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software/i2c: add i2c_scan command.

This commit is contained in:
Florent Kermarrec 2020-11-10 09:47:28 +01:00
parent ce9f24748f
commit a5bdfe3f4c
3 changed files with 44 additions and 1 deletions
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30
litex/soc/software/bios/cmds/cmd_i2c.c
View File

@ -61,7 +61,7 @@ define_command(i2c_write, i2c_write_handler, "Write over I2C", I2C_CMDS);
#endif
/**
* Command "i2crd"
* Command "i2c_read"
*
* Read I2C slave memory using 7-bit slave address and 8-bit memory address.
*
@ -119,3 +119,31 @@ static void i2c_read_handler(int nb_params, char **params)
}
define_command(i2c_read, i2c_read_handler, "Read over I2C", I2C_CMDS);
#endif
/**
* Command "i2c_scan"
*
* Scan for available I2C devices
*
*/
#ifdef CSR_I2C_BASE
static void i2c_scan_handler(int nb_params, char **params)
{
int slave_addr;
printf("\n 0 1 2 3 4 5 6 7 8 9 a b c d e f");
for (slave_addr = 0; slave_addr < 0x80; slave_addr++) {
if (slave_addr % 0x10 == 0) {
printf("\n0x%02x ", (slave_addr/0x10) * 0x10);
}
if (i2c_poll(slave_addr)) {
printf("+ ");
} else {
printf(". ");
}
}
printf("\n");
}
define_command(i2c_scan, i2c_scan_handler, "Scan for I2C slaves", I2C_CMDS);
#endif

1
litex/soc/software/include/base/i2c.h
View File

@ -18,6 +18,7 @@ extern "C" {
void i2c_reset(void);
bool i2c_write(unsigned char slave_addr, unsigned char addr, const unsigned char *data, unsigned int len);
bool i2c_read(unsigned char slave_addr, unsigned char addr, unsigned char *data, unsigned int len, bool send_stop);
bool i2c_poll(unsigned char slave_addr);
#ifdef __cplusplus
}

14
litex/soc/software/libbase/i2c.c
View File

@ -201,4 +201,18 @@ bool i2c_write(unsigned char slave_addr, unsigned char addr, const unsigned char
return true;
}
/*
* Poll I2C slave at given address, return true if it sends an ACK back
*/
bool i2c_poll(unsigned char slave_addr)
{
bool result;
i2c_start();
result = i2c_transmit_byte(I2C_ADDR_RD(slave_addr));
i2c_stop();
return result;
}
#endif /* CSR_I2C_BASE */