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51 lines
1.2 KiB
51 lines
1.2 KiB
#include "i2c.hpp"
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#include <cstdint>
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#include "assert.h"
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#include "driver/i2c.h"
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namespace gay_ipod {
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static constexpr int kCmdLinkSize = I2C_LINK_RECOMMENDED_SIZE(12);
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I2CTransaction::I2CTransaction() {
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// Use a fixed size buffer to avoid many many tiny allocations.
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buffer_ = (uint8_t*) calloc(sizeof(uint8_t), kCmdLinkSize);
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handle_ = i2c_cmd_link_create_static(buffer_, kCmdLinkSize);
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assert(handle_ != NULL && "failed to create command link");
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}
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I2CTransaction::~I2CTransaction() {
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free(buffer_);
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}
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esp_err_t I2CTransaction::Execute() {
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return i2c_master_cmd_begin(I2C_NUM_0, handle_, kI2CTimeout);
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}
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I2CTransaction& I2CTransaction::start() {
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ESP_ERROR_CHECK(i2c_master_start(handle_));
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return *this;
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}
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I2CTransaction& I2CTransaction::stop() {
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ESP_ERROR_CHECK(i2c_master_stop(handle_));
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return *this;
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}
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I2CTransaction& I2CTransaction::write_addr(uint8_t addr, uint8_t op) {
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write_ack(addr << 1 | op);
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return *this;
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}
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I2CTransaction& I2CTransaction::write_ack(uint8_t data) {
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ESP_ERROR_CHECK(i2c_master_write_byte(handle_, data, true));
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return *this;
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}
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I2CTransaction& I2CTransaction::read(uint8_t* dest, i2c_ack_type_t ack) {
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ESP_ERROR_CHECK(i2c_master_read_byte(handle_, dest, ack));
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return *this;
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}
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} // namespace gay_ipod
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