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/*
* Copyright (c) 2014 Travis Geiselbrecht
*
* 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 <compiler.h>
#include <lib/cbuf.h>
#include <kernel/thread.h>
#include <platform/debug.h>
#include <arch/ops.h>
#include <arch/arm/cm.h>
#include <target/debugconfig.h>
#include <platform/lpc.h>
static cbuf_t debug_rx_buf;
/* this code is only set up to handle UART0 as the debug uart */
STATIC_ASSERT(DEBUG_UART == LPC_USART0);
void lpc_debug_early_init(void)
{
/* Use main clock rate as base for UART baud rate divider */
Chip_Clock_SetUARTBaseClockRate(Chip_Clock_GetMainClockRate(), false);
/* Setup UART */
Chip_UART_Init(DEBUG_UART);
Chip_UART_ConfigData(DEBUG_UART, UART_CFG_DATALEN_8 | UART_CFG_PARITY_NONE | UART_CFG_STOPLEN_1);
Chip_UART_SetBaud(DEBUG_UART, 115200);
Chip_UART_Enable(DEBUG_UART);
Chip_UART_TXEnable(DEBUG_UART);
}
void lpc_debug_init(void)
{
cbuf_initialize(&debug_rx_buf, 16);
/* enable uart interrupts */
Chip_UART_IntEnable(DEBUG_UART, UART_INTEN_RXRDY);
NVIC_EnableIRQ(UART0_IRQn);
}
void lpc_UART0_irq(void)
{
arm_cm_irq_entry();
/* read the rx buffer until it's empty */
while ((Chip_UART_GetStatus(DEBUG_UART) & UART_STAT_RXRDY) != 0) {
uint8_t c = Chip_UART_ReadByte(DEBUG_UART);
cbuf_write_char(&debug_rx_buf, c, false);
}
arm_cm_irq_exit(true);
}
void platform_dputc(char c)
{
if (c == '\n') {
platform_dputc('\r');
}
Chip_UART_SendBlocking(DEBUG_UART, &c, 1);
}
int platform_dgetc(char *c, bool wait)
{
#if 1
return cbuf_read_char(&debug_rx_buf, c, wait);
#else
uint8_t data;
if (Chip_UART_Read(DEBUG_UART, &data, 1) == 1) {
*c = data;
return 1;
}
return -1;
#endif
}
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