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Commit b396d9

2026-04-16 11:23:26 Bob Green: -/-
programming/examples/duart.md ..
@@ 8,35 8,72 @@
```
#### gcc
```c
- /* Duart Register Addresses */
- #define duart_base ((unsigned char*) 0xad0001)
-
- #define duart_mr1a ((unsigned char*) duart_base)
- #define duart_mr2a ((unsigned char*) duart_base)
- #define duart_sra ((unsigned char*) duart_base+2)
- #define duart_csra ((unsigned char*) duart_base+2)
- #define duart_cra ((unsigned char*) duart_base+4)
- #define duart_rba ((unsigned char*) duart_base+6)
- #define duart_tba ((unsigned char*) duart_base+6)
- #define duart_ipcr ((unsigned char*) duart_base+8)
- #define duart_acr ((unsigned char*) duart_base+8)
- #define duart_isr ((unsigned char*) duart_base+10)
- #define duart_imr ((unsigned char*) duart_base+10)
- #define duart_cur ((unsigned char*) duart_base+12)
- #define duart_ctur ((unsigned char*) duart_base+12)
- #define duart_clr ((unsigned char*) duart_base+14)
- #define duart_ctlr ((unsigned char*) duart_base+14)
- #define duart_mr1a ((unsigned char*) duart_base+16)
- #define duart_mr2b ((unsigned char*) duart_base+16)
- #define duart_srb ((unsigned char*) duart_base+18)
- #define duart_csrb ((unsigned char*) duart_base+18)
- #define duart_crb ((unsigned char*) duart_base+20)
- #define duart_rbb ((unsigned char*) duart_base+22)
- #define duart_tbb ((unsigned char*) duart_base+22)
- #define duart_ivr ((unsigned char*) duart_base+24)
- #define duart_opcr ((unsigned char*) duart_base+26)
- #define duart_start_counter ((unsigned char*) duart_base+28)
- #define duart_opr_set ((unsigned char*) duart_base+28)
- #define duart_stop_counter ((unsigned char*) duart_base+30)
- #define duart_opr_reset ((unsigned char*) duart_base+30)
+ /* Duart Register Base Addresses */
+ #define duart_base ((volatile uint8_t*) 0xad0001)
+
+ #define duart_mr1a ((volatile uint8_t*) duart_base)
+ #define duart_mr2a ((volatile uint8_t*) duart_base)
+ #define duart_sra ((volatile uint8_t*) duart_base+2)
+ #define duart_csra ((volatile uint8_t*) duart_base+2)
+ #define duart_cra ((volatile uint8_t*) duart_base+4)
+ #define duart_rba ((volatile uint8_t*) duart_base+6)
+ #define duart_tba ((volatile uint8_t*) duart_base+6)
+ #define duart_ipcr ((volatile uint8_t*) duart_base+8)
+ #define duart_acr ((volatile uint8_t*) duart_base+8)
+ #define duart_isr ((volatile uint8_t*) duart_base+10)
+ #define duart_imr ((volatile uint8_t*) duart_base+10)
+ #define duart_cur ((volatile uint8_t*) duart_base+12)
+ #define duart_ctur ((volatile uint8_t*) duart_base+12)
+ #define duart_clr ((volatile uint8_t*) duart_base+14)
+ #define duart_ctlr ((volatile uint8_t*) duart_base+14)
+ #define duart_mr1b ((volatile uint8_t*) duart_base+16)
+ #define duart_mr2b ((volatile uint8_t*) duart_base+16)
+ #define duart_srb ((volatile uint8_t*) duart_base+18)
+ #define duart_csrb ((volatile uint8_t*) duart_base+18)
+ #define duart_crb ((volatile uint8_t*) duart_base+20)
+ #define duart_rbb ((volatile uint8_t*) duart_base+22)
+ #define duart_tbb ((volatile uint8_t*) duart_base+22)
+ #define duart_ivr ((volatile uint8_t*) duart_base+24)
+ #define duart_opcr ((volatile uint8_t*) duart_base+26)
+ #define duart_start_counter ((volatile uint8_t*) duart_base+28)
+ #define duart_opr_set ((volatile uint8_t*) duart_base+28)
+ #define duart_stop_counter ((volatile uint8_t*) duart_base+30)
+ #define duart_opr_reset ((volatile uint8_t*) duart_base+30)
+
+ /* Status Register A and B */
+ #define SR_RXRDY 0x01
+ #define SR_RX_READY 0x01
+ #define SR_TXRDY 0x04
+ #define SR_TX_READY 0x04
+ #define SR_TX_EMPTY 0x08
+
+ /* Command Register A and B */
+ #define CR_NOP 0x00
+ #define CR_RESET_MR_PTR 0x10
+ #define CR_RESET_RX 0x20
+ #define CR_RESET_TX 0x30
+ #define CR_RESET_ERROR 0x40
+ #define CR_RESET_BREAK 0x50
+ #define CR_START_BREAK 0x60
+ #define CR_STOP_BREAK 0x70
+ #define CR_SET_EXT_RX 0x80
+ #define CR_CLEAR_EXT_RX 0x90
+ #define CR_SET_EXT_TX 0xa0
+ #define CR_CLEAR_EXT_TX 0xb0
+ #define CR_STANDBY_MODE 0xc0
+ #define CR_ACTIVE_MODE 0xd0
+
+ #define CR_ENABLE_TX 0x04
+ #define CR_DISABLE_TX 0x08
+ #define CR_ENABLE_RX 0x01
+ #define CR_DISABLE_RX 0x02
+
+ /* Interrupt Status Register */
+ #define GLOBAL_ISR_TXRDY_A 0x01
+ #define GLOBAL_ISR_RXRDY_A 0x02
+ #define GLOBAL_ISR_TXRDY_B 0x10
+ #define GLOBAL_ISR_RXRDY_B 0x20
+
+ #define ISR_TX_READY 0x01
+ #define ISR_RX_READY 0x02
```
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