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stm32f0-discovery
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main: init USART1, LSE and RTC.

master
Harald Welte 2013-05-25 17:29:20 +02:00
parent 5f21986c33
commit 4501a1dcc2
1 changed files with 104 additions and 0 deletions
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104
src/main.c
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@ -1,4 +1,34 @@
#include <string.h>
#include "stm32f0xx_conf.h"
#include "stm32f0xx_rtc.h"
#include "stm32f0xx_usart.h"
static int puts(const char *str)
{
const char *p = str;
char c;
for (c = *p++; c; c = *p++) {
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) != SET) ;
USART_SendData(USART1, c);
}
}
static char bcd2char(uint8_t bcd)
{
if (bcd < 0xA)
return '0' + bcd;
else
return 'A' + (bcd - 0xA);
}
static void bcd2str(char *out, uint8_t bcd)
{
*out++ = bcd2char(bcd >> 4);
*out++ = bcd2char(bcd & 0xF);
}
void SysTick_Handler(void) {
static uint16_t tick = 0;
@ -8,9 +38,52 @@ void SysTick_Handler(void) {
tick = 0;
GPIOC->ODR ^= (1 << 8);
break;
case 25:
USART_SendData(USART1, 'A');
break;
case 75:
USART_SendData(USART1, 'z');
break;
case 50:
{
RTC_TimeTypeDef time;
char buf[128];
RTC_GetTime(RTC_Format_BCD, &time);
memset(buf, 0, sizeof(buf));
//sprintf(buf, "%02x:%02x:%02x\r\n", time.RTC_Hours, time.RTC_Minutes, time.RTC_Seconds);
bcd2str(buf, time.RTC_Seconds);
strcpy(buf+2, "s\r\n");
puts(buf);
}
break;
}
}
static GPIO_InitTypeDef gpioa9 = {
.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10,
.GPIO_Mode = GPIO_Mode_AF,
.GPIO_Speed = GPIO_Speed_Level_1,
.GPIO_OType = GPIO_OType_PP,
.GPIO_PuPd = GPIO_PuPd_UP,
};
static RTC_InitTypeDef rtcinit = {
.RTC_HourFormat = RTC_HourFormat_24,
.RTC_AsynchPrediv = (128-1),
.RTC_SynchPrediv = (256-1),
};
static USART_InitTypeDef usartinit = {
.USART_BaudRate = 115200,
.USART_WordLength = USART_WordLength_8b,
.USART_StopBits = USART_StopBits_1,
.USART_Parity = USART_Parity_No,
.USART_Mode = USART_Mode_Rx | USART_Mode_Tx,
.USART_HardwareFlowControl = USART_HardwareFlowControl_None,
};
int main(void)
{
@ -19,8 +92,39 @@ int main(void)
GPIOC->MODER = (1 << 16);
/* UART */
//RCC_USARTCLKConfig(RCC_USART1CLK_SYSCLK);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
GPIO_Init(GPIOA, &gpioa9);
USART_Init(USART1, &usartinit);
USART_Cmd(USART1, ENABLE);
#if 1
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
PWR_BackupAccessCmd(ENABLE);
/* Low-Speed External Oscillator */
RCC_LSEConfig(RCC_LSE_ON);
RCC_LSEDriveConfig(RCC_LSEDrive_High);
/* wait for LSERDY */
while (!(RCC_GetFlagStatus(RCC_FLAG_LSERDY)));
#else
RCC_LSICmd(ENABLE);
while (!(RCC_GetFlagStatus(RCC_FLAG_LSIRDY)));
#endif
/* RTC */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
RCC_RTCCLKCmd(ENABLE);
RTC_Init(&rtcinit);
SysTick_Config(SystemCoreClock/100);
puts("\r\nEntering main...\r\n");
while(1);
}