//#include "stm322xg_eval.h"
#include <stm32f4xx_gpio.h>
#include <stm32f4xx_rcc.h>
-#include <stm32f4xx_rcc.h>
-//#include "stm32f4_discovery.h"
-
+#include <stm32f4xx_usart.h>
+#include "stm32f4_discovery.h"
void ioinit(){
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
+ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
}
-
+void stmdelay(){
+ //IO so it doesn't get swapped out.
+ __IO uint32_t count= 0x1000; // >1kbit/s
+ //__IO uint32_t count= 0x100000; // 5 bits per second, for testing
+ while(count--);
+}
void ledon(){
- //GPIOG->BSRRL=GPIO_Pin_14;
- GPIO_ResetBits(GPIOD, GPIO_Pin_14);
+ GPIO_SetBits(GPIOD, GPIO_Pin_14);
}
void ledoff(){
- //GPIOG->BSRRH=GPIO_Pin_14;
- GPIO_SetBits(GPIOD, GPIO_Pin_14);
+ GPIO_ResetBits(GPIOD, GPIO_Pin_14);
+}
+void clkon(){
+ GPIO_SetBits(GPIOD, GPIO_Pin_12);
+}
+void clkoff(){
+ GPIO_ResetBits(GPIOD, GPIO_Pin_12);
}
+void spibit(int one){
+ if(one) ledon();
+ else ledoff();
+ clkon();
+ stmdelay();
+ clkoff();
+ stmdelay();
+}
+
+void spiword(uint32_t word){
+ int i=32;
+ while(i--){
+ //morsebit(word&1);
+ //manchesterbit(word&1);
+ spibit(word&1);
+ word=(word>>1);
+ }
+}
+void spibyte(uint8_t word){
+ int i=8;
+ while(i--){
+ //morsebit(word&1);
+ //manchesterbit(word&1);
+ spibit(word&1);
+ word=(word>>1);
+ }
+}
+
+
//! Count the length of a string.
uint32_t strlen(const char *s){
- return 0;
+ int i=0;
+ while(s[i++]);
+ return i-1;
+}
+
+
+//! Initialize the USART
+void usartinit(){
+ USART_InitTypeDef USART_InitStructure;
+ GPIO_InitTypeDef GPIO_InitStructure;
+ USART_ClockInitTypeDef USART_ClockInitStruct;
+
+ /* Enable GPIOA and USART1 clock */
+ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
+
+ //USART1 and USART6, other in APB1
+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
+
+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
+ /* A 9 to USART1_Tx
+ * A10 to USART1_Rx
+ * A11 to USART1_CTS
+ * A12 to USART1_RTS
+ */
+ GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
+ GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
+ GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_USART1);
+ GPIO_PinAFConfig(GPIOA, GPIO_PinSource12, GPIO_AF_USART1);
+
+ /* Configure USART Tx and Rx as alternate function push-pull */
+ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
+ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+ GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
+ GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12;
+ GPIO_Init(GPIOA, &GPIO_InitStructure);
+
+
+ USART_StructInit(&USART_InitStructure);
+ USART_InitStructure.USART_BaudRate = 9600;
+ USART_InitStructure.USART_WordLength = USART_WordLength_8b;
+ USART_InitStructure.USART_StopBits = USART_StopBits_1;
+ USART_InitStructure.USART_Parity = USART_Parity_No;
+ USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+ USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+ USART_Init(USART1, &USART_InitStructure);
+
+
+ USART_ClockStructInit(&USART_ClockInitStruct);
+ USART_ClockInit(USART1,&USART_ClockInitStruct);
+
+ USART_Cmd(USART1, ENABLE);
}
+
//! Initialize the STM32F4xx ports and USB.
void stm32f4xx_init(){
- SystemInit();
+ int i=20;
+
+ //SystemInit();
+ usartinit();
ioinit();
- while(1){
- ledon();
- delay(0x1000);
- ledoff();
- delay(0x1000);
- }
+
+ ledoff();
+ clkoff();
+
+ return;
}
//! Receive a byte.
//! Transmit a byte.
void serial0_tx(unsigned char x){
-}
-//! Transmit a byte.
-void serial_tx_old(unsigned char x){
+ USART_SendData(USART1, (uint16_t) x);
+ //while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
+
+ spibyte(x);
}
//! Transmit a byte on the second UART.
//From min.s
void Reset_Handler(void);
-
-
// Define the vector table
unsigned int * myvectors[50]
__attribute__ ((section("vectors")))= {