Hello!
I'm trying to get the 16 bit ADC value as 2 of 8 bit array from nRF51 development kit over bluetooth to MCP, but when it displays on the MCP the value is "swap" for example is input value is 0X1020 then, in the MCP it shows "(0x) 20-10
Here is the code:
uint32_t adc_update(ble_adc_t * p_bms, uint16_t adc)
{
uint32_t err_code = NRF_SUCCESS;
ble_gatts_value_t gatts_value;
// Initialize value struct.
memset(&gatts_value, 0, sizeof(gatts_value));
gatts_value.len = sizeof(uint16_t);
gatts_value.offset = 0;
gatts_value.p_value = (uint8_t *)&adc;
if(p_bms->bvm_count== BLE_ADC_MAX_BUFFERED_MEASUREMENTS)
{
// The voltage measurement buffer is full, delete the oldest value
memmove(&p_bms->adc_buffer[0],
&p_bms->adc_buffer[1],
(BLE_ADC_MAX_BUFFERED_MEASUREMENTS - 1) * sizeof(uint16_t));
p_bms->bvm_count--;
}
// Add new value
uint16_t ab = 0x1020;
p_bms->adc_buffer[p_bms->bvm_count++] = ab;
// Update database.
err_code = sd_ble_gatts_value_set(p_bms->conn_handle,
p_bms->sample_level_handles.value_handle,
&gatts_value);
// Send value if connected and notifying.
if ((p_bms->conn_handle != BLE_CONN_HANDLE_INVALID) && p_bms->is_notification_supported)
{
uint8_t initial_sample_level[MAX_ADC_LEN];
uint16_t len;
uint16_t hvx_len;
ble_gatts_hvx_params_t hvx_params;
len = adc_encode(p_bms,initial_sample_level);
hvx_len = len;
memset(&hvx_params, 0, sizeof(hvx_params));
hvx_params.handle = p_bms->sample_level_handles.value_handle;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
hvx_params.offset = 0;
hvx_params.p_len = &hvx_len;
hvx_params.p_data = initial_sample_level;
err_code = sd_ble_gatts_hvx(p_bms->conn_handle, &hvx_params);
if ((err_code == NRF_SUCCESS) && (hvx_len != len))
{
err_code = NRF_ERROR_DATA_SIZE;
}
}
else
{
err_code = NRF_ERROR_INVALID_STATE;
}
return err_code;
}
Please look closer to this piece of code:
// Add new value
uint16_t ab = 0x1020;
p_bms->adc_buffer[p_bms->bvm_count++] = ab;
If the value of ab = 0x1020 the MCP will display (0x) 20 - 10
Here is the screen shot of what it display on MCP.
I've tried to fixed this all day today, but still can't fix it.
Any help is greatly appreciative!
