use NULL instead of 0 for assigning null pointer

Signed-off-by: Amir Hammad <amir.hammad@hotmail.com>

5 files changed, 18 insertions, 15 deletions

diff --git a/src/demo.c b/src/demo.c
index 995e68c..44a94c0 100644
--- a/src/demo.c
+++ b/src/demo.c
@@ -119,7 +119,7 @@ static const usbh_dev_driver_t *device_drivers[] = {
 	&usbh_hid_driver,

 	&usbh_gp_xbox_driver,

 	&usbh_midi_driver,

-	0

+	NULL

 };

 

 static void gp_xbox_update(uint8_t device_id, gp_xbox_packet_t packet)

@@ -234,7 +234,7 @@ int main(void)
 #ifdef USE_STM32F4_USBH_DRIVER_HS

 		usbh_lld_stm32f4_driver_hs, // Make sure USE_STM32F4_USBH_DRIVER_HS is defined in usbh_config.h

 #endif

-		0

+		NULL

 	};

 	usbh_init(lld_drivers, device_drivers);

 	gpio_clear(GPIOD,  GPIO13);

diff --git a/src/usbh_core.c b/src/usbh_core.c
index fd1dca5..5448d6c 100644
--- a/src/usbh_core.c
+++ b/src/usbh_core.c
@@ -35,7 +35,7 @@ static struct {
 	const usbh_low_level_driver_t * const *lld_drivers;
 	const usbh_dev_driver_t * const *dev_drivers;
 	int8_t address_temporary;
-} usbh_data = {0};
+} usbh_data = {};
 
 static void set_enumeration(void)
 {
@@ -58,8 +58,8 @@ void device_remove(usbh_device_t *dev)
 		dev->drv->remove(dev->drvdata);
 	}
 	dev->address = -1;
-	dev->drv = 0;
-	dev->drvdata = 0;
+	dev->drv = NULL;
+	dev->drvdata = NULL;
 }
 
 /**
@@ -105,11 +105,10 @@ static bool find_driver(usbh_device_t *dev, const usbh_dev_driver_info_t * devic
 static void device_register(void *descriptors, uint16_t descriptors_len, usbh_device_t *dev)
 {
 	uint32_t i = 0;
-	dev->drv = 0;
 	uint8_t *buf = (uint8_t *)descriptors;
 
-	dev->drv = 0;
-	dev->drvdata = 0;
+	dev->drv = NULL;
+	dev->drvdata = NULL;
 
 	uint8_t desc_len = buf[i];
 	uint8_t desc_type = buf[i + 1];
@@ -285,7 +284,7 @@ static void control_state_machine(usbh_device_t *dev, usbh_packet_callback_data_
 		} else {
 			if (dev->control.data_length == 0) {
 				dev->control.state = USBH_CONTROL_STATE_STATUS;
-				device_xfer_control_read(0, 0, control_state_machine, dev);
+				device_xfer_control_read(NULL, 0, control_state_machine, dev);
 			} else {
 				dev->control.state = USBH_CONTROL_STATE_DATA;
 				device_xfer_control_write_data(dev->control.data.out, dev->control.data_length, control_state_machine, dev);
@@ -315,7 +314,7 @@ static void control_state_machine(usbh_device_t *dev, usbh_packet_callback_data_
 				dev->control.callback(dev, cb_data);
 			} else {
 				dev->control.state = USBH_CONTROL_STATE_STATUS;
-				device_xfer_control_read(0, 0, control_state_machine, dev);
+				device_xfer_control_read(NULL, 0, control_state_machine, dev);
 			}
 		}
 		break;
diff --git a/src/usbh_driver_ac_midi.c b/src/usbh_driver_ac_midi.c
index 0a747f7..9d139d5 100644
--- a/src/usbh_driver_ac_midi.c
+++ b/src/usbh_driver_ac_midi.c
@@ -24,6 +24,8 @@
 #include "usbh_driver_ac_midi_private.h"
 #include "usart_helpers.h"
 
+#include <stddef.h>
+
 #include <libopencm3/usb/midi.h>
 #include <libopencm3/usb/audio.h>
 #include <libopencm3/usb/usbstd.h>
@@ -35,7 +37,7 @@ static void poll(void *drvdata, uint32_t tflp);
 static void remove(void *drvdata);
 
 static midi_device_t midi_device[USBH_AC_MIDI_MAX_DEVICES];
-static const midi_config_t *midi_config = 0;
+static const midi_config_t *midi_config = NULL;
 static bool initialized = false;
 
 static const usbh_dev_driver_info_t usbh_midi_driver_info = {
@@ -77,7 +79,7 @@ static void *init(void *usbh_dev)
 		return 0;
 	}
 	uint32_t i;
-	midi_device_t *drvdata = 0;
+	midi_device_t *drvdata = NULL;
 
 	// find free data space for midi device
 	for (i = 0; i < USBH_AC_MIDI_MAX_DEVICES; i++) {
@@ -89,7 +91,7 @@ static void *init(void *usbh_dev)
 			drvdata->endpoint_in_toggle = 0;
 			drvdata->endpoint_out_toggle = 0;
 			drvdata->usbh_device = usbh_dev;
-			drvdata->write_callback_user = 0;
+			drvdata->write_callback_user = NULL;
 			drvdata->sending = false;
 			break;
 		}
diff --git a/src/usbh_driver_hid.c b/src/usbh_driver_hid.c
index 54956b2..0e90ab0 100644
--- a/src/usbh_driver_hid.c
+++ b/src/usbh_driver_hid.c
@@ -28,6 +28,7 @@
 #include <libopencm3/usb/usbstd.h>
 #include <libopencm3/usb/hid.h>
 #include <stdint.h>
+#include <stddef.h>
 
 #define USB_HID_SET_REPORT 0x09
 #define USB_HID_SET_IDLE 0x0A
@@ -100,7 +101,7 @@ static void *init(void *usbh_dev)
 	}
 
 	uint32_t i;
-	hid_device_t *drvdata = 0;
+	hid_device_t *drvdata = NULL;
 
 	// find free data space for HID device
 	for (i = 0; i < USBH_HID_MAX_DEVICES; i++) {
diff --git a/src/usbh_driver_hub.c b/src/usbh_driver_hub.c
index 7dc99ea..2127158 100644
--- a/src/usbh_driver_hub.c
+++ b/src/usbh_driver_hub.c
@@ -25,6 +25,7 @@
 #include "usart_helpers.h"

 #include "usbh_config.h"

 

+#include <stddef.h>

 #include <stdint.h>

 

 static hub_device_t hub_device[USBH_MAX_HUBS];

@@ -52,7 +53,7 @@ static void *init(void *usbh_dev)
 	}

 

 	uint32_t i;

-	hub_device_t *drvdata = 0;

+	hub_device_t *drvdata = NULL;

 	// find free data space for hub device

 	for (i = 0; i < USBH_MAX_HUBS; i++) {

 		if (hub_device[i].device[0] == 0) {