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/*
* Copyright 2020 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
void CPUFreq::set(unsigned int freq_khz)
{
/*
* Note: arch drivers assume SMCLK freq == F_CPU
*/
if (freq_khz == 16000) {
FRCTL0 = FWPW; // unlock FRAM Control
FRCTL0_L = 0x10; // one wait state before FRAM access (required for 8MHz < F_CPU <= 16 MHz)
FRCTL0_H = 0xff; // lock FRAM control by writing an invalid password
}
CSCTL0_H = CSKEY >> 8;
if (freq_khz == 16000) {
CSCTL1 = DCORSEL | DCOFSEL_4;
} else if (freq_khz == 8000) {
CSCTL1 = DCOFSEL_6;
} else if (freq_khz == 4000) {
CSCTL1 = DCOFSEL_3;
} else if (freq_khz == 1000) {
CSCTL1 = DCOFSEL_0;
}
CSCTL0_H = 0;
}
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