tinyriscv/sdk/bsp/include/uart.h

#ifndef _UART_REG_DEFS_
#define _UART_REG_DEFS_

#ifdef __cplusplus
extern "C" {
#endif
// Register width
#define UART_PARAM_REG_WIDTH 32

#define UART0_BASE_ADDR             (0x05000000)
#define UART1_BASE_ADDR             (0x09000000)
#define UART2_BASE_ADDR             (0x0A000000)

#define UART0                       (UART0_BASE_ADDR)
#define UART1                       (UART1_BASE_ADDR)
#define UART2                       (UART2_BASE_ADDR)

#define UART_REG(base, offset)      (*((volatile uint32_t *)(base + offset)))

#define UART_TX_FIFO_LEN    (8)
#define UART_RX_FIFO_LEN    UART_TX_FIFO_LEN

typedef void (*myputc)(uint8_t);

void uart0_putc(uint8_t c);
uint8_t uart0_getc();
void uart1_putc(uint8_t c);
uint8_t uart1_getc();
void uart2_putc(uint8_t c);
uint8_t uart2_getc();
void uart_init(uint32_t base, myputc put);
void uart_tx_enable(uint32_t base, uint8_t en);
void uart_rx_enable(uint32_t base, uint8_t en);
void uart_tx_fifo_empty_int_enable(uint32_t base, uint8_t en);
void uart_rx_fifo_not_empty_int_enable(uint32_t base, uint8_t en);
void uart_set_baud_div(uint32_t base, uint32_t div);
void uart_reset_tx_fifo(uint32_t base);
void uart_reset_rx_fifo(uint32_t base);
uint8_t uart_tx_fifo_full(uint32_t base);
uint8_t uart_rx_fifo_full(uint32_t base);
uint8_t uart_tx_fifo_empty(uint32_t base);
uint8_t uart_rx_fifo_empty(uint32_t base);
uint8_t uart_tx_idle(uint32_t base);
uint8_t uart_rx_idle(uint32_t base);
uint8_t uart_get_rx_fifo_data(uint32_t base);
void uart_set_tx_fifo_data(uint32_t base, uint8_t data);

// UART control register
#define UART_CTRL_REG_OFFSET 0x0
#define UART_CTRL_REG_RESVAL 0xd90000
#define UART_CTRL_TX_EN_BIT 0
#define UART_CTRL_RX_EN_BIT 1
#define UART_CTRL_TX_FIFO_EMPTY_INT_EN_BIT 2
#define UART_CTRL_RX_FIFO_NOT_EMPTY_INT_EN_BIT 3
#define UART_CTRL_TX_FIFO_RST_BIT 4
#define UART_CTRL_RX_FIFO_RST_BIT 5
#define UART_CTRL_BAUD_DIV_MASK 0xffff
#define UART_CTRL_BAUD_DIV_OFFSET 16
#define UART_CTRL_BAUD_DIV_FIELD \
  ((bitfield_field32_t) { .mask = UART_CTRL_BAUD_DIV_MASK, .index = UART_CTRL_BAUD_DIV_OFFSET })

// UART status register
#define UART_STATUS_REG_OFFSET 0x4
#define UART_STATUS_REG_RESVAL 0x3c
#define UART_STATUS_TXFULL_BIT 0
#define UART_STATUS_RXFULL_BIT 1
#define UART_STATUS_TXEMPTY_BIT 2
#define UART_STATUS_RXEMPTY_BIT 3
#define UART_STATUS_TXIDLE_BIT 4
#define UART_STATUS_RXIDLE_BIT 5

// UART TX data register
#define UART_TXDATA_REG_OFFSET 0x8
#define UART_TXDATA_REG_RESVAL 0x0
#define UART_TXDATA_TXDATA_MASK 0xff
#define UART_TXDATA_TXDATA_OFFSET 0
#define UART_TXDATA_TXDATA_FIELD \
  ((bitfield_field32_t) { .mask = UART_TXDATA_TXDATA_MASK, .index = UART_TXDATA_TXDATA_OFFSET })

// UART RX data register
#define UART_RXDATA_REG_OFFSET 0xc
#define UART_RXDATA_REG_RESVAL 0x0
#define UART_RXDATA_RXDATA_MASK 0xff
#define UART_RXDATA_RXDATA_OFFSET 0
#define UART_RXDATA_RXDATA_FIELD \
  ((bitfield_field32_t) { .mask = UART_RXDATA_RXDATA_MASK, .index = UART_RXDATA_RXDATA_OFFSET })

#ifdef __cplusplus
}  // extern "C"
#endif
#endif  // _UART_REG_DEFS_