diff --git a/examples/obldc/Makefile b/examples/obldc/Makefile index 991178c0..88182d5e 100644 --- a/examples/obldc/Makefile +++ b/examples/obldc/Makefile @@ -24,7 +24,7 @@ Q := @ MAKEFLAGS += --no-print-directory endif -all: led systick +all: led systick usart led: @printf " BUILD examples/obldc/led\n" @@ -34,11 +34,17 @@ systick: @printf " BUILD examples/obldc/systick\n" $(Q)$(MAKE) -C systick +usart: + @printf " BUILD examples/obldc/usart\n" + $(Q)$(MAKE) -C usart + clean: @printf " CLEAN examples/obldc/led\n" $(Q)$(MAKE) -C led clean @printf " CLEAN examples/obldc/systick\n" $(Q)$(MAKE) -C systick clean + @printf " CLEAN examples/obldc/usart\n" + $(Q)$(MAKE) -C usart clean -.PHONY: led systick +.PHONY: led systick usart diff --git a/examples/obldc/usart/Makefile b/examples/obldc/usart/Makefile new file mode 100644 index 00000000..6484117a --- /dev/null +++ b/examples/obldc/usart/Makefile @@ -0,0 +1,22 @@ +## +## This file is part of the libopenstm32 project. +## +## Copyright (C) 2009 Uwe Hermann +## +## This program is free software: you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation, either version 3 of the License, or +## (at your option) any later version. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program. If not, see . +## + +BINARY = usart + +include ../../Makefile.include diff --git a/examples/obldc/usart/usart.c b/examples/obldc/usart/usart.c new file mode 100644 index 00000000..ac0becb0 --- /dev/null +++ b/examples/obldc/usart/usart.c @@ -0,0 +1,91 @@ +/* + * This file is part of the libopenstm32 project. + * + * Copyright (C) 2009 Uwe Hermann + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include + +void clock_setup(void) +{ + rcc_clock_setup_in_hse_8mhz_out_72mhz(); + + /* Enable GPIOA clock. For LED gpio's */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN); + + /* Enable clocks for GPIO port B (for GPIO_USART1_TX) and USART1. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN); + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN); + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN); +} + +void usart_setup(void) +{ + + /* Setup GPIO6 (in GPIO port A) to 'output push-pull' for led use. */ + gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, + GPIO6); + + AFIO_MAPR |= AFIO_MAPR_USART1_REMAP; + + /* Setup GPIO pin GPIO_USART3_TX/GPIO10 on GPIO port B for transmit. */ + gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_RE_TX); + + /* Setup UART parameters. */ + usart_set_baudrate(USART1, 230400); + usart_set_databits(USART1, 8); + usart_set_stopbits(USART1, USART_STOPBITS_1); + usart_set_mode(USART1, USART_MODE_TX); + usart_set_parity(USART1, USART_PARITY_NONE); + usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE); + + /* Finally enable the USART. */ + usart_enable(USART1); +} + +void gpio_setup(void) +{ + /* Set GPIO12 (in GPIO port C) to 'output push-pull'. */ + gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO6); +} + +int main(void) +{ + int i, j = 0, c = 0; + + clock_setup(); + gpio_setup(); + usart_setup(); + + /* Blink the LED (PC12) on the board with every transmitted byte. */ + while (1) { + gpio_toggle(GPIOA, GPIO6); /* LED on/off */ + usart_send(USART1, c + '0'); /* Send one byte on USART3. */ + c = (c == 9) ? 0 : c + 1; /* Increment c. */ + if ((j++ % 80) == 0) { /* Newline after line full. */ + usart_send(USART1, '\r'); + usart_send(USART1, '\n'); + } + for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */ + } + + return 0; +} diff --git a/examples/obldc/usart/usart.ld b/examples/obldc/usart/usart.ld new file mode 100644 index 00000000..c8683d5e --- /dev/null +++ b/examples/obldc/usart/usart.ld @@ -0,0 +1,31 @@ +/* + * This file is part of the libopenstm32 project. + * + * Copyright (C) 2009 Uwe Hermann + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +/* Linker script for Open-BLDC (STM32F103CBT6, 128K flash, 20K RAM). */ + +/* Define memory regions. */ +MEMORY +{ + rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K + ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K +} + +/* Include the common ld script from libopenstm32. */ +INCLUDE libopenstm32.ld +