ChibiOS Free Embedded RTOS

The minimum PLL VCO frequency is defined as 192MHz in os/hal/ports/STM32/STM32F4xx/hal_lld.h. The reference manual specifies that the minimum PLL frequency is 100 MHz.

Is there a reason for this difference?

Erick

In the STM32F405, CAN1 must be enabled for CAN2 to operate correctly. The panic is there to prevent you from assuming that CAN2 will operate correctly if CAN1 has been stopped.

Just to do a quick sanity check, here is the math on the clock frequencies:
XTAL Frequency = 8 MHz
PLLVCO Frequency = XTAL * PLLN/PLLM = 8 * 192 / 8 = 192 MHz (Must be > 100 MHz and < 432 MHz)
SYSCLK Frequency = PLLVCO / PLLP = 192 / 6 = 32 MHz
USBCLK Frequency = PLLVCO / PLLQ = 192 / 4 = 48 MHz ...

Hi,

I'm running into an issue with the serial_usb driver when the system clock speed is set to 32 MHz. I've managed to reproduce it using the following patch to the STM32F4 discovery MEMS demo on the head of the 16.1.x branch:


---
demos/STM32/RT-STM32F407-DISCOVERY-MEMS/main&#46;c | 14 ...

OpenOCD support!

http://openocd.zylin.com/#/c/2200/

I agree that 1 should be a valid start filter and I also agree that num <= STM32_CAN_MAX_FILTERS.

In devices with no CAN2, I think you meant to say that can2sb is equal to 28, which is out of bounds.

The fixes you are proposing seem reasonable.

If you want to know why the defines are written in that way, you're going to have to ask ARM, as they are the ones that generated that file. If you look at the GPIO ODR register defines in stm32f4xx.h, you'll see that those fields are defined in the way that you mention (Pin 0 = 1, Pin 1 = 2, Pin 3 ...

I think it means that any changes to %.c or the Makefile will cause the source file to be recompiled.

Hi Eriks,

You've asked a few questions, and I'll try to answer each as best as I can.

1. I can't really help you with your KEIL issue, as I don't use it but it sounds like you're able to view the register values for other peripherals? Maybe there is another register definition file somewhere?

2 ...

I've seen this happen if you don't include the source file in your makefile. Try adding LCD.c to your list of sources.