From 51f196d5191f0c9a47f2642af5b7b1871c02a0fa Mon Sep 17 00:00:00 2001 From: patacongo Date: Fri, 31 Oct 2008 22:39:11 +0000 Subject: Add STR71x serial driver git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1110 42af7a65-404d-4744-a932-0658087f49c3 --- nuttx/arch/arm/src/str71x/str71x_lowputc.c | 334 +++++++++++++++++++++++++++++ 1 file changed, 334 insertions(+) create mode 100644 nuttx/arch/arm/src/str71x/str71x_lowputc.c (limited to 'nuttx/arch/arm/src/str71x/str71x_lowputc.c') diff --git a/nuttx/arch/arm/src/str71x/str71x_lowputc.c b/nuttx/arch/arm/src/str71x/str71x_lowputc.c new file mode 100644 index 000000000..02d8d9350 --- /dev/null +++ b/nuttx/arch/arm/src/str71x/str71x_lowputc.c @@ -0,0 +1,334 @@ +/************************************************************************** + * arch/arm/src/str71x/str71x_lowputc.c + * + * Copyright (C) 2008 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 "up_internal.h" +#include "up_arch.h" +#include "chp.h" + +/************************************************************************** + * Private Definitions + **************************************************************************/ + +/* Configuration **********************************************************/ + +/* Is there a UART enabled? */ + +#if defined(CONFIG_STR71X_UART0) || defined(CONFIG_STR71X_UART1) || \ + defined(CONFIG_STR71X_UART2) || defined(CONFIG_STR71X_UART3)) +# define HAVE_UART 1 + +/* Is there a serial console? */ + +# if defined(CONFIG_UART0_SERIAL_CONSOLE) || defined(CONFIG_UART1_SERIAL_CONSOLE) ||\ + defined(CONFIG_UART2_SERIAL_CONSOLE) || defined(CONFIG_UART3_SERIAL_CONSOLE) +# define HAVE_CONSOLE +# else +# undef HAVE_CONSOLE +# endif + +#else +# undef HAVE_UART +# undef HAVE_CONSOLE +#endif + +/* GPIO0 UART configuration bits */ + +#if CONFIG_STR71X_UART0 +# define STR71X_UART0_GPIO0_MASK (0x0300) /* P0.8->U0.TX, B0.9->U0.RX */ +# define STR71X_UART0_GPIO0_PC0BITS (0x0300) +# define STR71X_UART0_GPIO0_PC1BITS (0x0200) +# define STR71X_UART0_GPIO0_PC2BITS (0x0200) +#else +# define STR71X_UART0_GPIO0_MASK (0) +# define STR71X_UART0_GPIO0_PC0BITS (0) +# define STR71X_UART0_GPIO0_PC1BITS (0) +# define STR71X_UART0_GPIO0_PC2BITS (0) +#endif + +#if CONFIG_STR71X_UART0 +# define STR71X_UART1_GPIO0_MASK (0x0c00) /* P0,10->U1.RX, P0.11->U1.TX */ +# define STR71X_UART1_GPIO0_PC0BITS (0x0c00) +# define STR71X_UART1_GPIO0_PC1BITS (0x0800) +# define STR71X_UART1_GPIO0_PC2BITS (0x0800) +#else +# define STR71X_UART1_GPIO0_MASK (0) +# define STR71X_UART1_GPIO0_PC0BITS (0) +# define STR71X_UART1_GPIO0_PC1BITS (0) +# define STR71X_UART1_GPIO0_PC2BITS (0) +#endif + +#if CONFIG_STR71X_UART0 +# define STR71X_UART2_GPIO0_MASK (0x6000) /* P0.13->U2.RX, P0.14>U2.TX */ +# define STR71X_UART2_GPIO0_PC0BITS (0x6000) +# define STR71X_UART2_GPIO0_PC1BITS (0x4000) +# define STR71X_UART2_GPIO0_PC2BITS (0x4000) +#else +# define STR71X_UART2_GPIO0_MASK (0) +# define STR71X_UART2_GPIO0_PC0BITS (0) +# define STR71X_UART2_GPIO0_PC1BITS (0) +# define STR71X_UART2_GPIO0_PC2BITS (0) +#endif + +#if CONFIG_STR71X_UART0 +# define STR71X_UART3_GPIO0_MASK (0x0003) /* P0.0->U3.TX, P0.1->U3.RX */ +# define STR71X_UART3_GPIO0_PC0BITS (0x0003) +# define STR71X_UART3_GPIO0_PC1BITS (0x0001) +# define STR71X_UART3_GPIO0_PC2BITS (0x0001) +#else +# define STR71X_UART3_GPIO0_MASK (0) +# define STR71X_UART3_GPIO0_PC0BITS (0) +# define STR71X_UART3_GPIO0_PC1BITS (0) +# define STR71X_UART3_GPIO0_PC2BITS (0) +#endif + +#define STR71X_UART_GPIO0_MASK (STR71X_UART0_GPIO0_MASK |STR71X_UART1_GPIO0_MASK|\ + STR71X_UART2_GPIO0_MASK |STR71X_UART3_GPIO0_MASK) +#define STR71X_UART_GPIO0_PC0BITS (STR71X_UART0_GPIO0_PC0BITS|STR71X_UART1_GPIO0_PC0BITS|\ + STR71X_UART2_GPIO0_PC0BITS|STR71X_UART3_GPIO0_PC0BITS) +#define STR71X_UART_GPIO0_PC1BITS (STR71X_UART0_GPIO0_PC0BITS|STR71X_UART1_GPIO0_PC0BITS|\ + STR71X_UART2_GPIO0_PC0BITS|STR71X_UART3_GPIO0_PC0BITS) +#define STR71X_UART_GPIO0_PC2BITS (STR71X_UART0_GPIO0_PC0BITS|STR71X_UART1_GPIO0_PC0BITS|\ + STR71X_UART2_GPIO0_PC0BITS|STR71X_UART3_GPIO0_PC0BITS) + +/* Select UART parameters for the selected console */ + +#if defined(CONFIG_UART0_SERIAL_CONSOLE) +# define STR71X_UART_BASE STR71X_UART0_BASE +# define STR71X_UART_BAUD CONFIG_UART0_BAUD +# define STR71X_UART_BITS CONFIG_UART0_BITS +# define STR71X_UART_PARITY CONFIG_UART0_PARITY +# define STR71X_UART_2STOP CONFIG_UART0_2STOP +#elif defined(CONFIG_UART1_SERIAL_CONSOLE) +# define STR71X_UART_BASE STR71X_UART1_BASE +# define STR71X_UART_BAUD CONFIG_UART1_BAUD +# define STR71X_UART_BITS CONFIG_UART1_BITS +# define STR71X_UART_PARITY CONFIG_UART1_PARITY +# define STR71X_UART_2STOP CONFIG_UART1_2STOP +#elif defined(CONFIG_UART2_SERIAL_CONSOLE) +# define STR71X_UART_BASE STR71X_UART2_BASE +# define STR71X_UART_BAUD CONFIG_UART2_BAUD +# define STR71X_UART_BITS CONFIG_UART2_BITS +# define STR71X_UART_PARITY CONFIG_UART2_PARITY +# define STR71X_UART_2STOP CONFIG_UART2_2STOP +#elif defined(CONFIG_UART3_SERIAL_CONSOLE) +# define STR71X_UART_BASE STR71X_UART3_BASE +# define STR71X_UART_BAUD CONFIG_UART3_BAUD +# define STR71X_UART_BITS CONFIG_UART3_BITS +# define STR71X_UART_PARITY CONFIG_UART3_PARITY +# define STR71X_UART_2STOP CONFIG_UART3_2STOP +#else +# error "No CONFIG_UARTn_SERIAL_CONSOLE Setting" +#endif + +/* Get mode setting */ + +#if STR71X_UART_BITS == 7 +# if STR71X_UART_PARITY == 0 +# error "7-bits, no parity mode not supported" +# else +# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE7BITP +# endif +#elif STR71X_UART_BITS == 8 +# if STR71X_UART_PARITY == 0 +# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE8BIT +# else +# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE8BITP +# endif +#elif STR71X_UART_BITS == 9 +# if STR71X_UART_PARITY == 0 +# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE9BIT +# else +# error "9-bits with parity not supported" +# endif +#else +# error "Number of bits not supported" +#endif + +#if STR71X_UART_PARITY == 0 || STR71X_UART_PARITY == 2 +# define STR71X_UARTCR_PARITY (0) +#elif STR71X_UART_PARITY == 1 +# define STR71X_UARTCR_PARITY STR71X_UARTCR_PARITYODD +#else +# error "Invalid parity selection" +#endif + +#if STR71X_UART_2STOP != 0 +# define STR71X_UARTCR_STOP STR71X_UARTCR_STOPBIT20 +#else +# define STR71X_UARTCR_STOP STR71X_UARTCR_STOPBIT05 +#endif + +#define STR71X_UARTCR_VALUE (STR71X_UARTCR_MODE|STR71X_UARTCR_PARITY|STR71X_UARTCR_STOP|\ + STR71X_UARTCR_RUN|STR71X_UARTCR_RXENABLE|STR71X_UARTCR_FIFOENABLE) + +/* Calculate the value of PCLK1 from settings in board.h. + * + * Example: + * STR71X_RCCU_MAIN_OSC = 4MHz (not divided by 2) + * CLK2 = 4MHz + * PLL1OUT = 16 * CLK2 / 2 = 32MHz + * CLK3 = 32MHz + * RCLK = 32MHz + * PCLK1 = 32MHz / 1 = 32MHz + */ + +#ifdef STR71X_PLL1IN_DIV2 /* Input may be divided by 2 */ +# define CLK2 (STR71X_RCCU_MAIN_OSC/2) /* CLK2 is input to PLL1 */ +#else +# define CLK2 STR71X_RCCU_MAIN_OSC /* CLK2 is input to PLL1 */ +#endif + /* PLL1OUT derives from CLK2 */ +#define PLL1OUT (STR71X_PLL1OUT_MUL * CLK2 / STR71X_PLL1OUT_DIV) +#define CLK3 PLL1OUT /* CLK3 hard coded to be PLL1OUT */ +#define RCLK CLK3 /* RCLK hard coded to be CLK3 */ +#define PCLK1 (RCLK / STR71X_APB1_DIV) /* PCLK1 derives from RCLK */ + +/* Calculate BAUD rate from PCLK1: + * + * Example: + * PCLK1 = 32MHz + * STR71X_UART_BAUD = 38,400 + * UART_BAUDRATE_DIVISOR = 614,400 + * UART_BAUDRATE = 52.583 (exact) or 52 truncated (1.1% error) + */ + +#define UART_BAUDDIVISOR (16 * STR71X_UART_BAUD) +#define UART_BAUDRATE ((PCLK1 + (UART_BAUDDIVISOR/2) / UART_BAUDDIVISOR) + +/************************************************************************** + * Private Types + **************************************************************************/ + +/************************************************************************** + * Private Function Prototypes + **************************************************************************/ + +/************************************************************************** + * Global Variables + **************************************************************************/ + +/************************************************************************** + * Private Variables + **************************************************************************/ + +/************************************************************************** + * Private Functions + **************************************************************************/ + +/************************************************************************** + * Public Functions + **************************************************************************/ + +/************************************************************************** + * Name: up_lowputc + * + * Description: + * Output one byte on the serial console + * + **************************************************************************/ + +void up_lowputc(char ch) +{ +#if HAVE_CONSOLE + uint16 reg16; + + /* Wait until the TX FIFO is not full */ + + while (getreg16(STR71X_UART_SR(STR71X_UART_BASE)) & STR71X_UARTSR_TF != 0); + + /* Then send the character */ + + putreg16((uint16)ch, STR71X_UART_TXBUFR(STR71X_UART_BASE)); +#endif +} + +/************************************************************************** + * Name: up_lowsetup + * + * Description: + * This performs basic initialization of the UART used for the serial + * console. Its purpose is to get the console output availabe as soon + * as possible. + * + **************************************************************************/ + +void up_lowsetup(void) +{ +#if HAVE_CONSOLE + uint16 reg16; + + /* Enable the selected console device */ + /* Set the UART baud rate */ + + putreg16(UART_BAUDRATE, STR71X_UART_BR(STR71X_UART_BASE)); + + /* Configure the UART control registers */ + + putreg16(STR71X_UARTCR_VALUE, STR71X_UART_CR(STR71X_UART_BASE)); + + /* Clear FIFOs */ + + putreg16(0, STR71X_UART2_TXRSTR_(STR71X_UART_BASE)); + putreg16(0, SSTR71X_UART2_RXRSTR(STR71X_UART_BASE)); +#endif + + /* Configure GPIO0 pins to enable all UARTs in the configuration + * (the serial driver later depends on this configuration) + */ + +#if HAVE_UART + reg16 = getreg16(STR71X_GPIO_PC0_OFFSET); + reg16 &= STR71X_GPIO0_MASK; + reg16 |= STR71X_GPIO0_PC0BITS; + putreg16(reg16, STR71X_GPIO_PC0_OFFSET); + + reg16 = getreg16(STR71X_GPIO_PC1_OFFSET); + reg16 &= STR71X_GPIO0_MASK; + reg16 |= STR71X_GPIO0_PC1BITS; + putreg16(reg16, STR71X_GPIO_PC1_OFFSET); + + reg16 = getreg16(STR71X_GPIO_PC2_OFFSET); + reg16 &= STR71X_GPIO0_MASK; + reg16 |= STR71X_GPIO0_PC2BITS; + putreg16(reg16, STR71X_GPIO_PC2_OFFSET); +#endif +} + + -- cgit v1.2.3