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adc

This commit is contained in:
olikraus 2017-05-27 11:40:46 +02:00
parent bdd7b5ea13
commit 79ed7670ac
2 changed files with 160 additions and 0 deletions
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71
sys/arm/stm32l031x6/clock/main.c
View File

@ -535,6 +535,77 @@ void enterStandByMode(void)
__NOP();
}
/*
ch 0..15: GPIO
ch 16: ???
ch 17: vref (bandgap)
ch18: temperature sensor
returns 12 bit result, right aligned
*/
uint16_t readADC(uint8_t ch)
{
uint16_t data;
RCC->APB2ENR |= RCC_APB2ENR_ADCEN; /* enable ADC clock */
__NOP(); /* let us wait for some time */
ADC1->CFGR2 &= ~ADC_CFGR2_CKMODE; /* select HSI16 clock */
if ( (ADC1->CR & ADC_CR_ADEN) != 0 )
{
ADC1->CR |= ADC_CR_ADDIS; /* disable ADC... maybe better execute a reset */
while ((ADC1->CR & ADC_CR_ADEN) != 0) /* wait for ADC disable, ADEN is also cleared */
{
}
}
ADC1->CR |= ADC_CR_ADVREGEN; /* enable ADC voltage regulator, probably not required, because this is automatically activated */
ADC->CCR |= ADC_CCR_VREFEN; /* Wake-up the VREFINT */
ADC->CCR |= ADC_CCR_TSEN; /* Wake-up the temperature sensor */
ADC1->CR |= ADC_CR_ADCAL; /* start calibration */
while ((ADC1->ISR & ADC_ISR_EOCAL) == 0) /* wait for clibration finished */
{
}
ADC1->ISR |= ADC_ISR_EOCAL; /* clear the status flag, by writing 1 to it */
//ADC1->CFGR1 |= ADC_CFGR1_AUTOFF; /* not required, ADC is anyway disabled */
ADC1->ISR |= ADC_ISR_ADRDY; /* clear ready flag */
ADC1->CR |= ADC_CR_ADEN; /* enable ADC */
//while ((ADC1->ISR & ADC_ISR_ADRDY) == 0) /* wait for ADC */
{
}
ADC1->CFGR1 &= ~ADC_CFGR1_EXTEN; /* software enabled conversion start */
ADC1->CFGR1 &= ~ADC_CFGR1_ALIGN; /* right alignment */
ADC1->CFGR1 &= ~ADC_CFGR1_RES; /* 12 bit resolution */
ADC1->CHSELR = 1<<ch; /* Select channel */
ADC1->SMPR |= ADC_SMPR_SMP_0 | ADC_SMPR_SMP_1 | ADC_SMPR_SMP_2; /* Select a sampling mode of 111 (very slow)*/
ADC1->CR |= ADC_CR_ADSTART; /* start the ADC conversion */
while ((ADC1->ISR & ADC_ISR_EOC) == 0) /* wait end of conversion */
{
}
data = ADC1->DR; /* get ADC result and clear the ISR_EOC flag */
if ( (ADC1->CR & ADC_CR_ADEN) != 0 )
{
ADC1->CR |= ADC_CR_ADDIS; /* disable ADC... maybe better execute a reset */
while ((ADC1->CR & ADC_CR_ADEN) != 0) /* wait for ADC disable, ADEN is also cleared */
{
}
}
ADC->CCR &= ~ADC_CCR_VREFEN; /* disable VREFINT */
ADC->CCR &= ~ADC_CCR_TSEN; /* disable temperature sensor */
ADC1->CR &= ~ADC_CR_ADVREGEN; /* disable ADC voltage regulator */
RCC->APB2ENR &= ~RCC_APB2ENR_ADCEN; /* disable ADC clock */
return data;
}
/*=======================================================================*/
int main()
{

89
sys/arm/stm32l031x6/u8x8_test/main.c
View File

@ -175,6 +175,90 @@ unsigned int initRTC(void)
return r;
}
/*
ch 0..15: GPIO
ch 16: ???
ch 17: vref (bandgap)
ch18: temperature sensor
returns 12 bit result, right aligned
*/
uint16_t readADC(uint8_t ch)
{
uint16_t data;
RCC->APB2ENR |= RCC_APB2ENR_ADCEN; /* enable ADC clock */
__NOP(); /* let us wait for some time */
ADC1->CFGR2 &= ~ADC_CFGR2_CKMODE; /* select HSI16 clock */
if ( (ADC1->CR & ADC_CR_ADEN) != 0 )
{
ADC1->CR |= ADC_CR_ADDIS; /* disable ADC... maybe better execute a reset */
while ((ADC1->CR & ADC_CR_ADEN) != 0) /* wait for ADC disable, ADEN is also cleared */
{
}
}
ADC1->CR |= ADC_CR_ADVREGEN; /* enable ADC voltage regulator, probably not required, because this is automatically activated */
ADC->CCR |= ADC_CCR_VREFEN; /* Wake-up the VREFINT */
ADC->CCR |= ADC_CCR_TSEN; /* Wake-up the temperature sensor */
ADC1->CR |= ADC_CR_ADCAL; /* start calibration */
while ((ADC1->ISR & ADC_ISR_EOCAL) == 0) /* wait for clibration finished */
{
}
ADC1->ISR |= ADC_ISR_EOCAL; /* clear the status flag, by writing 1 to it */
//ADC1->CFGR1 |= ADC_CFGR1_AUTOFF; /* not required, ADC is anyway disabled */
ADC1->ISR |= ADC_ISR_ADRDY; /* clear ready flag */
ADC1->CR |= ADC_CR_ADEN; /* enable ADC */
//while ((ADC1->ISR & ADC_ISR_ADRDY) == 0) /* wait for ADC */
{
}
ADC1->CFGR1 &= ~ADC_CFGR1_EXTEN; /* software enabled conversion start */
ADC1->CFGR1 &= ~ADC_CFGR1_ALIGN; /* right alignment */
ADC1->CFGR1 &= ~ADC_CFGR1_RES; /* 12 bit resolution */
ADC1->CHSELR = 1<<ch; /* Select channel */
ADC1->SMPR |= ADC_SMPR_SMP_0 | ADC_SMPR_SMP_1 | ADC_SMPR_SMP_2; /* Select a sampling mode of 111 (very slow)*/
ADC1->CR |= ADC_CR_ADSTART; /* start the ADC conversion */
while ((ADC1->ISR & ADC_ISR_EOC) == 0) /* wait end of conversion */
{
}
data = ADC1->DR; /* get ADC result and clear the ISR_EOC flag */
if ( (ADC1->CR & ADC_CR_ADEN) != 0 )
{
ADC1->CR |= ADC_CR_ADDIS; /* disable ADC... maybe better execute a reset */
while ((ADC1->CR & ADC_CR_ADEN) != 0) /* wait for ADC disable, ADEN is also cleared */
{
}
}
ADC->CCR &= ~ADC_CCR_VREFEN; /* disable VREFINT */
ADC->CCR &= ~ADC_CCR_TSEN; /* disable temperature sensor */
ADC1->CR &= ~ADC_CR_ADVREGEN; /* disable ADC voltage regulator */
RCC->APB2ENR &= ~RCC_APB2ENR_ADCEN; /* disable ADC clock */
return data;
}
uint8_t getTemperature(void)
{
uint32_t c1, c2, t, a, m;
c1 = *(uint16_t *)(0x1FF8007A); // 30 degree
c2 = *(uint16_t *)(0x1FF8007E); // 130 degree
a = 130UL*c1 - 30UL*c2;
m= c2-c1;
t = readADC(18);
return (m*t+a)/100UL;
}
int main()
{
@ -215,6 +299,11 @@ int main()
u8x8_SetFont(&u8x8, u8x8_font_amstrad_cpc_extended_r);
u8x8_DrawString(&u8x8, 0,0, "Hello World!");
u8x8_DrawGlyph(&u8x8, 0,1, rtcState+'0');
u8x8_DrawString(&u8x8, 0,2, "Vref:");
u8x8_DrawString(&u8x8, 7,2, u8x8_u16toa(readADC(17), 4));
u8x8_DrawString(&u8x8, 0,3, "Temp:");
u8x8_DrawString(&u8x8, 7,3, u8x8_u16toa(readADC(18), 4));
u8x8_DrawString(&u8x8, 13,3, u8x8_u16toa(getTemperature(), 2));
for(;;)
{