/**************************************************************************** * arch/arm/src/efm32/efm32_lowputc.c * * Copyright (C) 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include "up_arch.h" #include "chip/efm32_memorymap.h" #include "chip/efm32_usart.h" #include "chip/efm32_cmu.h" #include "efm32_lowputc.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Console U[S]ART base address */ #ifdef HAVE_SERIAL_CONSOLE # if defined(CONFIG_USART0_SERIAL_CONSOLE) # define CONSOLE_BASE EFM32_USART0_BASE # define CONSOLE_BAUD CONFIG_USART0_BAUD # define CONSOLE_PARITY CONFIG_USART0_PARITY # define CONSOLE_NBITS CONFIG_UART0_BITS # define CONSOLE_2STOP CONFIG_UART0_2STOP # elif defined(CONFIG_USART1_SERIAL_CONSOLE) # define CONSOLE_BASE EFM32_USART1_BASE # define CONSOLE_BAUD CONFIG_USART1_BAUD # define CONSOLE_PARITY CONFIG_USART1_PARITY # define CONSOLE_NBITS CONFIG_UART1_BITS # define CONSOLE_2STOP CONFIG_UART1_2STOP # elif defined(CONFIG_USART2_SERIAL_CONSOLE) # define CONSOLE_BASE EFM32_USART2_BASE # define CONSOLE_BAUD CONFIG_USART2_BAUD # define CONSOLE_PARITY CONFIG_USART2_PARITY # define CONSOLE_NBITS CONFIG_UART2_BITS # define CONSOLE_2STOP CONFIG_UART2_2STOP # elif defined(CONFIG_UART0_SERIAL_CONSOLE) # define CONSOLE_BASE EFM32_UART0_BASE # define CONSOLE_BAUD CONFIG_UART0_BAUD # define CONSOLE_PARITY CONFIG_UART0_PARITY # define CONSOLE_NBITS CONFIG_UART0_BITS # define CONSOLE_2STOP CONFIG_UART0_2STOP # elif defined(CONFIG_UART1_SERIAL_CONSOLE) # define CONSOLE_BASE EFM32_UART1_BASE # define CONSOLE_BAUD CONFIG_UART1_BAUD # define CONSOLE_PARITY CONFIG_UART1_PARITY # define CONSOLE_NBITS CONFIG_UART1_BITS # define CONSOLE_2STOP CONFIG_UART1_2STOP # else # error No console is selected???? Internal craziness!!! # endif #endif /* HAVE_SERIAL_CONSOLE */ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: efm32_lowsetup * * Description: * Called at the very beginning of _start. Performs low level * initialization including setup of the console UART. This UART done * early so that the serial console is available for debugging very early * in the boot sequence. * ****************************************************************************/ void efm32_lowsetup(void) { #ifdef HAVE_UART_DEVICE uint32_t regval; /* Enable clocking to configured UART/USART devices */ regval = getreg32(EFM32_CMU_HFPERCLKEN0); regval &= ~(CMU_HFPERCLKEN0_USART0 | CMU_HFPERCLKEN0_USART1 #ifdef CONFIG_EFM32_HAVE_USART2 | CMU_HFPERCLKEN0_USART2 #endif #ifdef CONFIG_EFM32_HAVE_UART0 | CMU_HFPERCLKEN0_UART0 #endif #ifdef CONFIG_EFM32_HAVE_UART1 | CMU_HFPERCLKEN0_UART1 #endif ); #ifdef CONFIG_EFM32_USART0 regval |= CMU_HFPERCLKEN0_USART0; #endif #ifdef CONFIG_EFM32_USART1 regval |= CMU_HFPERCLKEN0_USART1; #endif #ifdef CONFIG_EFM32_USART2 regval |= CMU_HFPERCLKEN0_USART2; #endif #ifdef CONFIG_EFM32_UART0 regval |= CMU_HFPERCLKEN0_UART0; #endif #ifdef CONFIG_EFM32_UART1 regval |= CMU_HFPERCLKEN0_UART1; #endif putreg32(regval, EFM32_CMU_HFPERCLKEN0); /* Set location in the ROUTE register */ #ifdef CONFIG_EFM32_USART0 regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (BOARD_USART0_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT)); putreg32(regval, EFM32_USART0_ROUTE); #endif #ifdef CONFIG_EFM32_USART1 regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (BOARD_USART1_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT)); putreg32(regval, EFM32_USART1_ROUTE); #endif #ifdef CONFIG_EFM32_USART2 regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (BOARD_USART2_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT)); putreg32(regval, EFM32_USART2_ROUTE); #endif #ifdef CONFIG_EFM32_UART0 regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (BOARD_UART0_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT)); putreg32(regval, EFM32_UART0_ROUTE); #endif #ifdef CONFIG_EFM32_UART1 regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (BOARD_UART1_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT)); putreg32(regval, EFM32_UART1_ROUTE); #endif #endif /* HAVE_UART_DEVICE */ #ifdef CONFIG_EFM32_LEUART0 # warning Missing LEUART0 support #endif #ifdef CONFIG_EFM32_LEUART1 # warning Missing LEUART1 support #endif #ifdef HAVE_SERIAL_CONSOLE /* Configure the serial console */ efm32_uartconfigure(CONSOLE_BASE, CONSOLE_BAUD, CONSOLE_PARITY, CONSOLE_NBITS, CONSOLE_2STOP); #endif } /***************************************************************************** * Name: efm32_lowputc * * Description: * Output one character to the UART using a simple polling method. * *****************************************************************************/ #ifdef HAVE_SERIAL_CONSOLE void efm32_lowputc(uint32_t ch) { /* The TX Buffer Level (TXBL) status bit indicates the level of the * transmit buffer. If TXBIL is set, TXBL is set whenever the transmit * buffer is half-full or empty. */ while ((getreg32(CONSOLE_BASE + EFM32_USART_STATUS_OFFSET) & USART_STATUS_TXBL) == 0); /* Then send the character */ putreg32((uint32_t)ch, CONSOLE_BASE + EFM32_USART_TXDATA_OFFSET); } #endif /***************************************************************************** * Name: efm32_uartconfigure * * Description: * Configure a UART as a RS-232 UART. * *****************************************************************************/ #ifdef HAVE_UART_DEVICE void efm32_uartconfigure(uintptr_t uart_base, uint32_t baud, unsigned int parity, unsigned int nbits, bool stop2) { #warning Missing logic } #endif