diff options
Diffstat (limited to 'libmaple/usart.c')
| -rw-r--r-- | libmaple/usart.c | 316 |
1 files changed, 77 insertions, 239 deletions
diff --git a/libmaple/usart.c b/libmaple/usart.c index 282fc5d..d08d3cf 100644 --- a/libmaple/usart.c +++ b/libmaple/usart.c @@ -36,123 +36,95 @@ #define USART1_BASE 0x40013800 #define USART2_BASE 0x40004400 #define USART3_BASE 0x40004800 +#define UART4_BASE 0x40004C00 // High-density devices only (Maple Native) +#define UART5_BASE 0x40005000 // High-density devices only (Maple Native) #define USART_UE BIT(13) #define USART_M BIT(12) #define USART_TE BIT(3) #define USART_RE BIT(2) #define USART_RXNEIE BIT(5) // read data register not empty interrupt enable -#define USART_TXE BIT(7) #define USART_TC BIT(6) -#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 USART_RECV_BUF_SIZE 64 - -/* Ring buffer notes: - * The buffer is empty when head == tail. - * The buffer is full when the head is one byte in front of the tail - * The total buffer size must be a power of two - * Note, one byte is necessarily left free with this scheme */ -typedef struct usart_ring_buf { - uint32 head; - uint32 tail; - uint8 buf[USART_RECV_BUF_SIZE]; -} usart_ring_buf; - -static usart_ring_buf ring_buf1; -static usart_ring_buf ring_buf2; -static usart_ring_buf ring_buf3; - -typedef struct usart_port { - volatile uint32 SR; // Status register - volatile uint32 DR; // Data register - volatile uint32 BRR; // Baud rate register - volatile uint32 CR1; // Control register 1 - volatile uint32 CR2; // Control register 2 - volatile uint32 CR3; // Control register 3 - volatile uint32 GTPR; // Guard time and prescaler register -} usart_port; - +/* usart descriptor table */ +struct usart_dev usart_dev_table[] = { + [USART1] = { + .base = (usart_port*)USART1_BASE, + .rcc_dev_num = RCC_USART1, + .nvic_dev_num = NVIC_USART1 + }, + [USART2] = { + .base = (usart_port*)USART2_BASE, + .rcc_dev_num = RCC_USART2, + .nvic_dev_num = NVIC_USART2 + }, + [USART3] = { + .base = (usart_port*)USART3_BASE, + .rcc_dev_num = RCC_USART3, + .nvic_dev_num = NVIC_USART3 + }, + #if NR_USART >= 5 + [UART4] = { + .base = (usart_port*)UART4_BASE, + .rcc_dev_num = RCC_UART4, + .nvic_dev_num = NVIC_UART4 + }, + [UART5] = { + .base = (usart_port*)UART5_BASE, + .rcc_dev_num = RCC_UART5, + .nvic_dev_num = NVIC_UART5 + }, + #endif +}; + +/* usart interrupt handlers */ void USART1_IRQHandler(void) { - /* Read the data */ - ring_buf1.buf[ring_buf1.tail++] = (uint8)(((usart_port*)(USART1_BASE))->DR); - ring_buf1.tail %= USART_RECV_BUF_SIZE; + rb_insert(&(usart_dev_table[USART1].rb), (uint8)(((usart_port*)(USART1_BASE))->DR)); } -/* Don't overrun your buffer, seriously */ void USART2_IRQHandler(void) { - /* Read the data */ - ring_buf2.buf[ring_buf2.tail++] = (uint8)(((usart_port*)(USART2_BASE))->DR); - ring_buf2.tail %= USART_RECV_BUF_SIZE; + rb_insert(&(usart_dev_table[USART2].rb), (uint8)(((usart_port*)(USART2_BASE))->DR)); } -/* Don't overrun your buffer, seriously */ + void USART3_IRQHandler(void) { - /* Read the data */ - ring_buf3.buf[ring_buf3.tail++] = (uint8)(((usart_port*)(USART3_BASE))->DR); - ring_buf3.tail %= USART_RECV_BUF_SIZE; + rb_insert(&usart_dev_table[USART3].rb, (uint8)(((usart_port*)(USART3_BASE))->DR)); +} +#if NR_USART >= 5 +void UART4_IRQHandler(void) { + rb_insert(&usart_dev_table[UART4].rb, (uint8)(((usart_port*)(UART4_BASE))->DR)); } +void UART5_IRQHandler(void) { + rb_insert(&usart_dev_table[UART5].rb, (uint8)(((usart_port*)(UART5_BASE))->DR)); +} +#endif /** * @brief Enable a USART in single buffer transmission mode, multibuffer - * receiver mode. - * + * receiver mode. * @param usart_num USART to be initialized * @param baud Baud rate to be set at - * @param recvBuf buf buffer for receiver - * @param len size of recvBuf - * - * @sideeffect Turns on the specified USART */ void usart_init(uint8 usart_num, uint32 baud) { - ASSERT((usart_num <= NR_USARTS) && (usart_num > 0)); - ASSERT(baud && (baud < USART_MAX_BAUD)); - + ASSERT(usart_num <= NR_USART); usart_port *port; - usart_ring_buf *ring_buf; + ring_buffer *ring_buf; uint32 clk_speed; uint32 integer_part; uint32 fractional_part; uint32 tmp; - switch (usart_num) { - case 1: - port = (usart_port*)USART1_BASE; - ring_buf = &ring_buf1; - clk_speed = USART1_CLK; - rcc_enable_clk_usart1(); - REG_SET(NVIC_ISER1, BIT(5)); - break; - case 2: - port = (usart_port*)USART2_BASE; - ring_buf = &ring_buf2; - clk_speed = USART2_CLK; - rcc_enable_clk_usart2(); - REG_SET(NVIC_ISER1, BIT(6)); - break; - case 3: - port = (usart_port*)USART3_BASE; - ring_buf = &ring_buf3; - clk_speed = USART3_CLK; - rcc_enable_clk_usart3(); - REG_SET(NVIC_ISER1, BIT(7)); - break; - default: - /* should never get here */ - ASSERT(0); - } + port = usart_dev_table[usart_num].base; + rcc_clk_enable(usart_dev_table[usart_num].rcc_dev_num); + nvic_irq_enable(usart_dev_table[usart_num].nvic_dev_num); + + /* usart1 is mad fast */ + clk_speed = (usart_num == USART1) ? 72000000UL : 36000000UL; - /* Initialize ring buffer */ - ring_buf->head = 0; - ring_buf->tail = 0; + /* Initialize rx ring buffer */ + rb_init(&usart_dev_table[usart_num].rb, + sizeof (usart_dev_table[usart_num].rx_buf), + usart_dev_table[usart_num].rx_buf); /* Set baud rate */ integer_part = ((25 * clk_speed) / (4 * baud)); @@ -172,36 +144,25 @@ void usart_init(uint8 usart_num, uint32 baud) { port->CR1 |= USART_UE; } +/** + * @brief Turn off all USARTs. + */ +void usart_disable_all() { + usart_disable(1); + usart_disable(2); + usart_disable(3); + #if NR_USART >= 5 + usart_disable(4); + usart_disable(5); + #endif +} /** * @brief Turn off a USART. - * * @param USART to be disabled - * - * @sideeffect Turns off the specified USART */ void usart_disable(uint8 usart_num) { - ASSERT((usart_num <= NR_USARTS) && (usart_num > 0)); - usart_port *port; - - switch (usart_num) { - case 1: - port = (usart_port*)USART1_BASE; - break; - case 2: - port = (usart_port*)USART2_BASE; - break; - case 3: - port = (usart_port*)USART3_BASE; - break; - default: - /* should never get here */ - ASSERT(0); - } - - /* Is this usart enabled? */ - if (!(port->SR & USART_UE)) - return; + usart_port *port = usart_dev_table[usart_num].base; /* TC bit must be high before disabling the usart */ while ((port->SR & USART_TC) == 0) @@ -211,18 +172,17 @@ void usart_disable(uint8 usart_num) { port->CR1 = 0; /* Clean up buffer */ - usart_clear_buffer(usart_num); + usart_reset_rx(usart_num); } /** * @brief Print a null terminated string to the specified USART * - * @param[in] usart_num USART to send on - * @param[in] str String to send + * @param usart_num usart to send on + * @param str string to send */ void usart_putstr(uint8 usart_num, const char* str) { - ASSERT((usart_num <= NR_USARTS) && (usart_num > 0)); char ch; while((ch = *(str++)) != '\0') { @@ -233,11 +193,10 @@ void usart_putstr(uint8 usart_num, const char* str) { /** * @brief Print an unsigned integer to the specified usart * - * @param[in] usart_num usart to send on - * @param[in] val number to print + * @param usart_num usart to send on + * @param val number to print */ void usart_putudec(uint8 usart_num, uint32 val) { - ASSERT((usart_num <= NR_USARTS) && (usart_num > 0)); char digits[12]; int i; @@ -249,125 +208,4 @@ void usart_putudec(uint8 usart_num, uint32 val) { while (--i >= 0) { usart_putc(usart_num, digits[i]); } - -} - - -/** - * @brief Return one character from the receive buffer. Assumes - * that there is data available. - * - * @param[in] usart_num number of the usart to read from - * - * @return character from ring buffer - * - * @sideeffect may update the head pointer of the recv buffer - */ -uint8 usart_getc(uint8 usart_num) { - uint8 ch; - usart_ring_buf *rb; - - switch (usart_num) { - case 1: - rb = &ring_buf1; - break; - case 2: - rb = &ring_buf2; - break; - case 3: - rb = &ring_buf3; - break; - default: - ASSERT(0); - } - - /* Make sure there's actually data to be read */ - ASSERT(rb->head != rb->tail); - - /* Read the data and check for wraparound */ - ch = rb->buf[rb->head++]; - rb->head %= USART_RECV_BUF_SIZE; - - return ch; -} - -uint32 usart_data_available(uint8 usart_num) { - usart_ring_buf *rb; - - switch (usart_num) { - case 1: - rb = &ring_buf1; - break; - case 2: - rb = &ring_buf2; - break; - case 3: - rb = &ring_buf3; - break; - default: - ASSERT(0); - } - - return rb->tail - rb->head; -} - -void usart_clear_buffer(uint8 usart_num) { - usart_ring_buf *rb; - - switch (usart_num) { - case 1: - rb = &ring_buf1; - break; - case 2: - rb = &ring_buf2; - break; - case 3: - rb = &ring_buf3; - break; - default: - ASSERT(0); - } - - rb->tail = rb->head; -} - - - -/** - * @brief Output a byte out the uart - * - * @param[in] usart_num usart number to output on - * @param[in] byte byte to send - * - */ -void usart_putc(uint8 usart_num, uint8 byte) { - ASSERT((usart_num <= NR_USARTS) && (usart_num > 0)); - usart_port *port; - - switch (usart_num) { - case 1: - port = (usart_port*)USART1_BASE; - break; - case 2: - port = (usart_port*)USART2_BASE; - break; - case 3: - port = (usart_port*)USART3_BASE; - break; - default: - /* Should never get here */ - ASSERT(0); - } - -// if (ch == '\n') { -// usart_putc(usart_num, '\r'); -// } - - port->DR = byte; - - /* Wait for transmission to complete */ - while ((port->SR & USART_TXE) == 0) - ; } - - |