A better UART driver
The PL011 actually has a bunch more registers, and adding offsets to construct pointers to access them is error-prone and hard to read. Plus, some of them are bit fields which would be nice to access in a structured way.
| Offset | Register name | Width |
|---|---|---|
| 0x00 | DR | 12 |
| 0x04 | RSR | 4 |
| 0x18 | FR | 9 |
| 0x20 | ILPR | 8 |
| 0x24 | IBRD | 16 |
| 0x28 | FBRD | 6 |
| 0x2c | LCR_H | 8 |
| 0x30 | CR | 16 |
| 0x34 | IFLS | 6 |
| 0x38 | IMSC | 11 |
| 0x3c | RIS | 11 |
| 0x40 | MIS | 11 |
| 0x44 | ICR | 11 |
| 0x48 | DMACR | 3 |
- There are also some ID registers which have been omitted for brevity.