mmdolze
c23077b722
- Correct check for mmap errors (closes #3604495). - Add 40x4 support (for displays with two controllers). - Update the documentation.
38 lines
929 B
C
38 lines
929 B
C
#ifndef HD_LCDRPI_H
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#define HD_LCDRPI_H
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#include "lcd.h" /* for Driver */
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/* initialize this particular driver */
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int hd_init_rpi(Driver *drvthis);
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/**
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* rpi_gpio_map is addressed through the hd44780_private_data struct. Data
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* stored here is used for mapping physical GPIO pins to BCM2835 gpio. */
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struct rpi_gpio_map {
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int en;
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int en2;
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int rs;
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int d7;
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int d6;
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int d5;
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int d4;
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};
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/** Peripheral base address of the BCM2835 */
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#define BCM2835_PERI_BASE 0x20000000
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/** GPIO register start address */
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#define GPIO_BASE BCM2835_PERI_BASE + 0x200000
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/** Length of register space */
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#define GPIO_BLOCK_SIZE 180
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/** The Pi has 32 GPIO pins */
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#define GPIO_PINS 32
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/** Setup a GPIO pin as input */
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#define INP_GPIO(g) *(gpio_map+((g)/10)) &= ~(7<<(((g)%10)*3))
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/** Sets or clears a GPIO pin */
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#define SET_GPIO(g,a) *(gpio_map+((a)?7:10))=1<<((g)%32);
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#endif // HD_LCDRPI_H
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