/**************************************************************************** * arch/arm/src/stm32f0l0g0/stm32_lowputc_v2.c * * Copyright (C) 2019 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 "arm_internal.h" #include "arm_arch.h" #include "chip.h" #include "hardware/stm32_pinmap.h" #include "stm32_rcc.h" #include "stm32_gpio.h" #include "stm32_uart.h" #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Select USART parameters for the selected console */ #ifdef HAVE_CONSOLE # if defined(CONFIG_USART1_SERIAL_CONSOLE) # define STM32_CONSOLE_BASE STM32_USART1_BASE # define STM32_APBCLOCK STM32_PCLK1_FREQUENCY # define STM32_CONSOLE_APBREG STM32_RCC_APB2ENR # define STM32_CONSOLE_APBEN RCC_APB2ENR_USART1EN # define STM32_CONSOLE_BAUD CONFIG_USART1_BAUD # define STM32_CONSOLE_BITS CONFIG_USART1_BITS # define STM32_CONSOLE_PARITY CONFIG_USART1_PARITY # define STM32_CONSOLE_2STOP CONFIG_USART1_2STOP # define STM32_CONSOLE_TX GPIO_USART1_TX # define STM32_CONSOLE_RX GPIO_USART1_RX # ifdef CONFIG_USART1_RS485 # define STM32_CONSOLE_RS485_DIR GPIO_USART1_RS485_DIR # if (CONFIG_USART1_RS485_DIR_POLARITY == 0) # define STM32_CONSOLE_RS485_DIR_POLARITY false # else # define STM32_CONSOLE_RS485_DIR_POLARITY true # endif # endif # elif defined(CONFIG_USART2_SERIAL_CONSOLE) # define STM32_CONSOLE_BASE STM32_USART2_BASE # define STM32_APBCLOCK STM32_PCLK1_FREQUENCY # define STM32_CONSOLE_APBREG STM32_RCC_APB1ENR # define STM32_CONSOLE_APBEN RCC_APB1ENR_USART2EN # define STM32_CONSOLE_BAUD CONFIG_USART2_BAUD # define STM32_CONSOLE_BITS CONFIG_USART2_BITS # define STM32_CONSOLE_PARITY CONFIG_USART2_PARITY # define STM32_CONSOLE_2STOP CONFIG_USART2_2STOP # define STM32_CONSOLE_TX GPIO_USART2_TX # define STM32_CONSOLE_RX GPIO_USART2_RX # ifdef CONFIG_USART2_RS485 # define STM32_CONSOLE_RS485_DIR GPIO_USART2_RS485_DIR # if (CONFIG_USART2_RS485_DIR_POLARITY == 0) # define STM32_CONSOLE_RS485_DIR_POLARITY false # else # define STM32_CONSOLE_RS485_DIR_POLARITY true # endif # endif # elif defined(CONFIG_USART3_SERIAL_CONSOLE) # define STM32_CONSOLE_BASE STM32_USART3_BASE # define STM32_APBCLOCK STM32_PCLK1_FREQUENCY # define STM32_CONSOLE_APBREG STM32_RCC_APB1ENR # define STM32_CONSOLE_APBEN RCC_APB1ENR_USART3EN # define STM32_CONSOLE_BAUD CONFIG_USART3_BAUD # define STM32_CONSOLE_BITS CONFIG_USART3_BITS # define STM32_CONSOLE_PARITY CONFIG_USART3_PARITY # define STM32_CONSOLE_2STOP CONFIG_USART3_2STOP # define STM32_CONSOLE_TX GPIO_USART3_TX # define STM32_CONSOLE_RX GPIO_USART3_RX # ifdef CONFIG_USART3_RS485 # define STM32_CONSOLE_RS485_DIR GPIO_USART3_RS485_DIR # if (CONFIG_USART3_RS485_DIR_POLARITY == 0) # define STM32_CONSOLE_RS485_DIR_POLARITY false # else # define STM32_CONSOLE_RS485_DIR_POLARITY true # endif # endif # elif defined(CONFIG_USART4_SERIAL_CONSOLE) # define STM32_CONSOLE_BASE STM32_USART4_BASE # define STM32_APBCLOCK STM32_PCLK1_FREQUENCY # define STM32_CONSOLE_APBREG STM32_RCC_APB1ENR # define STM32_CONSOLE_APBEN RCC_APB1ENR_USART4EN # define STM32_CONSOLE_BAUD CONFIG_USART4_BAUD # define STM32_CONSOLE_BITS CONFIG_USART4_BITS # define STM32_CONSOLE_PARITY CONFIG_USART4_PARITY # define STM32_CONSOLE_2STOP CONFIG_USART4_2STOP # define STM32_CONSOLE_TX GPIO_USART4_TX # define STM32_CONSOLE_RX GPIO_USART4_RX # ifdef CONFIG_USART4_RS485 # define STM32_CONSOLE_RS485_DIR GPIO_USART4_RS485_DIR # if (CONFIG_USART4_RS485_DIR_POLARITY == 0) # define STM32_CONSOLE_RS485_DIR_POLARITY false # else # define STM32_CONSOLE_RS485_DIR_POLARITY true # endif # endif # endif /* CR1 settings */ # if STM32_CONSOLE_BITS == 7 # define USART_CR_M01_VALUE USART_CR1_M1 # elif STM32_CONSOLE_BITS == 9 # define USART_CR_M01_VALUE USART_CR1_M0 # else /* STM32_CONSOLE_BITS == 8 */ # define USART_CR_M01_VALUE 0 # endif # if STM32_CONSOLE_PARITY == 1 # define USART_CR1_PARITY_VALUE (USART_CR1_PCE|USART_CR1_PS) # elif STM32_CONSOLE_PARITY == 2 # define USART_CR1_PARITY_VALUE USART_CR1_PCE # else # define USART_CR1_PARITY_VALUE 0 # endif # define USART_CR1_CLRBITS \ (USART_CR1_RE | USART_CR1_TE | USART_CR1_PS | USART_CR1_PCE | \ USART_CR1_WAKE | USART_CR1_M0 | USART_CR1_MME | USART_CR1_OVER8 | \ USART_CR1_DEDT_MASK | USART_CR1_DEAT_MASK | USART_CR1_ALLINTS) # define USART_CR1_SETBITS (USART_CR_M01_VALUE | USART_CR1_PARITY_VALUE) /* CR2 settings */ # if STM32_CONSOLE_2STOP != 0 # define USART_CR2_STOP2_VALUE USART_CR2_STOP2 # else # define USART_CR2_STOP2_VALUE 0 # endif # define USART_CR2_CLRBITS \ (USART_CR2_ADDM7 | USART_CR2_LBDL | USART_CR2_LBDIE | USART_CR2_LBCL | \ USART_CR2_CPHA | USART_CR2_CPOL | USART_CR2_CLKEN | USART_CR2_STOP_MASK | \ USART_CR2_LINEN | USART_CR2_RXINV | USART_CR2_TXINV | USART_CR2_DATAINV | \ USART_CR2_MSBFIRST | USART_CR2_ABREN | USART_CR2_ABRMOD_MASK | \ USART_CR2_RTOEN | USART_CR2_ADD8_MASK) # define USART_CR2_SETBITS USART_CR2_STOP2_VALUE /* CR3 settings */ # define USART_CR3_CLRBITS \ (USART_CR3_EIE | USART_CR3_IREN | USART_CR3_IRLP | USART_CR3_HDSEL | \ USART_CR3_NACK | USART_CR3_SCEN | USART_CR3_DMAR | USART_CR3_DMAT | \ USART_CR3_RTSE | USART_CR3_CTSE | USART_CR3_CTSIE | USART_CR3_ONEBIT | \ USART_CR3_OVRDIS | USART_CR3_DDRE | USART_CR3_DEM | USART_CR3_DEP | \ USART_CR3_SCARCNT_MASK) # define USART_CR3_SETBITS 0 /* Only the STM32 F3 supports oversampling by 8 */ # undef USE_OVER8 /* Calculate USART BAUD rate divider */ /* Baud rate for standard USART (SPI mode included): * * In case of oversampling by 16, the equation is: * baud = fCK / UARTDIV * UARTDIV = fCK / baud * * In case of oversampling by 8, the equation is: * * baud = 2 * fCK / UARTDIV * UARTDIV = 2 * fCK / baud */ # define STM32_USARTDIV8 \ (((STM32_APBCLOCK << 1) + (STM32_CONSOLE_BAUD >> 1)) / STM32_CONSOLE_BAUD) # define STM32_USARTDIV16 \ ((STM32_APBCLOCK + (STM32_CONSOLE_BAUD >> 1)) / STM32_CONSOLE_BAUD) /* Use oversampling by 8 only if the divisor is small. But what is small? */ # if STM32_USARTDIV8 > 100 # define STM32_BRR_VALUE STM32_USARTDIV16 # else # define USE_OVER8 1 # define STM32_BRR_VALUE \ ((STM32_USARTDIV8 & 0xfff0) | ((STM32_USARTDIV8 & 0x000f) >> 1)) # endif #endif /* HAVE_CONSOLE */ /**************************************************************************** * Private Types ****************************************************************************/ /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /**************************************************************************** * Public Data ****************************************************************************/ /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: arm_lowputc * * Description: * Output one byte on the serial console * ****************************************************************************/ void arm_lowputc(char ch) { #ifdef HAVE_CONSOLE /* Wait until the TX data register is empty */ while ((getreg32(STM32_CONSOLE_BASE + STM32_USART_ISR_OFFSET) & USART_ISR_TXE) == 0); #ifdef STM32_CONSOLE_RS485_DIR stm32_gpiowrite(STM32_CONSOLE_RS485_DIR, STM32_CONSOLE_RS485_DIR_POLARITY); #endif /* Then send the character */ putreg32((uint32_t)ch, STM32_CONSOLE_BASE + STM32_USART_TDR_OFFSET); #ifdef STM32_CONSOLE_RS485_DIR while ((getreg32(STM32_CONSOLE_BASE + STM32_USART_ISR_OFFSET) & USART_ISR_TC) == 0); stm32_gpiowrite(STM32_CONSOLE_RS485_DIR, !STM32_CONSOLE_RS485_DIR_POLARITY); #endif #endif /* HAVE_CONSOLE */ } /**************************************************************************** * Name: stm32_lowsetup * * Description: * This performs basic initialization of the USART used for the serial * console. Its purpose is to get the console output available as soon * as possible. * ****************************************************************************/ void stm32_lowsetup(void) { #if defined(HAVE_USART) #if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG) uint32_t cr; #endif #if defined(HAVE_CONSOLE) /* Enable USART APB1/2 clock */ modifyreg32(STM32_CONSOLE_APBREG, 0, STM32_CONSOLE_APBEN); #endif /* Enable the console USART and configure GPIO pins needed for rx/tx. * * NOTE: Clocking for selected U[S]ARTs was already provided in stm32_rcc.c */ #ifdef STM32_CONSOLE_TX stm32_configgpio(STM32_CONSOLE_TX); #endif #ifdef STM32_CONSOLE_RX stm32_configgpio(STM32_CONSOLE_RX); #endif #ifdef STM32_CONSOLE_RS485_DIR stm32_configgpio(STM32_CONSOLE_RS485_DIR); stm32_gpiowrite(STM32_CONSOLE_RS485_DIR, !STM32_CONSOLE_RS485_DIR_POLARITY); #endif /* Enable and configure the selected console device */ #if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG) /* Configure CR2 */ cr = getreg32(STM32_CONSOLE_BASE + STM32_USART_CR2_OFFSET); cr &= ~USART_CR2_CLRBITS; cr |= USART_CR2_SETBITS; putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR2_OFFSET); /* Configure CR1 */ cr = getreg32(STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET); cr &= ~USART_CR1_CLRBITS; cr |= USART_CR1_SETBITS; putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET); /* Configure CR3 */ cr = getreg32(STM32_CONSOLE_BASE + STM32_USART_CR3_OFFSET); cr &= ~USART_CR3_CLRBITS; cr |= USART_CR3_SETBITS; putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR3_OFFSET); /* Configure the USART Baud Rate */ putreg32(STM32_BRR_VALUE, STM32_CONSOLE_BASE + STM32_USART_BRR_OFFSET); /* Select oversampling by 8 */ cr = getreg32(STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET); #ifdef USE_OVER8 cr |= USART_CR1_OVER8; putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET); #endif /* Enable Rx, Tx and the USART */ cr |= (USART_CR1_UE | USART_CR1_TE | USART_CR1_RE); putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET); #endif /* HAVE_CONSOLE && !CONFIG_SUPPRESS_UART_CONFIG */ #endif /* HAVE_USART */ }