MSP430: Show calculated real timer frequency on 'info"

arch_info:

	@echo "CPU   Freq: ${cpu_freq} Hz"

	@echo "Timer Freq: ${timer_freq} Hz"

	@echo "Timer Freq: ${timer_freq} Hz -> $(shell src/arch/msp430fr5969lp/model.py f_timer "${cpu_freq}" "${timer_freq}")"

	@echo "I2C   Freq: ${i2c_freq} Hz"

.PHONY: arch_clean arch_help arch_info monitor program

#!/usr/bin/env python3

import numpy as np

import sys

# include/arch/msp430fr5969lp/driver/timer.h

def get_timer_frequency(f_cpu, f_timer):

    if f_cpu == 16000000:

        ta0_main_div = 8

    elif f_cpu == 8000000:

        ta0_main_div = 4

    elif f_cpu == 4000000:

        ta0_main_div = 2

    elif f_cpu == 1000000:

        ta0_main_div = 1

    else:

        raise ValueError("Invalid f_cpu")

    if f_cpu == 1000000:

        if f_timer >= 1000:

            divisor = 1

            counter = 1000 / (f_timer / 1000)

        elif f_timer >= 20:

            divisor = 1

            counter = 1000000 / f_timer

        else:

            divisor = 8 * 2

            counter = 62500 / f_timer

    else:

        if f_timer >= 1000:

            divisor = ta0_main_div * 1

            counter = 2000 / (f_timer / 1000)

        else:

            divisor = ta0_main_div * 1

            counter = 2000000 / f_timer

    return f_cpu / divisor / int(counter)

module = sys.argv[1]

if module == 'f_timer' and len(sys.argv) == 4:

    try:

        f_cpu = int(sys.argv[2])

        f_timer = int(sys.argv[3])

    except:

        sys.exit(0)

    if f_cpu != 0 and f_timer != 0:

        print('{:.2f}'.format(get_timer_frequency(f_cpu, f_timer)))