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  1/*
  2BCM2835 ARM Peripherals
  3
  4Datasheet:
  5https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf
  6
  7
  8      3V3 Power  *---[ 01 | 02 ]---*  5V Power
  9    GPIO2 (SDA)  *---[ 03 | 04 ]---*  5V Power
 10    GPIO3 (SCL)  *---[ 05 | 06 ]---*  Ground
 11 GPIO4 (GPCLK0)  *---[ 07 | 08 ]---*  GPIO14 (TXD)
 12         Ground  *---[ 09 | 10 ]---*  GPIO15 (RXD)
 13         GPIO17  *---[ 11 | 12 ]---*  GPIO18 (PCM_CLK)
 14         GPIO27  *---[ 13 | 14 ]---*  Ground
 15         GPIO22  *---[ 15 | 16 ]---*  GPIO23
 16      3V3 Power  *---[ 17 | 18 ]---*  GPIO24
 17  GPIO10 (MOSI)  *---[ 19 | 20 ]---*  Ground
 18   GPIO9 (MISO)  *---[ 21 | 22 ]---*  GPIO25
 19  GPIO11 (SCLK)  *---[ 23 | 24 ]---*  GPIO8 (CE0)
 20         Ground  *---[ 25 | 26 ]---*  GPIO7 (CE1)
 21  GPIO0 (ID_SD)  *---[ 27 | 28 ]---*  GPIO1 (ID_SC)
 22          GPIO5  *---[ 29 | 30 ]---*  Ground
 23          GPIO6  *---[ 31 | 32 ]---*  GPIO12 (PWM0)
 24  GPIO13 (PWM1)  *---[ 33 | 34 ]---*  Ground
 25GPIO19 (PCM_FS)  *---[ 35 | 36 ]---*  GPIO16
 26         GPIO26  *---[ 37 | 38 ]---*  GPIO20 (PCM_DIN)
 27         Ground  *---[ 39 | 40 ]---*  GPIO21 (PCM_DOUT)
 28
 29
 30gpiochip0 - 54 lines:
 31
 32---------------------   ---------------------   ---------------------
 33line 00: ID_SDA         line 18: GPIO18         line 36: SD1_DATA0
 34line 01: ID_SCL         line 19: GPIO19         line 37: SD1_DATA1
 35line 02: GPIO2          line 20: GPIO20         line 38: SD1_DATA2
 36line 03: GPIO3          line 21: GPIO21         line 39: SD1_DATA3
 37line 04: GPIO4          line 22: GPIO22         line 40: PWM0_OUT
 38line 05: GPIO5          line 23: GPIO23         line 41: PWM1_OUT
 39line 06: GPIO6          line 24: GPIO24         line 42: ETH_CLK
 40line 07: GPIO7          line 25: GPIO25         line 43: WIFI_CLK
 41line 08: GPIO8          line 26: GPIO26         line 44: SDA0
 42line 09: GPIO9          line 27: GPIO27         line 45: SCL0
 43line 10: GPIO10         line 28: NC             line 46: SMPS_SCL
 44line 11: GPIO11         line 29: LAN_RUN_BOOT   line 47: SMPS_SDA
 45line 12: GPIO12         line 30: CTS0           line 48: SD_CLK_R
 46line 13: GPIO13         line 31: RTS0           line 49: SD_CMD_R
 47line 14: GPIO14         line 32: TXD0           line 50: SD_DATA0_R
 48line 15: GPIO15         line 33: RXD0           line 51: SD_DATA1_R
 49line 16: GPIO16         line 34: SD1_CLK        line 52: SD_DATA2_R
 50line 17: GPIO17         line 35: SD1_CMD        line 53: SD_DATA3_R
 51---------------------   ---------------------   ---------------------
 52*/
 53
 54#ifndef LIB_BCM2835_H
 55#define LIB_BCM2835_H
 56
 57#define BCM_FSEL0   0
 58#define BCM_FSEL1   1
 59#define BCM_FSEL2   2
 60#define BCM_FSEL3   3
 61#define BCM_FSEL4   4
 62#define BCM_FSEL5   5
 63#define BCM_SET0    7
 64#define BCM_SET1    8
 65#define BCM_CLR0    10
 66#define BCM_CLR1    11
 67#define BCM_LEV0    13
 68#define BCM_LEV1    14
 69#define BCM_EDS0    16
 70#define BCM_EDS1    17
 71#define BCM_REN0    19
 72#define BCM_REN1    20
 73#define BCM_FEN0    22
 74#define BCM_FEN1    23
 75#define BCM_HEN0    25
 76#define BCM_HEN1    26
 77#define BCM_LEN0    28
 78#define BCM_LEN1    29
 79#define BCM_AREN0   31
 80#define BCM_AREN1   32
 81#define BCM_AFEN0   34
 82#define BCM_AFEN1   35
 83#define BCM_PUD     37
 84#define BCM_PUDCLK0 38
 85#define BCM_PUDCLK1 39
 86
 87#define LOW  0
 88#define HIGH 1
 89
 90typedef unsigned char u8_t;
 91typedef unsigned int u32_t;
 92
 93typedef enum {
 94  FSEL_IN   = 0x00,
 95  FSEL_OUT  = 0x01,
 96  FSEL_ALT0 = 0x04,
 97  FSEL_ALT1 = 0x05,
 98  FSEL_ALT2 = 0x06,
 99  FSEL_ALT3 = 0x07,
100  FSEL_ALT4 = 0x03,
101  FSEL_ALT5 = 0x02,
102} bcm_fsel_e;
103
104typedef enum {
105  PUD_OFF  = 0x00,
106  PUD_DOWN = 0x01,
107  PUD_UP   = 0x02,
108} bcm_pud_e;
109
110int bcm_init(void);
111void bcm_fsel(u32_t pin, bcm_fsel_e fsel);
112void bcm_set(u32_t pin);
113void bcm_clr(u32_t pin);
114int bcm_lev(u32_t pin);
115void bcm_pud(u32_t pin, bcm_pud_e pud);
116
117void bcm_write(u32_t pin, int level);
118int bcm_read(u32_t pin);
119void bcm_pulse(u32_t pin, int level, u32_t sleep);
120
121#ifdef LIB_BCM2835_IMPL
122
123#include <stdio.h>
124#include <fcntl.h>
125#include <unistd.h>
126#include <sys/mman.h>
127
128static volatile u32_t *reg = MAP_FAILED;
129
130u32_t __bcm_bank(u32_t pin) {
131  return (pin >> 5);
132}
133
134int bcm_init(void) {
135  int fd = open("/dev/gpiomem", O_RDWR | O_SYNC);
136  if (fd < 0) {
137    fprintf(stderr, "Failed to open() /dev/gpiomem!\n");
138    return -1;
139  }
140  reg = (u32_t *) mmap(NULL, 0xB4, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
141  close(fd);
142  if (reg == MAP_FAILED) {
143    fprintf(stderr, "Bad, mmap() failed!\n");
144    return -1;
145  }
146  return 0;
147}
148
149void bcm_fsel(u32_t pin, bcm_fsel_e fsel) {
150  int idx = BCM_FSEL0 + (pin / 10);
151  int shift = 3 * (pin % 10);
152  reg[idx] = (reg[idx] & ~(7 << shift)) | (fsel << shift);
153}
154
155void bcm_set(u32_t pin) {
156  int idx = BCM_SET0 + __bcm_bank(pin);
157  reg[idx] = (1 << (pin & 0x1F));
158}
159
160void bcm_clr(u32_t pin) {
161  int idx = BCM_CLR0 + __bcm_bank(pin);
162  reg[idx] = (1 << (pin & 0x1F));
163}
164
165int bcm_lev(u32_t pin) {
166  int idx = BCM_LEV0 + __bcm_bank(pin);
167  return (reg[idx] & (1 << (pin & 0x1F))) != 0;
168}
169
170void bcm_pud(u32_t pin, bcm_pud_e pud) {
171  reg[BCM_PUD] = pud;
172  usleep(20);
173  reg[BCM_PUDCLK0 + __bcm_bank(pin)] = (1 << (pin & 0x1F));
174  usleep(20);
175  reg[BCM_PUD] = PUD_OFF;
176  reg[BCM_PUDCLK0 + __bcm_bank(pin)] = 0x00;
177}
178
179void bcm_write(u32_t pin, int level) {
180  level == HIGH
181    ? bcm_set(pin)
182    : bcm_clr(pin);
183}
184
185int bcm_read(u32_t pin) {
186  return bcm_lev(pin);
187}
188
189void bcm_pulse(u32_t pin, int level, u32_t sleep) {
190  level == HIGH
191    ? bcm_set(pin)
192    : bcm_clr(pin);
193  usleep(sleep);
194  level != HIGH
195    ? bcm_set(pin)
196    : bcm_clr(pin);
197}
198
199#endif /* LIB_BCM2835_IMPL */
200#endif /* LIB_BCM2835_H */