1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
/**
* @file drivers/gdisp/Nokia6610GE12/gdisp_lld_board_olimexsam7ex256.h
* @brief GDISP Graphic Driver subsystem board interface for the Olimex SAM7-EX256 board.
*
* @addtogroup GDISP
* @{
*/
#ifndef _GDISP_LLD_BOARD_H
#define _GDISP_LLD_BOARD_H
// ******************************************************
// Pointers to AT91SAM7X256 peripheral data structures
// ******************************************************
volatile AT91PS_PIO pPIOA = AT91C_BASE_PIOA;
volatile AT91PS_PIO pPIOB = AT91C_BASE_PIOB;
volatile AT91PS_SPI pSPI = AT91C_BASE_SPI0;
volatile AT91PS_PMC pPMC = AT91C_BASE_PMC;
volatile AT91PS_PDC pPDC = AT91C_BASE_PDC_SPI0;
/**
* @brief Initialise the board for the display.
* @notes Performs the following functions:
* 1. initialise the spi port used by your display
* 2. initialise the reset pin (initial state not-in-reset)
* 3. initialise the chip select pin (initial state not-active)
* 4. initialise the backlight pin (initial state back-light off)
*
* @notapi
*/
static inline void init_board(void) {
// *********************************************************************************************
// InitSpi( )
//
// Sets up SPI channel 0 for communications to Nokia 6610 LCD Display
//
// I/O ports used: PA2 = LCD Reset (set to low to reset)
// PA12 = LCD chip select (set to low to select the LCD chip)
// PA16 = SPI0_MISO Master In - Slave Out (not used in LCD interface)
// PA17 = SPI0_MOSI Master Out - Slave In pin (Serial Data to LCD slave)
// PA18 = SPI0_SPCK Serial Clock (to LCD slave)
// PB20 = backlight control (normally PWM control, 1 = full on)
//
// *********************************************************************************************}
/* This code should really use the ChibiOS driver for these functions */
// Pin for backlight
pPIOB->PIO_CODR = PIOB_LCD_BL_MASK; // Set PB20 to LOW
pPIOB->PIO_OER = PIOB_LCD_BL_MASK; // Configure PB20 as output
// Reset pin
pPIOA->PIO_SODR = PIOA_LCD_RESET_MASK; // Set PA2 to HIGH
pPIOA->PIO_OER = PIOA_LCD_RESET_MASK; // Configure PA2 as output
// CS pin - this seems to be ignored
// pPIOA->PIO_SODR = 1<<12; // Set PA2 to HIGH
// pPIOA->PIO_OER = 1<<12; // Configure PA2 as output
// Init SPI0
// Disable the following pins from PIO control (will be used instead by the SPI0 peripheral)
// BIT12 = PA12 -> SPI0_NPCS0 chip select
// BIT16 = PA16 -> SPI0_MISO Master In - Slave Out (not used in LCD interface)
// BIT17 = PA17 -> SPI0_MOSI Master Out - Slave In pin (Serial Data to LCD slave)
// BIT18 = PA18 -> SPI0_SPCK Serial Clock (to LCD slave)
pPIOA->PIO_PDR = (1<<12) | (1<<16) | (1<<17) | (1<<18);
pPIOA->PIO_ASR = (1<<12) | (1<<16) | (1<<17) | (1<<18);
pPIOA->PIO_BSR = 0;
//enable the clock of SPI
pPMC->PMC_PCER = 1 << AT91C_ID_SPI0;
// Fixed mode
pSPI->SPI_CR = 0x81; //SPI Enable, Sowtware reset
pSPI->SPI_CR = 0x01; //SPI Enable
//pSPI->SPI_MR = 0xE0019; //Master mode, fixed select, disable decoder, FDIV=1 (MCK), PCS=1110
pSPI->SPI_MR = 0xE0011; //Master mode, fixed select, disable decoder, FDIV=0 (MCK), PCS=1110
//pSPI->SPI_CSR[0] = 0x01010C11; //9bit, CPOL=1, ClockPhase=0, SCLK = 48Mhz/32*12 = 125kHz
pSPI->SPI_CSR[0] = 0x01010311; //9bit, CPOL=1, ClockPhase=0, SCLK = 48Mhz/8 = 6MHz if using commented MR line above
}
/**
* @brief Set or clear the lcd reset pin.
*
* @param[in] state TRUE = lcd in reset, FALSE = normal operation
*
* @notapi
*/
static inline void setpin_reset(bool_t state) {
if (state)
palClearPad(IOPORT1, PIOA_LCD_RESET);
else
palSetPad(IOPORT1, PIOA_LCD_RESET);
}
/**
* @brief Set the lcd back-light level.
* @note For now 0% turns the backlight off, anything else the backlight is on.
* While the hardware supports PWM backlight control, we are not using it
* yet.
*
* @param[in] percent 0 to 100%
*
* @notapi
*/
static inline void set_backlight(uint8_t percent) {
if (percent)
palSetPad(IOPORT2, PIOB_LCD_BL);
else
palClearPad(IOPORT2, PIOB_LCD_BL);
}
/**
* @brief Take exclusive control of the bus
*
* @notapi
*/
static inline void acquire_bus(void) {
/* Nothing to do for this board as the LCD is the only device on the SPI port */
}
/**
* @brief Release exclusive control of the bus
*
* @notapi
*/
static inline void release_bus(void) {
// Nothing to do for this board as the LCD is the only device on the SPI port
}
/**
* @brief Send an 8 bit command to the lcd.
*
* @param[in] cmd The command to send
*
* @notapi
*/
static inline void write_cmd(uint16_t cmd) {
// wait for the previous transfer to complete
while((pSPI->SPI_SR & AT91C_SPI_TXEMPTY) == 0);
// send the command
pSPI->SPI_TDR = cmd & 0xFF;
}
/**
* @brief Send an 8 bit data to the lcd.
*
* @param[in] data The data to send
*
* @notapi
*/
static inline void write_data(uint16_t data) {
// wait for the previous transfer to complete
while((pSPI->SPI_SR & AT91C_SPI_TXEMPTY) == 0);
// send the data
pSPI->SPI_TDR = data | 0x0100;
}
#if GDISP_HARDWARE_READPIXEL || GDISP_HARDWARE_SCROLL || defined(__DOXYGEN__)
/**
* @brief Read data from the lcd.
*
* @return The data from the lcd
*
* @notapi
*/
static inline uint16_t read_data(void) {
#error "gdispNokia6610GE12: GDISP_HARDWARE_READPIXEL and GDISP_HARDWARE_SCROLL are not supported on this board"
return 0;
}
#endif
#endif /* _GDISP_LLD_BOARD_H */
/** @} */
|
