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| author | Kevin O'Connor <kevin@koconnor.net> | 2021-03-24 19:45:43 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2021-03-25 11:35:04 -0400 |
| commit | 6cab7bcfcb12003a538435f351a73978f5fbb954 (patch) | |
| tree | cea0989f8e40a7ed337a6cb63c79488d82c8c158 /src/lpc176x/adc.c | |
| parent | 964e3cc456941f8b6ec5f63b6ada9b28f1e67e6d (diff) | |
| download | kutter-6cab7bcfcb12003a538435f351a73978f5fbb954.tar.gz kutter-6cab7bcfcb12003a538435f351a73978f5fbb954.tar.xz kutter-6cab7bcfcb12003a538435f351a73978f5fbb954.zip | |
lpc176x: Introduce get_pclock_frequency()
Add get_pclock_frequency() - a standard way of obtaining the
peripheral clock frequency.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src/lpc176x/adc.c')
| -rw-r--r-- | src/lpc176x/adc.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/src/lpc176x/adc.c b/src/lpc176x/adc.c index 97e24c16..9eff6e53 100644 --- a/src/lpc176x/adc.c +++ b/src/lpc176x/adc.c @@ -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)); } |