Alwyn Nixon-Lloyd / Mbed 2 deprecated LQ11S31G

This is a short program to try to use the mbed to bit-bash a parrallel ttl interface to an LCD panel. The panel is an NEC NL 6448 AC 32-01

Dependencies:   mbed

FastIO.h@0:ea31197a0074, 2011-05-13 (annotated)

Committer:
zarquin
Date:
Fri May 13 11:22:56 2011 +0000
Revision:
0:ea31197a0074
First release.  Doesn\t work yet

Who changed what in which revision?

UserRevisionLine numberNew contents of line
zarquin 0:ea31197a0074 1 #ifndef __FAST_IO_H
zarquin 0:ea31197a0074 2 #define __FAST_IO_H
zarquin 0:ea31197a0074 3
zarquin 0:ea31197a0074 4 #include "mbed.h"
zarquin 0:ea31197a0074 5
zarquin 0:ea31197a0074 6 // Super-fast DigitalOut-like class for mbed
zarquin 0:ea31197a0074 7 // by Igor Skochinsky
zarquin 0:ea31197a0074 8
zarquin 0:ea31197a0074 9 // includes FastOut, FastPortOut and MaskedPortOut classes
zarquin 0:ea31197a0074 10 // usage:
zarquin 0:ea31197a0074 11 // FastOut<LED2> led2;
zarquin 0:ea31197a0074 12 // FastPortOut<Port0, LED_MASK> ledport2;
zarquin 0:ea31197a0074 13 // MaskedPortOut<Port0, LED_MASK> ledport3;
zarquin 0:ea31197a0074 14 // led2 = 1;
zarquin 0:ea31197a0074 15 // ledport2 = LED_MASK;
zarquin 0:ea31197a0074 16 // ledport3 = LED_MASK;
zarquin 0:ea31197a0074 17 // MaskedPortOut works the same way as FastPortOut, but it pre-sets the pin mask so that write can be done in one operation
zarquin 0:ea31197a0074 18 // this makes things faster but you can't control other pins of the port, even with other classes
zarquin 0:ea31197a0074 19
zarquin 0:ea31197a0074 20
zarquin 0:ea31197a0074 21 // pin definitions in PinNames.h start from LPC_GPIO0_BASE for P0_0 and there are 32 pins to a port (0 to 31)
zarquin 0:ea31197a0074 22 // Thus:
zarquin 0:ea31197a0074 23 // pin = LPC_GPIO0_BASE + port * 32 + bit
zarquin 0:ea31197a0074 24 // port = (pin - LPC_GPIO0_BASE) / 32
zarquin 0:ea31197a0074 25 // bit = (pin - LPC_GPIO0_BASE) % 32
zarquin 0:ea31197a0074 26
zarquin 0:ea31197a0074 27 #define PORTNO(pin) (((pin) - P0_0)/32)
zarquin 0:ea31197a0074 28 #define BITNO(pin) (((pin) - P0_0)%32)
zarquin 0:ea31197a0074 29
zarquin 0:ea31197a0074 30 // calculate the GPIO port definition for the pin
zarquin 0:ea31197a0074 31 // we rely on the fact that port structs are 0x20 bytes apart
zarquin 0:ea31197a0074 32 #define PORTDEF(pin) ((LPC_GPIO_TypeDef*)(LPC_GPIO0_BASE + PORTNO(pin)*0x20))
zarquin 0:ea31197a0074 33
zarquin 0:ea31197a0074 34 #define PORTDEFPORT(port) ((LPC_GPIO_TypeDef*)(LPC_GPIO0_BASE + port*0x20))
zarquin 0:ea31197a0074 35
zarquin 0:ea31197a0074 36 // calculate the mask for the pin's bit in the port
zarquin 0:ea31197a0074 37 #define PINMASK(pin) (1UL << BITNO(pin))
zarquin 0:ea31197a0074 38
zarquin 0:ea31197a0074 39 // each port takes two PINSEL registers (8 bytes or 64 bits)
zarquin 0:ea31197a0074 40 // so there are 16 pins per PINSEL
zarquin 0:ea31197a0074 41 #define PINSELREG(pin) (*(volatile uint32_t*)(LPC_PINCON_BASE + 4*(((pin) - P0_0)/16)))
zarquin 0:ea31197a0074 42 #define PINSELMASK(pin, v) (v << (((pin - P0_0)%16)*2) )
zarquin 0:ea31197a0074 43
zarquin 0:ea31197a0074 44 // usage: FastOut<LED2> led2;
zarquin 0:ea31197a0074 45 // then use the same assignment operators as with DigitalOut
zarquin 0:ea31197a0074 46 template <PinName pin> class FastOut
zarquin 0:ea31197a0074 47 {
zarquin 0:ea31197a0074 48 public:
zarquin 0:ea31197a0074 49 FastOut()
zarquin 0:ea31197a0074 50 {
zarquin 0:ea31197a0074 51 // set PINSEL bits to 0b00 (GPIO)
zarquin 0:ea31197a0074 52 PINSELREG(pin) &= ~PINSELMASK(pin, 3);
zarquin 0:ea31197a0074 53 // set FIODIR bit to 1 (output)
zarquin 0:ea31197a0074 54 PORTDEF(pin)->FIODIR |= PINMASK(pin);
zarquin 0:ea31197a0074 55 }
zarquin 0:ea31197a0074 56 void write(int value)
zarquin 0:ea31197a0074 57 {
zarquin 0:ea31197a0074 58 if ( value )
zarquin 0:ea31197a0074 59 PORTDEF(pin)->FIOSET = PINMASK(pin);
zarquin 0:ea31197a0074 60 else
zarquin 0:ea31197a0074 61 PORTDEF(pin)->FIOCLR = PINMASK(pin);
zarquin 0:ea31197a0074 62 }
zarquin 0:ea31197a0074 63 int read()
zarquin 0:ea31197a0074 64 {
zarquin 0:ea31197a0074 65 return PORTDEF(pin)->FIOPIN & PINMASK(pin) != 0;
zarquin 0:ea31197a0074 66 }
zarquin 0:ea31197a0074 67 FastOut& operator= (int value) { write(value); return *this; };
zarquin 0:ea31197a0074 68 FastOut& operator= (FastOut& rhs) { return write(rhs.read()); };
zarquin 0:ea31197a0074 69 operator int() { return read(); };
zarquin 0:ea31197a0074 70 };
zarquin 0:ea31197a0074 71
zarquin 0:ea31197a0074 72 #define PINSELREG(pin) (*(volatile uint32_t*)(LPC_PINCON_BASE + 4*(((pin) - P0_0)/16)))
zarquin 0:ea31197a0074 73 #define PINSELMASK(pin, v) (v << (((pin - P0_0)%16)*2) )
zarquin 0:ea31197a0074 74
zarquin 0:ea31197a0074 75 // usage: FastPortOut<Port0, mask> led2;
zarquin 0:ea31197a0074 76 // then use the same assignment operators as with DigitalOut
zarquin 0:ea31197a0074 77 template <enum PortName port, uint32_t mask = 0xFFFFFFFF> class FastPortOut
zarquin 0:ea31197a0074 78 {
zarquin 0:ea31197a0074 79 public:
zarquin 0:ea31197a0074 80 FastPortOut()
zarquin 0:ea31197a0074 81 {
zarquin 0:ea31197a0074 82 // init pins selected by the mask
zarquin 0:ea31197a0074 83 uint32_t pin = LPC_GPIO0_BASE + port * 32;
zarquin 0:ea31197a0074 84 for ( uint32_t pinmask = mask; pinmask !=0; pinmask >>= 1 )
zarquin 0:ea31197a0074 85 {
zarquin 0:ea31197a0074 86 if ( pinmask & 1 )
zarquin 0:ea31197a0074 87 {
zarquin 0:ea31197a0074 88 // set PINSEL bits to 0b00 (GPIO)
zarquin 0:ea31197a0074 89 PINSELREG(pin) &= ~PINSELMASK(pin, 3);
zarquin 0:ea31197a0074 90 // set FIODIR bit to 1 (output)
zarquin 0:ea31197a0074 91 PORTDEF(pin)->FIODIR |= PINMASK(pin);
zarquin 0:ea31197a0074 92 }
zarquin 0:ea31197a0074 93 pin++;
zarquin 0:ea31197a0074 94 }
zarquin 0:ea31197a0074 95 }
zarquin 0:ea31197a0074 96 void write(int value)
zarquin 0:ea31197a0074 97 {
zarquin 0:ea31197a0074 98 PORTDEFPORT(port)->FIOSET = value & mask;
zarquin 0:ea31197a0074 99 PORTDEFPORT(port)->FIOCLR = ~value & mask;
zarquin 0:ea31197a0074 100 }
zarquin 0:ea31197a0074 101 int read()
zarquin 0:ea31197a0074 102 {
zarquin 0:ea31197a0074 103 return PORTDEFPORT(port)->FIOPIN & mask;
zarquin 0:ea31197a0074 104 }
zarquin 0:ea31197a0074 105 FastPortOut& operator= (int value) { write(value); return *this; };
zarquin 0:ea31197a0074 106 FastPortOut& operator= (FastPortOut& rhs) { return write(rhs.read()); };
zarquin 0:ea31197a0074 107 operator int() { return read(); };
zarquin 0:ea31197a0074 108 };
zarquin 0:ea31197a0074 109
zarquin 0:ea31197a0074 110 // usage: MaskedPortOut<Port0, mask> led2;
zarquin 0:ea31197a0074 111 // then use the same assignment operators as with DigitalOut
zarquin 0:ea31197a0074 112 template <enum PortName port, uint32_t mask = 0xFFFFFFFF> class MaskedPortOut
zarquin 0:ea31197a0074 113 {
zarquin 0:ea31197a0074 114 public:
zarquin 0:ea31197a0074 115 MaskedPortOut()
zarquin 0:ea31197a0074 116 {
zarquin 0:ea31197a0074 117 // init pins selected by the mask
zarquin 0:ea31197a0074 118 uint32_t pin = LPC_GPIO0_BASE + port * 32;
zarquin 0:ea31197a0074 119 for ( uint32_t pinmask = mask; pinmask !=0; pinmask >>= 1 )
zarquin 0:ea31197a0074 120 {
zarquin 0:ea31197a0074 121 if ( pinmask & 1 )
zarquin 0:ea31197a0074 122 {
zarquin 0:ea31197a0074 123 // set PINSEL bits to 0b00 (GPIO)
zarquin 0:ea31197a0074 124 PINSELREG(pin) &= ~PINSELMASK(pin, 3);
zarquin 0:ea31197a0074 125 // set FIODIR bit to 1 (output)
zarquin 0:ea31197a0074 126 PORTDEF(pin)->FIODIR |= PINMASK(pin);
zarquin 0:ea31197a0074 127 }
zarquin 0:ea31197a0074 128 pin++;
zarquin 0:ea31197a0074 129 }
zarquin 0:ea31197a0074 130 // set mask
zarquin 0:ea31197a0074 131 PORTDEFPORT(port)->FIOMASK = mask;
zarquin 0:ea31197a0074 132 }
zarquin 0:ea31197a0074 133 void write(int value)
zarquin 0:ea31197a0074 134 {
zarquin 0:ea31197a0074 135 PORTDEFPORT(port)->FIOPIN = value;
zarquin 0:ea31197a0074 136 }
zarquin 0:ea31197a0074 137 int read()
zarquin 0:ea31197a0074 138 {
zarquin 0:ea31197a0074 139 return PORTDEFPORT(port)->FIOPIN;
zarquin 0:ea31197a0074 140 }
zarquin 0:ea31197a0074 141 MaskedPortOut& operator= (int value) { write(value); return *this; };
zarquin 0:ea31197a0074 142 MaskedPortOut& operator= (MaskedPortOut& rhs) { return write(rhs.read()); };
zarquin 0:ea31197a0074 143 operator int() { return read(); };
zarquin 0:ea31197a0074 144 };
zarquin 0:ea31197a0074 145
zarquin 0:ea31197a0074 146 #endif