在问LMP90100AD转换问题:读到的值是乱的
1楼已经重新编辑过，看1楼即可，2、3、4楼是调试过程中的一些信息，忽略吧，暂时保留先
求高人给点思路，问题有可能出在什么地方或者还有什么方法可以查找问题点
LMP90100电路按照官网上开发板设计，测量芯片电源正常、参考电压正常，测量芯片输入通道模拟电压（0）与实际符合
LMP90100+LPC1115（ARM Cortex-M0），LMP90100的D6做DRDYB，接到LPC1115的GPIO上，只扫描通道0，通道0用的是VIN0和VIN1，已经短接
代码根据官网上下的软件包移植而来（官网上控制器用的是MSP430）
程序大致流程：中断后置位标志位，while(1)循环检测标志位，如标志位置位，则读ADC采集结果
读ADC采集结果，测试过controlledstream、直读寄存器和normalstream三种方式，每次除三个转换结果寄存器外，还会读其他寄存器验证，主要是验证ADC状态（active、standby、poweroff）、ADC数据是否可用、当前通道号、CRC，验证用的寄存器每次不会全用到
三种工作方式下，目前验证的结果：1、通过串口输出的频率验证，ODR基本正确；2、通过外围LED显示结果，GPIO寄存器设定正确；3、以上两点，初步推断SPI接口基本正常；4、LMP90100工作不正常，通道号和采样结果有较大几率异常
LPC1115中断代码
void PIOINT0_IRQHandler(void)
{
if(((LPC_GPIO0->MIS) & (1u<<1))==(1u<<1))
{
LMP_ADCDataReady[0]=1;// set flag
LPC_GPIO0->IC |=(1u<<1);
}
。。。
}//中断程序经过多种方式验证：示波器、设其他标志位等，验证结果OK
第一种直接读寄存器
prev_URA = LMP90100_URA_END;
while(1)
{
if (LMP_ADCDataReady[0])
{
LMP_ADCDataReady[0] = 0;//clear flag
for(i=0;i<5;i++)
{
TI_LMP90100_SPIWriteReg(TI_LMP90100_GPIO_DAT_REG, i, &prev_URA);//GPIO测试，外接LED灯，验证结果OK
readtestbuf[i]=TI_LMP90100_SPIReadReg(0x19+i,&prev_URA);//读ADC，包括状态、数据、CRC，验证结果fail，读到的数据（通道和结果）乱七八糟
}
...
}
第二种是通过controlledstreamread，验证结果同直读寄存器，读到的通道号和结果乱七八糟
prev_URA = LMP90100_URA_END;
while(1)
{
if (LMP_ADCDataReady[0])
{
LMP_ADCDataReady[0] = 0; // clear flag
TI_LMP90100_SPIControlledStreamReadADC(addr, read_buf, 5, &prev_URA); // read status, adc output & CRC into read_buf
ch_status = read_buf[0]; // Get Channel Status byte
ch_num = ch_status & LMP90100_CH_NUM_MASK; // Extract Channel Number
adc_data = ((uint32_t) read_buf[1] << 16)
| ((uint16_t) read_buf[2] << 8) | read_buf[3]; // form raw adc output data
crc_test = TI_LMP90100_SPICRCCheck(read_buf, 4); // test if CRC read from device matches computed
...
}
第三种：normalstream，连续采样50次，其中通道号正确和数值合理（高、中字节是0x00，低字节忽略）的只有32个
count=4;
addr = TI_LMP90100_SENDIAG_FLAGS_REG;
while(1)
{
if (LMP_ADCDataReady[0])
{
LMP_ADCDataReady[0] = 0; // clear flag
TI_LMP90100_SPINormalStreamReadADC(addr, read_buf, count, &prev_URA);
for(i=0;i<4;i++)
{
UART0_Send(read_buf[i]);
}
....
下面是normalstram方式下寄存器的设定值
#define TI_LMP90100_RESETCN_REG_VALUE (0xC3) /* Register and Conversion Reset */ #define TI_LMP90100_SPI_HANDSHAKECN_REG_VALUE (0x01) /* SPI SDO High Z Delayed */ #define TI_LMP90100_SPI_STREAMCN_REG_VALUE (0x00) /* SPI Normal Streaming mode */ #define TI_LMP90100_PWRCN_REG_VALUE (0x00) /* Active Mode */ #define TI_LMP90100_ADC_RESTART_REG_VALUE (0x00) /* Disable restart Conversion */ #define TI_LMP90100_GPIO_DIRCN_REG_VALUE (0x47) //D6 D0-D3 output/*(0x40) D6 output, D0-D5 inputs */ #define TI_LMP90100_GPIO_DAT_REG_VALUE (0x47) // D6 D0-D3 high/* (0x40)Set D6 high, others ignore */ #define TI_LMP90100_BGCALCN_REG_VALUE (0x00) /* Background Calibration OFF */ #define TI_LMP90100_SPI_DRDYBCN_REG_VALUE (0x83) /* Enable DRDYB on D6, bits 0 & 1 must be 1, others default */ #define TI_LMP90100_ADC_AUXCN_REG_VALUE (0x20) /* bypass external clock detection, internal clock, select 0uA RTD current */ #define TI_LMP90100_SPI_CRC_CN_REG_VALUE (0x00) /* disable CRC, Bit 3 must be 0, DRDYB is deasserted after ADC_DOUTL is read */ #define TI_LMP90100_SENDIAG_THLDH_REG_VALUE (0x00) /* Sensor Diagnostic Threshold High */ #define TI_LMP90100_SENDIAG_THLDL_REG_VALUE (0x00) /* Sensor Diagnostic Threshold Low */ #define TI_LMP90100_SCALCN_REG_VALUE (0x00) /* System Calibration Control Normal Mode */ #define TI_LMP90100_ADC_DONE_REG_VALUE (0xFF) /* ADC Data unAvailable */ #define TI_LMP90100_SENDIAG_FLAGS_REG_VALUE (0x00) /* Sensor Diagnostic Flags - status output */ #define TI_LMP90100_ADC_DOUT2_REG_VALUE (0x00) /* ADC Conversion Data 2 */ #define TI_LMP90100_ADC_DOUT1_REG_VALUE (0x00) /* ADC Conversion Data 1 */ #define TI_LMP90100_ADC_DOUT0_REG_VALUE (0x00) /* ADC Conversion Data 0 */ #define TI_LMP90100_SPI_CRC_DAT_REG_VALUE (0xFF) /* Reset CRC Data */ #define TI_LMP90100_CH_STS_REG_VALUE (0x00) /* Channel Status */ #define TI_LMP90100_CH_SCAN_REG_VALUE (0x00) /* Single Channel Continuous Scan: Channel 0*/ #define TI_LMP90100_CH0_INPUTCN_REG_VALUE (0x01) /* diable sensor diagnostics, default ref, vinp 0 vinn 1 */ #define TI_LMP90100_CH0_CONFIG_REG_VALUE (0x40) /* CH0 Configuratio: 26.83SPS, FGA off, buffer in signal path*/ #define TI_LMP90100_CH1_INPUTCN_REG_VALUE (0x13) /* disable sensor diagnostics, default ref, vinp 2 vinn 3 */ #define TI_LMP90100_CH1_CONFIG_REG_VALUE (0x40) /* CH1 config: 26.835SPS, FGA off, buffer in signal path */ #define TI_LMP90100_CH2_INPUTCN_REG_VALUE (0x25) /* disable sensor diagnostics, default ref, vinp 4 vinn 5 */ #define TI_LMP90100_CH2_CONFIG_REG_VALUE (0x70) /* 214.65SPS, FGA off, buffer in signal path */ #define TI_LMP90100_CH3_INPUTCN_REG_VALUE (0x37) /* disable sensor diagnostics, default ref, vinp 6 vinn 7 */ #define TI_LMP90100_CH3_CONFIG_REG_VALUE (0x70) /* 214.65SPS, FGA off, buffer in signal path */ #define TI_LMP90100_CH4_INPUTCN_REG_VALUE (0x01) /* disable sensor diagnostics, default ref, vinp 2 vinn 3 */ #define TI_LMP90100_CH4_CONFIG_REG_VALUE (0x70) /* 214.65SPS, FGA off, buffer in signal path */ #define TI_LMP90100_CH5_INPUTCN_REG_VALUE (0x13) /* disable sensor diagnostics, default ref, vinp 4 vinn 5 */ #define TI_LMP90100_CH5_CONFIG_REG_VALUE (0x70) /* 214.65SPS, FGA off, buffer in signal path */ #define TI_LMP90100_CH6_INPUTCN_REG_VALUE (0x25) /* disable sensor diagnostics, default ref, vinp 6 vinn 7 */ #define TI_LMP90100_CH6_CONFIG_REG_VALUE (0x70) /* 214.65SPS, FGA off, buffer in signal path */ #define TI_LMP90100_CH0_SCAL_OFFSET2_REG_VALUE (0x00) /* CH0 System Calibration Offset Coefficient [23:16] */ #define TI_LMP90100_CH0_SCAL_OFFSET1_REG_VALUE (0x00) /* CH0 System Calibration Offset Coefficient [15:8] */ #define TI_LMP90100_CH0_SCAL_OFFSET0_REG_VALUE (0x00) /* CH0 System Calibration Offset Coefficient [7:0] */ #define TI_LMP90100_CH0_SCAL_GAIN2_REG_VALUE (0x80) /* CH0 System Calibration Gain Coefficient [23:16] */ #define TI_LMP90100_CH0_SCAL_GAIN1_REG_VALUE (0x00) /* CH0 System Calibration Gain Coefficient [15:8] */ #define TI_LMP90100_CH0_SCAL_GAIN0_REG_VALUE (0x00) /* CH0 System Calibration Gain Coefficient [7:0] */ #define TI_LMP90100_CH0_SCAL_SCALING_REG_VALUE (0x00) /* CH0 System Calibration Scaling Coefficient */ #define TI_LMP90100_CH0_SCAL_BITS_SELECTOR_REG_VALUE (0x00) /* CH0 System Calibration Bits Selector */ #define TI_LMP90100_CH1_SCAL_OFFSET2_REG_VALUE (0x00) /* CH1 System Calibration Offset Coefficient [23:16] */ #define TI_LMP90100_CH1_SCAL_OFFSET1_REG_VALUE (0x00) /* CH1 System Calibration Offset Coefficient [15:8] */ #define TI_LMP90100_CH1_SCAL_OFFSET0_REG_VALUE (0x00) /* CH1 System Calibration Offset Coefficient [7:0] */ #define TI_LMP90100_CH1_SCAL_GAIN2_REG_VALUE (0x80) /* CH1 System Calibration Gain Coefficient [23:16] */ #define TI_LMP90100_CH1_SCAL_GAIN1_REG_VALUE (0x00) /* CH1 System Calibration Gain Coefficient [15:8] */ #define TI_LMP90100_CH1_SCAL_GAIN0_REG_VALUE (0x00) /* CH1 System Calibration Gain Coefficient [7:0] */ #define TI_LMP90100_CH1_SCAL_SCALING_REG_VALUE (0x00) /* CH1 System Calibration Scaling Coefficient */ #define TI_LMP90100_CH1_SCAL_BITS_SELECTOR_REG_VALUE (0x00) /* CH1 System Calibration Bits Selector */ #define TI_LMP90100_CH2_SCAL_OFFSET2_REG_VALUE (0x00) /* CH2 System Calibration Offset Coefficient [23:16] */ #define TI_LMP90100_CH2_SCAL_OFFSET1_REG_VALUE (0x00) /* CH2 System Calibration Offset Coefficient [15:8] */ #define TI_LMP90100_CH2_SCAL_OFFSET0_REG_VALUE (0x00) /* CH2 System Calibration Offset Coefficient [7:0] */ #define TI_LMP90100_CH2_SCAL_GAIN2_REG_VALUE (0x80) /* CH2 System Calibration Gain Coefficient [23:16] */ #define TI_LMP90100_CH2_SCAL_GAIN1_REG_VALUE (0x00) /* CH2 System Calibration Gain Coefficient [15:8] */ #define TI_LMP90100_CH2_SCAL_GAIN0_REG_VALUE (0x00) /* CH2 System Calibration Gain Coefficient [7:0] */ #define TI_LMP90100_CH2_SCAL_SCALING_REG_VALUE (0x00) /* CH2 System Calibration Scaling Coefficient */ #define TI_LMP90100_CH2_SCAL_BITS_SELECTOR_REG_VALUE (0x00) /* CH2 System Calibration Bits Selector */ #define TI_LMP90100_CH3_SCAL_OFFSET2_REG_VALUE (0x00) /* CH3 System Calibration Offset Coefficient [23:16] */ #define TI_LMP90100_CH3_SCAL_OFFSET1_REG_VALUE (0x00) /* CH3 System Calibration Offset Coefficient [15:8] */ #define TI_LMP90100_CH3_SCAL_OFFSET0_REG_VALUE (0x00) /* CH3 System Calibration Offset Coefficient [7:0] */ #define TI_LMP90100_CH3_SCAL_GAIN2_REG_VALUE (0x80) /* CH3 System Calibration Gain Coefficient [23:16] */ #define TI_LMP90100_CH3_SCAL_GAIN1_REG_VALUE (0x00) /* CH3 System Calibration Gain Coefficient [15:8] */ #define TI_LMP90100_CH3_SCAL_GAIN0_REG_VALUE (0x00) /* CH3 System Calibration Gain Coefficient [7:0] */ #define TI_LMP90100_CH3_SCAL_SCALING_REG_VALUE (0x00) /* CH3 System Calibration Scaling Coefficient */ #define TI_LMP90100_CH3_SCAL_BITS_SELECTOR_REG_VALUE (0x00) /* CH3 System Calibration Bits Selector */
为方便调试，主循环稍作修改
while(1)
{
UART0_Send(0xaa);
if (LMP_ADCDataReady[0]) //DRDYB有效,GPIO中断置位该标志
{
LMP_ADCDataReady[0] = 0;
ch_status=TI_LMP90100_SPIReadReg(0x08,&prev_URA); //0x08 PWRCN寄存器，低2位：0-actvie,1-powerdown,3-standby
UART0_Send('2');
UART0_Send(ch_status);
if(ch_status==0x00)
{
ch_status=TI_LMP90100_SPIReadReg(0x18,&prev_URA);//0x18 ADC_DONE寄存器，0xff-not available 0-0xfe available
UART0_Send('3');
UART0_Send(ch_status);
if(ch_status<0xff)
{
UART0_Send('4');
for(i=0;i<5;i++)
{
readtestbuf[i]=TI_LMP90100_SPIReadReg(0x19+i,&prev_URA);//0x19 SENDIAG_FLAGS,低三位指示通道号,0x1a 0x1b 0x1c ADC数据,0x1d CRC
UART0_Send(readtestbuf[i]);
}
}
}
}
}
串口实际收到的数据（16进制）
AA 32 00 33 00 34 00 FF FF FF FF AA AA AA AA AA AA AA A
从最后一个FF后每隔一段时间（差不多固定个数的AA）固定出现32 FF
计算了一下，32 FF之间间隔570个AA，串口波特率9600，折算一下接近1.67的ODR，从中断频率上来讲，与参数设定的ODR匹配。
问题是，程序能走到输出32 FF这里，证明中断已经发生，也即ADC完成转换，为什么0x08寄存器读到的数不是0x00而是0xff?
补充一下：
把前面测试程序的IF都去掉，程序第一次执行时，LMP90100的0x08寄存器数值为0x00，后续为0xff；LMP90100的0x18寄存器，首次执行时为0x00，后续为0xff；LMP90100的0x19寄存器，首次为0x00，后续为0xff；LMP90100的0x1a-0x1c寄存器，首次都是0xff，后续也是0xff；LMP90100的0x1d寄存器，首次是0xff，后续也是0xff。
有点迷茫了，哪位高人给个思路、方向什么的呗。。。
编辑完，自己在顶一顶，希望有高人能看到。。。