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stm32f4: Add support for STM32F103

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-07-28 14:40:41 -04:00 • committed by KevinOConnor
parent 485164b8b3
commit 7efc53ff59
7 changed files with 191 additions and 17 deletions
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24
src/stm32f4/adc.c
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@ -8,6 +8,7 @@
#include "board/misc.h" // timer_from_us
#include "command.h" // shutdown
#include "compiler.h" // ARRAY_SIZE
#include "generic/armcm_timer.h" // udelay
#include "gpio.h" // gpio_adc_setup
#include "internal.h" // GPIO
#include "sched.h" // sched_shutdown
@ -21,6 +22,12 @@ static const uint8_t adc_pins[] = {
GPIO('C', 2), GPIO('C', 3), GPIO('C', 4), GPIO('C', 5)
};
#if CONFIG_MACH_STM32F1xx
#define CR2_FLAGS (ADC_CR2_ADON | (7 << ADC_CR2_EXTSEL_Pos) | ADC_CR2_EXTTRIG)
#else
#define CR2_FLAGS ADC_CR2_ADON
#endif
struct gpio_adc
gpio_adc_setup(uint32_t pin)
{
@ -36,14 +43,22 @@ gpio_adc_setup(uint32_t pin)
// Enable the ADC
if (!is_enabled_pclock(ADC1_BASE)) {
enable_pclock(ADC1_BASE);
uint32_t aticks = 3; // 56 adc cycles
uint32_t aticks = 3; // 2.5-3.2us (depending on stm32 chip)
ADC1->SMPR1 = (aticks | (aticks << 3) | (aticks << 6) | (aticks << 9)
| (aticks << 12) | (aticks << 15) | (aticks << 18)
| (aticks << 21) | (aticks << 24));
ADC1->SMPR2 = (aticks | (aticks << 3) | (aticks << 6) | (aticks << 9)
| (aticks << 12) | (aticks << 15) | (aticks << 18)
| (aticks << 21) | (aticks << 24) | (aticks << 27));
ADC1->CR2 = ADC_CR2_ADON;
ADC1->CR2 = CR2_FLAGS;
#if CONFIG_MACH_STM32F1xx
// Perform calibration
udelay(timer_from_us(1));
ADC1->CR2 = ADC_CR2_CAL | CR2_FLAGS;
while (ADC1->CR2 & ADC_CR2_CAL)
;
#endif
}
gpio_peripheral(pin, GPIO_ANALOG, 0);
@ -67,9 +82,10 @@ gpio_adc_sample(struct gpio_adc g)
}
// Start sample
ADC1->SQR3 = g.chan;
ADC1->CR2 = ADC_CR2_SWSTART | ADC_CR2_ADON;
ADC1->CR2 = ADC_CR2_SWSTART | CR2_FLAGS;
need_delay:
return timer_from_us(4);
return timer_from_us(10);
}
// Read a value; use only after gpio_adc_sample() returns zero