diff options
Diffstat (limited to 'sw/z80/drivers/include')
| -rw-r--r-- | sw/z80/drivers/include/ctc.h | 6 | ||||
| -rw-r--r-- | sw/z80/drivers/include/pio.h | 38 | ||||
| -rw-r--r-- | sw/z80/drivers/include/usart.h | 158 |
3 files changed, 202 insertions, 0 deletions
diff --git a/sw/z80/drivers/include/ctc.h b/sw/z80/drivers/include/ctc.h new file mode 100644 index 0000000..80e8b4b --- /dev/null +++ b/sw/z80/drivers/include/ctc.h @@ -0,0 +1,6 @@ +#ifndef __CTC_H__ +#define __CTC_H__ + +void ctc_control(); + +#endif /* __CTC_H__ */ diff --git a/sw/z80/drivers/include/pio.h b/sw/z80/drivers/include/pio.h new file mode 100644 index 0000000..e91029c --- /dev/null +++ b/sw/z80/drivers/include/pio.h @@ -0,0 +1,38 @@ +#ifndef __PIO_H__ +#define __PIO_H__ + +#include "addresses.h" +#include <stdint.h> + +#define PIO_A 0 +#define PIO_B 1 + +#define PIO_MODE_BYTE_IN 0 +#define PIO_MODE_BYTE_OUT 1 +#define PIO_MODE_BYTE_BI 2 +#define PIO_MODE_BIT_IO 3 + +#define PIO_INT_ACTIVE_HIGH (1<<5) +#define PIO_INT_AND_MODE (1<<6) +#define PIO_INT_ENABLE (1<<7) + + +inline void _pio_data(int port, uint8_t data); +inline void _pio_control(int port, uint8_t cmd); + +/* the last argument is needed only for IO mode */ +void pio_set_mode(int port, int mode, uint8_t io); + +void pio_set_interrupts(int port, int control); +void pio_set_interrupts_mask(int port, int control, uint8_t mask); + +// uint8_t pio_read_data(int port); +uint8_t pio_read(int port); +void pio_write(int port, uint8_t data); + +inline int pio_read_pin(int port, uint8_t pin); +inline void pio_write_pin(int port, uint8_t pin); + +// TODO: implement mode (in/out/both) and interrupt vector + +#endif /* __PIO_H__ */ diff --git a/sw/z80/drivers/include/usart.h b/sw/z80/drivers/include/usart.h new file mode 100644 index 0000000..bb06aab --- /dev/null +++ b/sw/z80/drivers/include/usart.h @@ -0,0 +1,158 @@ +#ifndef __USART_H__ +#define __USART_H__ + +#include "addresses.h" + +#include <stdint.h> +#include <string.h> + +// baudrate clock divisors +// values from TL16C550C datasheet (table 9 for 1.8432 MHz crystal) +#define USART_BAUDRATE_50 2304 +#define USART_BAUDRATE_75 1536 +#define USART_BAUDRATE_110 1047 +#define USART_BAUDRATE_134_5 857 +#define USART_BAUDRATE_150 768 +#define USART_BAUDRATE_300 384 +#define USART_BAUDRATE_600 192 +#define USART_BAUDRATE_1200 96 +#define USART_BAUDRATE_1800 64 +#define USART_BAUDRATE_2000 58 +#define USART_BAUDRATE_2400 48 +#define USART_BAUDRATE_3600 32 +#define USART_BAUDRATE_4800 24 +#define USART_BAUDRATE_7200 16 +#define USART_BAUDRATE_9600 12 +#define USART_BAUDRATE_19200 6 +#define USART_BAUDRATE_38400 3 +#define USART_BAUDRATE_56000 3 + +// parity +#define USART_PARITY_NONE 0 +#define USART_PARITY_EVEN 1 +#define USART_PARITY_ODD 2 + +// stop bits +#define USART_STOP_BITS_1 10 +#define USART_STOP_BITS_15 15 +#define USART_STOP_BITS_2 20 + +// word lenght +#define USART_WORD_LENGTH_5 0 +#define USART_WORD_LENGTH_6 1 +#define USART_WORD_LENGTH_7 2 +#define USART_WORD_LENGTH_8 3 + +// autoflow +#define USART_AUTOFLOW_ALL 3 +#define USART_AUTOFLOW_CTS 2 +#define USART_AUTOFLOW_OFF 0 + +typedef unsigned int uint; +typedef uint8_t register_t; + +/* stuctures for usart registers */ +struct IER +{ + volatile uint received_data_interrupt :1; + volatile uint transmitter_empty_interrupt :1; + volatile uint receiver_line_status_interrupt :1; + volatile uint modem_status_interrupt :1; + volatile uint reserved :4; +}; + +struct IIR +{ + volatile uint interrupt_pending :1; + volatile uint interrupt_id :3; + volatile uint reserved :2; + volatile uint fifos :2; +}; + +struct FCR +{ + volatile uint fifo_enable :1; + volatile uint receiver_fifo_rst :1; + volatile uint trasmitter_fifo_rst :1; + volatile uint dma_mode_select :1; + volatile uint reserved :1; + volatile uint receiver_trigger :2; +}; + +struct LCR +{ + volatile uint word_length :2; + volatile uint stop_bits :1; + volatile uint parity :1; + volatile uint even_parity :1; + volatile uint stick_parity :1; + volatile uint break_control :1; + volatile uint divisor_latch_access :1; +}; + +struct MCR +{ + volatile uint data_terminal_ready :1; + volatile uint request_to_send :1; + volatile uint out1; + volatile uint out2; + volatile uint loop; + volatile uint autoflow :1; + volatile uint reserved :2; +}; + +struct LSR +{ + volatile uint data_ready :1; + volatile uint overrun_error :1; + volatile uint parity_error :1; + volatile uint framing_error :1; + volatile uint break_interrupt :1; + volatile uint transmitter_holder_empty :1; + volatile uint transmitter_empty :1; + volatile uint fifo_recv_error :1; +}; + +struct MSR +{ + volatile uint delta_cts :1; + volatile uint delta_data_set_ready :1; + volatile uint trailing_edge_ring_indicator :1; + volatile uint delta_data_carrier_detect :1; + volatile uint clear_to_send :1; + volatile uint data_set_ready :1; + volatile uint ring_indicator :1; + volatile uint data_carrier_detect :1; +}; + +/* this structure is only for internal usage */ +struct _usart_device +{ + register_t buffer; // also used as LSB for divisor latch + struct IER IER; + struct IIR IIR; + struct FCR FCR; + struct LCR LCR; + struct MCR MCR; + struct LSR LSR; + struct MSR MSR; + register_t scratch; +}; + + +// setup functions (wrappers) +void usart_set_baudrate(uint16_t baudrate); +void usart_set_parity(int mode); +void usart_set_stop_bits(int count); +void usart_set_word_length(int length); +void usart_set_autoflow(int mode); + +inline void usart_init(uint16_t baudrate, int parity, int stop_bits); + +void usart_transmit(uint8_t data); +uint8_t usart_receive(); + +int usart_write(uint8_t *data, size_t size); +int usart_read(uint8_t *buffer, size_t count); + +#endif // __USART__H__ |