int main(void)
{
int value;
DelayInit();
GPIO_QuickInit(HW_GPIOD, 7, kGPIO_Mode_OPP);
GPIO_QuickInit(HW_GPIOE, 6, kGPIO_Mode_OPP);
UART_QuickInit(UART0_RX_PA01_TX_PA02, 115200);
printf("LPTMR test\r\n");
printf("PWM will generated from PC04, LPTMR will measure pulse on PC05\r\n");
printf("please connect PC04&PC05\r\n");
/* 边沿对其方式产生PWM波 */
TPM_PWM_QuickInit(TPM0_CH3_PC04, kPWM_EdgeAligned, 50);
/* 占空比 50% */
TPM_PWM_ChangeDuty(HW_TPM0, kTPM_IT_CH3, 5000);
LPTMR_PC_QuickInit(LPTMR_ALT2_PC05);
while(1)
{
value = LPTMR_PC_ReadCounter();
printf("lptmr:%dHz\r\n", value);
LPTMR_ClearCounter();
DelayMs(1000);
}
}
/**
* @brief 初始化PWM波产生
* @code
*
* //TPM0_CH0_PE24 使用FTM0模块通道0 引脚E24上产生1KHz PWM波
* FTM_PWM_QuickInit(TPM0_CH0_PE24, 1000);
* @endcode
* @param MAP : 快速初始化通道
* @param frequencyInHZ : 频率
* @retval None
*/
uint8_t TPM_PWM_QuickInit(uint32_t MAP, TPM_PWM_Mode_Type mode, uint32_t req)
{
uint8_t i;
uint32_t modulo;
uint32_t clock;
int32_t pres;
uint8_t ps = 0;
QuickInit_Type * pq = (QuickInit_Type*)&(MAP);
/* init pinmux */
for(i = 0; i < pq->io_offset; i++)
{
PORT_PinMuxConfig(pq->io_instance, pq->io_base + i, (PORT_PinMux_Type) pq->mux);
}
/* calc req and ps */
uint32_t min_val = 0xFFFF;
/* cal ps */
CLOCK_GetClockFrequency(kMCGOutClock, &clock);
// if(MCG->C6 & MCG_C6_PLLS_MASK) /* PLL */
// {
// clock /= 2;
// }
// else /* FLL */
// {
//
// }
LIB_TRACE("%s %d\r\n", __func__, clock);
pres = (clock/req)/TPM_MOD_MOD_MASK;
if((clock/req)/pres > TPM_MOD_MOD_MASK)
{
pres++;
}
for(i = 0; i < 7; i++)
{
if((ABS(pres - (1<<i))) < min_val)
{
ps = i;
min_val = ABS(pres - (1<<i));
}
}
if(pres > (1<<ps)) ps++;
if(ps > 7) ps = 7;
modulo = ((clock/(1<<ps))/req) - 1;
LIB_TRACE("input frequency:%dHz\r\n", req);
LIB_TRACE("input clk:%d\r\n", clock);
LIB_TRACE("ps:%d\r\n", pres);
LIB_TRACE("modulo:%d\r\n", modulo);
LIB_TRACE("ip_instance:%d\r\n", pq->ip_instance);
LIB_TRACE("io_instance:%d\r\n", pq->io_instance);
LIB_TRACE("io_base:%d\r\n", pq->io_base);
LIB_TRACE("io_offset:%d\r\n", pq->io_offset);
LIB_TRACE("chl:%d\r\n", pq->channel);
_TPM_InitBasic(pq->ip_instance, modulo, (TPM_ClockDiv_Type)ps);
/* set FTM mode */
switch(mode)
{
case kPWM_EdgeAligned:
TPM_SetMode(pq->ip_instance, pq->channel, kTPM_Mode_EdgeAligned);
break;
default:
LIB_TRACE("error in FTM_PWM_Init\r\n");
break;
}
/* set duty to 50% */
TPM_PWM_ChangeDuty(pq->ip_instance, pq->channel, 5000);
return pq->ip_instance;
}
