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esp32_eurorack_generic
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Feat: add DAC multiwrite loop to test output 

Refs: #8
pull/9/head
rkcf 2023-02-20 06:37:37 -06:00
parent 0d7c2a6cc1
commit b3f4a14697
1 changed files with 36 additions and 1 deletions
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37
src/main/esp32_eurorack_generic.c
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@ -14,6 +14,9 @@
#define DAC_LDAC_PIN 14 #define DAC_LDAC_PIN 14
#define DAC_ADDR 0x64 /* I2C Address of DAC */ #define DAC_ADDR 0x64 /* I2C Address of DAC */
#define DAC_VREF 0x00 /* Use Vdd as reference voltage */
#define DAC_PD 0x00 /* Full power mode */
#define DAC_GAIN 0x00 /* Since we use external Vref, this doesn't matter */
#define ACK_EN 0x1 /* Enable i2c acknowledgment check */ #define ACK_EN 0x1 /* Enable i2c acknowledgment check */
#define ACK_DIS 0x0 /* Disable i2c acknowledgment check */ #define ACK_DIS 0x0 /* Disable i2c acknowledgment check */
@ -58,7 +61,7 @@ static esp_err_t dac_test(void)
i2c_master_start(cmd); i2c_master_start(cmd);
i2c_master_write_byte(cmd, (DAC_ADDR << 1) | I2C_MASTER_READ, ACK_EN); /* R/W byte is LSB of DAC address */ i2c_master_write_byte(cmd, (DAC_ADDR << 1) | I2C_MASTER_READ, ACK_EN); /* R/W byte is LSB of DAC address */
i2c_master_stop(cmd); i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_PORT, cmd, 10000 / portTICK_PERIOD_MS); esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_PORT, cmd, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd); i2c_cmd_link_delete(cmd);
return ret; return ret;
@ -77,4 +80,36 @@ void app_main(void)
} else { } else {
ESP_LOGI(TAG, "Sucessfully initialized DAC"); ESP_LOGI(TAG, "Sucessfully initialized DAC");
} }
uint16_t test_value = 0; /* The value sent to DAC input registers */
i2c_cmd_handle_t cmd;
/* Loop to test DAC output */
while (1) {
for (uint16_t i = 0; i < 4096; i++){
test_value = i;
cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (DAC_ADDR << 1) | I2C_MASTER_WRITE, ACK_EN); /* R/W byte is LSB of DAC address */
i2c_master_write_byte(cmd, 0x50, ACK_EN); /* Multi-write to all channels */
/* For each channel [A-D] write 2 bytes to input register */
/* V_ref + PD1 + PD0 + Gx + D11-D8 | D7-D0 */
for (uint8_t i = 0; i < 4; i++) {
uint8_t bytes[2];
bytes[0] = ((uint8_t) DAC_VREF << 7) | ((uint8_t) DAC_PD << 5) | ((uint8_t) DAC_GAIN << 4) | (test_value >> 8);
bytes[1] = test_value;
i2c_master_write_byte(cmd, bytes[0], ACK_EN);
i2c_master_write_byte(cmd, bytes[1], ACK_EN);
}
i2c_master_stop(cmd);
/* Issue the multi-write command */
ret = i2c_master_cmd_begin(I2C_MASTER_PORT, cmd, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
}
}
} }