Part Number: TMS570LS1224
Other Parts Discussed in Thread: HALCOGEN, LAUNCHXL2-RM46, LAUNCHXL2-TMS57012
Tool/software: Code Composer Studio
Hello,
I recently followed this tutorial, which explains how to output the value that the light sensor of your board receives to a serial terminal: https://training.ti.com/hercules-how-tutorial-12bit-adc
I am trying to get the same results using a tms570ls1224 board. As in the tutorial, I am receiving values from the light sensor every frame, but when I shine a light on the sensor, the values do not appear to be affected. I believe the problem is that the light sensor is not properly connected to the ADC.
Here is the code I have in sys_main.c:
/* USER CODE BEGIN (0) */
#include "sci.h"
#include "adc.h"
#include "stdlib.h"
unsigned char command[8];
/* USER CODE END */
/* Include Files */
#include "sys_common.h"
/* USER CODE BEGIN (1) */
#include "gio.h"
#include "het.h"
/* USER CODE END */
/** @fn void main(void)
* @brief Application main function
* @note This function is empty by default.
*
* This function is called after startup.
* The user can use this function to implement the application.
*/
int main(void)
{
/* USER CODE BEGIN (3) */
int i;
gioInit();
hetInit();
adcData_t adc_data; //ADC Data Structure
adcData_t *adc_data_ptr = &adc_data; //ADC Data Pointer
unsigned int NumberOfChars, value; //Declare variables
sciInit(); //Initializes the SCI (UART) module
adcInit(); //Initializes the ADC module
while(1) {
adcStartConversion(adcREG1, adcGROUP1); //Start ADC conversion
while(!adcIsConversionComplete(adcREG1, adcGROUP1)); //Wait for ADC conversion
adcGetData(adcREG1, 1U, adc_data_ptr); //Store conversion into ADC pointer
value = (unsigned int)adc_data_ptr->value;
NumberOfChars = ltoa(value,(char *)command);
sciSend(scilinREG, 2, (unsigned char *)"0x"); //Sends '0x' hex designation chars
sciSend(scilinREG, NumberOfChars, command); //Sends the ambient light sensor data
sciSend(scilinREG, 2, (unsigned char *)"\r\n"); //Sends new line character
}
/* USER CODE END */
return 0;
}
/* USER CODE BEGIN (4) */
void adcNotification(adcBASE_t *adc, unsigned group)
{
return;
}
void sciNotification(sciBASE_t *sci, unsigned flags)
{
return;
}
void esmGroup1Notification(int bit)
{
return;
}
void esmGroup2Notification(int bit)
{
return;
}
The code all appears to be correct. I believe I need to change something in adc.c or adc.h in order to allow the sensor to communicate with the ADC.
Here is a link to the schematics of my board: http://processors.wiki.ti.com/images/c/c1/LAUNCHXL2_TMS57012_RM46_REVA.pdf
This schematic can be found on page 10:
This diagram shows how the light sensor (Q1) is connected to the ADC (AD1IN_6/9.3D).
Does anyone know what I need to do to complete the connection between the light sensor and the serial terminal’s output?
