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atsamd: Use enumerations for buses and reserve pins

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-03-31 23:37:17 -04:00
parent 7e8ecfe177
commit bc9fd03dab
9 changed files with 37 additions and 32 deletions
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11
src/atsamd/serial.c
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@@ -5,27 +5,30 @@
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "board/serial_irq.h" // serial_rx_data
#include "command.h" // DECL_CONSTANT_STR
#include "internal.h" // enable_pclock
#include "sched.h" // DECL_INIT
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA11,PA10");
void
serial_init(void)
{
// Enable serial clock
enable_pclock(SERCOM0_GCLK_ID_CORE, ID_SERCOM0);
// Enable pins
gpio_peripheral(GPIO('A', 10), 'C', 0);
gpio_peripheral(GPIO('A', 11), 'C', 0);
gpio_peripheral(GPIO('A', 10), 'C', 0);
// Configure serial
SercomUsart *su = &SERCOM0->USART;
su->CTRLA.reg = 0;
uint32_t areg = (SERCOM_USART_CTRLA_MODE(1)
| SERCOM_USART_CTRLA_DORD
| SERCOM_USART_CTRLA_SAMPR(1)
| SERCOM_USART_CTRLA_TXPO(1)
| SERCOM_USART_CTRLA_RXPO(3));
| SERCOM_USART_CTRLA_RXPO(3)
| SERCOM_USART_CTRLA_TXPO(1));
su->CTRLA.reg = areg;
su->CTRLB.reg = SERCOM_USART_CTRLB_TXEN | SERCOM_USART_CTRLB_RXEN;
su->CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN;
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)