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Fix I2C access code

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While the current implementation works for what it is actually used, it
is broken when trying to do larger transfers.

The length field in the control register has a size of 4 bits. In every
transfer, length+1 bytes are read. Thus, each transfer is limited to a
maximum of 16 bytes. Add a check for the length, and write the correct
value to the register.

Also update the loop in "sfp_send_data" to properly increment the output
register. Remove the unused special case for a length of 128 bytes.
This commit is contained in:
Jan Hoffmann
2026-03-28 18:14:15 +01:00
parent df498b0879
commit efe0c282ba
2 changed files with 11 additions and 10 deletions
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rtlplayground.c
+2 -2
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@@ -832,9 +832,9 @@ uint8_t sfp_read_reg(uint8_t slot, uint8_t reg)
{
if (reg & 0x80) { // Configure SFP readings address (0x51) as I2C device address
reg &= 0x7f;
REG_WRITE(RTL837X_REG_I2C_CTRL, 0x00, 0x1 << (I2C_MEM_ADDR_WIDTH-16) | 1, 0x51 >> 5, (0x51 << 3) & 0xff);
REG_WRITE(RTL837X_REG_I2C_CTRL, 0x00, 0x1 << (I2C_MEM_ADDR_WIDTH-16) | 0, 0x51 >> 5, (0x51 << 3) & 0xff);
} else {
REG_WRITE(RTL837X_REG_I2C_CTRL, 0x00, 0x1 << (I2C_MEM_ADDR_WIDTH-16) | 1, 0x50 >> 5, (0x50 << 3) & 0xff);
REG_WRITE(RTL837X_REG_I2C_CTRL, 0x00, 0x1 << (I2C_MEM_ADDR_WIDTH-16) | 0, 0x50 >> 5, (0x50 << 3) & 0xff);
}
reg_read_m(RTL837X_REG_I2C_CTRL);