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94c86d6c6c
Most of the peripherals on the sam4e8e are similar to the ones on the sam3x8e mcu. Merge the code together and use just one code directory. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
71 lines
2 KiB
C
71 lines
2 KiB
C
// sam3/sam4 serial port
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//
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// Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include "autoconf.h" // CONFIG_SERIAL_BAUD
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#include "board/serial_irq.h" // serial_rx_data
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#include "internal.h" // gpio_peripheral
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#include "sched.h" // DECL_INIT
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// Serial port pins
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#if CONFIG_MACH_SAM3X8E
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#define Serial_IRQ_Handler UART_Handler
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static Uart * const Port = UART;
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static const uint32_t Pmc_id = ID_UART, Irq_id = UART_IRQn;
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static const uint32_t rx_pin = GPIO('A', 8);
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static const uint32_t tx_pin = GPIO('A', 9);
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#elif CONFIG_MACH_SAM4E8E
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#define Serial_IRQ_Handler UART0_Handler
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static Uart * const Port = UART0;
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static const uint32_t Pmc_id = ID_UART0, Irq_id = UART0_IRQn;
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static const uint32_t rx_pin = GPIO('A', 9);
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static const uint32_t tx_pin = GPIO('A', 10);
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#endif
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void
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serial_init(void)
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{
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gpio_peripheral(rx_pin, 'A', 1);
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gpio_peripheral(tx_pin, 'A', 0);
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// Reset uart
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PMC->PMC_PCER0 = 1 << Pmc_id;
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Port->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;
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Port->UART_CR = (UART_CR_RSTRX | UART_CR_RSTTX
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| UART_CR_RXDIS | UART_CR_TXDIS);
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Port->UART_IDR = 0xFFFFFFFF;
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// Enable uart
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Port->UART_MR = (US_MR_CHRL_8_BIT | US_MR_NBSTOP_1_BIT | UART_MR_PAR_NO
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| UART_MR_CHMODE_NORMAL);
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Port->UART_BRGR = SystemCoreClock / (16 * CONFIG_SERIAL_BAUD);
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Port->UART_IER = UART_IER_RXRDY;
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NVIC_EnableIRQ(Irq_id);
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NVIC_SetPriority(Irq_id, 0);
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Port->UART_CR = UART_CR_RXEN | UART_CR_TXEN;
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}
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DECL_INIT(serial_init);
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void __visible
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Serial_IRQ_Handler(void)
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{
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uint32_t status = Port->UART_SR;
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if (status & UART_SR_RXRDY)
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serial_rx_byte(Port->UART_RHR);
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if (status & UART_SR_TXRDY) {
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uint8_t data;
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int ret = serial_get_tx_byte(&data);
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if (ret)
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Port->UART_IDR = UART_IDR_TXRDY;
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else
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Port->UART_THR = data;
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}
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}
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void
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serial_enable_tx_irq(void)
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{
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Port->UART_IER = UART_IDR_TXRDY;
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}
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