//! 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);
+ USART_InitTypeDef USART_InitStructure;
- //USART1 and USART6, other in APB1
+ /* --------------------------- System Clocks Configuration -----------------*/
+ /* USART1 clock enable */
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 */
+ /* GPIOB clock enable */
+ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
+
+
+
+ /*-------------------------- GPIO Configuration ----------------------------*/
+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
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);
-
+ GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
+ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+ GPIO_Init(GPIOB, &GPIO_InitStructure);
+
+ /* Connect USART pins to AF */
+ GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1); // USART1_TX
+ GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1); // USART1_RX
- USART_StructInit(&USART_InitStructure);
+ /* USARTx configuration ------------------------------------------------------*/
+ /* USARTx configured as follow:
+ - BaudRate = 9600 baud
+ - Word Length = 8 Bits
+ - One Stop Bit
+ - No parity
+ - Hardware flow control disabled (RTS and CTS signals)
+ - Receive and transmit enabled
+ */
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_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+
+ //USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+ USART_InitStructure.USART_Mode = USART_Mode_Tx;
+
USART_Init(USART1, &USART_InitStructure);
-
-
- USART_ClockStructInit(&USART_ClockInitStruct);
- USART_ClockInit(USART1,&USART_ClockInitStruct);
-
+
USART_Cmd(USART1, ENABLE);
}
void stm32f4xx_init(){
int i=20;
- //SystemInit();
- usartinit();
+ SystemInit();
ioinit();
+ usartinit();
- ledoff();
- clkoff();
return;
}
//! Receive a byte.
unsigned char serial0_rx(){
+ while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET); // Wait for Character
+ return USART_ReceiveData(USART1);
}
//! Receive a byte.
//! Transmit a byte.
void serial0_tx(unsigned char x){
+
+ spiword(0xdead);
+
+ while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, (uint16_t) x);
- //while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
- spibyte(x);
+ spiword(0xbeef);
}
//! Transmit a byte on the second UART.