diff --git a/examples/stm32/Makefile b/examples/stm32/Makefile index da49aa8b..6a218fc9 100644 --- a/examples/stm32/Makefile +++ b/examples/stm32/Makefile @@ -24,7 +24,11 @@ Q := @ MAKEFLAGS += --no-print-directory endif -all: stm32-h103 stm32-h107 mb525 lisa-m obldc other +all: stm32-discovery stm32-h103 stm32-h107 mb525 lisa-m obldc other + +stm32-discovery: + @printf " BUILD examples/stm32/stm32-discovery\n" + $(Q)$(MAKE) -C stm32-discovery stm32-h103: @printf " BUILD examples/stm32/stm32-h103\n" @@ -51,6 +55,8 @@ obldc: $(Q)$(MAKE) -C obldc clean: + @printf " CLEAN examples/stm32/stm32-discovery\n" + $(Q)$(MAKE) -C stm32-discovery clean @printf " CLEAN examples/stm32/stm32-h103\n" $(Q)$(MAKE) -C stm32-h103 clean @printf " CLEAN examples/stm32/stm32-h107\n" @@ -64,5 +70,5 @@ clean: @printf " CLEAN examples/stm32/obldc\n" $(Q)$(MAKE) -C obldc clean -.PHONY: stm32-h103 stm32-h107 mb525 lisa-m other obldc clean +.PHONY: stm32-discovery stm32-h103 stm32-h107 mb525 lisa-m other obldc clean diff --git a/examples/stm32/stm32-discovery/Makefile b/examples/stm32/stm32-discovery/Makefile new file mode 100644 index 00000000..bbf96d80 --- /dev/null +++ b/examples/stm32/stm32-discovery/Makefile @@ -0,0 +1,62 @@ +## +## 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 . +## + +# Be silent per default, but 'make V=1' will show all compiler calls. +ifneq ($(V),1) +Q := @ +# Do not print "Entering directory ...". +MAKEFLAGS += --no-print-directory +endif + +all: miniblink fancyblink usart button rtc + +miniblink: + @printf " BUILD examples/stm32/stm32-discovery/miniblink\n" + $(Q)$(MAKE) -C miniblink + +fancyblink: + @printf " BUILD examples/stm32/stm32-discovery/fancyblink\n" + $(Q)$(MAKE) -C fancyblink + +usart: + @printf " BUILD examples/stm32/stm32-discovery/usart\n" + $(Q)$(MAKE) -C usart + +button: + @printf " BUILD examples/stm32/stm32-discovery/button\n" + $(Q)$(MAKE) -C button + +rtc: + @printf " BUILD examples/stm32/stm32-discovery/rtc\n" + $(Q)$(MAKE) -C rtc + +clean: + @printf " CLEAN examples/stm32/stm32-discovery/miniblink\n" + $(Q)$(MAKE) -C miniblink clean + @printf " CLEAN examples/stm32/stm32-discovery/fancyblink\n" + $(Q)$(MAKE) -C fancyblink clean + @printf " CLEAN examples/stm32/stm32-discovery/usart\n" + $(Q)$(MAKE) -C usart clean + @printf " CLEAN examples/stm32/stm32-discovery/button\n" + $(Q)$(MAKE) -C button clean + @printf " CLEAN examples/stm32/stm32-discovery/rtc\n" + $(Q)$(MAKE) -C rtc clean + +.PHONY: miniblink fancyblink usart button rtc clean + diff --git a/examples/stm32/stm32-discovery/button/Makefile b/examples/stm32/stm32-discovery/button/Makefile new file mode 100644 index 00000000..96731c22 --- /dev/null +++ b/examples/stm32/stm32-discovery/button/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 = button + +include ../../Makefile.include + diff --git a/examples/stm32/stm32-discovery/button/README b/examples/stm32/stm32-discovery/button/README new file mode 100644 index 00000000..3e634d7d --- /dev/null +++ b/examples/stm32/stm32-discovery/button/README @@ -0,0 +1,6 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This example blinks the green LED on the discovery. +When you press the 'USER' button, the blinking is slower. diff --git a/examples/stm32/stm32-discovery/button/button.c b/examples/stm32/stm32-discovery/button/button.c new file mode 100644 index 00000000..086d850e --- /dev/null +++ b/examples/stm32/stm32-discovery/button/button.c @@ -0,0 +1,75 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2009 Uwe Hermann , + * Copyright (C) 2010 Piotr Esden-Tempski + * + * 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 + +u16 exti_line_state; + +/* Set STM32 to 24 MHz. */ +void clock_setup(void) +{ + rcc_clock_setup_in_hse_8mhz_out_24mhz(); +} + +void gpio_setup(void) +{ + /* Enable GPIOC clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); + + /* Set GPIO9 (in GPIO port C) to 'output push-pull'. */ + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO9); +} + +void button_setup(void) +{ + /* Enable GPIOA clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN); + + /* Set GPIO0 (in GPIO port A) to 'input open-drain'. */ + gpio_set_mode(GPIOA, GPIO_MODE_INPUT, + GPIO_CNF_INPUT_FLOAT, GPIO0); +} + +int main(void) +{ + int i; + + clock_setup(); + gpio_setup(); + button_setup(); + + /* Blink the LED (PC9) on the board. */ + while (1) { + gpio_toggle(GPIOC, GPIO9); + + exti_line_state = GPIOA_IDR; + if ((exti_line_state & (1 << 0)) != 0) { + for (i = 0; i < 800000; i++) /* Wait a bit. */ + __asm__("nop"); + } + + for (i = 0; i < 800000; i++) /* Wait a bit. */ + __asm__("nop"); + } + + return 0; +} diff --git a/examples/stm32/stm32-discovery/button/button.ld b/examples/stm32/stm32-discovery/button/button.ld new file mode 100644 index 00000000..a29d0288 --- /dev/null +++ b/examples/stm32/stm32-discovery/button/button.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 = 8K +} + +/* Include the common ld script. */ +INCLUDE libopencm3_stm32.ld + diff --git a/examples/stm32/stm32-discovery/fancyblink/Makefile b/examples/stm32/stm32-discovery/fancyblink/Makefile new file mode 100644 index 00000000..1baec4de --- /dev/null +++ b/examples/stm32/stm32-discovery/fancyblink/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 = fancyblink + +include ../../Makefile.include + diff --git a/examples/stm32/stm32-discovery/fancyblink/README b/examples/stm32/stm32-discovery/fancyblink/README new file mode 100644 index 00000000..3e09f9b5 --- /dev/null +++ b/examples/stm32/stm32-discovery/fancyblink/README @@ -0,0 +1,8 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This is the smallest-possible example program using libopencm3. + +It's intended for the STM32 Discovery eval board. It should blink +the LEDs on the board. diff --git a/examples/stm32/stm32-discovery/fancyblink/fancyblink.c b/examples/stm32/stm32-discovery/fancyblink/fancyblink.c new file mode 100644 index 00000000..afe90417 --- /dev/null +++ b/examples/stm32/stm32-discovery/fancyblink/fancyblink.c @@ -0,0 +1,61 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2009 Uwe Hermann + * Copyright (C) 2011 Damjan Marion + * Copyright (C) 2011 Mark Panajotovic + * + * 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 + +/* Set STM32 to 24 MHz. */ +void clock_setup(void) +{ + rcc_clock_setup_in_hse_8mhz_out_24mhz(); + + /* Enable GPIOC clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); +} + +void gpio_setup(void) +{ + /* Set GPIO6/7 (in GPIO port C) to 'output push-pull'. */ + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO8); + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO9); +} + +int main(void) +{ + int i; + + clock_setup(); + gpio_setup(); + + /* Set one LED for wigwag effect when toggling. */ + gpio_set(GPIOC, GPIO8); + + /* Blink the LEDs (PC6 and PC7) on the board. */ + while (1) { + gpio_toggle(GPIOC, GPIO8 | GPIO9); /* Toggle LEDs. */ + for (i = 0; i < 2000000; i++) /* Wait a bit. */ + __asm__("nop"); + } + + return 0; +} diff --git a/examples/stm32/stm32-discovery/fancyblink/fancyblink.ld b/examples/stm32/stm32-discovery/fancyblink/fancyblink.ld new file mode 100644 index 00000000..a29d0288 --- /dev/null +++ b/examples/stm32/stm32-discovery/fancyblink/fancyblink.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 = 8K +} + +/* Include the common ld script. */ +INCLUDE libopencm3_stm32.ld + diff --git a/examples/stm32/stm32-discovery/miniblink/Makefile b/examples/stm32/stm32-discovery/miniblink/Makefile new file mode 100644 index 00000000..24a478b4 --- /dev/null +++ b/examples/stm32/stm32-discovery/miniblink/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 = miniblink + +include ../../Makefile.include + diff --git a/examples/stm32/stm32-discovery/miniblink/README b/examples/stm32/stm32-discovery/miniblink/README new file mode 100644 index 00000000..e4fce07e --- /dev/null +++ b/examples/stm32/stm32-discovery/miniblink/README @@ -0,0 +1,9 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This is the smallest-possible example program using libopencm3. + +It's intended for the STM32 Discovery eval board. It should blink +the blue LED on the board. + diff --git a/examples/stm32/stm32-discovery/miniblink/miniblink.c b/examples/stm32/stm32-discovery/miniblink/miniblink.c new file mode 100644 index 00000000..1992e880 --- /dev/null +++ b/examples/stm32/stm32-discovery/miniblink/miniblink.c @@ -0,0 +1,71 @@ +/* + * 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 . + */ + +#include +#include + +void gpio_setup(void) +{ + /* Enable GPIOC clock. */ + /* Manually: */ + // RCC_APB2ENR |= RCC_APB2ENR_IOPCEN; + /* Using API functions: */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); + + /* Set GPIO12 (in GPIO port C) to 'output push-pull'. */ + /* Manually: */ + // GPIOC_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((8 - 8) * 4) + 2)); + // GPIOC_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((8 - 8) * 4)); + /* Using API functions: */ + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO8); +} + +int main(void) +{ + int i; + + gpio_setup(); + + /* Blink the LED (PC8) on the board. */ + while (1) { + /* Manually: */ + // GPIOC_BSRR = GPIO8; /* LED off */ + // for (i = 0; i < 800000; i++) /* Wait a bit. */ + // __asm__("nop"); + // GPIOC_BRR = GPIO8; /* LED on */ + // for (i = 0; i < 800000; i++) /* Wait a bit. */ + // __asm__("nop"); + + /* Using API functions gpio_set()/gpio_clear(): */ + // gpio_set(GPIOC, GPIO8); /* LED off */ + // for (i = 0; i < 800000; i++) /* Wait a bit. */ + // __asm__("nop"); + // gpio_clear(GPIOC, GPIO8); /* LED on */ + // for (i = 0; i < 800000; i++) /* Wait a bit. */ + // __asm__("nop"); + + /* Using API function gpio_toggle(): */ + gpio_toggle(GPIOC, GPIO8); /* LED on/off */ + for (i = 0; i < 800000; i++) /* Wait a bit. */ + __asm__("nop"); + } + + return 0; +} diff --git a/examples/stm32/stm32-discovery/miniblink/miniblink.ld b/examples/stm32/stm32-discovery/miniblink/miniblink.ld new file mode 100644 index 00000000..a29d0288 --- /dev/null +++ b/examples/stm32/stm32-discovery/miniblink/miniblink.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 = 8K +} + +/* Include the common ld script. */ +INCLUDE libopencm3_stm32.ld + diff --git a/examples/stm32/stm32-discovery/rtc/Makefile b/examples/stm32/stm32-discovery/rtc/Makefile new file mode 100644 index 00000000..1efa7ac2 --- /dev/null +++ b/examples/stm32/stm32-discovery/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/stm32/stm32-discovery/rtc/README b/examples/stm32/stm32-discovery/rtc/README new file mode 100644 index 00000000..ee39feaa --- /dev/null +++ b/examples/stm32/stm32-discovery/rtc/README @@ -0,0 +1,8 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This is a small RTC example project. +It blinks the Discovery's blue LED at 1Hz, and sends the value of the +RTC counter register down the serial line (PA9) at 38400,8N1. + diff --git a/examples/stm32/stm32-discovery/rtc/rtc.c b/examples/stm32/stm32-discovery/rtc/rtc.c new file mode 100644 index 00000000..6e599c0b --- /dev/null +++ b/examples/stm32/stm32-discovery/rtc/rtc.c @@ -0,0 +1,129 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2010 Lord James + * Copyright (C) 2011 Mark Panajotovic + * + * 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_24mhz(); + + /* 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); + /* TODO usart_set_baudrate() doesn't support 24MHz clock (yet). */ + /* This is the equivalent: */ + USART_BRR(USART1) = (u16)((24000000 << 4) / (38400 * 16)); + + 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 GPIO8 (in GPIO port C) to 'output push-pull'. */ + /* This drives the blue LED on the discovery. */ + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO8); +} + +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, GPIO8); + + 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_blocking(USART1, '1'); + else + usart_send_blocking(USART1, '0'); + } + usart_send_blocking(USART1, '\n'); + usart_send_blocking(USART1, '\r'); +} + +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); + + /* The above mode will not reset the RTC when you press the RST button. + * It will also continue to count while the MCU is held in reset. If + * you want it to reset, comment out the above and use the following: + */ + // rtc_awake_from_off(LSE); + // rtc_set_prescale_val(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/stm32/stm32-discovery/rtc/rtc.ld b/examples/stm32/stm32-discovery/rtc/rtc.ld new file mode 100644 index 00000000..a29d0288 --- /dev/null +++ b/examples/stm32/stm32-discovery/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 = 8K +} + +/* Include the common ld script. */ +INCLUDE libopencm3_stm32.ld + diff --git a/examples/stm32/stm32-discovery/usart/Makefile b/examples/stm32/stm32-discovery/usart/Makefile new file mode 100644 index 00000000..2c1e1b1b --- /dev/null +++ b/examples/stm32/stm32-discovery/usart/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 = usart + +include ../../Makefile.include + diff --git a/examples/stm32/stm32-discovery/usart/README b/examples/stm32/stm32-discovery/usart/README new file mode 100644 index 00000000..f819b83e --- /dev/null +++ b/examples/stm32/stm32-discovery/usart/README @@ -0,0 +1,12 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This example program sends some characters on USART1 on the ST STM32 Discovery +eval board. + +The terminal settings for the receiving device/PC are 38400 8n1. + +The sending is done in a blocking way in the code, see the usart_irq example +for a more elaborate USART example. + diff --git a/examples/stm32/stm32-discovery/usart/usart.c b/examples/stm32/stm32-discovery/usart/usart.c new file mode 100644 index 00000000..05d03124 --- /dev/null +++ b/examples/stm32/stm32-discovery/usart/usart.c @@ -0,0 +1,87 @@ +/* + * 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 . + */ + +#include +#include +#include + +void clock_setup(void) +{ + rcc_clock_setup_in_hse_8mhz_out_24mhz(); + + /* 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); + /* TODO usart_set_baudrate() doesn't support 24MHz clock (yet). */ + /* This is the equivalent: */ + USART_BRR(USART1) = (u16)((24000000 << 4) / (38400 * 16)); + + 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 GPIO9 (in GPIO port C) to 'output push-pull'. [LED] */ + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO9); +} + +int main(void) +{ + int i, j = 0, c = 0; + + clock_setup(); + gpio_setup(); + usart_setup(); + + /* Blink the LED (PC9) on the board with every transmitted byte. */ + while (1) { + gpio_toggle(GPIOC, GPIO9); /* LED on/off */ + usart_send_blocking(USART1, c + '0'); /* USART1: Send byte. */ + c = (c == 9) ? 0 : c + 1; /* Increment c. */ + if ((j++ % 80) == 0) { /* Newline after line full. */ + usart_send_blocking(USART1, '\r'); + usart_send_blocking(USART1, '\n'); + } + for (i = 0; i < 800000; i++) /* Wait a bit. */ + __asm__("NOP"); + } + + return 0; +} diff --git a/examples/stm32/stm32-discovery/usart/usart.ld b/examples/stm32/stm32-discovery/usart/usart.ld new file mode 100644 index 00000000..a29d0288 --- /dev/null +++ b/examples/stm32/stm32-discovery/usart/usart.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 = 8K +} + +/* Include the common ld script. */ +INCLUDE libopencm3_stm32.ld +