76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
#include "i2c.h"
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#include "driver/i2c.h"
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#include "esp_log.h"
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#include "max17048.h"
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// Helper: Initializes I2C controller at 100kHz, returns 0=success
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esp_err_t i2c_init() {
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// 1. Initialize I2C
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i2c_config_t conf = {
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.mode = I2C_MODE_MASTER,
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.sda_io_num = I2C_MASTER_SDA_IO,
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.scl_io_num = I2C_MASTER_SCL_IO,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_pullup_en = GPIO_PULLUP_ENABLE,
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.master.clk_speed = I2C_MASTER_FREQ_HZ,
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};
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return (i2c_param_config(I2C_MASTER_NUM, &conf) ||
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i2c_driver_install(I2C_MASTER_NUM, conf.mode, 0, 0, 0));
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}
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// Helper: Read 16-bit register to 2-byte array (MSB first big endian)
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esp_err_t max17048_read_reg(uint8_t reg_addr, uint8_t *MSB, uint8_t *LSB) {
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// this is better than converting to little endian for my application
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// since I usually need to handle bytes individually.
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uint8_t data[2];
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// Write register address
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (MAX17048_ADDR << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(cmd, reg_addr, true);
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// Restart and Read 2 bytes
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (MAX17048_ADDR << 1) | I2C_MASTER_READ, true);
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i2c_master_read(cmd, data, 2, I2C_MASTER_LAST_NACK);
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i2c_master_stop(cmd);
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esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, pdMS_TO_TICKS(I2C_MASTER_TIMEOUT_MS));
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i2c_cmd_link_delete(cmd);
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if (ret == ESP_OK) {
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*MSB = data[0];
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*LSB = data[1];
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}
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return ret;
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}
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// Write big endian 2-byte array to a 16-bit register
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esp_err_t max17048_write_reg(uint8_t reg_addr, uint8_t MSB, uint8_t LSB) {
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// Write register address
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (MAX17048_ADDR << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(cmd, reg_addr, true);
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i2c_master_write_byte(cmd, MSB, true);
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i2c_master_write_byte(cmd, LSB, true);
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i2c_master_stop(cmd);
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esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, pdMS_TO_TICKS(I2C_MASTER_TIMEOUT_MS));
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i2c_cmd_link_delete(cmd);
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return ret;
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}
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esp_err_t max17048_friendly_write_reg(uint8_t reg_addr, uint8_t MSB, uint8_t LSB,
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uint8_t MSBmask, uint8_t LSBmask) {
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uint8_t origMSB, origLSB;
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esp_err_t err = max17048_read_reg(reg_addr, origMSB, origLSB);
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MSB &= MSBmask;
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LSB &= LSBmask;
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MSB |= origMSB & ~MSBmask;
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LSB |= origLSB & ~LSBmask;
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return err | max17048_write_reg(reg_addr, MSB, LSB);
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}
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