M263A的EPWM Period应该怎么计算？

250 epwm

问答对人有帮助，内容完整，我也想知道答案 0 #include #include "NuMicro.h" /---------------------------------------------------------------------------------------------------------/ /* Macro, type and constant definitions / /---------------------------------------------------------------------------------------------------------/ /---------------------------------------------------------------------------------------------------------/ / Global variables / /---------------------------------------------------------------------------------------------------------/ void SYS_Init(void) { / Set PF multi-function pins for XT1_OUT(PF.2) and XT1_IN(PF.3) / SYS->GPF_MFPL = (SYS->GPF_MFPL & (~SYS_GPF_MFPL_PF2MFP_Msk)) \| XT1_OUT_PF2; SYS->GPF_MFPL = (SYS->GPF_MFPL & (~SYS_GPF_MFPL_PF3MFP_Msk)) \| XT1_IN_PF3; /---------------------------------------------------------------------------------------------------------/ / Init System Clock / /---------------------------------------------------------------------------------------------------------/ / Enable HIRC clock (Internal RC 22.1184 MHz) / CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk); / Waiting for HIRC clock ready / CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk); / Select HCLK clock source as HIRC and and HCLK clock divider as 1 / CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1)); / Enable HXT clock (external XTAL 12MHz) / CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk); / Waiting for HXT clock ready / CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk); / Enable PLL / CLK->PLLCTL = CLK_PLLCTL_128MHz_HIRC; / Waiting for PLL stable / CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk); / Select HCLK clock source as PLL and HCLK source divider as 2 / CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL, CLK_CLKDIV0_HCLK(2)); / Waiting for PLL clock ready / CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk); / Enable EPWM1 module clock / CLK_EnableModuleClock(EPWM1_MODULE); /---------------------------------------------------------------------------------------------------------/ / EPWM clock frequency configuration / /---------------------------------------------------------------------------------------------------------/ CLK_SetModuleClock(EPWM1_MODULE, CLK_CLKSEL2_EPWM1SEL_PCLK1, 0); / Enable UART module clock / CLK_EnableModuleClock(UART0_MODULE); / Select UART module clock source as HXT and UART module clock divider as 1 / CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HXT, CLK_CLKDIV0_UART0(1)); / Reset EPWM1 module / SYS_ResetModule(EPWM1_RST); / Update System Core Clock / SystemCoreClockUpdate(); /---------------------------------------------------------------------------------------------------------/ / Init I/O Multi-function / /---------------------------------------------------------------------------------------------------------/ / Set multi-function pins for UART0 RXD and TXD / SYS->GPB_MFPH = (SYS->GPB_MFPH & (~(UART0_RXD_PB12_Msk \| UART0_TXD_PB13_Msk))) \| UART0_RXD_PB12 \| UART0_TXD_PB13; / Set PC multi-function pins for EPWM1 Channel 0~1 / SYS->GPC_MFPL = (SYS->GPC_MFPL & (~SYS_GPC_MFPL_PC5MFP_Msk)) \| EPWM1_CH0_PC5; SYS->GPC_MFPL = (SYS->GPC_MFPL & (~SYS_GPC_MFPL_PC4MFP_Msk)) \| EPWM1_CH1_PC4; } void UART0_Init() { /---------------------------------------------------------------------------------------------------------/ / Init UART / /---------------------------------------------------------------------------------------------------------/ / Configure UART0 and set UART0 baud rate / UART_Open(UART0, 115200); } /---------------------------------------------------------------------------------------------------------/ / Main Function / /---------------------------------------------------------------------------------------------------------/ int32_t main(void) { / Init System, IP clock and multi-function I/O In the end of SYS_Init() will issue SYS_LockReg() to lock protected register. If user want to write protected register, please issue SYS_UnlockReg() to unlock protected register if necessary / / Unlock protected registers / SYS_UnlockReg(); / Init System, IP clock and multi-function I/O / SYS_Init(); / Lock protected registers / SYS_LockReg(); / Init UART to 115200-8n1 for print message / UART0_Init(); printf("\n\nCPU @ %dHz(PLL@ %dHz)\n", SystemCoreClock, PllClock); printf("+-----------------------------------------------------------+\n"); printf("\| EPWM Driver \|\n"); printf("\| \|\n"); printf("+-----------------------------------------------------------+\n"); printf(" This code will output waveform with EPWM1 channel 0~1.\n"); printf(" I/O configuration:\n"); printf(" EPWM1 channel 0: 100 kHz, duty 40%%.\n"); printf(" EPWM1 channel 1: 100 kHz, duty 60%%.\n"); printf(" Waveform output pin: EPWM1_CH0(D3), EPWM1_CH1(D2),\n"); / Set EPWM mode as complementary mode / EPWM_ENABLE_COMPLEMENTARY_MODE(EPWM1); / EPWM1 channel 0~1 frequency and duty configuration are as follows / EPWM_ConfigOutputChannel(EPWM1, 0, 100000, 40); / Enable output of EPWM1 channel 0~1 / EPWM_EnableOutput(EPWM1, 0x3F); / Start EPWM1 counter / EPWM_Start(EPWM1, 0x3F); printf("Press any key to stop.\n"); getchar(); / Start EPWM1 counter */ EPWM_ForceStop(EPWM1, 0x3F); printf("Done."); while(1); } 用sample code修改得到了一对互补的EPWM，频率100Hz，占空比是40%和60%，怎么计算技术手册里边的EPWM Period？公式里的PERIOD，CLKPSC，EPWMx_CLK在这里都是多少？uvision里能不能看到对应计数器的动作（用来验证EPWM Period）？ 0
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答案对人有帮助，有参考价值 0 sp; /#define EPWM_CH 3 / EPWM channel /#define EPWM_CLKSRC_DIV (1) / EPWM clock source divider /#define PWM_FREQ 10000 / EPWM frequency /#define TIMER0_PERIOD 1000000 / Timer0 time-out period is 1ms when system clock is 50MHz //---------------------------------------------------------------------------------------------------------// Global variables /volatile uint32_t g_u32EPWMCount;/---------------------------------------------------------------------------------------------------------// Function prototypes /void SYS_Init(void);void UART_Init(void);void EPWM_Init(void);/---------------------------------------------------------------------------------------------------------// MAIN function /int32_t main(void) { uint8_t u8Item; / Unlock protected registers / SYS_UnlockReg(); / Init System, peripheral clock and multi-function I/O / SYS_Init(); / Init UART0 for testing / UART_Init(); printf("+---------------------------------------------------------------------+n"); printf("\| NUC029xEE EPWM Timer0 Trigger Test Sample Code \|n"); printf("+---------------------------------------------------------------------+nn"); printf("Select Test Item:n"); printf(" [0] EPWM output PDMA demon"); printf(" [1] EPWM Timer0 trigger output demon"); printf(" Other keys: abort testn"); u8Item = getchar(); if (u8Item == '0') { printf("Configure PDMA0 to transfer EPWM3 channel 0...n"); // TBA printf("Press any key to start PDMA ...n"); getchar(); / Enable Channel 3 PWM output / PWM_EnableOutput(PWM, 0x8); / Start PDMA transfer / // TBA } else if (u8Item == '1') { printf("Configure EPWM3 channel 3 to trigger Timer0...n"); / Set EPWM Timer0 trigger, counter enable/disable and enable EPWM output / EPWM_Init(); / Configure Timer0 frequency to 1Hz and start Timer0 / TIMER_Open(TIMER0, TIMER_PERIODIC_MODE, 1); TIMER_SetCompareValue(TIMER0, TIMER_CH0, TIMER0_PERIOD); TIMER_EnableInt(TIMER0); NVIC_EnableIRQ(TMR0_IRQn); TIMER_Start(TIMER0); / Enable EPWM Output path for EPWM3 channel 3 / PWM_EnableOutput(PWM, 0x80); printf("Press any key to stop Timer0 and exit test ...n"); getchar(); TIMER_Stop(TIMER0); NVIC_DisableIRQ(TMR0_IRQn); } else { printf("nAbort demo !!n"); } / Disable EPWM Output path for all PWM channels / PWM_DisableOutput(PWM, 0xF); printf("Exit testn"); / Disable PWM Timer clock / CLK_DisableModuleClock(PWMCH03_MODULE); / Disable Timer0 clock / CLK_DisableModuleClock(TMR0_MODULE); / Disable PWM and Timer0 peripheral clock / CLK_DisableModuleClock(PWM_MODULE); CLK_DisableModuleClock(TMR0_MODULE); / Disable UART clock / CLK_DisableModuleClock(UART0_MODULE); / Disable PDMA clock / CLK_DisableModuleClock(PDMA_MODULE); / Disable HIRC / CLK_DisableHIRC(); while(1); } 答案： EPWM Period的计算公式为： EPWM Period = ( PWM_Clock_Frequency / ( EPWM_Clock_Divider EPWM_Frequency ) ) - 1 其中， PWM_Clock_Frequency = APB clock frequency (Hz). EPWM_Clock_Divider = EPWM Clock source divider. EPWM_Frequency = EPWM frequency (Hz), 1 ~ 30000000. 在本代码中： PWM_Clock_Frequency = 50000000。 EPWM_Clock_Divider = 1。 EPWM_Frequency = 10000。则， EPWM Period = ( 50000000 / ( 1 * 10000 ) ) - 1 = 4999 因此，EPWM Period为4999。

2024-3-29 14:14:50 评论举报手托初梦