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Merge pull request #439 from vDorst/feat_i2c_precompute

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I2CBUS: Calculate I2C-settings as compiletime instead at runtime.
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René van Dorst authored and GitHub committed 2026-09-21 15:30:56 +02:00
2 parents f0efb84abb ce11790a0d
commit 88454ec7d7
6 files changed
+74 -102
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boot.c
+5 -7
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@@ -397,10 +397,12 @@ 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 >> RTL837X_REG_I2C_SCL_SHIFT) & RTL837X_REG_I2C_SCL_MASK;
uint8_t sda_bus = (i2c >> RTL837X_REG_I2C_SDA_SHIFT) & RTL837X_REG_I2C_SDA_MASK;
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) {
// `& RTL837X_REG_I2C_SCL_MASK` is needed to silens a compiler warning 110.
switch (scl_bus & RTL837X_REG_I2C_SCL_MASK) {
case 3:
// Bit 5-6 0b10 -> SCL (implies enabled SDA on bus 3)
sfr_mask_data(0, 0x60, 0x40);
@@ -419,8 +421,6 @@ void setup_i2c(void) __banked
sfr_mask_data(0, 0x80, 0x80);
sfr_mask_data(1, 0x01, 0x00);
break;
default:
print_string("Invalid SCL bus number: "); print_byte(scl_bus); write_char('\n');
}
switch (sda_bus) {
@@ -444,8 +444,6 @@ void setup_i2c(void) __banked
// Bit 9-10 0b01 -> SDA
sfr_mask_data(1, 0x06, 0x02);
break;
default:
print_string("Invalid SDA bus number: "); print_byte(sda_bus); write_char('\n');
}
}
reg_write_m(RTL837X_PIN_MUX_1);