diff options
Diffstat (limited to 'apps/serial1')
| -rw-r--r-- | apps/serial1/CMakeLists.txt | 23 | ||||
| -rw-r--r-- | apps/serial1/serial1.cpp | 128 |
2 files changed, 151 insertions, 0 deletions
diff --git a/apps/serial1/CMakeLists.txt b/apps/serial1/CMakeLists.txt new file mode 100644 index 0000000..0491391 --- /dev/null +++ b/apps/serial1/CMakeLists.txt @@ -0,0 +1,23 @@ +add_executable(serial1.elf serial1.cpp + ${PLAYGROUND_DIR}/src/init_low.s ${PLAYGROUND_DIR}/src/init_high.cpp ${PLAYGROUND_DIR}/include/init_high.h + ${PLAYGROUND_DIR}/include/playground.h + ${PLAYGROUND_DIR}/src/debug.cpp ${PLAYGROUND_DIR}/include/debug.h + ${PLAYGROUND_DIR}/include/stm32f10x_conf.h + # http://www.sparetimelabs.com/tinyprintf/tinyprintf.php + ${TINYPRINTF_DIR}/tinyprintf.c ${TINYPRINTF_DIR}/tinyprintf.h + ${STM32F10X_STDPERIPH_LIB}/Libraries/CMSIS/CM3/CoreSupport/core_cm3.c + ${STM32F10X_STDPERIPH_LIB}/Libraries/CMSIS/CM3/DeviceSupport/ST/STM32F10x/system_stm32f10x.c + ${STM32F10X_STDPERIPH_LIB}/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_rcc.c + ${STM32F10X_STDPERIPH_LIB}/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_gpio.c + ) + +target_include_directories(serial1.elf PUBLIC + ${PLAYGROUND_DIR}/include + ${TINYPRINTF_DIR} + ${STM32F10X_STDPERIPH_LIB}/Libraries/CMSIS/CM3/CoreSupport + ${STM32F10X_STDPERIPH_LIB}/Libraries/CMSIS/CM3/DeviceSupport/ST/STM32F10x + ${STM32F10X_STDPERIPH_LIB}/Libraries/STM32F10x_StdPeriph_Driver/inc) +target_compile_definitions(serial1.elf PUBLIC ${STM32F10X_STDPERIPH_DEFINES}) + +set_target_properties(serial1.elf PROPERTIES LINK_FLAGS "-nostartfiles -T${CMAKE_SOURCE_DIR}/cmake/stm32.ld") +add_extra_commands(serial1.elf) diff --git a/apps/serial1/serial1.cpp b/apps/serial1/serial1.cpp new file mode 100644 index 0000000..60e9bc9 --- /dev/null +++ b/apps/serial1/serial1.cpp @@ -0,0 +1,128 @@ +#include <stdint.h> +#include <stm32f10x.h> +#include <stm32f10x_rcc.h> +#include <stm32f10x_gpio.h> +#include <stddef.h> +#include <stdarg.h> +#include "debug.h" +#include "tinyprintf.h" + +extern "C" void halt(); + +#include "stm32f10x_conf.h" + +extern "C" +__attribute__((naked)) +void HardFault_Handler_C(uint32_t *hardfault_args) { + halt(); +} + +size_t strlen(const char *s) { + size_t size = 0; + while (*s++ != '\0') size++; + return size; +} + +int run = 1; + +volatile USART_TypeDef *usart1 = (volatile USART_TypeDef *) USART1_BASE; + +/* + * When we get there the stack pointer is set + */ +int main() { + SystemInit(); + + init_printf(nullptr, dbg_putc); + + RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO + | RCC_APB2Periph_USART1 + | RCC_APB2Periph_GPIOA + | RCC_APB2Periph_GPIOB + | RCC_APB2Periph_GPIOC, + ENABLE); + + /* ***************************************** */ + + // Debug on port B + + RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, ENABLE); + RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, DISABLE); + + // Make Port B's pin #5 the debug output pin + GPIO_InitTypeDef init; + GPIO_StructInit(&init); + init.GPIO_Pin = GPIO_Pin_5; + init.GPIO_Mode = GPIO_Mode_Out_PP; + GPIO_Init(GPIOB, &init); + + /* ***************************************** */ + + RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, ENABLE); + RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, DISABLE); + + /* + * PA9 USART1_TX + * PA10 USART1_RX + */ + + // Enable USART1 + RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE); + RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE); + + // Make the TX pin an output + GPIO_StructInit(&init); + init.GPIO_Pin = GPIO_Pin_9; + init.GPIO_Mode = GPIO_Mode_AF_PP; + GPIO_Init(GPIOA, &init); + + // 8 bit mode + USART1->CR1 &= ~USART_CR1_M; + USART1->CR2 &= ~USART_CR2_STOP_1; + + USART1->CR1 |= USART_CR1_UE /* Set UART Enable */ + | USART_CR1_TE; /* Set Transmission Enable */ + + // Set baud rate + int mantissa = 39; + int fraction = static_cast<int>(16 * 0.0625); // == 1 + // 72M / (16*39.0625) = 115200 + USART1->BRR = static_cast<uint16_t >(mantissa << 4 | fraction); + + char c = 'A'; + while (run) { + int txe = USART1->SR & USART_SR_TXE; + +// dbg_printf("1:%d?\n", x); + +// char mm[100]; +// tfp_sprintf(mm, "2:%d?\n", x); +// send_command(SYS_WRITE0, mm); + +// printf(" %u?\n", usart1->SR); +// printf(" %u?\n", 1); + + if (txe) { + GPIO_SetBits(GPIOB, GPIO_Pin_All); + GPIO_ResetBits(GPIOB, GPIO_Pin_All); + + USART1->DR = (uint16_t) c; +// USART1->DR = 0x55; + + if (c == 'Z') { + c = 'a'; + } else if (c == 'z') { + c = '0'; + } else if (c == '9') { + c = '\n'; + } else if (c == '\n') { + c = 'A'; + } else { + c++; + } + } + } + + return 0; +} + |