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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 32 |
1 files changed, 21 insertions, 11 deletions
@@ -90,19 +90,29 @@ Peripherals The simulator implements emulation of two peripherals for now. The firs is simple serial port (UART) which transmission -(Tx) support only for now. It provides two registers, the -first is status port. Bit 0 is reserved for notification -that UART is busy and cannot accept next character. -The second register is actual Tx buffer. The LSB byte -of writtent word is transmitted to terminal window. -Definition of peripheral base address and registers -offsets follows. - +(Tx) support only for now. Actual version implements only +two registers, the 'SERP_TX_ST_REG' is trasmit status register. +Bit 0 signals by value 1 that UART is ready and can +accept next character to be sent. +The second register 'SERP_TX_DATA_REG' is actual Tx buffer. +The LSB byte of writtent word is transmitted to terminal +window. Definition of peripheral base address and registers +offsets follows including reserve for the future Rx port +implementation. ``` #define SERIAL_PORT_BASE 0xffffc000 -#define SERP_ST_REG_o 0x00 -#define SERP_ST_REG_TX_BUSY_m 0x1 -#define SERP_TX_REG_o 0x04 + +#define SERP_RX_ST_REG_o 0x00 +#define SERP_RX_ST_REG_READY_m 0x1 +#define SERP_RX_ST_REG_IE_m 0x2 + +#define SERP_RX_DATA_REG_o 0x04 + +#define SERP_TX_ST_REG_o 0x08 +#define SERP_TX_ST_REG_READY_m 0x1 +#define SERP_TX_ST_REG_IE_m 0x2 + +#define SERP_TX_DATA_REG_o 0x0c ``` The another peripheral allows to set three byte values |