#include "Usart.h"
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void Usart_Init(void)
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{
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USART_InitTypeDef USART_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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/* Enable GPIO clock */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
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/* Enable USART clock */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
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/* Configure USART Tx as alternate function push-pull */
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Pin = USART_TX_pin;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(USART_GPIO, &GPIO_InitStructure);
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/* Configure USART Rx as input floating */
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_InitStructure.GPIO_Pin = USART_RX_pin;
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GPIO_Init(USART_GPIO, &GPIO_InitStructure);
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/* USARTx configured as follow:
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- BaudRate = 115200 baud
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- Word Length = 8 Bits
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- One Stop Bit
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- No parity
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- Hardware flow control disabled (RTS and CTS signals)
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- Receive and transmit enabled
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*/
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USART_InitStructure.USART_BaudRate = BAUD_RATE ;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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/* USART configuration */
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USART_Init(EXT_USART, &USART_InitStructure);
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/* Enable USART */
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USART_Cmd(EXT_USART, ENABLE);
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}
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uint16_t Checksum_u16(uint8_t *pdata, uint32_t len)
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{
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uint16_t sum = 0;
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uint32_t i;
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for(i = 0; i < len; i++)
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sum += pdata[i];
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sum = ~sum;
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return sum;
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}
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