Updated and backported improvements form the Lisa/M 2.0 CAN example.

examples/stm32/f1/lisa-m-1/can/README

@@ -0,0 +1,4 @@
+This test sets up the CAN interface on Lisa/M and transmits 8 bites every
+100ms. The first byte is being incremented in each cycle. The demo also
+receives messages and is displaing the first 4 bits of the first byte on the
+board LEDs.

examples/stm32/f1/lisa-m-1/can/can.c

@@ -106,15 +106,15 @@ void can_setup(void)
 	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
 	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_CANEN);
 
-	AFIO_MAPR = AFIO_MAPR_CAN1_REMAP_PORTB;
+	AFIO_MAPR |= AFIO_MAPR_CAN1_REMAP_PORTB;
 
 	/* Configure CAN pin: RX (input pull-up). */
-	gpio_set_mode(GPIOB, GPIO_MODE_INPUT,
+	gpio_set_mode(GPIO_BANK_CAN1_PB_RX, GPIO_MODE_INPUT,
 		      GPIO_CNF_INPUT_PULL_UPDOWN, GPIO_CAN1_PB_RX);
 	gpio_set(GPIOB, GPIO_CAN1_PB_RX);
 
 	/* Configure CAN pin: TX. */
-	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+	gpio_set_mode(GPIO_BANK_CAN1_PB_TX, GPIO_MODE_OUTPUT_50_MHZ,
 		      GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_CAN1_PB_TX);
 
 	/* NVIC setup. */
@@ -165,8 +165,10 @@ void sys_tick_handler(void)
 	static int temp32 = 0;
 	static u8 data[8] = {0, 1, 2, 0, 0, 0, 0, 0};
 
-	/* We call this handler every 1ms so 1000ms = 1s on/off. */
-	if (++temp32 != 1000)
+	/* We call this handler every 1ms so 100ms = 1s
+	 * Resulting in 100Hz message frequency.
+	 */
+	if (++temp32 != 100)
 		return;
 
 	temp32 = 0;