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I2CBUS: Calculate I2C-settings as compiletime instead at runtime.

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We can reduce the i2c-settings to just one byte, and this new const value
can directly be used by the I2C-peripheral without additional computation.
This saves 1-xdata load and a lot of bit-shifting.

I see a codesize savings of +200 bytes.
This commit is contained in:
René van Dorst committed 2026-09-20 11:25:34 +02:00
1 parent b92fba870c
commit f65d14f452
5 files changed
+59 -91
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boot.c
+3 -2
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@@ -397,8 +397,9 @@ void setup_i2c(void) __banked
// HW Control register, enable I2C depending on PIN configuration
reg_read_m(RTL837X_PIN_MUX_1);
for (uint8_t sfp = 0; sfp < machine.n_sfp; sfp++) {
const uint8_t scl_bus = i2c_bus_from_scl_pin(machine.sfp_port[sfp].i2c.scl);
const uint8_t sda_bus = i2c_bus_from_sda_pin(machine.sfp_port[sfp].i2c.sda);
uint8_t i2c = machine.sfp_port[sfp].i2c;
uint8_t scl_bus = (i2c >> 5) & 0x03;
uint8_t sda_bus = (i2c >> 2) & 0x07;
print_string("Configuring I2C for SFP idx="); print_byte(sfp); print_string(" SCL="); print_byte(scl_bus); print_string(", SDA="); print_byte(sda_bus); write_char('\n');
switch (scl_bus) {
case 3: