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#include "gpio-expander.h"
namespace gay_ipod {
GpioExpander::GpioExpander() {
}
GpioExpander::~GpioExpander() {
}
esp_err_t GpioExpander::Write() {
i2c_cmd_handle_t handle = i2c_cmd_link_create();
if (handle == NULL) {
return ESP_ERR_NO_MEM;
}
// Technically enqueuing these commands could fail, but we don't worry about
// it because that would indicate some really very badly wrong more generally.
i2c_master_start(handle);
i2c_master_write_byte(handle, (PCA8575_ADDRESS << 1 | I2C_MASTER_WRITE), true);
i2c_master_write_byte(handle, port_a_, true);
i2c_master_write_byte(handle, port_b_, true);
i2c_master_stop(handle);
esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, handle, PCA8575_TIMEOUT);
i2c_cmd_link_delete(handle);
return ret;
}
esp_err_t GpioExpander::Read() {
i2c_cmd_handle_t handle = i2c_cmd_link_create();
if (handle == NULL) {
return ESP_ERR_NO_MEM;
}
// Technically enqueuing these commands could fail, but we don't worry about
// it because that would indicate some really very badly wrong more generally.
i2c_master_start(handle);
i2c_master_write_byte(handle, (PCA8575_ADDRESS << 1 | I2C_MASTER_READ), true);
i2c_master_read_byte(handle, &input_a_, I2C_MASTER_ACK);
i2c_master_read_byte(handle, &input_b_, I2C_MASTER_LAST_NACK);
i2c_master_stop(handle);
esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, handle, PCA8575_TIMEOUT);
i2c_cmd_link_delete(handle);
return ret;
}
bool GpioExpander::charge_power_ok(void) {
// Active-low.
return (input_a_ & (1 << 4)) == 0;
}
bool GpioExpander::headphone_detect(void) {
// Active-low.
return (input_b_ & (1 << 0)) == 0; // TODO.
}
uint8_t GpioExpander::key_states(void) {
return input_b_ & 0b00111111;
}
void GpioExpander::set_sd_mux(SdMuxController controller) {
port_a_ &= (1 << 5);
}
void GpioExpander::set_sd_cs(bool high) {
port_a_ &= (1 << 6);
}
void GpioExpander::set_display_cs(bool high) {
port_a_ &= (1 << 7);
}
} // namespace gay_ipod
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