CC1310 ADC数据读取问题
本人使用CC1310来读取IO口的模拟电压，使用的开发板是CC1310DK_7XD，使用的例程为官方adcBufContinuous的例程。模拟引脚为DIO28，将该端口接GND后发现读到的数据并不是0，请问是什么原因。附上更改后的代码：
void conversionStartFxn(UArg arg0, UArg arg1) {
UART_Params uartParams;
ADCBuf_Handle adcBuf;
ADCBuf_Params adcBufParams;
ADCBuf_Conversion continuousConversion;
/* Create a UART with data processing off. */
UART_Params_init(&uartParams); //串口参数初始化
uartParams.writeDataMode = UART_DATA_BINARY;
uartParams.writeMode = UART_MODE_CALLBACK;
uartParams.writeCallback = uartCallback; //串口回调函数 直接返回不做任何处理
uartParams.baudRate = 115200; //波特率设置
uart = UART_open(Board_UART0, &uartParams); //打开串口0
/* Set up an ADCBuf peripheral in ADCBuf_RECURRENCE_MODE_CONTINUOUS */
ADCBuf_Params_init(&adcBufParams); //ADC参数初始化
adcBufParams.callbackFxn = adcBufCallback; //ADC回调函数 ***********************
adcBufParams.recurrenceMode = ADCBuf_RECURRENCE_MODE_CONTINUOUS; //连续输出模式
adcBufParams.returnMode = ADCBuf_RETURN_MODE_CALLBACK; //返回模式 立即返回
adcBufParams.samplingFrequency = 20; //采样频率为20
adcBuf = ADCBuf_open(Board_ADCBuf0, &adcBufParams); //打开ADC
/* Configure the conversion struct */ //配置转换结构
continuousConversion.arg = NULL; //传递给回调函数的参数
continuousConversion.adcChannel = 2; //ADC采样的通道2********
continuousConversion.sampleBuffer = sampleBufferOne; //存储转换结果的缓冲区
continuousConversion.sampleBufferTwo = sampleBufferTwo;
continuousConversion.samplesRequestedCount = ADCBUFFERSIZE; //要转换个返回的数量 100
if (!adcBuf){
System_abort("adcBuf did not open correctly\n");
}
/* Start converting. */
if (ADCBuf_convert(adcBuf, &continuousConversion, 1) != //在一个通道上启动一组转换
ADCBuf_STATUS_SUCCESS) {
System_abort("Did not start conversion process correctly\n");
}
/*
* Go to sleep in the foreground thread forever. The data will be collected
* and transfered in the background thread
*/
Task_sleep(BIOS_WAIT_FOREVER); //任务休眠 后台运行AD转换
}
回调函数
void adcBufCallback(ADCBuf_Handle handle, ADCBuf_Conversion *conversion,
void *completedADCBuffer, uint32_t completedChannel) {
uint_fast16_t i;
uint32_t valueBuf = 0;
uint32_t avgBuf = 0;
/* Adjust raw adc values and convert them to microvolts */ //调整原始ADC的值并且转换他们为微伏
ADCBuf_adjustRawValues(handle, completedADCBuffer, ADCBUFFERSIZE, //此函数调整原始ADC输出缓冲区，使得结果在同一个make的设备之间是可比较的。
completedChannel);
ADCBuf_convertAdjustedToMicroVolts(handle, completedChannel, //该功能将原始ADC输出值转换为以微伏为单位的值。
completedADCBuffer, microVoltBuffer, ADCBUFFERSIZE);
for (i = 0; i < ADCBUFFERSIZE; i++)
{
valueBuf += microVoltBuffer[i];
}
avgBuf = valueBuf/ADCBUFFERSIZE;
/* Send out the data via UART */
UART_write(uart,&avgBuf,sizeof(avgBuf));
}
配置文件CC1310DK_7XD.C
/*
* ========================== ADCBuf begin =========================================
*/
/* Place into subsections to allow the TI linker to remove items properly */
#if defined(__TI_COMPILER_VERSION__)
#pragma DATA_SECTION(ADCBuf_config, ".const:ADCBuf_config")
#pragma DATA_SECTION(adcBufCC26xxHWAttrs, ".const:adcBufCC26xxHWAttrs")
#pragma DATA_SECTION(ADCBufCC26XX_adcChannelLut, ".const:ADCBufCC26XX_adcChannelLut")
#endif
/* Include drivers */
#include <ti/drivers/ADCBuf.h>
#include <ti/drivers/adcbuf/ADCBufCC26XX.h>
/* ADC objects */
ADCBufCC26XX_Object adcBufCC26xxObjects[CC1310DK_7XD_ADCBufCOUNT];
/*
* This table converts a virtual adc channel into a dio and internal analogue input signal.
* This table is necessary for the functioning of the adcBuf driver.
* Comment out unused entries to save flash.
* Dio and internal signal pairs are hardwired. Do not remap them in the table. You may reorder entire entries though.
* The mapping of dio and internal signals is package dependent.
*/
const ADCBufCC26XX_AdcChannelLutEntry ADCBufCC26XX_adcChannelLut[] = {
{Board_ALS_OUT, ADC_COMPB_IN_AUXIO7},
{Board_DIO28_ANALOG, ADC_COMPB_IN_AUXIO2},
{Board_DIO30_ANALOG, ADC_COMPB_IN_AUXIO0},
{PIN_UNASSIGNED, ADC_COMPB_IN_VDDS}
};
const ADCBufCC26XX_HWAttrs adcBufCC26xxHWAttrs[CC1310DK_7XD_ADCBufCOUNT] = {
{
.intPriority = ~0,
.swiPriority = 0,
.adcChannelLut = ADCBufCC26XX_adcChannelLut,
.gpTimerUnit = Board_GPTIMER0A,
.gptDMAChannelMask = 1 << UDMA_CHAN_TIMER0_A,
}
};
const ADCBuf_Config ADCBuf_config[] = {
{&ADCBufCC26XX_fxnTable, &adcBufCC26xxObjects[0], &adcBufCC26xxHWAttrs[0]},
{NULL, NULL, NULL},
};
/*
* ========================== ADCBuf end =========================================
*/
/*
* ========================== ADC begin =========================================
*/
/* Place into subsections to allow the TI linker to remove items properly */
#if defined(__TI_COMPILER_VERSION__)
#pragma DATA_SECTION(ADC_config, ".const:ADC_config")
#pragma DATA_SECTION(adcCC26xxHWAttrs, ".const:adcCC26xxHWAttrs")
#endif
/* Include drivers */
#include <ti/drivers/ADC.h>
#include <ti/drivers/adc/ADCCC26XX.h>
/* ADC objects */
ADCCC26XX_Object adcCC26xxObjects[CC1310DK_7XD_ADCCOUNT];
const ADCCC26XX_HWAttrs adcCC26xxHWAttrs[CC1310DK_7XD_ADCCOUNT] = {
{
.adcDIO = Board_ALS_OUT,
.adcCompBInput = ADC_COMPB_IN_AUXIO7,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL
},
{
.adcDIO = Board_DIO28_ANALOG,
.adcCompBInput = ADC_COMPB_IN_AUXIO2,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL
},
{
.adcDIO = Board_DIO30_ANALOG,
.adcCompBInput = ADC_COMPB_IN_AUXIO0,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL
},
{
.adcDIO = PIN_UNASSIGNED,
.adcCompBInput = ADC_COMPB_IN_VDDS,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL
}
};
const ADC_Config ADC_config[] = {
{&ADCCC26XX_fxnTable, &adcCC26xxObjects[0], &adcCC26xxHWAttrs[0]},
{&ADCCC26XX_fxnTable, &adcCC26xxObjects[1], &adcCC26xxHWAttrs[1]},
{&ADCCC26XX_fxnTable, &adcCC26xxObjects[2], &adcCC26xxHWAttrs[2]},
{&ADCCC26XX_fxnTable, &adcCC26xxObjects[3], &adcCC26xxHWAttrs[3]},
{NULL, NULL, NULL},
};
/*
* ========================== ADC end =========================================
*/
希望能有大哥指出小弟哪里出错了！
这个示例代码需要用到的light sensor在smartRF 06EB板上。
light sensor信号通过Board_ALS_OU（IOID_23引脚）输入到CC1310，在CC1310DK_7XD.C文件中有相关配置代码。
.adcDIO = Board_ALS_OUT,
.adcCompBInput = ADC_COMPB_IN_AUXIO7,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL
请检查你使用的引脚是否正确。
看你自己修改后的代码，你好像使用的是Board_DIO28_ANALOG和Board_DIO30_ANALOG两个引脚作为你测试是的AD信号输入引脚。
配置是对的，其实程序也是对的。只是读取到的数据自己又做了处理，结果自己看不懂了，太尴尬了。谢谢回复。结帖了。