diff options
Diffstat (limited to 'libmaple/usart.h')
| -rw-r--r-- | libmaple/usart.h | 315 |
1 files changed, 257 insertions, 58 deletions
diff --git a/libmaple/usart.h b/libmaple/usart.h index 90b3415..7a93da0 100644 --- a/libmaple/usart.h +++ b/libmaple/usart.h @@ -30,94 +30,293 @@ #ifndef _USART_H_ #define _USART_H_ +#include "libmaple_types.h" +#include "util.h" +#include "rcc.h" +#include "nvic.h" #include "ring_buffer.h" #ifdef __cplusplus extern "C"{ #endif -#define USART_TXE BIT(7) +/* + * Register maps and devices + */ + +/** USART register map type */ +typedef struct usart_reg_map { + __io uint32 SR; /**< Status register */ + __io uint32 DR; /**< Data register */ + __io uint32 BRR; /**< Baud rate register */ + __io uint32 CR1; /**< Control register 1 */ + __io uint32 CR2; /**< Control register 2 */ + __io uint32 CR3; /**< Control register 3 */ + __io uint32 GTPR; /**< Guard time and prescaler register */ +} usart_reg_map; -/* usart device numbers */ -enum { - USART1, - USART2, - USART3, +/** USART1 register map base pointer */ +#define USART1_BASE ((struct usart_reg_map*)0x40013800) +/** USART2 register map base pointer */ +#define USART2_BASE ((struct usart_reg_map*)0x40004400) +/** USART3 register map base pointer */ +#define USART3_BASE ((struct usart_reg_map*)0x40004800) #ifdef STM32_HIGH_DENSITY - UART4, - UART5, +/** UART4 register map base pointer */ +#define UART4_BASE ((struct usart_reg_map*)0x40004C00) +/** UART5 register map base pointer */ +#define UART5_BASE ((struct usart_reg_map*)0x40005000) #endif -}; - -/* peripheral register struct */ -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 */ -struct usart_dev { - usart_port *base; - ring_buffer rb; - uint8 rx_buf[64]; - const uint8 rcc_dev_num; - const uint8 nvic_dev_num; -}; - -extern struct usart_dev usart_dev_table[]; + +/* + * Register bit definitions + */ + +/* Status register */ + +#define USART_SR_CTS_BIT 9 +#define USART_SR_LBD_BIT 8 +#define USART_SR_TXE_BIT 7 +#define USART_SR_TC_BIT 6 +#define USART_SR_RXNE_BIT 5 +#define USART_SR_IDLE_BIT 4 +#define USART_SR_ORE_BIT 3 +#define USART_SR_NE_BIT 2 +#define USART_SR_FE_BIT 1 +#define USART_SR_PE_BIT 0 + +#define USART_SR_CTS BIT(USART_SR_CTS_BIT) +#define USART_SR_LBD BIT(USART_SR_LBD_BIT) +#define USART_SR_TXE BIT(USART_SR_TXE_BIT) +#define USART_SR_TC BIT(USART_SR_TC_BIT) +#define USART_SR_RXNE BIT(USART_SR_RXNE_BIT) +#define USART_SR_IDLE BIT(USART_SR_IDLE_BIT) +#define USART_SR_ORE BIT(USART_SR_ORE_BIT) +#define USART_SR_NE BIT(USART_SR_NE_BIT) +#define USART_SR_FE BIT(USART_SR_FE_BIT) +#define USART_SR_PE BIT(USART_SR_PE_BIT) + +/* Data register */ + +#define USART_DR_DR 0xFF + +/* Baud rate register */ + +#define USART_BRR_DIV_MANTISSA (0xFFF << 4) +#define USART_BRR_DIV_FRACTION 0xF + +/* Control register 1 */ + +#define USART_CR1_UE_BIT 13 +#define USART_CR1_M_BIT 12 +#define USART_CR1_WAKE_BIT 11 +#define USART_CR1_PCE_BIT 10 +#define USART_CR1_PS_BIT 9 +#define USART_CR1_PEIE_BIT 8 +#define USART_CR1_TXEIE_BIT 7 +#define USART_CR1_TCIE_BIT 6 +#define USART_CR1_RXNEIE_BIT 5 +#define USART_CR1_IDLEIE_BIT 4 +#define USART_CR1_TE_BIT 3 +#define USART_CR1_RE_BIT 2 +#define USART_CR1_RWU_BIT 1 +#define USART_CR1_SBK_BIT 0 + +#define USART_CR1_UE BIT(USART_CR1_UE_BIT) +#define USART_CR1_M BIT(USART_CR1_M_BIT) +#define USART_CR1_WAKE BIT(USART_CR1_WAKE_BIT) +#define USART_CR1_WAKE_IDLE (0 << USART_CR1_WAKE_BIT) +#define USART_CR1_WAKE_ADDR (1 << USART_CR1_WAKE_BIT) +#define USART_CR1_PCE BIT(USART_CR1_PCE_BIT) +#define USART_CR1_PS BIT(USART_CR1_PS_BIT) +#define USART_CR1_PS_EVEN (0 << USART_CR1_PS_BIT) +#define USART_CR1_PS_ODD (1 << USART_CR1_PS_BIT) +#define USART_CR1_PEIE BIT(USART_CR1_PEIE_BIT) +#define USART_CR1_TXEIE BIT(USART_CR1_TXEIE_BIT) +#define USART_CR1_TCIE BIT(USART_CR1_TCIE_BIT) +#define USART_CR1_RXNEIE BIT(USART_CR1_RXNEIE_BIT) +#define USART_CR1_IDLEIE BIT(USART_CR1_IDLEIE_BIT) +#define USART_CR1_TE BIT(USART_CR1_TE_BIT) +#define USART_CR1_RE BIT(USART_CR1_RE_BIT) +#define USART_CR1_RWU BIT(USART_CR1_RWU_BIT) +#define USART_CR1_RWU_ACTIVE (0 << USART_CR1_RWU_BIT) +#define USART_CR1_RWU_MUTE (1 << USART_CR1_RWU_BIT) +#define USART_CR1_SBK BIT(USART_CR1_SBK_BIT) + +/* Control register 2 */ + +#define USART_CR2_LINEN_BIT 14 +#define USART_CR2_CLKEN_BIT 11 +#define USART_CR2_CPOL_BIT 10 +#define USART_CR2_CPHA_BIT 9 +#define USART_CR2_LBCL_BIT 8 +#define USART_CR2_LBDIE_BIT 6 +#define USART_CR2_LBDL_BIT 5 + +#define USART_CR2_LINEN BIT(USART_CR2_LINEN_BIT) +#define USART_CR2_STOP (0x3 << 12) +#define USART_CR2_STOP_BITS_1 (0x0 << 12) +/* Not on UART4, UART5 */ +#define USART_CR2_STOP_BITS_POINT_5 (0x1 << 12) +/* Not on UART4, UART5 */ +#define USART_CR2_STOP_BITS_1_POINT_5 (0x3 << 12) +#define USART_CR2_STOP_BITS_2 (0x2 << 12) +#define USART_CR2_CLKEN BIT(USART_CR2_CLKEN_BIT) +/* Not on UART4, UART5 */ +#define USART_CR2_CPOL BIT(USART_CR2_CPOL_BIT) +#define USART_CR2_CPOL_LOW (0x0 << USART_CR2_CLKEN_BIT) +#define USART_CR2_CPOL_HIGH (0x1 << USART_CR2_CLKEN_BIT) +/* Not on UART4, UART5 */ +#define USART_CR2_CPHA BIT(USART_CR2_CPHA_BIT) +#define USART_CR2_CPHA_FIRST (0x0 << USART_CR2_CPHA_BIT) +#define USART_CR2_CPHA_SECOND (0x1 << USART_CR2_CPHA_BIT) +/* Not on UART4, UART5 */ +#define USART_CR2_LBCL BIT(USART_CR2_LBCL_BIT) +#define USART_CR2_LBDIE BIT(USART_CR2_LBDIE_BIT) +#define USART_CR2_LBDL BIT(USART_CR2_LBDL_BIT) +#define USART_CR2_LBDL_10_BIT (0 << USART_CR2_LBDL_BIT) +#define USART_CR2_LBDL_11_BIT (1 << USART_CR2_LBDL_BIT) +#define USART_CR2_ADD 0xF + +/* Control register 3 */ + +#define USART_CR3_CTSIE_BIT 10 +#define USART_CR3_CTSE_BIT 9 +#define USART_CR3_RTSE_BIT 8 +#define USART_CR3_DMAT_BIT 7 +#define USART_CR3_DMAR_BIT 6 +#define USART_CR3_SCEN_BIT 5 +#define USART_CR3_NACK_BIT 4 +#define USART_CR3_HDSEL_BIT 3 +#define USART_CR3_IRLP_BIT 2 +#define USART_CR3_IREN_BIT 1 +#define USART_CR3_EIE_BIT 0 + +/* Not on UART4, UART5 */ +#define USART_CR3_CTSIE BIT(USART_CR3_CTSIE_BIT) +/* Not on UART4, UART5 */ +#define USART_CR3_CTSE BIT(USART_CR3_CTSE_BIT) +/* Not on UART4, UART5 */ +#define USART_CR3_RTSE BIT(USART_CR3_RTSE_BIT) +/* Not on UART5 */ +#define USART_CR3_DMAT BIT(USART_CR3_DMAT_BIT) +/* Not on UART5 */ +#define USART_CR3_DMAR BIT(USART_CR3_DMAR_BIT) +/* Not on UART4, UART5 */ +#define USART_CR3_SCEN BIT(USART_CR3_SCEN_BIT) +/* Not on UART4, UART5 */ +#define USART_CR3_NACK BIT(USART_CR3_NACK_BIT) +#define USART_CR3_HDSEL BIT(USART_CR3_HDSEL_BIT) +#define USART_CR3_IRLP BIT(USART_CR3_IRLP_BIT) +#define USART_CR3_IRLP_NORMAL (0 << USART_CR3_IRLP_BIT) +#define USART_CR3_IRLP_LOW_POWER (1 << USART_CR3_IRLP_BIT) +#define USART_CR3_IREN BIT(USART_CR3_IREN_BIT) +#define USART_CR3_EIE BIT(USART_CR3_EIE_BIT) + +/* Guard time and prescaler register */ + +/* Not on UART4, UART5 */ +#define USART_GTPR_GT (0xFF << 8) +/* Not on UART4, UART5 */ +#define USART_GTPR_PSC 0xFF + +/* + * Devices + */ + +#define USART_RX_BUF_SIZE 64 + +/** USART device type */ +typedef struct usart_dev { + usart_reg_map *regs; + ring_buffer *rb; + uint32 max_baud; + uint8 rx_buf[USART_RX_BUF_SIZE]; + rcc_clk_id clk_id; + nvic_irq_num irq_num; +} usart_dev; + +/** USART1 device */ +extern usart_dev *USART1; +/** USART2 device */ +extern usart_dev *USART2; +/** USART3 device */ +extern usart_dev *USART3; +#ifdef STM32_HIGH_DENSITY +/** UART4 device */ +extern usart_dev *UART4; +/** UART5 device */ +extern usart_dev *UART5; +#endif + +#ifdef STM32_MEDIUM_DENSITY +#define NR_USARTS 3 +#elif defined(STM32_HIGH_DENSITY) +#define NR_USARTS 5 +#else +#warn "Only medium and high density devices are currently supported" +#endif + +void usart_init(usart_dev *dev); +void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud); +void usart_enable(usart_dev *dev); +void usart_disable(usart_dev *dev); +void usart_foreach(void (*fn)(usart_dev *dev)); +void usart_putstr(usart_dev *dev, const char*); +void usart_putudec(usart_dev *dev, uint32 val); /** - * @brief send one character on a usart - * @param usart_num usart to send on - * @param byte byte to send + * @brief Disable all serial ports. */ -static inline void usart_putc(uint8 usart_num, uint8 byte) { - usart_port *port = usart_dev_table[usart_num].base; +static inline void usart_disable_all(void) { + usart_foreach(usart_disable); +} - /* Wait for the buffer to empty */ - while ((port->SR & USART_TXE) == 0) +/** + * @brief Transmit one character on a serial port. + * @param dev Serial port to send on. + * @param byte Byte to transmit. + */ +static inline void usart_putc(usart_dev* dev, uint8 byte) { + usart_reg_map *regs = dev->regs; + + while ((regs->SR & USART_SR_TXE) == 0) ; - port->DR = byte; + regs->DR = byte; } /** - * @brief read one character from a usart - * @param usart_num usart to read from + * @brief Read one character from a serial port. + * + * It's not safe to call this function if the serial port has no data + * available. + * + * @param dev Serial port to read from * @return byte read + * @see usart_data_available() */ -static inline uint8 usart_getc(uint8 usart_num) { - return rb_remove(&usart_dev_table[usart_num].rb); +static inline uint8 usart_getc(usart_dev *dev) { + return rb_remove(dev->rb); } /** - * @brief return the amount of data available in the rx buffer - * @param usart_num which usart to check - * @return number of bytes in the rx buffer + * @brief Return the amount of data available in a serial port's RX buffer. + * @param dev Serial port to check + * @return Number of bytes in dev's RX buffer. */ -static inline uint32 usart_data_available(uint8 usart_num) { - return rb_full_count(&usart_dev_table[usart_num].rb); +static inline uint32 usart_data_available(usart_dev *dev) { + return rb_full_count(dev->rb); } /** - * @brief removes the contents of the rx fifo - * @param usart_num which usart to reset + * @brief Discard the contents of a serial port's RX buffer. + * @param dev Serial port whose buffer to empty. */ -static inline void usart_reset_rx(uint8 usart_num) { - rb_reset(&usart_dev_table[usart_num].rb); +static inline void usart_reset_rx(usart_dev *dev) { + rb_reset(dev->rb); } -void usart_init(uint8 usart_num, uint32 baud); -void usart_disable(uint8 usart_num); -void usart_disable_all(); -void usart_putstr(uint8 usart_num, const char*); -void usart_putudec(uint8 usart_num, uint32 val); - #ifdef __cplusplus } // extern "C" #endif |