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cpu/gd32v: allow reconfig PLL multiplier in clock config

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To be able to reconfigure the PLL multiplier in clock configuration, the existing value has to be reset first. This becomes necessary when changing the core clock, e.g. when booting with riotboot an application that uses USB.
This commit is contained in:
Gunar Schorcht 2023-03-20 12:07:57 +01:00
parent dc45b7bfbf
commit 9be2421890
1 changed files with 3 additions and 0 deletions
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3
cpu/gd32v/clock.c
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@ -125,6 +125,9 @@ void gd32vf103_clock_init(void)
RCU->CTL &= (RCU_CTL_IRC8MCALIB_Msk | RCU_CTL_IRC8MADJ_Msk);
RCU->CTL |= RCU_CTL_IRC8MEN_Msk;
/* reset PLL multiplier, required when configured before, e.g. in riotboot */
RCU->CFG0 &= ~(RCU_CFG0_PLLMF_3_0_Msk | RCU_CFG0_PLLMF_4_Msk);
if (IS_ACTIVE(CONFIG_BOARD_HAS_HXTAL)) {
/* if the board has an HXTAL, HXTAL is used as PLL input and PREDEV0 is set */
cpu_reg_enable_bits(&RCU->CTL, RCU_CTL_HXTALEN_Msk);