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| memory_map [2021/09/05 18:12] – [Misc. peripherals] simer | memory_map [2021/09/23 22:48] – [UART] pulkomandy | ||
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| If the attribute bit is 1, there is no inversion, and the data bit is output as is. | If the attribute bit is 1, there is no inversion, and the data bit is output as is. | ||
| - | |||
| - | ===== IO special functions and usage ===== | ||
| - | |||
| - | FIXME this does not match the info from the V.Smile motion schematics (see [[IO]] page). Where does this info come from (except from bmx spreadsheet) and which is correct? | ||
| - | |||
| - | * IOA15: act | ||
| - | * IOA14-0: 15 bit RGB | ||
| - | * IOA15: SCK | ||
| - | * IOA14: SDA | ||
| - | * IOA13: SWS | ||
| - | * IOA12: CKV | ||
| - | * IOA11: FM | ||
| - | * IOA10: FP | ||
| - | * IOA9: LP | ||
| - | * IOA8: CP | ||
| - | * IOA7-0: D7-0 | ||
| - | * IOC15: SPI clock | ||
| - | * IOC14: RX | ||
| - | * IOC13: TX | ||
| - | * IOC12: SPI SSB | ||
| - | * IOC11: TFT Clock | ||
| - | * IOC10: timebase 1 | ||
| - | * IOC9: TAPWM | ||
| - | * IOC8: VSYNC | ||
| - | * IOC7: HSYNC | ||
| - | * IOC1: timebase 2 / external clock 1 input | ||
| - | * IOC0: TBPWM / external clock 2 input | ||
| Line 306: | Line 279: | ||
| * 115200: FF F1 | * 115200: FF F1 | ||
| + | Before using the UART, the corresponding PINs need to be configured properly. IOC13 and IOC14 must be set to " | ||
| + | The example below also forces CTS A (IOC8) low, allowing the first controller port to transmit data. Normally this would only be done after receiving an RTS from said controller. | ||
| + | |||
| + | // Enable controller CTS | ||
| + | *PORTC_DIR = 0x89c0; | ||
| + | *PORTC_ATTR = 0x89c0; | ||
| + | *PORTC_DATA = 0xf77f; | ||
| + | |||
| + | // Enable Uart RX (controller input) | ||
| + | *UART_BAUDRATE_LOW = 0xA0; | ||
| + | *UART_BAUDRATE_HIGH = 0xFE; | ||
| + | *UART_CONTROL = 0xc3; | ||
| + | *UART_STATUS = 3; | ||
| + | |||
| + | *PORTC_SPECIAL |= 0x6000; // UART Tx and Rx in " | ||
| + | *PORTC_ATTR |= 0x6000; | ||
| + | *PORTC_DIR |= 0x4000; | ||
| + | |||
| + | Reading from the UART then is quite simple: | ||
| + | |||
| + | * Wait until the status register indicates Rx ready (bit 0) | ||
| + | * When Rx is ready, read the Rx data register to get the byte | ||
| + | |||
| + | For transmitting, | ||
| ====== SPI ====== | ====== SPI ====== | ||
