diff options
Diffstat (limited to 'libmaple/usart.c')
| -rw-r--r-- | libmaple/usart.c | 138 |
1 files changed, 3 insertions, 135 deletions
diff --git a/libmaple/usart.c b/libmaple/usart.c index ba63b79..1070aa2 100644 --- a/libmaple/usart.c +++ b/libmaple/usart.c @@ -33,67 +33,6 @@ #include <libmaple/usart.h> -/* - * Devices - */ - -static ring_buffer usart1_rb; -static usart_dev usart1 = { - .regs = USART1_BASE, - .rb = &usart1_rb, - .max_baud = 4500000UL, - .clk_id = RCC_USART1, - .irq_num = NVIC_USART1 -}; -/** USART1 device */ -usart_dev *USART1 = &usart1; - -static ring_buffer usart2_rb; -static usart_dev usart2 = { - .regs = USART2_BASE, - .rb = &usart2_rb, - .max_baud = 2250000UL, - .clk_id = RCC_USART2, - .irq_num = NVIC_USART2 -}; -/** USART2 device */ -usart_dev *USART2 = &usart2; - -static ring_buffer usart3_rb; -static usart_dev usart3 = { - .regs = USART3_BASE, - .rb = &usart3_rb, - .max_baud = 2250000UL, - .clk_id = RCC_USART3, - .irq_num = NVIC_USART3 -}; -/** USART3 device */ -usart_dev *USART3 = &usart3; - -#ifdef STM32_HIGH_DENSITY -static ring_buffer uart4_rb; -static usart_dev uart4 = { - .regs = UART4_BASE, - .rb = &uart4_rb, - .max_baud = 2250000UL, - .clk_id = RCC_UART4, - .irq_num = NVIC_UART4 -}; -/** UART4 device */ -usart_dev *UART4 = &uart4; - -static ring_buffer uart5_rb; -static usart_dev uart5 = { - .regs = UART5_BASE, - .rb = &uart5_rb, - .max_baud = 2250000UL, - .clk_id = RCC_UART5, - .irq_num = NVIC_UART5 -}; -/** UART5 device */ -usart_dev *UART5 = &uart5; -#endif - /** * @brief Initialize a serial port. * @param dev Serial port to be initialized @@ -105,27 +44,6 @@ void usart_init(usart_dev *dev) { } /** - * @brief Configure a serial port's baud rate. - * - * @param dev Serial port to be configured - * @param clock_speed Clock speed, in megahertz. - * @param baud Baud rate for transmit/receive. - */ -void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) { - uint32 integer_part; - uint32 fractional_part; - uint32 tmp; - - /* See ST RM0008 for the details on configuring the baud rate register */ - integer_part = (25 * clock_speed) / (4 * baud); - tmp = (integer_part / 100) << 4; - fractional_part = integer_part - (100 * (tmp >> 4)); - tmp |= (((fractional_part * 16) + 50) / 100) & ((uint8)0x0F); - - dev->regs->BRR = (uint16)tmp; -} - -/** * @brief Enable a serial port. * * USART is enabled in single buffer transmission mode, multibuffer @@ -138,7 +56,8 @@ void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) { */ void usart_enable(usart_dev *dev) { usart_reg_map *regs = dev->regs; - regs->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE; + regs->CR1 = (USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE | + USART_CR1_M_8N1); regs->CR1 |= USART_CR1_UE; } @@ -147,7 +66,7 @@ void usart_enable(usart_dev *dev) { * @param dev Serial port to be disabled */ void usart_disable(usart_dev *dev) { - /* FIXME this misbehaves if you try to use PWM on TX afterwards */ + /* FIXME this misbehaves (on F1) if you try to use PWM on TX afterwards */ usart_reg_map *regs = dev->regs; /* TC bit must be high before disabling the USART */ @@ -162,20 +81,6 @@ void usart_disable(usart_dev *dev) { } /** - * @brief Call a function on each USART. - * @param fn Function to call. - */ -void usart_foreach(void (*fn)(usart_dev*)) { - fn(USART1); - fn(USART2); - fn(USART3); -#ifdef STM32_HIGH_DENSITY - fn(UART4); - fn(UART5); -#endif -} - -/** * @brief Nonblocking USART transmit * @param dev Serial port to transmit over * @param buf Buffer to transmit @@ -230,40 +135,3 @@ void usart_putudec(usart_dev *dev, uint32 val) { usart_putc(dev, digits[i]); } } - -/* - * Interrupt handlers. - */ - -static inline void usart_irq(usart_dev *dev) { -#ifdef USART_SAFE_INSERT - /* If the buffer is full and the user defines USART_SAFE_INSERT, - * ignore new bytes. */ - rb_safe_insert(dev->rb, (uint8)dev->regs->DR); -#else - /* By default, push bytes around in the ring buffer. */ - rb_push_insert(dev->rb, (uint8)dev->regs->DR); -#endif -} - -void __irq_usart1(void) { - usart_irq(USART1); -} - -void __irq_usart2(void) { - usart_irq(USART2); -} - -void __irq_usart3(void) { - usart_irq(USART3); -} - -#ifdef STM32_HIGH_DENSITY -void __irq_uart4(void) { - usart_irq(UART4); -} - -void __irq_uart5(void) { - usart_irq(UART5); -} -#endif |