7.1ADC test
ADC (Analog to Digital Converter) converts analog quantities into digital quantities. Some peripherals output analog voltages. In this case, you need to use ADC to convert analog quantities into digital quantities for calculation. It is often used for detection in low-power devices. Battery voltage, HC32L196 internally integrates a 12-bit ADC with 30 input channels, including 26 external pin inputs, 1 internal temperature sensor voltage, 1 1/3 power supply voltage, 1 built-in BGR1.2V voltage, DAC internal output
When using the ADC, you also need to enable the BGR control register
Let’s test the built-in temperature sensor first. It is more convenient to measure without needing to connect other external equipment.
Initialize ADC module
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void adc_init()
{
stc_adc_cfg_t stcAdcCfg;
DDL_ZERO_STRUCT(stcAdcCfg);
///< Turn on ADC/BGR peripheral clock
Sysctrl_SetPeripheralGate(SysctrlPeripheralAdcBgr, TRUE);
Bgr_BgrEnable();
Bgr_TempSensorEnable();
///< ADC initialization configuration
stcAdcCfg.enAdcMode = AdcSglMode; ///<sampling mode-single
stcAdcCfg.enAdcClkDiv = AdcMskClkDiv1; ///<sampling frequency division-1
stcAdcCfg.enAdcSampCycleSel = AdcMskSampCycle12Clk; ///<number of sampling cycles-12
stcAdcCfg.enAdcRefVolSel = AdcMskRefVolSelInBgr2p5; ///<Reference voltage selection-internal 2.5V
stcAdcCfg.enAdcOpBuf = AdcMskBufEnable; ///<Open amplifier
stcAdcCfg.enInRef = AdcMskInRefEnable; ///<Internal reference voltage enable-on
stcAdcCfg.enAdcAlign = AdcAlignRight; ///<Conversion result alignment-right
Adc_Init( & amp;stcAdcCfg);
///< Configure single sampling channel
Adc_CfgSglChannel(AdcAiTsInput);
///< Start single continuous sampling
Adc_SGL_Always_Start();
}
Then I found an error in the driver file:
After finishing writing, I found that errors were reported here all the time, and bgr.h was already included.
After checking bgr.h, I found that it was actually CRC, and my project happened to include crc.h. After modifying it to BGR, the problem was solved. When I opened the original file in the HC32L19x_DDL_Rev1.2.0.zip compressed package, it was also CRC, as was the 1.1 one. I hope it will be official. Will fix it later
There is a method for calculating temperature in the manual.
Print adc and temperature in the main loop
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int32_t main(void)
{
floatTemF;
uint16_t adc_trim;
uint32_t adc_result;
xth_init();
//Clock frequency division setting
Sysctrl_SetHCLKDiv(SysctrlHclkDiv1);
Sysctrl_SetPCLKDiv(SysctrlPclkDiv1);
flash_init();
led_init();
key_init();
timer0_init();
uart0_io_init();
uart0_init();
adc_init();
adc_trim = *((unsigned short int *)0x00100C36);
while(1)
{
if(TRUE == Adc_GetIrqStatus(AdcMskIrqSgl))
{
///< Get sample value
adc_result = Adc_GetSglResult();
TemF = 25 + 0.0795 * 2.5 * ( adc_result - adc_trim );
printf("ADC X% calibration value: X temperature: %0.1f℃",adc_result,adc_trim,TemF);
Adc_ClrIrqStatus(AdcMskIrqSgl);
}
yuyy_delay_ms(1000);
}
}
running result
Next, test the external input. Use the joystick of this game controller as input, and select PA00 and PA01 as input in the XY direction.
Select AVDD for reference voltage, sample channels 0 and 1, initialize IO and ADC modules
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void adc_io_init()
{
Sysctrl_SetPeripheralGate(SysctrlPeripheralGpio, TRUE);
Gpio_SetAnalogMode(GpioPortA, GpioPin0); //PA00 (AIN0)
Gpio_SetAnalogMode(GpioPortA, GpioPin1); //PA01 (AIN1)
}
void adc_init()
{
stc_adc_cfg_t stcAdcCfg;
stc_adc_sqr_cfg_t stcAdcSqrCfg;
DDL_ZERO_STRUCT(stcAdcCfg);
///< Turn on ADC/BGR peripheral clock
Sysctrl_SetPeripheralGate(SysctrlPeripheralAdcBgr, TRUE);
Bgr_BgrEnable();
///< ADC initialization configuration
stcAdcCfg.enAdcMode = AdcScanMode; ///<Sampling Mode-Scan
stcAdcCfg.enAdcClkDiv = AdcMskClkDiv1; ///<sampling frequency division-1
stcAdcCfg.enAdcSampCycleSel = AdcMskSampCycle8Clk; ///<number of sampling cycles-8
stcAdcCfg.enAdcRefVolSel = AdcMskRefVolSelAVDD; ///<Reference voltage selection-AVDD
stcAdcCfg.enAdcOpBuf = AdcMskBufDisable; ///<Open amplifier
stcAdcCfg.enInRef = AdcMskInRefDisable; ///<Internal reference voltage enable-off
stcAdcCfg.enAdcAlign = AdcAlignRight; ///<Conversion result alignment-right
Adc_Init( & amp;stcAdcCfg);
///< Sequential scan mode function and channel configuration
///< Note: In scan mode, when the number of configuration conversions is n, the configuration range of the conversion channel must be [SQRCH(0)MUX,SQRCH(n-1)MUX]
stcAdcSqrCfg.bSqrDmaTrig = FALSE;
stcAdcSqrCfg.enResultAcc = AdcResultAccDisable;
stcAdcSqrCfg.u8SqrCnt = 2;
Adc_SqrModeCfg( & amp;stcAdcSqrCfg);
Adc_CfgSqrChannel(AdcSQRCH0MUX, AdcExInputCH0);
Adc_CfgSqrChannel(AdcSQRCH1MUX, AdcExInputCH1);
///< Start sequential scan sampling
Adc_SQR_Start();
}
Print ADC value in main loop
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int32_t main(void)
{
uint32_t adcresult0;
uint32_t adcresult1;
xth_init();
//Clock frequency division setting
Sysctrl_SetHCLKDiv(SysctrlHclkDiv1);
Sysctrl_SetPCLKDiv(SysctrlPclkDiv1);
flash_init();
led_init();
key_init();
uart0_io_init();
uart0_init();
adc_io_init();
adc_init();
while(1)
{
if(TRUE == Adc_GetIrqStatus(AdcMskIrqSqr))
{
Adc_ClrIrqStatus(AdcMskIrqSqr);
adcresult0 = Adc_GetSqrResult(AdcSQRCH0MUX); //Get sequential scanning channel 0
adcresult1 = Adc_GetSqrResult(AdcSQRCH1MUX); //Get sequential scanning channel 1
printf("adc0:%d adc1:%d",adcresult0,adcresult1);
Adc_SQR_Start();
}
yuyy_delay_ms(200);
}
}
Shake the joystick to view changes in the printed ADC value on the serial port tool.
7.2DAC
DAC (Digital to Analog Converter) is the opposite of ADC analog-to-digital conversion. It converts digital quantity into analog quantity output. HC32L196 integrates a 12-bit single-channel DAC inside, and the output IO is PA04
Use the DAC to output some waveforms, press the button to switch waveforms, and initialize the IO and DAC modules
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void dac_io_init()
{
Sysctrl_SetPeripheralGate(SysctrlPeripheralGpio, TRUE); // Enable the peripheral clock of the GPIO module
Gpio_SetAnalogMode(GpioPortA, GpioPin4); //PA04 is used as the analog output of the DAC
}
void dac_init()
{
stc_dac_cfg_t dac_initstruct;
Sysctrl_SetPeripheralGate(SysctrlPeripheralDac, TRUE); ///< Enable the clock of the DAC module
dac_initstruct.boff_t = DacBoffDisable;
dac_initstruct.ten_t = DacTenDisable;
dac_initstruct.sref_t = DacVoltageAvcc;
dac_initstruct.wave_t = DacWaveDisable;
dac_initstruct.mamp_t = DacMenp4095;
dac_initstruct.tsel_t = DacSwTriger; ///< Software triggering method
dac_initstruct.align = DacRightAlign; ///< Right alignment
dac_initstruct.dhr12 = 0;
Dac_Init( & amp;dac_initstruct);
Dac_Cmd(TRUE);
}
Generate waveform
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void proc_dac_wave()
{
uint8_t changed = 0;
switch(wavetype)
{
case 0:
if(wavestep > 0)
wavestep -= 1;
else
{
if(dacvalue == 0)
dacvalue = 255;
else
dacvalue = 0;
changed = 1;
wavestep = 9;
}
break;
case 1:
dacvalue + =1;
changed = 1;
break;
case 2:
if(wavestep > 0)
wavestep -= 1;
else
{
wavestep = 10;
dacvalue + =15;
changed = 1;
}
break;
case 3:
if(wavestep < 255)
{
dacvalue=wavestep;
changed = 1;
}
else if(wavestep > 300 & amp; & amp; wavestep < 556)
{
dacvalue= 555 - wavestep;
changed = 1;
}
if(wavestep < 600)
wavestep + + ;
else
wavestep = 0;
break;
case 4:
if(wavestep < 90)
{
dacvalue = sinvalues[wavestep];
changed = 1;
}
else
{
dacvalue = sinvalues[180 - wavestep];
changed = 1;
}
if(wavestep < 179)
wavestep + + ;
else
wavestep = 0;
break;
case 5:
if(wavestep < 90)
{
dacvalue = 127 + (sinvalues[wavestep]/2);
changed = 1;
}
else
{
dacvalue = 128 - (sinvalues[180 - wavestep]/2);
changed = 1;
}
if(wavestep < 179)
wavestep + + ;
else
wavestep = 0;
break;
case 6:
if(wavestep < 90)
{
dacvalue = 127 + (sinvalues[wavestep]/2);
changed = 1;
}
else if(wavestep < 180)
{
dacvalue = 127 + (sinvalues[180 - wavestep]/2);
changed = 1;
}
else if(wavestep < 270)
{
dacvalue = 128 - (sinvalues[wavestep - 180]/2);
changed = 1;
}
else
{
dacvalue = 128 - (sinvalues[360 - wavestep]/2);
changed = 1;
}
if(wavestep < 359)
wavestep + + ;
else
wavestep = 0;
break;
default:
break;
}
if(changed > 0)
Dac_SetChannelData(DacRightAlign,DacBit8,dacvalue);
}
Waveform effect display, not that the oscilloscope waveform is a bit distorted
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Author: yuyy1989
Link: https://bbs.21ic.com/icview-3319844-1-1.html
Source: 21ic.com
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