repo2/firmware/pokey/uart.c @ 461
| 46 | markw | #include "uart.h"
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#include "regs.h"
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void actions();
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int USART_Data_Needed()
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{
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int needed = 0==(0x10&(*zpu_pokey_irqen));
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if (needed)
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{
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*zpu_pokey_irqen = 0x28;
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*zpu_pokey_irqen = 0x38;
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}
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return needed;
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}
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int USART_Data_Ready()
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{
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int ready = 0==(0x20&(*zpu_pokey_irqen));
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if (ready)
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{
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*zpu_pokey_irqen = 0x18;
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*zpu_pokey_irqen = 0x38;
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}
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return ready;
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}
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void USART_Init( u08 value )
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{
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// value is pokey div + 6
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*zpu_pokey_skctl = 0;
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wait_us(10);
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USART_Receive_Mode(); // turn of reset and listen to commands
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*zpu_pokey_audctl = 0x78; // linked channels, fast clocked
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*zpu_pokey_audf1 = 0x00;
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*zpu_pokey_audf0 = value-6;
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*zpu_pokey_audf3 = 0x00;
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*zpu_pokey_audf2 = value-6;
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*zpu_pokey_irqen = 0x00;
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*zpu_pokey_irqen = 0x38;
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}
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void USART_Transmit_Byte( unsigned char data )
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{
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*zpu_pokey_serout = data;
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// wait until next byte is needed
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while (!USART_Data_Needed());
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}
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unsigned char USART_Receive_Byte( void )
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{
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// wait for data
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while (!USART_Data_Ready())
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{
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actions();
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}
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u08 res = *zpu_pokey_serout; //serin at same address
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return res;
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}
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void USART_Transmit_Mode()
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{
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*zpu_pokey_skctl = 0x23; // 010 for transmission
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*zpu_pokey_skrest = 0xff;
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*zpu_pokey_irqen = 0x28; // clear data needed
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*zpu_pokey_irqen = 0x38;
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}
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void USART_Receive_Mode()
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{
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*zpu_pokey_skctl = 0x13; // 001 for receiving
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*zpu_pokey_skrest = 0xff;
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}
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int USART_Framing_Error()
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{
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| 374 | markw | if (0x80&(*zpu_pokey_skctl))
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| 46 | markw | {
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return 0;
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}
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else
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{
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return 1;
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}
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}
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void USART_Wait_Transmit_Complete()
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{
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while (1)
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{
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int ready = 0==(0x08&(*zpu_pokey_irqen));
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if (ready)
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{
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*zpu_pokey_irqen = 0x30;
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*zpu_pokey_irqen = 0x38;
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return;
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}
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}
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}
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int USART_Command_Line()
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{
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return (1&(*zpu_sio));
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}
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