KL03芯片PTM输出不了PWM波形

长毋相忘 · 发表于 2018-4-28 14:07:43

用KL03写了一段PTM的代码，发现输出不了PWM波形。想请教一下是怎么回事？ #define TPM_MOD_VAL 0x1f40

SIM_SOPT2 &= ~SIM_SOPT2_TPMSRC_MASK;
SIM_SOPT2 |= SIM_SOPT2_TPMSRC(1); //

SIM_SCGC6 |= SIM_SCGC6_TPM0_MASK;
SIM_SCGC5 |= SIM_SCGC5_PORTA_MASK;

PORTA_PCR5 &= ~(PORT_PCR_MUX_MASK|PORT_PCR_ISF_MASK);
PORTA_PCR5 |= PORT_PCR_MUX(2)|PORT_PCR_DSE_MASK;  // TPM0_CH1

TPM0_MOD = TPM_MOD_VAL;
TPM0_CNT = 0;
TPM0_SC |= TPM_SC_PS(0X01);
TPM0_C1SC = TPM_CnSC_MSB_MASK|TPM_CnSC_ELSA_MASK;  // clear on reload,set on match
TPM0_C1V = 0XFFFF;

TPM0_SC |= TPM_SC_CMOD(0X01);
TPM0_C0V = TPM_MOD_VAL / 5  + 1;