102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopenstm32.h>
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void usart_set_baudrate(u32 usart, u32 baud)
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{
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u32 clock = 36000000; /* FIXME: Don't hardcode this clock! */
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/* TODO: Document and explain calculation. */
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USART_BRR(usart) = (u16)((clock << 4) / (baud * 16));
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}
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void usart_set_databits(u32 usart, u32 bits)
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{
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if (bits == 8)
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USART_CR1(usart) &= ~USART_CR1_M; /* 8 data bits */
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else
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USART_CR1(usart) |= USART_CR1_M; /* 9 data bits */
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}
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void usart_set_stopbits(u32 usart, u32 stopbits)
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{
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u32 reg32;
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reg32 = USART_CR2(usart);
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reg32 = (reg32 & ~((1 << 13) | (1 << 12))) | (stopbits << 12);
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USART_CR2(usart) = reg32;
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}
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void usart_set_parity(u32 usart, u32 parity)
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{
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u32 reg32;
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reg32 = USART_CR1(usart);
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reg32 = (reg32 & ~((1 << 10) | (1 << 9))) | (parity << 9);
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USART_CR1(usart) = reg32;
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}
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void usart_set_mode(u32 usart, u32 mode)
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{
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u32 reg32;
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reg32 = USART_CR1(usart);
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reg32 = (reg32 & ~((1 << 3) | (1 << 2))) | (mode << 2);
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USART_CR1(usart) = reg32;
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}
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void usart_set_flow_control(u32 usart, u32 flowcontrol)
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{
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u32 reg32;
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reg32 = USART_CR3(usart);
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reg32 = (reg32 & ~((1 << 9) | (1 << 8))) | (flowcontrol << 2);
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USART_CR3(usart) = reg32;
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}
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void usart_enable(u32 usart)
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{
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USART_CR1(usart) |= USART_CR1_UE;
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}
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void usart_disable(u32 usart)
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{
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USART_CR1(usart) &= ~USART_CR1_UE;
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}
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void usart_send(u32 usart, u16 data)
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{
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/* Send data. */
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USART_DR(usart) = (data & 0x1ff);
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/* Wait until the data has been transferred into the shift register. */
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while ((USART_SR(usart) & USART_SR_TXE) == 0);
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}
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u16 usart_recv(u32 usart)
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{
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/* Wait until the data is ready to be received. */
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while ((USART_SR(usart) & USART_SR_RXNE) == 0);
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/* Receive data. */
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return USART_DR(usart) & 0x1ff;
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}
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