308 lines
10 KiB
C
308 lines
10 KiB
C
/****************************************************************************
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* arch/arm/src/str71x/str71x_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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/****************************************************************************
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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 "chip.h"
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#include "arm_internal.h"
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#include "str71x.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Is there a UART enabled? */
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#if defined(CONFIG_STR71X_UART0) || defined(CONFIG_STR71X_UART1) || \
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defined(CONFIG_STR71X_UART2) || defined(CONFIG_STR71X_UART3)
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# define HAVE_UART 1
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/* Is there a serial console? */
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# if defined(CONFIG_UART0_SERIAL_CONSOLE) || defined(CONFIG_UART1_SERIAL_CONSOLE) ||\
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defined(CONFIG_UART2_SERIAL_CONSOLE) || defined(CONFIG_UART3_SERIAL_CONSOLE)
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# define HAVE_CONSOLE
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# else
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# undef HAVE_CONSOLE
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# endif
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#else
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# undef HAVE_UART
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# undef HAVE_CONSOLE
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#endif
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/* GPIO0 UART configuration bits. For each enabled UART:
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*
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* TX needs to be configured for alternate function, push-pull {1, 1, 1}
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* RX needs to be configured for input, tristate, cmos {0, 1, 0}
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*/
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#ifdef CONFIG_STR71X_UART0
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# define STR71X_UART0_GPIO0_MASK (0x0300) /* P0.8->U0.TX, B0.9->U0.RX */
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# define STR71X_UART0_GPIO0_PC0BITS (0x0200)
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# define STR71X_UART0_GPIO0_PC1BITS (0x0300)
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# define STR71X_UART0_GPIO0_PC2BITS (0x0200)
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#else
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# define STR71X_UART0_GPIO0_MASK (0)
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# define STR71X_UART0_GPIO0_PC0BITS (0)
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# define STR71X_UART0_GPIO0_PC1BITS (0)
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# define STR71X_UART0_GPIO0_PC2BITS (0)
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#endif
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#ifdef CONFIG_STR71X_UART1
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# define STR71X_UART1_GPIO0_MASK (0x0c00) /* P0,10->U1.RX, P0.11->U1.TX */
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# define STR71X_UART1_GPIO0_PC0BITS (0x0800)
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# define STR71X_UART1_GPIO0_PC1BITS (0x0c00)
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# define STR71X_UART1_GPIO0_PC2BITS (0x0800)
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#else
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# define STR71X_UART1_GPIO0_MASK (0)
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# define STR71X_UART1_GPIO0_PC0BITS (0)
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# define STR71X_UART1_GPIO0_PC1BITS (0)
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# define STR71X_UART1_GPIO0_PC2BITS (0)
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#endif
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#ifdef CONFIG_STR71X_UART2
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# define STR71X_UART2_GPIO0_MASK (0x6000) /* P0.13->U2.RX, P0.14>U2.TX */
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# define STR71X_UART2_GPIO0_PC0BITS (0x4000)
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# define STR71X_UART2_GPIO0_PC1BITS (0x6000)
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# define STR71X_UART2_GPIO0_PC2BITS (0x4000)
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#else
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# define STR71X_UART2_GPIO0_MASK (0)
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# define STR71X_UART2_GPIO0_PC0BITS (0)
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# define STR71X_UART2_GPIO0_PC1BITS (0)
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# define STR71X_UART2_GPIO0_PC2BITS (0)
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#endif
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#ifdef CONFIG_STR71X_UART3
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# define STR71X_UART3_GPIO0_MASK (0x0003) /* P0.0->U3.TX, P0.1->U3.RX */
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# define STR71X_UART3_GPIO0_PC0BITS (0x0001)
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# define STR71X_UART3_GPIO0_PC1BITS (0x0003)
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# define STR71X_UART3_GPIO0_PC2BITS (0x0001)
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#else
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# define STR71X_UART3_GPIO0_MASK (0)
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# define STR71X_UART3_GPIO0_PC0BITS (0)
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# define STR71X_UART3_GPIO0_PC1BITS (0)
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# define STR71X_UART3_GPIO0_PC2BITS (0)
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#endif
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#define STR71X_UART_GPIO0_MASK \
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(STR71X_UART0_GPIO0_MASK | STR71X_UART1_GPIO0_MASK | \
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STR71X_UART2_GPIO0_MASK | STR71X_UART3_GPIO0_MASK)
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#define STR71X_UART_GPIO0_PC0BITS \
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(STR71X_UART0_GPIO0_PC0BITS | STR71X_UART1_GPIO0_PC0BITS | \
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STR71X_UART2_GPIO0_PC0BITS | STR71X_UART3_GPIO0_PC0BITS)
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#define STR71X_UART_GPIO0_PC1BITS \
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(STR71X_UART0_GPIO0_PC1BITS | STR71X_UART1_GPIO0_PC1BITS | \
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STR71X_UART2_GPIO0_PC1BITS | STR71X_UART3_GPIO0_PC1BITS)
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#define STR71X_UART_GPIO0_PC2BITS \
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(STR71X_UART0_GPIO0_PC2BITS | STR71X_UART1_GPIO0_PC2BITS | \
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STR71X_UART2_GPIO0_PC2BITS | STR71X_UART3_GPIO0_PC2BITS)
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/* Select UART parameters for the selected console */
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#if defined(CONFIG_UART0_SERIAL_CONSOLE)
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# define STR71X_UART_BASE STR71X_UART0_BASE
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# define STR71X_UART_BAUD CONFIG_UART0_BAUD
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# define STR71X_UART_BITS CONFIG_UART0_BITS
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# define STR71X_UART_PARITY CONFIG_UART0_PARITY
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# define STR71X_UART_2STOP CONFIG_UART0_2STOP
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#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define STR71X_UART_BASE STR71X_UART1_BASE
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# define STR71X_UART_BAUD CONFIG_UART1_BAUD
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# define STR71X_UART_BITS CONFIG_UART1_BITS
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# define STR71X_UART_PARITY CONFIG_UART1_PARITY
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# define STR71X_UART_2STOP CONFIG_UART1_2STOP
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#elif defined(CONFIG_UART2_SERIAL_CONSOLE)
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# define STR71X_UART_BASE STR71X_UART2_BASE
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# define STR71X_UART_BAUD CONFIG_UART2_BAUD
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# define STR71X_UART_BITS CONFIG_UART2_BITS
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# define STR71X_UART_PARITY CONFIG_UART2_PARITY
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# define STR71X_UART_2STOP CONFIG_UART2_2STOP
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#elif defined(CONFIG_UART3_SERIAL_CONSOLE)
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# define STR71X_UART_BASE STR71X_UART3_BASE
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# define STR71X_UART_BAUD CONFIG_UART3_BAUD
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# define STR71X_UART_BITS CONFIG_UART3_BITS
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# define STR71X_UART_PARITY CONFIG_UART3_PARITY
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# define STR71X_UART_2STOP CONFIG_UART3_2STOP
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#else
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# error "No CONFIG_UARTn_SERIAL_CONSOLE Setting"
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#endif
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/* Get mode setting */
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#if STR71X_UART_BITS == 7
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# if STR71X_UART_PARITY == 0
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# error "7-bits, no parity mode not supported"
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# else
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# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE7BITP
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# endif
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#elif STR71X_UART_BITS == 8
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# if STR71X_UART_PARITY == 0
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# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE8BIT
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# else
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# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE8BITP
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# endif
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#elif STR71X_UART_BITS == 9
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# if STR71X_UART_PARITY == 0
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# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE9BIT
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# else
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# error "9-bits with parity not supported"
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# endif
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#else
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# error "Number of bits not supported"
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#endif
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#if STR71X_UART_PARITY == 0 || STR71X_UART_PARITY == 2
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# define STR71X_UARTCR_PARITY (0)
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#elif STR71X_UART_PARITY == 1
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# define STR71X_UARTCR_PARITY STR71X_UARTCR_PARITYODD
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#else
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# error "Invalid parity selection"
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#endif
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#if STR71X_UART_2STOP != 0
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# define STR71X_UARTCR_STOP STR71X_UARTCR_STOPBIT20
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#else
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# define STR71X_UARTCR_STOP STR71X_UARTCR_STOPBIT10
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#endif
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#define STR71X_UARTCR_VALUE \
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(STR71X_UARTCR_MODE | STR71X_UARTCR_PARITY | STR71X_UARTCR_STOP | \
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STR71X_UARTCR_RUN | STR71X_UARTCR_RXENABLE | STR71X_UARTCR_FIFOENABLE)
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/* Calculate BAUD rate from PCLK1:
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*
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* Example:
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* PCLK1 = 32MHz
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* STR71X_UART_BAUD = 38,400
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* UART_BAUDRATE_DIVISOR = 614,400
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* UART_BAUDRATE = 52.583 (exact) or 52 truncated (1.1% error)
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*/
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#define UART_BAUDDIVISOR (16 * STR71X_UART_BAUD)
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#define UART_BAUDRATE ((STR71X_PCLK1 + (UART_BAUDDIVISOR/2)) / UART_BAUDDIVISOR)
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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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#ifdef HAVE_CONSOLE
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/* Wait until the TX FIFO is not full */
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while ((getreg16(STR71X_UART_SR(STR71X_UART_BASE)) &
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STR71X_UARTSR_TF) != 0);
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/* Then send the character */
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putreg16((uint16_t)ch, STR71X_UART_TXBUFR(STR71X_UART_BASE));
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#endif
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}
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/****************************************************************************
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* Name: up_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 up_lowsetup(void)
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{
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#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
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uint16_t reg16;
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/* Enable the selected console device */
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/* Set the UART baud rate */
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putreg16((uint16_t)UART_BAUDRATE, STR71X_UART_BR(STR71X_UART_BASE));
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/* Configure the UART control registers */
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putreg16(STR71X_UARTCR_VALUE, STR71X_UART_CR(STR71X_UART_BASE));
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/* Clear FIFOs */
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putreg16(0, STR71X_UART_TXRSTR(STR71X_UART_BASE));
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putreg16(0, STR71X_UART_RXRSTR(STR71X_UART_BASE));
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#endif
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/* Configure GPIO0 pins to enable all UARTs in the configuration
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* (the serial driver later depends on this configuration)
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*/
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#ifdef HAVE_UART
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reg16 = getreg16(STR71X_GPIO0_PC0);
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reg16 &= ~STR71X_UART_GPIO0_MASK;
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reg16 |= STR71X_UART_GPIO0_PC0BITS;
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putreg16(reg16, STR71X_GPIO0_PC0);
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reg16 = getreg16(STR71X_GPIO0_PC1);
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reg16 &= ~STR71X_UART_GPIO0_MASK;
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reg16 |= STR71X_UART_GPIO0_PC1BITS;
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putreg16(reg16, STR71X_GPIO0_PC1);
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reg16 = getreg16(STR71X_GPIO0_PC2);
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reg16 &= ~STR71X_UART_GPIO0_MASK;
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reg16 |= STR71X_UART_GPIO0_PC2BITS;
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putreg16(reg16, STR71X_GPIO0_PC2);
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#endif
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}
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