STM32L562RE I2C2 Clock Not Being Set
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haydenth commented
This is on a custom board with STM32L562. Here's how my STM32 pins are configured, PB10, BP11 as I2C2.
Here is my SystemClock_Config which sets the I2C2 Clock
WEAK void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {};
/** Configure the main internal regulator output voltage
*/
if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE2) != HAL_OK)
{
Error_Handler();
}
/** Configure LSE Drive Capability
*/
HAL_PWR_EnableBkUpAccess();
__HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48|RCC_OSCILLATORTYPE_HSE
|RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 12;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV4;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV4;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
/** Enable MSI Auto calibration
*/
HAL_RCCEx_EnableMSIPLLMode();
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_RTC | RCC_PERIPHCLK_SDMMC1
| RCC_PERIPHCLK_UART4 | RCC_PERIPHCLK_USB
| RCC_PERIPHCLK_I2C2;
PeriphClkInit.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
PeriphClkInit.Sdmmc1ClockSelection = RCC_SDMMC1CLKSOURCE_PLLP;
PeriphClkInit.Uart4ClockSelection = RCC_UART4CLKSOURCE_PCLK1;
PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
PeriphClkInit.I2c2ClockSelection = RCC_I2C2CLKSOURCE_HSI;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
And here's my PeripheralPins section for I2C2
//*** I2C ***
#ifdef HAL_I2C_MODULE_ENABLED
WEAK const PinMap PinMap_I2C_SDA[] = {
// {PB_4, I2C3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
// {PB_7, I2C1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
// {PB_7_ALT1, I2C4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C4)},
// {PB_9, I2C1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
{PB_11, I2C2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
// {PB_11_ALT1, I2C4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF3_I2C4)},
// {PB_14, I2C2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
// {PC_1, I2C3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
// {PC_1_ALT1, I2C4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF2_I2C4)},
// {PC_9, I2C3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C3)},
{NC, NP, 0}
};
#endif
#ifdef HAL_I2C_MODULE_ENABLED
WEAK const PinMap PinMap_I2C_SCL[] = {
// {PA_7, I2C3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
// {PB_6, I2C1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
// {PB_6_ALT1, I2C4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C4)},
// {PB_8, I2C1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
{PB_10, I2C2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
// {PB_10_ALT1, I2C4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF3_I2C4)},
// {PB_13, I2C2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
// {PC_0, I2C3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
// {PC_0_ALT1, I2C4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF2_I2C4)},
{NC, NP, 0}
};
Yet, when I compile an .ino file with this code:
// Define register addresses from the reference manual
#define I2C2_BASE 0x40005800U
#define I2C2_CR1 (*(volatile uint32_t*)(I2C2_BASE + 0x00))
#define I2C2_ISR (*(volatile uint32_t*)(I2C2_BASE + 0x18))
#define I2C2_TIMINGR (*(volatile uint32_t*)(I2C2_BASE + 0x10))
#define RCC_BASE 0x40021000U // For L5, adjust if needed for L4
#define RCC_APB1ENR1 (*(volatile uint32_t*)(RCC_BASE + 0x58))
#define RCC_CCIPR1 (*(volatile uint32_t*)(RCC_BASE + 0x88)) // L5 specific, L4 is RCC_CCIPR
#define GPIOB_BASE 0x42020400U // For L5, adjust if needed for L4
#define GPIOB_MODER (*(volatile uint32_t*)(GPIOB_BASE + 0x00))
#define GPIOB_OTYPER (*(volatile uint32_t*)(GPIOB_BASE + 0x04))
#define GPIOB_PUPDR (*(volatile uint32_t*)(GPIOB_BASE + 0x0C))
#define GPIOB_AFRH (*(volatile uint32_t*)(GPIOB_BASE + 0x24))
#define GPIOB_IDR (*(volatile uint32_t*)(GPIOB_BASE + 0x10))
log_printf(DEBUG_INFO, "----- I2C Pre-Scan Debug -----");
// 1. Check if I2C2 clock is enabled in the RCC
log_printf(DEBUG_INFO, "RCC APB1ENR1: 0x%08X (I2C2EN is bit 22)", RCC_APB1ENR1);
if (!(RCC_APB1ENR1 & (1 << 22))) {
log_printf(DEBUG_ERR, "ERROR: I2C2 peripheral clock is NOT enabled!");
}
It seems like the clock source isn't being set
(8029) RCC APB1ENR1: 0x10400420 (I2C2EN is bit 22)
(8031) I2C2 Clock Source (RCC_CCIPR1): 0 (0=PCLK, 1=SYSCLK, 2=HSI16)
(8033) System Clock Freq: 8000000 Hz
(8035) PCLK1 Freq: 8000000 Hz
(8037) GPIOB MODER: 0xFFFFDEBF (should be Alternate Function '10')
(8038) GPIOB OTYPER: 0x00000000 (should be Open-Drain '1')
(8041) GPIOB AFRH: 0x00000000 (should be AF4 for I2C2)
I'm on 2.10.1
Used platform Version Path
atmosphericiq:stm32 1.0.6 /home/tom/.arduino15/packages/atmosphericiq/hardware/stm32/1.0.6
STMicroelectronics:stm32 2.10.1 /home/tom/.arduino15/packages/STMicroelectronics/hardware/stm32/2.10.1
I don't see any errors, etc in the build logs. Anything else I should check?