in main.c
- volatile int i;
- SYS_PROT = PSW_PROT;
- SYS_CLK_CFG = 0x01FF;
- SYS_SFT_RST = 0x00FF;
- SYS_SFT_RST = 0x0000;
- SYS_CLK_FEN = 0x0008;
- //mcpwm config
- MCPWM_PRT = 0x0000DEAD; //enter password to unlock write protection
- MCPWM_TH = 0x00000BCD;
- //-------
- //all 1
- MCPWM_TH00 = -0x00000BCD;
- MCPWM_TH01 = 0x00000BCD;
- MCPWM_DTH00 = 0;
- MCPWM_DTH01 = 0;
- MCPWM_SDCFG = 0x1 << 4; //t0 update
- MCPWM_FAIL |= 0x00000040; //moe
- MCPWM_IO01 |= 0x00000000; //cmp mode
- //-------
- MCPWM_TCLK = 0x0000000C; //ton, tclk_en, tclk_div[1:0], no div
- MCPWM_AUEN = 0x3; //enable auto update of th00 & th01
- //enable t1 event irq
- MCPWM_IE = 0x2;
- MCPWM_UPDATE = 0x0000FFFF; //write corresponding bit to trigger update
- //MCPWM_PRT = 0x0000CAFE; //write any value other than 0xDEAD to enable write protection
- NVIC_EnableIRQ(MCPWM_IRQn); //enable the adc0 interrupt
- __enable_irq(); //clr PRIMASK
- SCB->SCR &= ~0x00000010; //clr SEVONPEND
- GPIO1_POE = 0x1 << 4 | 0x1 << 5;
- GPIO1_F7654 = 0x0033;
- i = 10;
- while(i--){
- while(0x1 != (0x1 & MCPWM_IF)); //wait for MCPWM_IF[0] -TH event
- MCPWM_IF |= 0x1;
- }
- PASS;
-
in interrupt.c
- void MCPWM_IRQHandler(void)
- {
- MCPWM_IF |= 0xFF;
- GPIO0_PDO = ~GPIO0_PDO;
- if(GPIO0_PDO==0){
- if(MCPWM_TH00 != MCPWM_TH){
- GPIO1_PDO = ~GPIO1_PDO;
- MCPWM_TH00 = MCPWM_TH;
- }
- else{
- MCPWM_TH00 = -MCPWM_TH;
- GPIO2_PDO = ~GPIO2_PDO;
- }
- }
- }
综上，
TH00 = TH01 可实现mcpwm输出全0
TH00 = -TH TH01 = TH，可实现mcpwm输出全1
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