/* * This file is part of the libopenstm32 project. * * Copyright (C) 2009 Uwe Hermann * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include void usart_set_baudrate(u32 usart, u32 baud) { u32 clock = 72000000; /* FIXME: Don't hardcode this clock! */ /* TODO: Document and explain calculation. */ USART_BRR(usart) = (u16)((clock << 4) / (baud * 16)); } void usart_set_databits(u32 usart, u32 bits) { if (bits == 8) USART_CR1(usart) &= ~USART_CR1_M; /* 8 data bits */ else USART_CR1(usart) |= USART_CR1_M; /* 9 data bits */ } void usart_set_stopbits(u32 usart, u32 stopbits) { u32 reg32; reg32 = USART_CR2(usart); reg32 = (reg32 & ~((1 << 13) | (1 << 12))) | (stopbits << 12); USART_CR2(usart) = reg32; } void usart_set_parity(u32 usart, u32 parity) { u32 reg32; reg32 = USART_CR1(usart); reg32 = (reg32 & ~((1 << 10) | (1 << 9))) | (parity << 9); USART_CR1(usart) = reg32; } void usart_set_mode(u32 usart, u32 mode) { u32 reg32; reg32 = USART_CR1(usart); reg32 = (reg32 & ~((1 << 3) | (1 << 2))) | (mode << 2); USART_CR1(usart) = reg32; } void usart_set_flow_control(u32 usart, u32 flowcontrol) { u32 reg32; reg32 = USART_CR3(usart); reg32 = (reg32 & ~((1 << 9) | (1 << 8))) | (flowcontrol << 2); USART_CR3(usart) = reg32; } void usart_enable(u32 usart) { USART_CR1(usart) |= USART_CR1_UE; } void usart_disable(u32 usart) { USART_CR1(usart) &= ~USART_CR1_UE; } void usart_send(u32 usart, u16 data) { /* Send data. */ USART_DR(usart) = (data & 0x1ff); /* Wait until the data has been transferred into the shift register. */ while ((USART_SR(usart) & USART_SR_TXE) == 0); } u16 usart_recv(u32 usart) { /* Wait until the data is ready to be received. */ while ((USART_SR(usart) & USART_SR_RXNE) == 0); /* Receive data. */ return USART_DR(usart) & 0x1ff; }