From cff706e3ca3823ffb388a4e87c4ef8bf925945c4 Mon Sep 17 00:00:00 2001 From: Fergus Noble Date: Thu, 15 Sep 2011 01:20:45 -0700 Subject: Rename F1 examples folder. --- examples/stm32f1/other/rtc/Makefile | 23 +++++++ examples/stm32f1/other/rtc/README | 6 ++ examples/stm32f1/other/rtc/rtc.c | 116 ++++++++++++++++++++++++++++++++++++ examples/stm32f1/other/rtc/rtc.ld | 31 ++++++++++ 4 files changed, 176 insertions(+) create mode 100644 examples/stm32f1/other/rtc/Makefile create mode 100644 examples/stm32f1/other/rtc/README create mode 100644 examples/stm32f1/other/rtc/rtc.c create mode 100644 examples/stm32f1/other/rtc/rtc.ld (limited to 'examples/stm32f1/other/rtc') diff --git a/examples/stm32f1/other/rtc/Makefile b/examples/stm32f1/other/rtc/Makefile new file mode 100644 index 0000000..1efa7ac --- /dev/null +++ b/examples/stm32f1/other/rtc/Makefile @@ -0,0 +1,23 @@ +## +## This file is part of the libopencm3 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 = rtc + +include ../../Makefile.include + diff --git a/examples/stm32f1/other/rtc/README b/examples/stm32f1/other/rtc/README new file mode 100644 index 0000000..f1e3975 --- /dev/null +++ b/examples/stm32f1/other/rtc/README @@ -0,0 +1,6 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This is a small RTC example project. + diff --git a/examples/stm32f1/other/rtc/rtc.c b/examples/stm32f1/other/rtc/rtc.c new file mode 100644 index 0000000..c447534 --- /dev/null +++ b/examples/stm32f1/other/rtc/rtc.c @@ -0,0 +1,116 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2010 Lord James + * + * 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 +#include +#include +#include + +void clock_setup(void) +{ + rcc_clock_setup_in_hse_8mhz_out_72mhz(); + + /* Enable GPIOC clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); + + /* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN); + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN); +} + +void usart_setup(void) +{ + /* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */ + gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX); + + /* Setup UART parameters. */ + usart_set_baudrate(USART1, 38400); + 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(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO12); +} + +void nvic_setup(void) +{ + /* Without this the RTC interrupt routine will never be called. */ + nvic_enable_irq(NVIC_RTC_IRQ); + nvic_set_priority(NVIC_RTC_IRQ, 1); +} + +void rtc_isr(void) +{ + volatile u32 j = 0, c = 0; + + /* The interrupt flag isn't cleared by hardware, we have to do it. */ + rtc_clear_flag(RTC_SEC); + + /* Visual output. */ + gpio_toggle(GPIOC, GPIO12); + + c = rtc_get_counter_val(); + + /* Display the current counter value in binary via USART1. */ + for (j = 0; j < 32; j++) { + if ((c & (0x80000000 >> j)) != 0) { + usart_send(USART1, '1'); + } else { + usart_send(USART1, '0'); + } + } + usart_send(USART1, '\n'); +} + +int main(void) +{ + clock_setup(); + gpio_setup(); + usart_setup(); + + /* + * If the RTC is pre-configured just allow access, don't reconfigure. + * Otherwise enable it with the LSE as clock source and 0x7fff as + * prescale value. + */ + rtc_auto_awake(LSE, 0x7fff); + + /* Setup the RTC interrupt. */ + nvic_setup(); + + /* Enable the RTC interrupt to occur off the SEC flag. */ + rtc_interrupt_enable(RTC_SEC); + + while(1); + + return 0; +} diff --git a/examples/stm32f1/other/rtc/rtc.ld b/examples/stm32f1/other/rtc/rtc.ld new file mode 100644 index 0000000..7ea2b92 --- /dev/null +++ b/examples/stm32f1/other/rtc/rtc.ld @@ -0,0 +1,31 @@ +/* + * This file is part of the libopencm3 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 Olimex STM32-H103 (STM32F103RBT6, 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. */ +INCLUDE libopencm3_stm32.ld + -- cgit v1.2.3