canbus: Move canbus uuid calculation to canbus.c

Move the uuid hash calculation to canbus.c and call canbus_set_uuid()
from src/stm32/chipid.c .  This simplifies the low-level canbus
hardware code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/Kconfig

@@ -56,16 +56,11 @@ config USB_VENDOR_ID
 config USB_DEVICE_ID
     default 0x614e
 config USB_SERIAL_NUMBER_CHIPID
-    depends on HAVE_CHIPID
+    depends on HAVE_CHIPID && USBSERIAL
     default y
 config USB_SERIAL_NUMBER
     default "12345"
 
-# Generic configuration options for CANbus
-config CANBUS_FREQUENCY
-    int "CAN bus speed" if LOW_LEVEL_OPTIONS && CANSERIAL
-    default 500000
-
 menu "USB ids"
     depends on USBSERIAL && LOW_LEVEL_OPTIONS
 config USB_VENDOR_ID
@@ -78,6 +73,12 @@ config USB_SERIAL_NUMBER
     string "USB serial number" if !USB_SERIAL_NUMBER_CHIPID
 endmenu
 
+# Generic configuration options for CANbus
+config CANBUS_FREQUENCY
+    int "CAN bus speed" if LOW_LEVEL_OPTIONS && CANSERIAL
+    default 500000
+
+# Support setting gpio state at startup
 config INITIAL_PINS
     string "GPIO pins to set at micro-controller startup"
     depends on LOW_LEVEL_OPTIONS

src/generic/canbus.c

@@ -13,8 +13,11 @@
 #include "board/misc.h" // console_sendf
 #include "canbus.h" // canbus_set_uuid
 #include "command.h" // DECL_CONSTANT
+#include "fasthash.h" // fasthash64
 #include "sched.h" // sched_wake_task
 
+#define CANBUS_UUID_LEN 6
+
 // Global storage
 static struct canbus_data {
     uint32_t assigned_id;
@@ -323,9 +326,10 @@ command_get_canbus_id(uint32_t *args)
 DECL_COMMAND_FLAGS(command_get_canbus_id, HF_IN_SHUTDOWN, "get_canbus_id");
 
 void
-canbus_set_uuid(void *uuid)
+canbus_set_uuid(uint8_t *raw_uuid, uint32_t raw_uuid_len)
 {
-    memcpy(CanData.uuid, uuid, sizeof(CanData.uuid));
+    uint64_t hash = fasthash64(raw_uuid, raw_uuid_len, 0xA16231A7);
+    memcpy(CanData.uuid, &hash, sizeof(CanData.uuid));
     canbus_notify_rx();
 }
 

src/generic/canbus.h

@@ -5,7 +5,6 @@
 
 #define CANBUS_ID_ADMIN 0x3f0
 #define CANBUS_ID_ADMIN_RESP 0x3f1
-#define CANBUS_UUID_LEN 6
 
 struct canbus_msg {
     uint32_t id;
@@ -28,6 +27,6 @@ void canbus_set_filter(uint32_t id);
 // canbus.c
 void canbus_notify_tx(void);
 void canbus_process_data(struct canbus_msg *msg);
-void canbus_set_uuid(void *data);
+void canbus_set_uuid(uint8_t *raw_uuid, uint32_t raw_uuid_len);
 
 #endif // canbus.h

src/stm32/Makefile

@@ -62,7 +62,7 @@ src-$(CONFIG_SERIAL) += $(serial-src-y) generic/serial_irq.c
 canbus-src-y := generic/canbus.c ../lib/fast-hash/fasthash.c
 canbus-src-$(CONFIG_HAVE_STM32_CANBUS) += stm32/can.c
 canbus-src-$(CONFIG_HAVE_STM32_FDCANBUS) += stm32/fdcan.c
-src-$(CONFIG_CANSERIAL) += $(canbus-src-y)
+src-$(CONFIG_CANSERIAL) += $(canbus-src-y) stm32/chipid.c
 src-$(CONFIG_HAVE_GPIO_HARD_PWM) += stm32/hard_pwm.c
 
 # Binary output file rules

src/stm32/can.c

@@ -10,7 +10,6 @@
 #include "autoconf.h" // CONFIG_MACH_STM32F1
 #include "board/irq.h" // irq_disable
 #include "command.h" // DECL_CONSTANT_STR
-#include "fasthash.h" // fasthash64
 #include "generic/armcm_boot.h" // armcm_enable_irq
 #include "generic/canbus.h" // canbus_notify_tx
 #include "internal.h" // enable_pclock
@@ -272,9 +271,5 @@ can_init(void)
     if (CAN_RX0_IRQn != CAN_TX_IRQn)
         armcm_enable_irq(CAN_IRQHandler, CAN_TX_IRQn, 0);
     SOC_CAN->IER = CAN_IER_FMPIE0;
-
-    // Convert unique 96-bit chip id into 48 bit representation
-    uint64_t hash = fasthash64((uint8_t*)UID_BASE, 12, 0xA16231A7);
-    canbus_set_uuid(&hash);
 }
 DECL_INIT(can_init);

src/stm32/chipid.c

@@ -4,6 +4,7 @@
 //
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
+#include "generic/canbus.h" // canbus_set_uuid
 #include "generic/usb_cdc.h" // usb_fill_serial
 #include "generic/usbstd.h" // usb_string_descriptor
 #include "internal.h" // UID_BASE
@@ -25,9 +26,10 @@ usbserial_get_serialid(void)
 void
 chipid_init(void)
 {
-    if (!CONFIG_USB_SERIAL_NUMBER_CHIPID)
+    if (CONFIG_USB_SERIAL_NUMBER_CHIPID)
-        return;
+        usb_fill_serial(&cdc_chipid.desc, ARRAY_SIZE(cdc_chipid.data)
-    usb_fill_serial(&cdc_chipid.desc, ARRAY_SIZE(cdc_chipid.data)
+                        , (void*)UID_BASE);
-                    , (void*)UID_BASE);
+    if (CONFIG_CANSERIAL)
+        canbus_set_uuid((void*)UID_BASE, CHIP_UID_LEN);
 }
 DECL_INIT(chipid_init);

src/stm32/fdcan.c

@@ -10,7 +10,6 @@
 #include "autoconf.h" // CONFIG_MACH_STM32F1
 #include "board/irq.h" // irq_disable
 #include "command.h" // DECL_CONSTANT_STR
-#include "fasthash.h" // fasthash64
 #include "generic/armcm_boot.h" // armcm_enable_irq
 #include "generic/canbus.h" // canbus_notify_tx
 #include "generic/serial_irq.h" // serial_rx_byte
@@ -260,9 +259,5 @@ can_init(void)
     armcm_enable_irq(CAN_IRQHandler, CAN_IT0_IRQn, 0);
     SOC_CAN->ILE = FDCAN_ILE_EINT0;
     SOC_CAN->IE = FDCAN_IE_RF0NE | FDCAN_IE_TC;
-
-    // Convert unique 96-bit chip id into 48 bit representation
-    uint64_t hash = fasthash64((uint8_t*)UID_BASE, 12, 0xA16231A7);
-    canbus_set_uuid(&hash);
 }
 DECL_INIT(can_init);