129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/****************************************************************************
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* arch/arm/src/eoss3/eoss3_lowputc.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <arch/board/board.h>
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#include "arm_internal.h"
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#include "chip.h"
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#include "eoss3.h"
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#include "eoss3_gpio.h"
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#include "hardware/eoss3_uart.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arm_lowputc
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*
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* Description:
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* Output one byte on the serial console
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*
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****************************************************************************/
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void arm_lowputc(char ch)
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{
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/* Wait until the TX data register is empty */
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while ((getreg32(EOSS3_UART_TFR) & UART_TFR_BUSY) != 0);
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/* Then send the character */
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putreg32((uint32_t)ch, EOSS3_UART_DR);
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}
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/****************************************************************************
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* Name: eoss3_lowsetup
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*
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* Description:
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* This performs basic initialization of the UART used for the serial
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* console. Its purpose is to get the console output available as soon
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* as possible.
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*
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****************************************************************************/
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void eoss3_lowsetup(void)
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{
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/* Configure the Baudrate
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* At this point we 9973760.0 clock on C11
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* Lets go ahead and configure the UART Baudrate to be 115200
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* This clocking configuration should probably be configured via
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* board settings but we are hard coding it all for now.
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*
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* Note there is a fixed divisor of 16 in the front
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*
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* 9973760.0 / (16 * 115200) = 5.411111111111111
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*
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* int = 5
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* frac = (5.411111111111111 - 5)*(2^6) = 26
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*
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* act_div = 5 + 26 / 2^6 = 86.578125
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* act_baud = 9973760.0 / 86.578125 = 115303
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*/
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putreg32(5, EOSS3_UART_IBRD);
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putreg32(26, EOSS3_UART_FBRD);
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/* Configure word length 8 bit */
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putreg32(UART_LCR_H_WLE_8, EOSS3_UART_LCR_H);
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/* Enable Hardware */
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putreg32(UART_CR_UARTEN | UART_CR_TXE | UART_CR_RXE, EOSS3_UART_CR);
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/* Should move these pin configuration definitions to the board */
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eoss3_configgpio(GPIO_UART_RX);
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eoss3_configgpio(GPIO_UART_TX);
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}
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