = 0;
+	while (1) {
+		if ((cnt & 0x7f) == 0x7f) {
+			/* show a sign of life */
+			led_state = !led_state;
+		}
+		if ((cnt % COMMAND_WAIT_COUNT) == 0) {
+			osdp_cp_send_cmd_output(OSDP_PD_0, &pulse_output);
+		}
+		gpio_pin_set(dev, PIN, led_state);
+		k_msleep(SLEEP_TIME_MS);
+		cnt++;
+	}
+}

subsys/mgmt/osdp/src/osdp_cp.c

@@ -390,7 +390,8 @@ static int cp_decode_response(struct osdp_pd *pd, uint8_t *buf, int len)
 		if (len != REPLY_BUSY_DATA_LEN) {
 			break;
 		}
-		return OSDP_CP_ERR_RETRY_CMD;
+		ret = OSDP_CP_ERR_RETRY_CMD;
+		break;
 	default:
 		LOG_DBG(TAG "unexpected reply: 0x%02x", pd->reply_id);
 		return OSDP_CP_ERR_GENERIC;