diff options
Diffstat (limited to 'src/atsamd/adc.c')
| -rw-r--r-- | src/atsamd/adc.c | 59 |
1 files changed, 55 insertions, 4 deletions
diff --git a/src/atsamd/adc.c b/src/atsamd/adc.c index a48a5471..a5436982 100644 --- a/src/atsamd/adc.c +++ b/src/atsamd/adc.c @@ -12,7 +12,26 @@ #define ADC_TEMPERATURE_PIN 0xfe DECL_ENUMERATION("pin", "ADC_TEMPERATURE", ADC_TEMPERATURE_PIN); -#if CONFIG_MACH_SAMD21 +#if CONFIG_MACH_SAMC21 + +#define ADC_INPUTCTRL_MUXNEG_GND 0x18 + +#define SAMD51_ADC_SYNC(ADC, BIT) \ + while(ADC->SYNCBUSY.reg & ADC_SYNCBUSY_ ## BIT) +static const uint8_t adc_pins[] = { + /* ADC0 */ + GPIO('A', 2), GPIO('A', 3), GPIO('B', 8), GPIO('B', 9), GPIO('A', 4), + GPIO('A', 5), GPIO('A', 6), GPIO('A', 7), GPIO('A', 8), GPIO('A', 9), + GPIO('A', 10), GPIO('A', 11), + /* Padding to 16 */ + 255, 255, 255, 255, + /* ADC1 */ + GPIO('B', 0), GPIO('B', 1), GPIO('B', 2), GPIO('B', 3), GPIO('B', 8), + GPIO('B', 9), GPIO('B', 4), GPIO('B', 5), GPIO('B', 6), GPIO('B', 7), + GPIO('A', 8), GPIO('A', 9) +}; + +#elif CONFIG_MACH_SAMD21 #define SAMD51_ADC_SYNC(ADC, BIT) static const uint8_t adc_pins[] = { @@ -21,6 +40,7 @@ static const uint8_t adc_pins[] = { GPIO('B', 2), GPIO('B', 3), GPIO('B', 4), GPIO('B', 5), GPIO('B', 6), GPIO('B', 7), GPIO('A', 8), GPIO('A', 9), GPIO('A', 10), GPIO('A', 11) }; + #elif CONFIG_MACH_SAMX5 #define SAMD51_ADC_SYNC(ADC, BIT) \ @@ -53,7 +73,7 @@ static struct gpio_adc gpio_adc_pin_to_struct(uint8_t pin) } #if CONFIG_MACH_SAMD21 Adc* reg = ADC; -#elif CONFIG_MACH_SAMX5 +#elif CONFIG_MACH_SAMC21 || CONFIG_MACH_SAMX5 Adc* reg = (chan < 16 ? ADC0 : ADC1); chan %= 16; #endif @@ -69,7 +89,38 @@ adc_init(void) return; have_run_init = 1; -#if CONFIG_MACH_SAMD21 +#if CONFIG_MACH_SAMC21 + // Enable adc clock + enable_pclock(ADC0_GCLK_ID, ID_ADC0); + enable_pclock(ADC1_GCLK_ID, ID_ADC1); + + // Load calibration info + // ADC0 + uint32_t refbuf = GET_FUSE(ADC0_FUSES_BIASREFBUF); + uint32_t comp = GET_FUSE(ADC0_FUSES_BIASCOMP); + ADC0->CALIB.reg = (ADC0_FUSES_BIASREFBUF(refbuf) + | ADC0_FUSES_BIASCOMP(comp)); + + // ADC1 + refbuf = GET_FUSE(ADC1_FUSES_BIASREFBUF); + comp = GET_FUSE(ADC1_FUSES_BIASCOMP); + ADC1->CALIB.reg = (ADC0_FUSES_BIASREFBUF(refbuf) + | ADC0_FUSES_BIASCOMP(comp)); + + // Setup and enable + // ADC0 + ADC0->REFCTRL.reg = ADC_REFCTRL_REFSEL_INTVCC1; + ADC0->CTRLB.reg = ADC_CTRLB_PRESCALER_DIV128; + ADC0->SAMPCTRL.reg = ADC_SAMPCTRL_SAMPLEN(63); + ADC0->CTRLA.reg = ADC_CTRLA_ENABLE; + + // ADC1 + ADC1->REFCTRL.reg = ADC_REFCTRL_REFSEL_INTVCC1; + ADC1->CTRLB.reg = ADC_CTRLB_PRESCALER_DIV128; + ADC1->SAMPCTRL.reg = ADC_SAMPCTRL_SAMPLEN(63); + ADC1->CTRLA.reg = ADC_CTRLA_ENABLE; + +#elif CONFIG_MACH_SAMD21 // Enable adc clock enable_pclock(ADC_GCLK_ID, ID_ADC); // Load calibraiton info @@ -135,7 +186,7 @@ gpio_adc_setup(uint8_t pin) SYSCTRL->VREF.reg |= SYSCTRL_VREF_TSEN; return (struct gpio_adc){ .regs=ADC, .chan=ADC_INPUTCTRL_MUXPOS_TEMP_Val }; -#else +#elif CONFIG_MACH_SAMX5 SUPC->VREF.reg |= SUPC_VREF_TSEN; return (struct gpio_adc){ .regs=ADC0, .chan=ADC_INPUTCTRL_MUXPOS_PTAT_Val }; |