49 lines
1,002 B
C
49 lines
1,002 B
C
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#include <xmc_common.h>
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void initCCU4(void);
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void connectLED(void);
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int main(void) {
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initCCU4();
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while (1) {
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};
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return 0;
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}
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void initCCU4() {
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// step2: release reset of CCU40, all following lines are equal
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//*(0x500414) = 0b100;
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// SCU_RESET->PRCLR0 = 0b100;
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SCU_RESET->PRCLR0 = SCU_RESET_PRCLR0_CCU40RS_Msk;
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// step 3
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SCU_CLK->CLKSET = SCU_CLK_CLKSET_CCUCEN_Msk;
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// step 4
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CCU40->GIDLC = CCU4_GIDLC_SPRB_Msk;
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// step 6: period value & compare value for PWM
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// choose 0xffff to be most flexible & granular
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CCU40_CC42->PRS = 0xffff;
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// CCU40_CC42->PSC = 0b1010;
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CCU40_CC42->CRS = 0xffff * (1 - 0.1);
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CCU40->GCSS = CCU4_GCSS_S2SE_Msk;
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// connect led before CCU is started
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connectLED();
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// step 8
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CCU40->GIDLC = CCU4_GIDLC_CS2I_Msk;
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// step 9
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CCU40_CC42->TCSET = CCU4_CC4_TCSET_TRBS_Msk;
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}
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void connectLED() {
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const static uint8_t ALT3 = 0b10011;
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PORT1->IOCR0 =
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(PORT1->IOCR0 & ~PORT0_IOCR0_PC1_Msk) | (ALT3 << PORT0_IOCR0_PC1_Pos);
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}
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