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sam3x8e: Rework adc pin search to be more clear 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-04-11 09:56:08 -04:00
parent 15d5837322
commit 7a7b98cc31
1 changed files with 22 additions and 16 deletions
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38
src/sam3x8e/gpio.c
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@ -1,6 +1,6 @@
// GPIO functions on sam3x8e
//
// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2016,2017 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
@ -28,7 +28,7 @@ static Pio * const digital_regs[] = {
/****************************************************************
* gpio functions
* General Purpose Input Output (GPIO) pins
****************************************************************/
void
@ -116,6 +116,10 @@ gpio_in_read(struct gpio_in g)
}
/****************************************************************
* Analog to Digital Converter (ADC) pins
****************************************************************/
static const uint8_t adc_pins[] = {
GPIO('A', 2), GPIO('A', 3), GPIO('A', 4), GPIO('A', 6),
GPIO('A', 22), GPIO('A', 23), GPIO('A', 24), GPIO('A', 16),
@ -129,22 +133,24 @@ DECL_CONSTANT(ADC_MAX, 4096);
struct gpio_adc
gpio_adc_setup(uint8_t pin)
{
// Find pin in adc_pins table
int chan;
for (chan=0; chan<ARRAY_SIZE(adc_pins); chan++) {
if (adc_pins[chan] != pin)
continue;
// Found PIN
if (!(PMC->PMC_PCSR1 & (1 << (ID_ADC-32)))) {
// Setup ADC
PMC->PMC_PCER1 = 1 << (ID_ADC-32);
uint32_t prescal = SystemCoreClock / (2 * ADC_FREQ_MAX) - 1;
ADC->ADC_MR = (ADC_MR_PRESCAL(prescal)
| ADC_MR_STARTUP_SUT768
| ADC_MR_TRANSFER(1));
}
return (struct gpio_adc){ .bit = 1 << chan };
for (chan=0; ; chan++) {
if (chan >= ARRAY_SIZE(adc_pins))
shutdown("Not a valid ADC pin");
if (adc_pins[chan] == pin)
break;
}
shutdown("Not a valid ADC pin");
if (!(PMC->PMC_PCSR1 & (1 << (ID_ADC-32)))) {
// Setup ADC
PMC->PMC_PCER1 = 1 << (ID_ADC-32);
uint32_t prescal = SystemCoreClock / (2 * ADC_FREQ_MAX) - 1;
ADC->ADC_MR = (ADC_MR_PRESCAL(prescal)
| ADC_MR_STARTUP_SUT768
| ADC_MR_TRANSFER(1));
}
return (struct gpio_adc){ .bit = 1 << chan };
}
// Try to sample a value. Returns zero if sample ready, otherwise