using libopencm3 (real OpenSource - no questionable STMicroelectronics License) to build cheapest CAN Adapter ever:
it's not possible to use CAN and USB at the same time on STM32F103
either use MCP2562 or ISO1050 transceiver - not both !
/* CAN1 / CAN GPIO */
#define GPIO_CAN_PB_RX GPIO8 /* PB8 */
#define GPIO_CAN_PB_TX GPIO9 /* PB9 */
using SWD interface with st-flash or serial loader stm32-flash (works only with USART1)
/* USART1 GPIO */
#define GPIO_USART1_TX GPIO9 /* PA9 */
#define GPIO_USART1_RX GPIO10 /* PA10 */
Hardware handshaking and LEDs usage is still missing as of today - is made sometime.
connect your favorite/cheap 3V3 USB2Serial board to USART2:
/* USART2 GPIO */
#define GPIO_USART2_CTS GPIO0 /* PA0 */
#define GPIO_USART2_RTS GPIO1 /* PA1 */
#define GPIO_USART2_TX GPIO2 /* PA2 */
#define GPIO_USART2_RX GPIO3 /* PA3 */
and do:
sudo modprobe can
sudo modprobe can-raw
sudo modprobe slcan
sudo slcand -s5 -S2000000 /dev/ttyUSB0 can0 # CAN Speed 5 ->250 kBaud, 2,000,000 Baud serial
ifconfig can0 up
Now you can use it as SocketCAN interface - enjoy :-)
Schematic https://github.com/GBert/misc/raw/master/stm32-slcan/pictures/arduino_stm32f103c8t6_schematics.png https://github.com/GBert/misc/raw/master/stm32-slcan/pictures/STM32F103C8T6-DEV-BOARD-SCH.pdf
more information here: https://wiki.kewl.org/dokuwiki/boards:vcc-gnd
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