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// sam3/sam4 serial port
//
// Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
//
// 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" // gpio_peripheral
#include "sched.h" // DECL_INIT
// Serial port pins
#if CONFIG_MACH_SAM3X
#define Serial_IRQ_Handler UART_Handler
static Uart * const Port = UART;
static const uint32_t Pmc_id = ID_UART, Irq_id = UART_IRQn;
static const uint32_t rx_pin = GPIO('A', 8);
static const uint32_t tx_pin = GPIO('A', 9);
#elif CONFIG_MACH_SAM4S
#define Serial_IRQ_Handler UART1_Handler
static Uart * const Port = UART1;
static const uint32_t Pmc_id = ID_UART1, Irq_id = UART1_IRQn;
static const uint32_t rx_pin = GPIO('B', 2);
static const uint32_t tx_pin = GPIO('B', 3);
#elif CONFIG_MACH_SAM4E
#define Serial_IRQ_Handler UART0_Handler
static Uart * const Port = UART0;
static const uint32_t Pmc_id = ID_UART0, Irq_id = UART0_IRQn;
static const uint32_t rx_pin = GPIO('A', 9);
static const uint32_t tx_pin = GPIO('A', 10);
#endif
void
serial_init(void)
{
gpio_peripheral(rx_pin, 'A', 1);
gpio_peripheral(tx_pin, 'A', 0);
// Reset uart
enable_pclock(Pmc_id);
Port->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;
Port->UART_CR = (UART_CR_RSTRX | UART_CR_RSTTX
| UART_CR_RXDIS | UART_CR_TXDIS);
Port->UART_IDR = 0xFFFFFFFF;
// Enable uart
Port->UART_MR = (US_MR_CHRL_8_BIT | US_MR_NBSTOP_1_BIT | UART_MR_PAR_NO
| UART_MR_CHMODE_NORMAL);
Port->UART_BRGR = SystemCoreClock / (16 * CONFIG_SERIAL_BAUD);
Port->UART_IER = UART_IER_RXRDY;
NVIC_EnableIRQ(Irq_id);
NVIC_SetPriority(Irq_id, 0);
Port->UART_CR = UART_CR_RXEN | UART_CR_TXEN;
}
DECL_INIT(serial_init);
void __visible
Serial_IRQ_Handler(void)
{
uint32_t status = Port->UART_SR;
if (status & UART_SR_RXRDY)
serial_rx_byte(Port->UART_RHR);
if (status & UART_SR_TXRDY) {
uint8_t data;
int ret = serial_get_tx_byte(&data);
if (ret)
Port->UART_IDR = UART_IDR_TXRDY;
else
Port->UART_THR = data;
}
}
void
serial_enable_tx_irq(void)
{
Port->UART_IER = UART_IDR_TXRDY;
}
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