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displayid.cpp: fix indentation.
This commit is contained in:
Maxim Poliakovski
parent
54a86972cd
commit
3461f2e353
@ -1,7 +1,7 @@
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/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-20 divingkatae and maximum
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(theweirdo) spatium
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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@ -24,203 +24,203 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
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DisplayID::DisplayID()
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{
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/* Initialize Apple monitor codes */
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this->std_sense_code = 6;
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this->ext_sense_code = 0x2B;
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/* Initialize Apple monitor codes */
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this->std_sense_code = 6;
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this->ext_sense_code = 0x2B;
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/* Initialize DDC I2C bus */
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this->next_state = I2CState::STOP;
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this->prev_state = I2CState::STOP;
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this->last_sda = 1;
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this->last_scl = 1;
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this->data_out = 0x3000;
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this->data_ptr = 0;
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/* Initialize DDC I2C bus */
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this->next_state = I2CState::STOP;
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this->prev_state = I2CState::STOP;
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this->last_sda = 1;
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this->last_scl = 1;
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this->data_out = 0x3000;
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this->data_ptr = 0;
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/* DDC sense mode is on by default */
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this->i2c_on = true;
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/* DDC sense mode is on by default */
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this->i2c_on = true;
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}
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uint16_t DisplayID::set_result(uint8_t sda, uint8_t scl)
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{
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this->last_sda = sda;
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this->last_scl = scl;
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this->last_sda = sda;
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this->last_scl = scl;
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if (scl) {
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this->data_out |= 0x1000;
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}
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else {
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this->data_out &= ~0x1000U;
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}
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if (scl) {
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this->data_out |= 0x1000;
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}
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else {
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this->data_out &= ~0x1000U;
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}
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if (sda) {
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this->data_out |= 0x2000;
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}
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else {
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this->data_out &= ~0x2000U;
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}
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if (sda) {
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this->data_out |= 0x2000;
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}
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else {
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this->data_out &= ~0x2000U;
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}
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return this->data_out;
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return this->data_out;
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}
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uint16_t DisplayID::read_monitor_sense(uint16_t data, uint16_t dirs)
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{
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uint8_t scl, sda;
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uint16_t result;
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uint8_t scl, sda;
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uint16_t result;
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if ((dirs & 0x3100) == 0 && (data & 0x3100) == 0x3100) {
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LOG_F(WARNING, "DisplayID: Hackish Monitor ID Switch activated!");
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this->i2c_on = false;
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}
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if ((dirs & 0x3100) == 0 && (data & 0x3100) == 0x3100) {
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LOG_F(WARNING, "DisplayID: Hackish Monitor ID Switch activated!");
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this->i2c_on = false;
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}
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if (this->i2c_on) {
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/* if GPIO pins are in the output mode, pick up their values
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In the input mode, GPIO pins will be read "high" */
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scl = (dirs & 0x1000) ? !!(data & 0x1000) : 1;
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sda = (dirs & 0x2000) ? !!(data & 0x2000) : 1;
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if (this->i2c_on) {
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/* if GPIO pins are in the output mode, pick up their values
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In the input mode, GPIO pins will be read "high" */
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scl = (dirs & 0x1000) ? !!(data & 0x1000) : 1;
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sda = (dirs & 0x2000) ? !!(data & 0x2000) : 1;
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return update_ddc_i2c(sda, scl);
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}
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else { /* Apple legacy monitor codes (see Technical Note HW30) */
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switch (dirs & 0x3100) {
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case 0:
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result = ((this->std_sense_code & 6) << 11) |
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((this->std_sense_code & 1) << 8);
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break;
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case 0x2000: /* Sense line 2 is low */
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result = ((this->ext_sense_code & 0x20) << 7) |
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((this->ext_sense_code & 0x10) << 4);
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break;
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case 0x1000: /* Sense line 1 is low */
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result = ((this->ext_sense_code & 8) << 10) |
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((this->ext_sense_code & 4) << 6);
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break;
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case 0x100: /* Sense line 0 is low */
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result = ((this->ext_sense_code & 2) << 12) |
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((this->ext_sense_code & 1) << 12);
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break;
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default:
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result = 0x3100U;
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}
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return update_ddc_i2c(sda, scl);
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}
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else { /* Apple legacy monitor codes (see Technical Note HW30) */
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switch (dirs & 0x3100) {
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case 0:
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result = ((this->std_sense_code & 6) << 11) |
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((this->std_sense_code & 1) << 8);
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break;
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case 0x2000: /* Sense line 2 is low */
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result = ((this->ext_sense_code & 0x20) << 7) |
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((this->ext_sense_code & 0x10) << 4);
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break;
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case 0x1000: /* Sense line 1 is low */
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result = ((this->ext_sense_code & 8) << 10) |
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((this->ext_sense_code & 4) << 6);
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break;
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case 0x100: /* Sense line 0 is low */
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result = ((this->ext_sense_code & 2) << 12) |
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((this->ext_sense_code & 1) << 12);
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break;
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default:
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result = 0x3100U;
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}
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return result;
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}
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return result;
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}
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}
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uint16_t DisplayID::update_ddc_i2c(uint8_t sda, uint8_t scl)//(uint16_t data, uint16_t dirs)
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{
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bool clk_gone_high = false;
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bool clk_gone_high = false;
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if (scl != this->last_scl) {
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this->last_scl = scl;
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if (scl) {
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clk_gone_high = true;
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}
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}
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if (scl != this->last_scl) {
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this->last_scl = scl;
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if (scl) {
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clk_gone_high = true;
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}
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}
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if (sda != this->last_sda) {
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/* START = SDA goes high to low while SCL is high */
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/* STOP = SDA goes low to high while SCL is high */
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if (this->last_scl) {
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if (!sda) {
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LOG_F(9, "DDC-I2C: START condition detected!");
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this->next_state = I2CState::DEV_ADDR;
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this->bit_count = 0;
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}
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else {
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LOG_F(9, "DDC-I2C: STOP condition detected!");
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this->next_state = I2CState::STOP;
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}
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}
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return set_result(sda, scl);
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}
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if (sda != this->last_sda) {
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/* START = SDA goes high to low while SCL is high */
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/* STOP = SDA goes low to high while SCL is high */
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if (this->last_scl) {
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if (!sda) {
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LOG_F(9, "DDC-I2C: START condition detected!");
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this->next_state = I2CState::DEV_ADDR;
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this->bit_count = 0;
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}
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else {
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LOG_F(9, "DDC-I2C: STOP condition detected!");
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this->next_state = I2CState::STOP;
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}
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}
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return set_result(sda, scl);
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}
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if (!clk_gone_high) {
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return set_result(sda, scl);
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}
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if (!clk_gone_high) {
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return set_result(sda, scl);
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}
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switch (this->next_state) {
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case I2CState::STOP:
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break;
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switch (this->next_state) {
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case I2CState::STOP:
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break;
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case I2CState::ACK:
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this->bit_count = 0;
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this->byte = 0;
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switch (this->prev_state) {
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case I2CState::DEV_ADDR:
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if ((dev_addr & 0xFE) == 0xA0) {
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sda = 0; /* send ACK */
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}
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else {
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LOG_F(ERROR, "DDC-I2C: unknown device address 0x%X", this->dev_addr);
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sda = 1; /* send NACK */
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}
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if (this->dev_addr & 1) {
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this->next_state = I2CState::DATA;
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this->data_ptr = this->edid;
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this->byte = *(this->data_ptr++);
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}
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else {
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this->next_state = I2CState::REG_ADDR;
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}
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break;
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case I2CState::REG_ADDR:
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this->next_state = I2CState::DATA;
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if (!this->reg_addr) {
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sda = 0; /* send ACK */
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}
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else {
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LOG_F(ERROR, "DDC-I2C: unknown register address 0x%X", this->reg_addr);
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sda = 1; /* send NACK */
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}
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break;
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case I2CState::DATA:
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this->next_state = I2CState::DATA;
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if (dev_addr & 1) {
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if (!sda) {
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/* load next data byte */
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this->byte = *(this->data_ptr++);
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}
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else {
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LOG_F(ERROR, "DDC-I2C: Oops! NACK received");
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}
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}
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else {
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sda = 0; /* send ACK */
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}
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break;
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}
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break;
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case I2CState::ACK:
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this->bit_count = 0;
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this->byte = 0;
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switch (this->prev_state) {
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case I2CState::DEV_ADDR:
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if ((dev_addr & 0xFE) == 0xA0) {
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sda = 0; /* send ACK */
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}
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else {
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LOG_F(ERROR, "DDC-I2C: unknown device address 0x%X", this->dev_addr);
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sda = 1; /* send NACK */
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}
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if (this->dev_addr & 1) {
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this->next_state = I2CState::DATA;
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this->data_ptr = this->edid;
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this->byte = *(this->data_ptr++);
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}
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else {
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this->next_state = I2CState::REG_ADDR;
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}
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break;
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case I2CState::REG_ADDR:
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this->next_state = I2CState::DATA;
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if (!this->reg_addr) {
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sda = 0; /* send ACK */
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}
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else {
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LOG_F(ERROR, "DDC-I2C: unknown register address 0x%X", this->reg_addr);
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sda = 1; /* send NACK */
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}
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break;
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case I2CState::DATA:
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this->next_state = I2CState::DATA;
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if (dev_addr & 1) {
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if (!sda) {
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/* load next data byte */
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this->byte = *(this->data_ptr++);
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}
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else {
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LOG_F(ERROR, "DDC-I2C: Oops! NACK received");
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}
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}
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else {
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sda = 0; /* send ACK */
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}
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break;
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}
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break;
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case I2CState::DEV_ADDR:
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case I2CState::REG_ADDR:
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this->byte = (this->byte << 1) | this->last_sda;
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if (this->bit_count++ >= 7) {
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this->bit_count = 0;
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this->prev_state = this->next_state;
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this->next_state = I2CState::ACK;
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if (this->prev_state == I2CState::DEV_ADDR) {
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LOG_F(9, "DDC-I2C: device address received, addr=0x%X", this->byte);
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this->dev_addr = this->byte;
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}
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else {
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LOG_F(9, "DDC-I2C: register address received, addr=0x%X", this->byte);
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this->reg_addr = this->byte;
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}
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}
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break;
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case I2CState::DEV_ADDR:
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case I2CState::REG_ADDR:
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this->byte = (this->byte << 1) | this->last_sda;
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if (this->bit_count++ >= 7) {
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this->bit_count = 0;
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this->prev_state = this->next_state;
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this->next_state = I2CState::ACK;
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if (this->prev_state == I2CState::DEV_ADDR) {
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LOG_F(9, "DDC-I2C: device address received, addr=0x%X", this->byte);
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this->dev_addr = this->byte;
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}
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else {
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LOG_F(9, "DDC-I2C: register address received, addr=0x%X", this->byte);
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this->reg_addr = this->byte;
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}
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}
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break;
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case I2CState::DATA:
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sda = (this->byte >> (7 - this->bit_count)) & 1;
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if (this->bit_count++ >= 7) {
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this->bit_count = 0;
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this->prev_state = this->next_state;
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this->next_state = I2CState::ACK;
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}
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break;
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}
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case I2CState::DATA:
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sda = (this->byte >> (7 - this->bit_count)) & 1;
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if (this->bit_count++ >= 7) {
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this->bit_count = 0;
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this->prev_state = this->next_state;
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this->next_state = I2CState::ACK;
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}
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break;
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}
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return set_result(sda, scl);
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return set_result(sda, scl);
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}
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