diff options
Diffstat (limited to 'src/lib/usart.h')
| -rw-r--r-- | src/lib/usart.h | 73 |
1 files changed, 35 insertions, 38 deletions
diff --git a/src/lib/usart.h b/src/lib/usart.h index 30f7dc1..4d0c586 100644 --- a/src/lib/usart.h +++ b/src/lib/usart.h @@ -1,7 +1,30 @@ +/* ***************************************************************************** + * 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 <http://www.gnu.org/licenses/>. + * + * Created: 12/18/09 02:38:35 + * Copyright (c) 2009 Perry L. Hung. All rights reserved. + * + * ****************************************************************************/ + +/** + * @file usart.h + * + * @brief USART Definitions + */ + #ifndef _USART_H_ #define _USART_H_ -#include <inttypes.h> -#include <util.h> /* Transmit procedure: * 1. Enable the USART by writing the UE bit in USART_CR1 register to 1. @@ -77,50 +100,24 @@ * 921600 923.076 2.4375 0.16% 4.875 0.16% * 225000 2250 1 0% 2 0% * - * USART_BRR[15:4] = mantissa - * USART_BRR[3:0] = fraction - * 111010 - * 0110 * */ #define NR_USARTS 0x3 -//#define USART1_BASE 0x40013800 -//#define USART2_BASE 0x40004400 -//#define USART3_BASE 0x40004800 - -#define USART_UE BIT(13) -#define USART_M BIT(12) -#define USART_TE BIT(3) -#define USART_TXE BIT(7) -#define USART_STOP_BITS_1 BIT_MASK_SHIFT(0b0, 12) -#define USART_STOP_BITS_05 BIT_MASK_SHIFT(0b01, 12) -#define USART_STOP_BITS_2 BIT_MASK_SHIFT(0b02, 12) -#define USART_STOP_BITS_15 BIT_MASK_SHIFT(0b02, 12) - -#define USART1_CLK 72000000UL -#define USART2_CLK 36000000UL -#define USART3_CLK 36000000UL - -#define B9600_MANTISSA 0xEA -#define B9600_FRACTION 0x06 - - -typedef struct usart_port { - volatile uint32_t SR; - volatile uint32_t DR; - volatile uint32_t BRR; - volatile uint32_t CR1; - volatile uint32_t CR2; - volatile uint32_t CR3; - volatile uint32_t GTPR; -} usart_port; - #ifdef __cplusplus extern "C"{ #endif -int32_t usart_init(uint8_t); +#define USART_MAX_BAUD 225000 + +void usart_init(uint8 usart_num, uint32 baud); +void usart_disable(uint8 usart_num); + +void usart_putstr(uint8 usart_num, const char*); +void usart_putudec(uint8 usart_num, uint32 val); +void usart_putc(uint8 usart_num, uint8 ch); +uint32 usart_data_available(uint8 usart_num); +uint8 usart_getc(uint8 usart_num); #ifdef __cplusplus } // extern "C" |