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adc

This commit is contained in:
olikraus 2017-05-27 17:18:36 +02:00
parent 79ed7670ac
commit 1940906104
1 changed files with 94 additions and 26 deletions
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120
sys/arm/stm32l031x6/u8x8_test/main.c
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@ -175,6 +175,15 @@ unsigned int initRTC(void)
return r;
}
void printBits(uint8_t y, uint16_t val)
{
int i;
for( i = 0; i < 16; i++ )
{
u8x8_DrawGlyph(&u8x8, i, y, val & (1<<(15-i)) ? '1' : '0' );
}
}
/*
ch 0..15: GPIO
ch 16: ???
@ -187,49 +196,81 @@ uint16_t readADC(uint8_t ch)
{
uint16_t data;
__disable_irq();
/* ADC RESET */
RCC->APB2ENR |= RCC_APB2ENR_ADCEN; /* enable ADC clock */
__NOP(); /* let us wait for some time */
__NOP(); /* let us wait for some time */
RCC->APB2RSTR |= RCC_APB2RSTR_ADCRST;
__NOP(); /* let us wait for some time */
__NOP(); /* let us wait for some time */
RCC->APB2RSTR &= ~RCC_APB2RSTR_ADCRST;
__NOP(); /* let us wait for some time */
__NOP(); /* let us wait for some time */
/* Enable some basic parts */
ADC1->IER = 0; /* do not allow any interrupts */
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 */
__NOP(); /* let us wait for some time */
__NOP(); /* let us wait for some time */
/* CALIBRATION */
if ((ADC1->CR & ADC_CR_ADEN) != 0) /* clear ADEN flag if required */
{
ADC1->CR &= (uint32_t)(~ADC_CR_ADEN);
}
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 */
__NOP(); /* not sure why, but some nop's are required here, at least 4 of them */
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
/* ENABLE ADC */
//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->ISR |= ADC_ISR_ADRDY; /* clear ready flag */
ADC1->CR |= ADC_CR_ADEN; /* enable ADC */
while ((ADC1->ISR & ADC_ISR_ADRDY) == 0) /* wait for ADC */
{
}
//printBits(5, ADC1->ISR );
//printBits(6, ADC1->CR );
/* CONFIGURE 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)*/
/* DO CONVERSION */
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 */
/* DISABLE ADC */
/* at this point the end of sampling and end of sequence bits are also set in ISR registr */
if ( (ADC1->CR & ADC_CR_ADEN) != 0 )
{
ADC1->CR |= ADC_CR_ADDIS; /* disable ADC... maybe better execute a reset */
@ -237,26 +278,39 @@ uint16_t readADC(uint8_t ch)
{
}
}
/* DISABLE OTHER PARTS, INCLUDING CLOCK */
ADC->CCR &= ~ADC_CCR_VREFEN; /* disable VREFINT */
ADC->CCR &= ~ADC_CCR_VREFEN; /* disable VREFINT */
ADC->CCR &= ~ADC_CCR_TSEN; /* disable temperature sensor */
ADC1->CR &= ~ADC_CR_ADVREGEN; /* disable ADC voltage regulator */
ADC1->CR &= ~ADC_CR_ADVREGEN; /* disable ADC voltage regulator */
RCC->APB2ENR &= ~RCC_APB2ENR_ADCEN; /* disable ADC clock */
__enable_irq();
return data;
}
uint8_t getTemperature(void)
uint16_t getTemperature(void)
{
uint32_t c1, c2, t, a, m;
int16_t y1, y2,x1, x2, t;
int16_t y;
c1 = *(uint16_t *)(0x1FF8007A); // 30 degree
c2 = *(uint16_t *)(0x1FF8007E); // 130 degree
a = 130UL*c1 - 30UL*c2;
m= c2-c1;
y1 = 30;
x1 = *(uint16_t *)(0x1FF8007A); // 30 degree with 3.0V
y2 = 130;
x2 = *(uint16_t *)(0x1FF8007E); // 130 degree with 3.0V
t = readADC(18);
return (m*t+a)/100UL;
//t = x1+1;
//t = 620;
y = ( (y2 - y1) * ( t - x1) ) / (x2 - x1) + y1;
u8x8_DrawString(&u8x8, 0,6, u8x8_u16toa((y2 - y1)/(x2 - x1), 5));
u8x8_DrawString(&u8x8, 7,6, u8x8_u16toa(t, 5));
u8x8_DrawString(&u8x8, 13,6, u8x8_u16toa(y, 3));
return y;
}
@ -300,13 +354,27 @@ int main()
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, 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));
u8x8_DrawString(&u8x8, 13,3, u8x8_u16toa(getTemperature(), 3));
u8x8_DrawString(&u8x8, 0,4, "c30:");
u8x8_DrawString(&u8x8, 7,4, u8x8_u16toa(*(uint16_t *)(0x1FF8007A), 4));
u8x8_DrawString(&u8x8, 0,5, "c130:");
u8x8_DrawString(&u8x8, 7,5, u8x8_u16toa(*(uint16_t *)(0x1FF8007E), 4));
for(;;)
{
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(), 3));
u8x8_DrawString(&u8x8, 0,4, "c30:");
u8x8_DrawString(&u8x8, 7,4, u8x8_u16toa(*(uint16_t *)(0x1FF8007A), 4));
u8x8_DrawString(&u8x8, 0,5, "c130:");
u8x8_DrawString(&u8x8, 7,5, u8x8_u16toa(*(uint16_t *)(0x1FF8007E), 4));
delay_micro_seconds(500000);
GPIOA->BSRR = GPIO_BSRR_BS_13; /* atomic set PA13 */
delay_micro_seconds(500000);