kopia lustrzana https://github.com/mikaelnousiainen/RS41ng
59 wiersze
1.6 KiB
C
59 wiersze
1.6 KiB
C
#include <stm32f10x_rcc.h>
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#include <stm32f10x_gpio.h>
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#include <stm32f10x_usart.h>
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#include "usart_ext.h"
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// USART3 is the external serial port, which shares TX/RX pins with the external I²C bus.
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void usart_ext_init(uint32_t baud_rate)
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{
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GPIO_InitTypeDef gpio_init;
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// USART3 TX
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gpio_init.GPIO_Pin = GPIO_Pin_10;
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gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
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gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &gpio_init);
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// USART3 RX
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gpio_init.GPIO_Pin = GPIO_Pin_11;
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gpio_init.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOB, &gpio_init);
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NVIC_DisableIRQ(USART3_IRQn);
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USART_Cmd(USART3, DISABLE);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
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USART_InitTypeDef usart_init;
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usart_init.USART_BaudRate = baud_rate;
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usart_init.USART_WordLength = USART_WordLength_8b;
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usart_init.USART_StopBits = USART_StopBits_1;
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usart_init.USART_Parity = USART_Parity_No;
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usart_init.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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usart_init.USART_Mode = USART_Mode_Tx; // Enable only transmit for now | USART_Mode_Rx;
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USART_Init(USART3, &usart_init);
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USART_Cmd(USART3, ENABLE);
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}
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void usart_ext_uninit()
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{
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USART_Cmd(USART3, DISABLE);
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USART_DeInit(USART3);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, DISABLE);
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}
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void usart_ext_enable(bool enabled)
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{
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USART_Cmd(USART3, enabled ? ENABLE : DISABLE);
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}
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void usart_ext_send_byte(uint8_t data)
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{
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while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET) {}
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USART_SendData(USART3, data);
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while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET) {}
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}
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