S32K144 ADC多通道采集

[强壮的书生]

在写S32 ADC底层发现所有的chn的转换结果都是集中在RO这个寄存器，有没有demo是可以实现多通道采集的

[worldy]

多通道采集一般都是一套ADC+寄存器Radc
每次转结束、中断、中断程序读取Radc，转换到下一个通道、启动新一个转换。。。。。。。。。。

[强壮的书生]

因为S32K144 AD转换结果寄存器Rn是有32个，跟外部chn是对应的上，我想应该是利用起来的

[worldy]

那么多个感觉好像没有什么用

[强壮的书生]

额，搞出来了，需要用到S32K144内部的PDB来做预触发处理的。

[justmsn]

LZ可否分享一下多通道的例程？最近被s32k搞得...

[qq_27830307]

void ADC_Init_(void) { PCC->PCCn[PCC_ADC0_INDEX] &=~ PCC_PCCn_CGC_MASK; /* Disable clock to change PCS */ PCC->PCCn[PCC_ADC0_INDEX] |= PCC_PCCn_PCS(3); /* PCS=1: Select SOSCDIV2 */ PCC->PCCn[PCC_ADC0_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable bus clock in ADC */ ADC0->CFG1 |= ADC_CFG1_ADICLK(0) /* Only ALTCLK1 is available */ |ADC_CFG1_ADIV(8) /* the clock rate is (input clock)/4 */ |ADC_CFG1_MODE(2);/* ADICLK=0: Input clk=ALTCLK1=SOSCDIV2 */ /* ADIV=0: Prescaler=1 */ /* MODE=2: 10-bit conversion */ ADC0->CFG2 = ADC_CFG2_SMPLTS(12); /* SMPLTS=12(default): sample time is 13 ADC clks */ ADC0->SC2 = ADC_SC2_ADTRG_MASK /* ADTRG=1: HW trigger */ |ADC_SC2_REFSEL(1); /* ACFE,ACFGT,ACREN=0: Compare func disabled */ /* DMAEN=0: DMA disabled */ /* REFSEL=1: Voltage reference pins= VREFH, VREEFL */ ADC0->SC1[0] = ADC_SC1_ADCH(9) ; /* Select AD9 (ADC0_SE9) @PTC1 */ ADC0->SC1[1] = ADC_SC1_ADCH(10); /* Select AD10 (ADC0_SE10) @PTC2 */ ADC0->SC1[2] = ADC_SC1_ADCH(11) ; /* Select AD11 (ADC0_SE11) @PTC3 */ ADC0->SC1[3] = ADC_SC1_ADCH(12) ; /* Select AD12 (ADC0_SE12) @PTC14 */ ADC0->SC1[4] = ADC_SC1_ADCH(13) ; /* Select AD13 (ADC0_SE11) @PTC15 */ ADC0->SC1[5] = ADC_SC1_ADCH(14) ; /* Select AD14 (ADC0_SE12) @PTC16 */ ADC0->SC3 = 0x00001000; /* CAL=0: Do not start calibration sequence */ /* ADCO=0: One conversion performed */ /* AVGE,AVGS=0: HW average function disabled */ } void PDB0_Init(void) { PCC->PCCn[PCC_PDB0_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable bus clock in PDB0 */ PDB0->SC |= PDB_SC_TRGSEL(0xF) | /* b1111: Software trigger is selected */ PDB_SC_PRESCALER(8) | /* Prescaler: 010 = per.clck/(4*MULT) = 80 / (4*1) = 20MHz */ PDB_SC_PDBIE(1) | /* PDB interrupt enabled */ PDB_SC_MULT(2) | /* 00: Multiplication factor is 1. */ PDB_SC_CONT(1) | /* Continuous mode of operation */ PDB_SC_PDBEN_MASK| /* 1: PDB enabled */ PDB_SC_LDOK_MASK; PDB0->IDLY = 10000; PDB0->MOD = PDB_MOD_MOD(14400); PDB0->CH[0].C1 |= PDB_C1_BB(0xFE) // For Continuos Pre-Trigger Mode |PDB_C1_TOS(0x0) // Pretrigger Output Select: 0=bypassed , 1=enabled | PDB_C1_EN(0x3F); // PDB channel's pre-trigger enabled //Enable_Interrupt(PDB0_IRQn); INT_SYS_InstallHandler( PDB0_IRQn, &PDB0_Handler , (isr_t*) 0); INT_SYS_EnableIRQ( PDB0_IRQn); PDB0->SC |= PDB_SC_SWTRIG_MASK; /* restart PDB counter */ } 这个是在PDB中断读取ADC值