Question
STM32 TSC Multi group + multi pin detection problem
Hello,
I am a student currently studying STM32 products.
I am trying to implement a function using the TSC feature of STM32 to read a total of 10 touch values.
I have been following various resources, but I keep encountering an issue where touching one port also causes the values of other ports to drop simultaneously.
When I checked in debug mode, I noticed that both IOGXCR[1] and IOGXCR[5] respond at the same time.
As far as I know, touch detection is shared within the same group if there are no specific pin settings. However, in this case, the groups are different, so I’m unsure why this is happening.
The board I’m using is the Nucleof303k8.
I would appreciate any help.
#include "main.h"
#include "tim.h"
#include "tsc.h"
#include "usart.h"
#include "gpio.h"
#define MAX_TOUCH_VALUE 250
#define DATA_SIZE 14
#define NUM_CHANNELS 5
#define CHANNEL_MASK 0x1F
#define NUM_GROUPS (sizeof(tch_group) / sizeof(Group_touch))
uint8_t trigger_tim3;
uint16_t tpt[10] = {0,};
uint8_t idx_tsc;
typedef struct {
uint8_t seq;
uint8_t pin_count;
uint8_t addr[4];
uint8_t used_group[4];
uint32_t touch_pins;
} tsc_mod;
tsc_mod TModule[] = {
{0, 3, {0, 1, 2}, {0, 1, 3}, TSC_GROUP1_IO2 | TSC_GROUP2_IO2 | TSC_GROUP4_IO2},
{1, 4, {3, 4, 5, 6}, {0, 1, 2, 4}, TSC_GROUP1_IO3 | TSC_GROUP2_IO3 | TSC_GROUP3_IO3| TSC_GROUP5_IO3},
{2, 3, {7, 8, 9}, {0, 1, 4}, TSC_GROUP1_IO4 | TSC_GROUP2_IO4 | TSC_GROUP5_IO4}
};
uint8_t pck[DATA_SIZE] = {0,};
void SystemClock_Config(void);
int main(void) {
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_TSC_Init();
MX_TIM3_Init();
HAL_TIM_Base_Start_IT(&htim3);
HAL_TSC_Init(&htsc);
HAL_TSC_Start_IT(&htsc);
while (1) {
if(trigger_tim3 == 1) {
trigger_tim3 = 0;
tsc_mod cur_seq_mod = TModule[idx_tsc];
HAL_TSC_IODischarge(&htsc, ENABLE);
TSC->IOHCR = ~cur_seq_mod.touch_pins;
if(HAL_TSC_PollForAcquisition(&htsc) == HAL_OK) {
if (HAL_TSC_Start(&htsc) == HAL_OK) {
if (HAL_TSC_PollForAcquisition(&htsc) == HAL_OK) {
for(int i = 0; i < cur_seq_mod.pin_count; i++) {
tpt[cur_seq_mod.addr[i]] = TSC->IOGXCR[cur_seq_mod.used_group[i]];
}
}
}
}
idx_tsc++;
if(idx_tsc > 2) {
idx_tsc = 0;
}
}
}
}
void SystemClock_Config(void) {
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
Error_Handler();
}
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
Error_Handler();
}
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
if (htim->Instance == htim3.Instance) {
if(trigger_tim3 == 0) {
trigger_tim3 = 1;
}
}
}
void Error_Handler(void) {
__disable_irq();
while (1) {}
}