HC32F460 ADC转换速度比预计的慢一倍，是怎么回事呢？

只看该作者 · 2022-2-24 17:25

/* Set bus clk div. */
stcSysClkCfg.enHclkDiv = ClkSysclkDiv1;    //200M, Max 200MHz CPU DMA Flash SRAM
stcSysClkCfg.enExclkDiv = ClkSysclkDiv2; //100M, Max 100MHz SDIO CAN
stcSysClkCfg.enPclk0Div = ClkSysclkDiv1; //200M, Max 200MHz Timer6
stcSysClkCfg.enPclk1Div = ClkSysclkDiv2; //100M, Max 100MHz USARTx TIM SPI
stcSysClkCfg.enPclk2Div = ClkSysclkDiv4; // 50M, Max  60MHz ADC
stcSysClkCfg.enPclk3Div = ClkSysclkDiv4; // 50M, Max  50MHz RTC I2C CMP WDT
stcSysClkCfg.enPclk4Div = ClkSysclkDiv2; //100M, Max 100MHz ADC TRNG
CLK_SysClkConfig(&stcSysClkCfg);

//ADC Clock set, PCLK2=50MHz PCLK4=100MHz
//Select PCLK2 as adc analog clok, PCLK4 as adc digital clock.
CLK_SetPeriClkSource(ClkPeriSrcPclk);

//ADCCLK=50MHz -> 200Ksps, Tsamp + Tconv_13clk = 250clk
//实际使用中，400sps用了4ms, 改成112+13速度恢复正常
uint8_t au8Adc1SaSampTime[1] = {112};