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raspi-gpio.c
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raspi-gpio.c
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/*
Reads GPIO state and dumps to console.
Allows GPIO hacking to set and get GPIO state.
Author: James Adams
*/
#include <stdio.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <time.h>
#define GPIO_BASE_OFFSET 0x00200000
#define DRIVE_UNSET -1
#define DRIVE_LOW 0
#define DRIVE_HIGH 1
#define PULL_UNSET -1
#define PULL_NONE 0
#define PULL_DOWN 1
#define PULL_UP 2
#define FUNC_UNSET -1
#define FUNC_IP 0
#define FUNC_OP 1
#define FUNC_ALT(x) (2 + (x))
#define FUNC_A0 FUNC_ALT(0)
#define FUNC_A1 FUNC_ALT(1)
#define FUNC_A2 FUNC_ALT(2)
#define FUNC_A3 FUNC_ALT(3)
#define FUNC_A4 FUNC_ALT(4)
#define FUNC_A5 FUNC_ALT(5)
/* 2835 register offsets */
#define GPFSEL0 0
#define GPFSEL1 1
#define GPFSEL2 2
#define GPFSEL3 3
#define GPFSEL4 4
#define GPFSEL5 5
#define GPSET0 7
#define GPSET1 8
#define GPCLR0 10
#define GPCLR1 11
#define GPLEV0 13
#define GPLEV1 14
#define GPPUD 37
#define GPPUDCLK0 38
#define GPPUDCLK1 39
/* 2711 has a different mechanism for pin pull-up/down/enable */
#define GPPUPPDN0 57 /* Pin pull-up/down for pins 15:0 */
#define GPPUPPDN1 58 /* Pin pull-up/down for pins 31:16 */
#define GPPUPPDN2 59 /* Pin pull-up/down for pins 47:32 */
#define GPPUPPDN3 60 /* Pin pull-up/down for pins 57:48 */
struct gpio_chip
{
const char *name;
uint32_t reg_base;
uint32_t reg_size;
unsigned int gpio_count;
unsigned int fsel_count;
const char *info_header;
const char **alt_names;
const int *default_pulls;
int (*get_level)(struct gpio_chip *chip, unsigned int gpio);
int (*get_fsel)(struct gpio_chip *chip, unsigned int gpio);
int (*get_pull)(struct gpio_chip *chip, unsigned int gpio);
int (*set_level)(struct gpio_chip *chip, unsigned int gpio, int level);
int (*set_fsel)(struct gpio_chip *chip, unsigned int gpio, int fsel);
int (*set_pull)(struct gpio_chip *chip, unsigned int gpio, int pull);
int (*next_reg)(int reg);
volatile uint32_t *base;
};
static int bcm2835_get_level(struct gpio_chip *chip, unsigned int gpio);
static int bcm2835_get_fsel(struct gpio_chip *chip, unsigned int gpio);
static int bcm2835_get_pull(struct gpio_chip *chip, unsigned int gpio);
static int bcm2835_set_level(struct gpio_chip *chip, unsigned int gpio, int level);
static int bcm2835_set_fsel(struct gpio_chip *chip, unsigned int gpio, int fsel);
static int bcm2835_set_pull(struct gpio_chip *chip, unsigned int gpio, int pull);
static int bcm2835_next_reg(int reg);
static int bcm2711_get_pull(struct gpio_chip *chip, unsigned int gpio);
static int bcm2711_set_pull(struct gpio_chip *chip, unsigned int gpio, int pull);
static int bcm2711_next_reg(int reg);
static const char *gpio_alt_names_2835[54*6] =
{
"SDA0" , "SA5" , "PCLK" , "AVEOUT_VCLK" , "AVEIN_VCLK" , 0 ,
"SCL0" , "SA4" , "DE" , "AVEOUT_DSYNC" , "AVEIN_DSYNC", 0 ,
"SDA1" , "SA3" , "LCD_VSYNC" , "AVEOUT_VSYNC" , "AVEIN_VSYNC", 0 ,
"SCL1" , "SA2" , "LCD_HSYNC" , "AVEOUT_HSYNC" , "AVEIN_HSYNC", 0 ,
"GPCLK0" , "SA1" , "DPI_D0" , "AVEOUT_VID0" , "AVEIN_VID0" , "ARM_TDI" ,
"GPCLK1" , "SA0" , "DPI_D1" , "AVEOUT_VID1" , "AVEIN_VID1" , "ARM_TDO" ,
"GPCLK2" , "SOE_N_SE" , "DPI_D2" , "AVEOUT_VID2" , "AVEIN_VID2" , "ARM_RTCK" ,
"SPI0_CE1_N", "SWE_N_SRW_N", "DPI_D3" , "AVEOUT_VID3" , "AVEIN_VID3" , 0 ,
"SPI0_CE0_N", "SD0" , "DPI_D4" , "AVEOUT_VID4" , "AVEIN_VID4" , 0 ,
"SPI0_MISO" , "SD1" , "DPI_D5" , "AVEOUT_VID5" , "AVEIN_VID5" , 0 ,
"SPI0_MOSI" , "SD2" , "DPI_D6" , "AVEOUT_VID6" , "AVEIN_VID6" , 0 ,
"SPI0_SCLK" , "SD3" , "DPI_D7" , "AVEOUT_VID7" , "AVEIN_VID7" , 0 ,
"PWM0" , "SD4" , "DPI_D8" , "AVEOUT_VID8" , "AVEIN_VID8" , "ARM_TMS" ,
"PWM1" , "SD5" , "DPI_D9" , "AVEOUT_VID9" , "AVEIN_VID9" , "ARM_TCK" ,
"TXD0" , "SD6" , "DPI_D10" , "AVEOUT_VID10" , "AVEIN_VID10", "TXD1" ,
"RXD0" , "SD7" , "DPI_D11" , "AVEOUT_VID11" , "AVEIN_VID11", "RXD1" ,
"FL0" , "SD8" , "DPI_D12" , "CTS0" , "SPI1_CE2_N" , "CTS1" ,
"FL1" , "SD9" , "DPI_D13" , "RTS0" , "SPI1_CE1_N" , "RTS1" ,
"PCM_CLK" , "SD10" , "DPI_D14" , "I2CSL_SDA_MOSI", "SPI1_CE0_N" , "PWM0" ,
"PCM_FS" , "SD11" , "DPI_D15" , "I2CSL_SCL_SCLK", "SPI1_MISO" , "PWM1" ,
"PCM_DIN" , "SD12" , "DPI_D16" , "I2CSL_MISO" , "SPI1_MOSI" , "GPCLK0" ,
"PCM_DOUT" , "SD13" , "DPI_D17" , "I2CSL_CE_N" , "SPI1_SCLK" , "GPCLK1" ,
"SD0_CLK" , "SD14" , "DPI_D18" , "SD1_CLK" , "ARM_TRST" , 0 ,
"SD0_CMD" , "SD15" , "DPI_D19" , "SD1_CMD" , "ARM_RTCK" , 0 ,
"SD0_DAT0" , "SD16" , "DPI_D20" , "SD1_DAT0" , "ARM_TDO" , 0 ,
"SD0_DAT1" , "SD17" , "DPI_D21" , "SD1_DAT1" , "ARM_TCK" , 0 ,
"SD0_DAT2" , "TE0" , "DPI_D22" , "SD1_DAT2" , "ARM_TDI" , 0 ,
"SD0_DAT3" , "TE1" , "DPI_D23" , "SD1_DAT3" , "ARM_TMS" , 0 ,
"SDA0" , "SA5" , "PCM_CLK" , "FL0" , 0 , 0 ,
"SCL0" , "SA4" , "PCM_FS" , "FL1" , 0 , 0 ,
"TE0" , "SA3" , "PCM_DIN" , "CTS0" , 0 , "CTS1" ,
"FL0" , "SA2" , "PCM_DOUT" , "RTS0" , 0 , "RTS1" ,
"GPCLK0" , "SA1" , "RING_OCLK" , "TXD0" , 0 , "TXD1" ,
"FL1" , "SA0" , "TE1" , "RXD0" , 0 , "RXD1" ,
"GPCLK0" , "SOE_N_SE" , "TE2" , "SD1_CLK" , 0 , 0 ,
"SPI0_CE1_N", "SWE_N_SRW_N", 0 , "SD1_CMD" , 0 , 0 ,
"SPI0_CE0_N", "SD0" , "TXD0" , "SD1_DAT0" , 0 , 0 ,
"SPI0_MISO" , "SD1" , "RXD0" , "SD1_DAT1" , 0 , 0 ,
"SPI0_MOSI" , "SD2" , "RTS0" , "SD1_DAT2" , 0 , 0 ,
"SPI0_SCLK" , "SD3" , "CTS0" , "SD1_DAT3" , 0 , 0 ,
"PWM0" , "SD4" , 0 , "SD1_DAT4" , "SPI2_MISO" , "TXD1" ,
"PWM1" , "SD5" , "TE0" , "SD1_DAT5" , "SPI2_MOSI" , "RXD1" ,
"GPCLK1" , "SD6" , "TE1" , "SD1_DAT6" , "SPI2_SCLK" , "RTS1" ,
"GPCLK2" , "SD7" , "TE2" , "SD1_DAT7" , "SPI2_CE0_N" , "CTS1" ,
"GPCLK1" , "SDA0" , "SDA1" , "TE0" , "SPI2_CE1_N" , 0 ,
"PWM1" , "SCL0" , "SCL1" , "TE1" , "SPI2_CE2_N" , 0 ,
"SDA0" , "SDA1" , "SPI0_CE0_N", 0 , 0 , "SPI2_CE1_N",
"SCL0" , "SCL1" , "SPI0_MISO" , 0 , 0 , "SPI2_CE0_N",
"SD0_CLK" , "FL0" , "SPI0_MOSI" , "SD1_CLK" , "ARM_TRST" , "SPI2_SCLK" ,
"SD0_CMD" , "GPCLK0" , "SPI0_SCLK" , "SD1_CMD" , "ARM_RTCK" , "SPI2_MOSI" ,
"SD0_DAT0" , "GPCLK1" , "PCM_CLK" , "SD1_DAT0" , "ARM_TDO" , 0 ,
"SD0_DAT1" , "GPCLK2" , "PCM_FS" , "SD1_DAT1" , "ARM_TCK" , 0 ,
"SD0_DAT2" , "PWM0" , "PCM_DIN" , "SD1_DAT2" , "ARM_TDI" , 0 ,
"SD0_DAT3" , "PWM1" , "PCM_DOUT" , "SD1_DAT3" , "ARM_TMS" , 0
};
static const char *gpio_alt_names_2711[54*6] =
{
"SDA0" , "SA5" , "PCLK" , "SPI3_CE0_N" , "TXD2" , "SDA6" ,
"SCL0" , "SA4" , "DE" , "SPI3_MISO" , "RXD2" , "SCL6" ,
"SDA1" , "SA3" , "LCD_VSYNC" , "SPI3_MOSI" , "CTS2" , "SDA3" ,
"SCL1" , "SA2" , "LCD_HSYNC" , "SPI3_SCLK" , "RTS2" , "SCL3" ,
"GPCLK0" , "SA1" , "DPI_D0" , "SPI4_CE0_N" , "TXD3" , "SDA3" ,
"GPCLK1" , "SA0" , "DPI_D1" , "SPI4_MISO" , "RXD3" , "SCL3" ,
"GPCLK2" , "SOE_N_SE" , "DPI_D2" , "SPI4_MOSI" , "CTS3" , "SDA4" ,
"SPI0_CE1_N", "SWE_N_SRW_N", "DPI_D3" , "SPI4_SCLK" , "RTS3" , "SCL4" ,
"SPI0_CE0_N", "SD0" , "DPI_D4" , "I2CSL_CE_N" , "TXD4" , "SDA4" ,
"SPI0_MISO" , "SD1" , "DPI_D5" , "I2CSL_SDI_MISO", "RXD4" , "SCL4" ,
"SPI0_MOSI" , "SD2" , "DPI_D6" , "I2CSL_SDA_MOSI", "CTS4" , "SDA5" ,
"SPI0_SCLK" , "SD3" , "DPI_D7" , "I2CSL_SCL_SCLK", "RTS4" , "SCL5" ,
"PWM0_0" , "SD4" , "DPI_D8" , "SPI5_CE0_N" , "TXD5" , "SDA5" ,
"PWM0_1" , "SD5" , "DPI_D9" , "SPI5_MISO" , "RXD5" , "SCL5" ,
"TXD0" , "SD6" , "DPI_D10" , "SPI5_MOSI" , "CTS5" , "TXD1" ,
"RXD0" , "SD7" , "DPI_D11" , "SPI5_SCLK" , "RTS5" , "RXD1" ,
0 , "SD8" , "DPI_D12" , "CTS0" , "SPI1_CE2_N" , "CTS1" ,
0 , "SD9" , "DPI_D13" , "RTS0" , "SPI1_CE1_N" , "RTS1" ,
"PCM_CLK" , "SD10" , "DPI_D14" , "SPI6_CE0_N" , "SPI1_CE0_N" , "PWM0_0" ,
"PCM_FS" , "SD11" , "DPI_D15" , "SPI6_MISO" , "SPI1_MISO" , "PWM0_1" ,
"PCM_DIN" , "SD12" , "DPI_D16" , "SPI6_MOSI" , "SPI1_MOSI" , "GPCLK0" ,
"PCM_DOUT" , "SD13" , "DPI_D17" , "SPI6_SCLK" , "SPI1_SCLK" , "GPCLK1" ,
"SD0_CLK" , "SD14" , "DPI_D18" , "SD1_CLK" , "ARM_TRST" , "SDA6" ,
"SD0_CMD" , "SD15" , "DPI_D19" , "SD1_CMD" , "ARM_RTCK" , "SCL6" ,
"SD0_DAT0" , "SD16" , "DPI_D20" , "SD1_DAT0" , "ARM_TDO" , "SPI3_CE1_N" ,
"SD0_DAT1" , "SD17" , "DPI_D21" , "SD1_DAT1" , "ARM_TCK" , "SPI4_CE1_N" ,
"SD0_DAT2" , 0 , "DPI_D22" , "SD1_DAT2" , "ARM_TDI" , "SPI5_CE1_N" ,
"SD0_DAT3" , 0 , "DPI_D23" , "SD1_DAT3" , "ARM_TMS" , "SPI6_CE1_N" ,
"SDA0" , "SA5" , "PCM_CLK" , 0 , "MII_A_RX_ERR" , "RGMII_MDIO" ,
"SCL0" , "SA4" , "PCM_FS" , 0 , "MII_A_TX_ERR" , "RGMII_MDC" ,
0 , "SA3" , "PCM_DIN" , "CTS0" , "MII_A_CRS" , "CTS1" ,
0 , "SA2" , "PCM_DOUT" , "RTS0" , "MII_A_COL" , "RTS1" ,
"GPCLK0" , "SA1" , 0 , "TXD0" , "SD_CARD_PRES" , "TXD1" ,
0 , "SA0" , 0 , "RXD0" , "SD_CARD_WRPROT" , "RXD1" ,
"GPCLK0" , "SOE_N_SE" , 0 , "SD1_CLK" , "SD_CARD_LED" , "RGMII_IRQ" ,
"SPI0_CE1_N", "SWE_N_SRW_N", 0 , "SD1_CMD" , "RGMII_START_STOP", 0 ,
"SPI0_CE0_N", "SD0" , "TXD0" , "SD1_DAT0" , "RGMII_RX_OK" , "MII_A_RX_ERR",
"SPI0_MISO" , "SD1" , "RXD0" , "SD1_DAT1" , "RGMII_MDIO" , "MII_A_TX_ERR",
"SPI0_MOSI" , "SD2" , "RTS0" , "SD1_DAT2" , "RGMII_MDC" , "MII_A_CRS" ,
"SPI0_SCLK" , "SD3" , "CTS0" , "SD1_DAT3" , "RGMII_IRQ" , "MII_A_COL" ,
"PWM1_0" , "SD4" , 0 , "SD1_DAT4" , "SPI0_MISO" , "TXD1" ,
"PWM1_1" , "SD5" , 0 , "SD1_DAT5" , "SPI0_MOSI" , "RXD1" ,
"GPCLK1" , "SD6" , 0 , "SD1_DAT6" , "SPI0_SCLK" , "RTS1" ,
"GPCLK2" , "SD7" , 0 , "SD1_DAT7" , "SPI0_CE0_N" , "CTS1" ,
"GPCLK1" , "SDA0" , "SDA1" , 0 , "SPI0_CE1_N" , "SD_CARD_VOLT",
"PWM0_1" , "SCL0" , "SCL1" , 0 , "SPI0_CE2_N" , "SD_CARD_PWR0",
"SDA0" , "SDA1" , "SPI0_CE0_N", 0 , 0 , "SPI2_CE1_N" ,
"SCL0" , "SCL1" , "SPI0_MISO" , 0 , 0 , "SPI2_CE0_N" ,
"SD0_CLK" , 0 , "SPI0_MOSI" , "SD1_CLK" , "ARM_TRST" , "SPI2_SCLK" ,
"SD0_CMD" , "GPCLK0" , "SPI0_SCLK" , "SD1_CMD" , "ARM_RTCK" , "SPI2_MOSI" ,
"SD0_DAT0" , "GPCLK1" , "PCM_CLK" , "SD1_DAT0" , "ARM_TDO" , "SPI2_MISO" ,
"SD0_DAT1" , "GPCLK2" , "PCM_FS" , "SD1_DAT1" , "ARM_TCK" , "SD_CARD_LED" ,
"SD0_DAT2" , "PWM0_0" , "PCM_DIN" , "SD1_DAT2" , "ARM_TDI" , 0 ,
"SD0_DAT3" , "PWM0_1" , "PCM_DOUT" , "SD1_DAT3" , "ARM_TMS" , 0 ,
};
static const char *gpio_pull_names[4] =
{
"NONE", "DOWN", "UP", "?"
};
/* 0 = none, 1 = down, 2 = up */
static const int gpio_default_pullstate_2835[54] =
{
2,2,2,2,2,2,2,2,2, /*GPIO0-8 UP*/
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /*GPIO9-27 DOWN*/
0,0, /*GPIO28-29 NONE*/
1,1,1,1, /*GPIO30-33 DOWN*/
2,2,2, /*GPIO34-36 UP*/
1,1,1,1,1,1,1, /*GPIO37-43 DOWN*/
0,0, /*GPIO44-45 NONE*/
2,2,2,2,2,2,2,2 /*GPIO46-53 UP*/
};
struct gpio_chip gpio_chip_2835 =
{
"bcm2835",
0x00200000,
0x1000,
54,
6,
"GPIO, DEFAULT PULL, ALT0, ALT1, ALT2, ALT3, ALT4, ALT5",
gpio_alt_names_2835,
gpio_default_pullstate_2835,
bcm2835_get_level,
bcm2835_get_fsel,
bcm2835_get_pull,
bcm2835_set_level,
bcm2835_set_fsel,
bcm2835_set_pull,
bcm2835_next_reg,
};
struct gpio_chip gpio_chip_2711 =
{
"bcm2711",
0x00200000,
0x1000,
54,
6,
"GPIO, DEFAULT PULL, ALT0, ALT1, ALT2, ALT3, ALT4, ALT5",
gpio_alt_names_2711,
gpio_default_pullstate_2835,
bcm2835_get_level,
bcm2835_get_fsel,
bcm2711_get_pull,
bcm2835_set_level,
bcm2835_set_fsel,
bcm2711_set_pull,
bcm2711_next_reg,
};
struct gpio_chip *chip;
void print_gpio_alts_info(struct gpio_chip *chip, int gpio)
{
int alt;
printf("%d, %s", gpio, gpio_pull_names[chip->default_pulls[gpio]]);
for (alt = 0; alt < 6; alt++)
{
const char *name = chip->alt_names[gpio * chip->fsel_count + alt];
printf(", %s", name ? name : "-");
}
printf("\n");
}
struct gpio_chip *get_gpio_chip(void)
{
struct gpio_chip *chip;
const char *revision_file = "/proc/device-tree/system/linux,revision";
uint8_t revision[4] = { 0 };
uint32_t cpu = 0;
FILE *fd;
if ((fd = fopen(revision_file, "rb")) == NULL)
{
printf("Can't open '%s'\n", revision_file);
}
else
{
if (fread(revision, 1, sizeof(revision), fd) == 4)
cpu = (revision[2] >> 4) & 0xf;
else
printf("Revision data too short\n");
fclose(fd);
}
switch (cpu)
{
case 0: /* BCM2835 */
chip = &gpio_chip_2835;
chip->reg_base = 0x20000000 + GPIO_BASE_OFFSET;
break;
case 1: /* BCM2836 */
case 2: /* BCM2837 */
chip = &gpio_chip_2835;
chip->reg_base = 0x3f000000 + GPIO_BASE_OFFSET;
break;
case 3: /* BCM2711 */
chip = &gpio_chip_2711;
chip->reg_base = 0xfe000000 + GPIO_BASE_OFFSET;
break;
case 4: /* BCM2712 */
printf("raspi-gpio is not supported on Pi 5 - use `pinctrl`\n");
exit(1);
default:
printf("Unrecognised revision code\n");
exit(1);
}
return chip;
}
const char *gpio_fsel_to_namestr(unsigned int gpio, int fsel)
{
const char *name = NULL;
static char alt_str[16];
if (gpio >= chip->gpio_count)
return NULL;
if (fsel == FUNC_IP)
return "INPUT";
else if (fsel == FUNC_OP)
return "OUTPUT";
fsel -= FUNC_A0;
if (fsel >= 0 && fsel < chip->fsel_count)
name = chip->alt_names[gpio * chip->fsel_count + fsel];
if (!name)
{
sprintf(alt_str, "alt%d", fsel);
name = alt_str;
}
return name;
}
void print_raw_gpio_regs(struct gpio_chip *chip)
{
int i = -1;
while (1)
{
int new_i = chip->next_reg(i++);
if (new_i < 0)
break;
if (new_i != i)
{
/* Change rows if needed */
if ((i & ~3) != (new_i & ~3)) /* Not on the same row */
{
if (i & 3) /* This row has been started */
printf("\n");
i = new_i & ~3;
}
}
if ((i & 3) == 0)
printf("%02x:", i * 4);
if (new_i != i)
{
/* Insert padding if needed */
printf("%*s", (new_i - i) * 9, "");
i = new_i;
}
printf(" %08x", chip->base[i]);
if ((i & 3) == 3)
printf("\n");
}
if (i & 3)
printf("\n");
}
void print_help()
{
char *name = "raspi-gpio"; /* in case we want to rename */
printf("\n");
printf("WARNING! %s set writes directly to the GPIO control registers\n", name);
printf("ignoring whatever else may be using them (such as Linux drivers) -\n");
printf("it is designed as a debug tool, only use it if you know what you\n");
printf("are doing and at your own risk!\n");
printf("\n");
printf("The %s tool is designed to help hack / debug BCM283x GPIO.\n", name);
printf("Running %s with the help argument prints this help.\n", name);
printf("%s can get and print the state of a GPIO (or all GPIOs)\n", name);
printf("and can be used to set the function, pulls and value of a GPIO.\n");
printf("%s must be run as root.\n", name);
printf("Use:\n");
printf(" %s [<n>] get [GPIO]\n", name);
printf("OR\n");
printf(" %s [<n>] set <GPIO> [options]\n", name);
printf("OR\n");
printf(" %s [<n>] funcs [GPIO]\n", name);
printf("OR\n");
printf(" %s [<n>] raw\n", name);
printf("\n");
printf("<n> is an option GPIO chip index (default 0)\n");
printf("GPIO is a comma-separated list of pin numbers or ranges (without spaces),\n");
printf("e.g. 4 or 18-21 or 7,9-11\n");
printf("Note that omitting [GPIO] from %s get prints all GPIOs.\n", name);
printf("%s funcs will dump all the possible GPIO alt funcions in CSV format\n", name);
printf("or if [GPIO] is specified the alternate funcs just for that specific GPIO.\n");
printf("Valid [options] for %s set are:\n", name);
printf(" ip set GPIO as input\n");
printf(" op set GPIO as output\n");
printf(" a0-a5 set GPIO to alternate function alt0-alt5\n");
printf(" pu set GPIO in-pad pull up\n");
printf(" pd set GPIO in-pad pull down\n");
printf(" pn set GPIO pull none (no pull)\n");
printf(" dh set GPIO to drive to high (1) level (only valid if set to be an output)\n");
printf(" dl set GPIO to drive low (0) level (only valid if set to be an output)\n");
printf("Examples:\n");
printf(" %s get Prints state of all GPIOs one per line\n", name);
printf(" %s get 20 Prints state of GPIO20\n", name);
printf(" %s get 20,21 Prints state of GPIO20 and GPIO21\n", name);
printf(" %s set 20 a5 Set GPIO20 to ALT5 function (GPCLK0)\n", name);
printf(" %s set 20 pu Enable GPIO20 ~50k in-pad pull up\n", name);
printf(" %s set 20 pd Enable GPIO20 ~50k in-pad pull down\n", name);
printf(" %s set 20 op Set GPIO20 to be an output\n", name);
printf(" %s set 20 dl Set GPIO20 to output low/zero (must already be set as an output)\n", name);
printf(" %s set 20 ip pd Set GPIO20 to input with pull down\n", name);
printf(" %s set 35 a0 pu Set GPIO35 to ALT0 function (SPI_CE1_N) with pull up\n", name);
printf(" %s set 20 op pn dh Set GPIO20 to ouput with no pull and driving high\n", name);
}
int gpio_get(unsigned int gpio)
{
const char *name;
int level;
int fsel;
int pull;
fsel = chip->get_fsel(chip, gpio);
name = gpio_fsel_to_namestr(gpio, fsel);
level = chip->get_level(chip, gpio);
printf("GPIO %d: level=%d", gpio, level);
if (fsel >= FUNC_A0)
printf(" alt=%d", fsel - FUNC_A0);
printf(" func=%s", name);
pull = chip->get_pull(chip, gpio);
if (pull != PULL_UNSET)
printf(" pull=%s", gpio_pull_names[pull & 3]);
printf("\n");
return 0;
}
int gpio_set(unsigned int gpio, int fsparam, int drive, int pull)
{
if (fsparam != FUNC_UNSET)
chip->set_fsel(chip, gpio, fsparam);
if (drive != DRIVE_UNSET)
{
if (chip->get_fsel(chip, gpio) == FUNC_OP)
{
chip->set_level(chip, gpio, drive);
}
else
{
printf("Can't set pin value, not an output\n");
return 1;
}
}
if (pull != PULL_UNSET)
return chip->set_pull(chip, gpio, pull);
return 0;
}
int main(int argc, char *argv[])
{
int fd;
int ret;
/* arg parsing */
int set = 0;
int get = 0;
int funcs = 0;
int raw = 0;
int pull = PULL_UNSET;
int fsparam = FUNC_UNSET;
int drive = DRIVE_UNSET;
uint32_t gpiomask[2] = { 0, 0 }; /* Enough for 0-53 */
int all_pins = 0;
const char *cmd;
argv++;
argc--;
if (!argc)
{
printf("No arguments given - try \"raspi-gpio help\"\n");
return 1;
}
cmd = *(argv++);
argc--;
if (strcmp(cmd, "help") == 0)
{
print_help();
return 0;
}
chip = get_gpio_chip();
/* argc 2 or greater, next arg must be set, get or help */
get = strcmp(cmd, "get") == 0;
set = strcmp(cmd, "set") == 0;
funcs = strcmp(cmd, "funcs") == 0;
raw = strcmp(cmd, "raw") == 0;
if (!set && !get && !funcs && !raw)
{
printf("Unknown argument \"%s\" try \"raspi-gpio help\"\n", cmd);
return 1;
}
if ((get || funcs) && (argc > 1))
{
printf("Too many arguments\n");
return 1;
}
if (!argc && set)
{
printf("Need GPIO number to set\n");
return 1;
}
if (argc) /* expect pin number(s) next */
{
char *p = *(argv++);
argc--;
while (p)
{
int pin, pin2, len;
ret = sscanf(p, "%d%n", &pin, &len);
if (ret != 1 || pin >= chip->gpio_count)
break;
p += len;
if (*p == '-')
{
p++;
ret = sscanf(p, "%d%n", &pin2, &len);
if (ret != 1 || pin2 >= chip->gpio_count)
break;
if (pin2 < pin)
{
int tmp = pin2;
pin2 = pin;
pin = tmp;
}
p += len;
}
else
{
pin2 = pin;
}
while (pin <= pin2)
{
gpiomask[pin/32] |= (1 << (pin % 32));
pin++;
}
if (*p == '\0')
{
p = NULL;
}
else
{
if (*p != ',')
break;
p++;
}
}
if (p)
{
printf("Unknown GPIO \"%s\"\n", p);
return 1;
}
}
if (set && !argc)
{
printf("Nothing to set\n");
return 1;
}
/* parse remaining args */
while (argc)
{
const char *arg = *(argv++);
argc--;
if (strcmp(arg, "dh") == 0)
drive = DRIVE_HIGH;
else if (strcmp(arg, "dl") == 0)
drive = DRIVE_LOW;
else if (strcmp(arg, "ip") == 0)
fsparam = FUNC_IP;
else if (strcmp(arg, "op") == 0)
fsparam = FUNC_OP;
else if (strcmp(arg, "a0") == 0)
fsparam = FUNC_A0;
else if (strcmp(arg, "a1") == 0)
fsparam = FUNC_A1;
else if (strcmp(arg, "a2") == 0)
fsparam = FUNC_A2;
else if (strcmp(arg, "a3") == 0)
fsparam = FUNC_A3;
else if (strcmp(arg, "a4") == 0)
fsparam = FUNC_A4;
else if (strcmp(arg, "a5") == 0)
fsparam = FUNC_A5;
else if (strcmp(arg, "pu") == 0)
pull = PULL_UP;
else if (strcmp(arg, "pd") == 0)
pull = PULL_DOWN;
else if (strcmp(arg, "pn") == 0)
pull = PULL_NONE;
else
{
printf("Unknown argument \"%s\"\n", arg);
return 1;
}
}
if (fsparam >= FUNC_A0 && (fsparam - FUNC_A0) >= chip->fsel_count)
{
printf("Alt function a%d out of range\n", fsparam - FUNC_A0);
return 1;
}
/* end arg parsing */
all_pins = !(gpiomask[0] | gpiomask[1]);
if (funcs)
{
int pin;
printf("GPIO, DEFAULT PULL, ALT0, ALT1, ALT2, ALT3, ALT4, ALT5\n");
for (pin = 0; pin < chip->gpio_count; pin++)
{
if (all_pins || gpiomask[pin / 32] & (1 << (pin % 32)))
print_gpio_alts_info(chip, pin);
}
goto deprecation_check;
}
/* Check for /dev/gpiomem, else we need root access for /dev/mem */
if ((fd = open ("/dev/gpiomem", O_RDWR | O_SYNC | O_CLOEXEC) ) >= 0)
{
chip->base = (uint32_t *)mmap(0, chip->reg_size,
PROT_READ|PROT_WRITE, MAP_SHARED,
fd, 0);
}
else
{
if (geteuid())
{
printf("Must be root\n");
return 1;
}
if ((fd = open ("/dev/mem", O_RDWR | O_SYNC | O_CLOEXEC) ) < 0)
{
printf("Unable to open /dev/mem: %s\n", strerror (errno));
return 1;
}
chip->base = (uint32_t *)mmap(0, chip->reg_size,
PROT_READ|PROT_WRITE, MAP_SHARED,
fd, chip->reg_base);
}
if (chip->base == (uint32_t *)-1)
{
printf("mmap (GPIO) failed: %s\n", strerror (errno));
return 1;
}
if (set || get)
{
int pin;
for (pin = 0; pin < chip->gpio_count; pin++)
{
if (all_pins)
{
if (pin==0) printf("BANK0 (GPIO 0 to 27):\n");
if (pin==28) printf("BANK1 (GPIO 28 to 45):\n");
if (pin==46) printf("BANK2 (GPIO 46 to 53):\n");
}
else if (!(gpiomask[pin / 32] & (1 << (pin % 32))))
{
continue;
}
if (get)
{
if (gpio_get(pin))
return 1;
}
else
{
if (gpio_set(pin, fsparam, drive, pull))
return 1;
}
}
}
if (raw)
print_raw_gpio_regs(chip);
deprecation_check:
if (isatty(STDOUT_FILENO))
{
fd = open("/tmp/raspi-gpio-deprecated", O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
if (fd >= 0)
{
printf("[ raspi-gpio is deprecated - try `pinctrl` instead ]\n");
close(fd);
}
}
return 0;
}
static int bcm2835_get_level(struct gpio_chip *chip, unsigned int gpio)
{
if (gpio >= chip->gpio_count)
return -1;
return (chip->base[GPLEV0 + (gpio / 32)] >> (gpio % 32)) & 1;
}
static int bcm2835_get_fsel(struct gpio_chip *chip, unsigned int gpio)
{
/* GPFSEL0-5 with 10 sels per reg, 3 bits per sel (so bits 0:29 used) */
uint32_t reg = GPFSEL0 + (gpio / 10);
uint32_t lsb = (gpio % 10) * 3;
if (gpio < chip->gpio_count)
{
switch ((chip->base[reg] >> lsb) & 7)
{
case 0: return FUNC_IP;
case 1: return FUNC_OP;
case 2: return FUNC_A5;
case 3: return FUNC_A4;
case 4: return FUNC_A0;
case 5: return FUNC_A1;
case 6: return FUNC_A2;
case 7: return FUNC_A3;
}
}
return -1;
}
static int bcm2835_get_pull(struct gpio_chip *chip, unsigned int gpio)
{
/* This is a write-only mechanism */
return PULL_UNSET;
}
static int bcm2835_set_level(struct gpio_chip *chip, unsigned int gpio, int level)
{
if (gpio >= chip->gpio_count)
return -1;
chip->base[(level ? GPSET0 : GPCLR0) + (gpio / 32)] = (1 << (gpio % 32));
return 0;
}
static int bcm2835_set_fsel(struct gpio_chip *chip, unsigned int gpio, int fsel)
{
/* GPFSEL0-5 with 10 sels per reg, 3 bits per sel (so bits 0:29 used) */
uint32_t reg = GPFSEL0 + (gpio / 10);
uint32_t lsb = (gpio % 10) * 3;
switch (fsel)
{
case FUNC_IP: fsel = 0; break;
case FUNC_OP: fsel = 1; break;
case FUNC_A0: fsel = 4; break;
case FUNC_A1: fsel = 5; break;
case FUNC_A2: fsel = 6; break;
case FUNC_A3: fsel = 7; break;
case FUNC_A4: fsel = 3; break;
case FUNC_A5: fsel = 2; break;
default:
return -1;
}
if (gpio < chip->gpio_count)
{
chip->base[reg] = (chip->base[reg] & ~(0x7 << lsb)) | (fsel << lsb);
return 0;
}
return -1;
}
static int bcm2835_set_pull(struct gpio_chip *chip, unsigned int gpio, int pull)
{
int clkreg = GPPUDCLK0 + (gpio / 32);
int clkbit = 1 << (gpio % 32);
if (gpio >= chip->gpio_count)
return -1;
if (pull < 0 || pull > 2) return -1;
chip->base[GPPUD] = pull;
usleep(10);
chip->base[clkreg] = clkbit;
usleep(10);
chip->base[GPPUD] = 0;
usleep(10);
chip->base[clkreg] = 0;
usleep(10);
return 0;
}
static int bcm2835_next_reg(int reg)
{
if (reg < 0)
return 0;
else if (reg == GPPUDCLK1)
return -1;
return reg + 1;
}
static int bcm2711_get_pull(struct gpio_chip *chip, unsigned int gpio)
{
int reg = GPPUPPDN0 + (gpio / 16);
int lsb = (gpio % 16) * 2;
if (gpio >= chip->gpio_count)
return -1;
switch ((chip->base[reg] >> lsb) & 3)
{
case 0: return PULL_NONE;
case 1: return PULL_UP;
case 2: return PULL_DOWN;
}
return -1;
}
static int bcm2711_set_pull(struct gpio_chip *chip, unsigned int gpio, int pull)
{
int reg = GPPUPPDN0 + (gpio / 16);
int lsb = (gpio % 16) * 2;
if (gpio >= chip->gpio_count)
return -1;
switch (pull)
{
case PULL_NONE:
pull = 0;
break;
case PULL_UP:
pull = 1;
break;
case PULL_DOWN:
pull = 2;
break;
default:
return -1;
}
chip->base[reg] = (chip->base[reg] & ~(3 << lsb)) | (pull << lsb);
return 0;
}
static int bcm2711_next_reg(int reg)
{
/* Skip over non-GPIO registers */
if (reg < 0)
return 0;
else if (reg == GPPUPPDN3)
return -1;
else if (reg == GPPUDCLK1)
return GPPUPPDN0;
return reg + 1;
}