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avr: Rework adc and pwm pin search to be more clear 

Rework the pin search loop.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-04-10 17:46:45 -04:00
parent f9ebb8b23e
commit 15d5837322
1 changed files with 72 additions and 66 deletions
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36
src/avr/gpio.c
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@ -1,6 +1,6 @@
// GPIO functions on AVR.
//
// 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.
@ -165,10 +165,16 @@ static const uint8_t pwm_pins[ARRAY_SIZE(pwm_regs)] PROGMEM = {
struct gpio_pwm
gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val)
{
// Find pin in pwm_pins table
uint8_t chan;
for (chan=0; chan<ARRAY_SIZE(pwm_regs); chan++) {
if (READP(pwm_pins[chan]) != pin)
continue;
for (chan=0; ; chan++) {
if (chan >= ARRAY_SIZE(pwm_pins))
shutdown("Not a valid PWM pin");
if (READP(pwm_pins[chan]) == pin)
break;
}
// Map cycle_time to pwm clock divisor
const struct gpio_pwm_info *p = &pwm_regs[chan];
uint8_t flags = READP(p->flags), cs;
if (flags & GP_AFMT) {
@ -192,12 +198,12 @@ gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val)
}
volatile uint8_t *rega = READP(p->rega), *regb = READP(p->regb);
uint8_t en_bit = READP(p->en_bit);
struct gpio_digital_regs *regs = GPIO2REGS(pin);
uint8_t bit = GPIO2BIT(pin);
struct gpio_digital_regs *gpio_regs = GPIO2REGS(pin);
uint8_t gpio_bit = GPIO2BIT(pin);
struct gpio_pwm g = (struct gpio_pwm) {
(void*)READP(p->ocr), flags & GP_8BIT };
if (rega == &TCCR1A)
shutdown("Can not user timer1 for PWM; timer1 is used for timers");
shutdown("Can not use timer1 for PWM; timer1 is used for timers");
// Setup PWM timer
irqstatus_t flag = irq_save();
@ -209,13 +215,11 @@ gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val)
// Set default value and enable output
gpio_pwm_write(g, val);
*rega |= (1<<WGM00) | en_bit;
regs->mode |= bit;
gpio_regs->mode |= gpio_bit;
irq_restore(flag);
return g;
}
shutdown("Not a valid PWM pin");
}
void
gpio_pwm_write(struct gpio_pwm g, uint8_t val)
@ -259,10 +263,14 @@ DECL_CONSTANT(ADC_MAX, 1024);
struct gpio_adc
gpio_adc_setup(uint8_t pin)
{
// Find pin in adc_pins table
uint8_t chan;
for (chan=0; chan<ARRAY_SIZE(adc_pins); chan++) {
if (READP(adc_pins[chan]) != pin)
continue;
for (chan=0; ; chan++) {
if (chan >= ARRAY_SIZE(adc_pins))
shutdown("Not a valid ADC pin");
if (READP(adc_pins[chan]) == pin)
break;
}
// Enable ADC
ADCSRA |= (1<<ADPS0)|(1<<ADPS1)|(1<<ADPS2)|(1<<ADEN);
@ -277,8 +285,6 @@ gpio_adc_setup(uint8_t pin)
return (struct gpio_adc){ chan };
}
shutdown("Not a valid ADC pin");
}
enum { ADC_DUMMY=0xff };
static uint8_t last_analog_read = ADC_DUMMY;