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lpc176x: Introduce get_pclock_frequency()

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Add get_pclock_frequency() - a standard way of obtaining the
peripheral clock frequency.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2021-03-24 19:45:43 -04:00
parent 964e3cc456
commit 6cab7bcfcb
6 changed files with 23 additions and 12 deletions
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11
src/lpc176x/adc.c
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@@ -1,10 +1,9 @@
// Analog to digital support on lpc176x
//
// Copyright (C) 2018-2019 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2018-2021 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_CLOCK_FREQ
#include "board/armcm_boot.h" // armcm_enable_irq
#include "board/irq.h" // irq_save
#include "board/misc.h" // timer_from_us
@@ -67,7 +66,8 @@ gpio_adc_setup(uint8_t pin)
if (!is_enabled_pclock(PCLK_ADC)) {
// Power up ADC
enable_pclock(PCLK_ADC);
uint32_t prescal = DIV_ROUND_UP(CONFIG_CLOCK_FREQ, ADC_FREQ_MAX) - 1;
uint32_t pclk = get_pclock_frequency(PCLK_ADC);
uint32_t prescal = DIV_ROUND_UP(pclk, ADC_FREQ_MAX) - 1;
LPC_ADC->ADCR = adc_status.adcr = (1<<21) | ((prescal & 0xff) << 8);
LPC_ADC->ADINTEN = 0xff;
adc_status.chan = ADC_DONE;
@@ -102,8 +102,9 @@ gpio_adc_sample(struct gpio_adc g)
adc_status.chan = g.chan;
LPC_ADC->ADCR = adc_status.adcr | (1 << g.chan) | (1<<16);
need_delay:
return ((64 * DIV_ROUND_UP(CONFIG_CLOCK_FREQ, ADC_FREQ_MAX)
need_delay: ;
uint32_t pclk = get_pclock_frequency(PCLK_ADC);
return ((64 * DIV_ROUND_UP(pclk, ADC_FREQ_MAX)
* ARRAY_SIZE(adc_status.samples)) / 4 + timer_from_us(10));
}