include/tc/tc_xmega.h

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#ifndef TC_TC_XMEGA_H_INCLUDED
#define TC_TC_XMEGA_H_INCLUDED

#include <assert.h>
#include <stdint.h>
#include <chip/memory-map.h>
#include <chip/tc.h>

#define tc_get_regs(id)    ((void *) (TC##id##_BASE))

static inline uint8_t tc_select_clock(uint8_t tc_id, uint32_t resolution)
{
        uint32_t tc_clk_rate = tc_get_pclk_hz(tc_id);

        if (resolution <= (tc_clk_rate / 1024))
                return TC_CLKSEL_DIV1024;
        else if (resolution <= (tc_clk_rate / 256))
                return TC_CLKSEL_DIV256;
        else if (resolution <= (tc_clk_rate / 64))
                return TC_CLKSEL_DIV64;
        else if (resolution <= (tc_clk_rate / 8))
                return TC_CLKSEL_DIV8;
        else if (resolution <= (tc_clk_rate / 4))
                return TC_CLKSEL_DIV4;
        else if (resolution <= (tc_clk_rate / 2))
                return TC_CLKSEL_DIV2;
        else
                return TC_CLKSEL_DIV1;
}

static inline uint32_t tc_get_resolution(uint8_t tc_id, uint8_t clksel)
{
        uint32_t clock_rate = tc_get_pclk_hz(tc_id);

        switch(clksel) {
        case TC_CLKSEL_OFF:
                clock_rate = 0;
                break;

        case TC_CLKSEL_DIV1024:
                clock_rate /= 1024;
                break;

        case TC_CLKSEL_DIV256:
                clock_rate /= 256;
                break;

        case TC_CLKSEL_DIV64:
                clock_rate /= 64;
                break;

        case TC_CLKSEL_DIV8:
                clock_rate /= 8;
                break;

        case TC_CLKSEL_DIV4:
                clock_rate /= 4;
                break;

        case TC_CLKSEL_DIV2:
                clock_rate /= 2;
                break;

        case TC_CLKSEL_DIV1:
                break;

        default:
                unhandled_case(clksel);
                break;
        }

        return clock_rate;
}

#endif /* TC_TC_XMEGA_H_INCLUDED */

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