src/bsp/lk/platform/stellaris/debug.c

/*
 * Copyright (c) 2012 Ian McKellar
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include <stdarg.h>
#include <reg.h>
#include <debug.h>
#include <stdio.h>
#include <lib/cbuf.h>
#include <kernel/thread.h>
#include <platform/debug.h>
#include <arch/ops.h>
#include <target/debugconfig.h>
#include <arch/arm/cm.h>

#include "ti_driverlib.h"

#include "inc/hw_memmap.h"
#include "inc/hw_types.h"

#define DEBUG_UART UART0_BASE

static cbuf_t debug_rx_buf;

void stellaris_uart0_irq(void)
{
	arm_cm_irq_entry();

	//
	// Get the interrrupt status.
	//
	unsigned long ulStatus = UARTIntStatus(DEBUG_UART, true);

	//
	// Clear the asserted interrupts.
	//
	UARTIntClear(DEBUG_UART, ulStatus);

	//
	// Loop while there are characters in the receive FIFO.
	//
	bool resched = false;
	while (UARTCharsAvail(DEBUG_UART)) {
		//
		// Read the next character from the UART and write it back to the UART.
		//
		unsigned char c = UARTCharGetNonBlocking(DEBUG_UART);
		cbuf_write_char(&debug_rx_buf, c, false);

		resched = true;
	}

	arm_cm_irq_exit(resched);
}

void stellaris_debug_early_init(void)
{
	SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

	/* we only support UART0 right now */
	STATIC_ASSERT(DEBUG_UART == UART0_BASE);

	if (DEBUG_UART == UART0_BASE) {
		/* Set GPIO A0 and A1 as UART pins. */
		GPIOPinConfigure(GPIO_PA0_U0RX);
		GPIOPinConfigure(GPIO_PA1_U0TX);
		GPIOPinTypeUART(GPIO_PORTA_AHB_BASE, GPIO_PIN_0 | GPIO_PIN_1);
	}

	UARTConfigSetExpClk(DEBUG_UART, SysCtlClockGet(), 115200, UART_CONFIG_WLEN_8|UART_CONFIG_STOP_ONE|UART_CONFIG_PAR_NONE);

	UARTEnable(DEBUG_UART);
}

void stellaris_debug_init(void)
{
	cbuf_initialize(&debug_rx_buf, 16);

	/* Enable the UART interrupt. */
	UARTIntEnable(DEBUG_UART, UART_INT_RX | UART_INT_RT);

	NVIC_EnableIRQ(INT_UART0 - 16);

}

void platform_dputc(char c)
{
	if (c == '\n') {
		platform_dputc('\r');
	}

	UARTCharPut(DEBUG_UART, c);
}

int platform_dgetc(char *c, bool wait)
{
	return cbuf_read_char(&debug_rx_buf, c, wait);
}