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atsamd: Add a get_pclock_frequency() helper function

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-01-18 18:52:44 -05:00
parent 8f763d80b7
commit c5fc264a07
5 changed files with 13 additions and 7 deletions
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4
src/atsamd/serial.c
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@@ -4,7 +4,6 @@
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_SERIAL_BAUD
#include "board/serial_irq.h" // serial_rx_data
#include "internal.h" // enable_pclock
#include "samd21.h" // SERCOM0
@@ -28,7 +27,8 @@ serial_init(void)
| SERCOM_USART_CTRLA_RXPO(3));
su->CTRLA.reg = areg;
su->CTRLB.reg = SERCOM_USART_CTRLB_TXEN | SERCOM_USART_CTRLB_RXEN;
uint32_t baud8 = CONFIG_CLOCK_FREQ / (2 * CONFIG_SERIAL_BAUD);
uint32_t freq = get_pclock_frequency(SERCOM0_GCLK_ID_CORE);
uint32_t baud8 = freq / (2 * CONFIG_SERIAL_BAUD);
su->BAUD.reg = (SERCOM_USART_BAUD_FRAC_BAUD(baud8 / 8)
| SERCOM_USART_BAUD_FRAC_FP(baud8 % 8));
NVIC_SetPriority(SERCOM0_IRQn, 0);