LPC55 Flexcomm5 I2C

christianlees — Fri, 28 May 2021 06:18:58 GMT

For some reason I can't get an I2C interface to work on Flexcomm5 on an LPC5506.

I have double checked my code, most of it was generated by the pin and peripheral tools inside MCUXpresso. The SDA and SCL lines never get driven low. I have verified my PCB by changing them to GPIO and making sure they can go low.

I have also tried using the polling method with the same results, no action on the SDA and SCL lines. I have 10k pull up resistors.

Any help will be appreciated

From perhipherals.c

**********************************************************************************************************************/ /* clang-format off */ /* TEXT BELOW IS USED AS SETTING FOR TOOLS ************************************* instance: - name: 'I2C' - type: 'flexcomm_i2c' - mode: 'I2C_Transfer' - custom_name_enabled: 'true' - type_id: 'flexcomm_i2c_567d1a9d97c12e5d39b00259c3436dc4' - functional_group: 'BOARD_InitPeripherals' - peripheral: 'FLEXCOMM5' - config_sets: - transferCfg: - transfer: - init_callback: 'true' - callback_fcn: 'I2C_callback' - user_data: '' - init_transfer: 'false' - master_transfer_cfg: - flags: 'kI2C_TransferDefaultFlag' - slaveAddress: '0' - direction: 'kI2C_Write' - subaddressSize: '0' - subaddress: '0' - dataSize: '32' - fsl_i2c: - i2c_mode: 'kI2C_Master' - clockSource: 'FXCOMFunctionClock' - clockSourceFreq: 'BOARD_BootClockFRO12M' - i2c_master_config: - enableMaster: 'true' - baudRate_Bps: '100000' - enableTimeout: 'true' - interrupt_priority: - IRQn: 'FLEXCOMM5_IRQn' - enable_priority: 'false' - priority: '5' * BE CAREFUL MODIFYING THIS COMMENT - IT IS YAML SETTINGS FOR TOOLS **********/ /* clang-format on */ const i2c_master_config_t I2C_config = { .enableMaster = true, .baudRate_Bps = 100000UL, .enableTimeout = true }; i2c_master_handle_t I2C_handle; static void I2C_init(void) { RESET_PeripheralReset( kFC5_RST_SHIFT_RSTn); /* Initialization function */ I2C_MasterInit(I2C_PERIPHERAL, &I2C_config, I2C_CLOCK_SOURCE); memset(&I2C_handle, 0, sizeof(I2C_handle)); I2C_MasterTransferCreateHandle(I2C_PERIPHERAL, &I2C_handle, I2C_callback, NULL); }

Peripherals.h

/* BOARD_InitPeripherals defines for FLEXCOMM5 */ /* Definition of peripheral ID */ #define I2C_PERIPHERAL ((I2C_Type *)FLEXCOMM5) /* Definition of the clock source frequency */ #define I2C_CLOCK_SOURCE 8000000UL /* I2C interrupt vector ID (number). */ #define I2C_FLEXCOMM_IRQN FLEXCOMM5_IRQn

I2C routines

uint8_t completion_flag; uint8_t nak_flag; void I2C_callback(I2C_Type *base, i2c_master_handle_t *handle, status_t status, void *userData) { /* Signal transfer success when received success status. */ if (status == kStatus_Success) { completion_flag = true; } /* Signal transfer success when received success status. */ if ((status == kStatus_I2C_Nak)) { nak_flag = true; } } uint8_t i2c_wait(int timeout) { uint32_t start_time = tick_counter; while(1) { if(start_time + timeout > start_time) { if((start_time + timeout) < tick_counter) break; } else { if((start_time + timeout) < tick_counter && tick_counter < (4294967295 - timeout)) break; } if(completion_flag) return 0; } return 1; } uint8_t i2c_write(uint8_t addr, uint16_t sub_addr, uint8_t sub_addr_len, uint8_t *d, uint8_t len, int timeout) { i2c_master_transfer_t i2c_transfer; memset(&i2c_transfer, 0, sizeof(i2c_transfer)); i2c_transfer.slaveAddress = addr; i2c_transfer.direction = kI2C_Write; i2c_transfer.subaddress = sub_addr; i2c_transfer.subaddressSize = sub_addr_len; i2c_transfer.data = d; i2c_transfer.dataSize = len; i2c_transfer.flags = kI2C_TransferDefaultFlag; completion_flag = false; nak_flag = false; I2C_MasterTransferNonBlocking(I2C_PERIPHERAL, &I2C_handle, &i2c_transfer); if(i2c_wait(timeout)) return 1; else return 0; } uint8_t i2c_read(uint8_t addr, uint16_t sub_addr, uint8_t sub_addr_len, uint8_t *d, uint8_t len, int timeout) { i2c_master_transfer_t i2c_transfer; memset(&i2c_transfer, 0, sizeof(i2c_transfer)); i2c_transfer.slaveAddress = addr; i2c_transfer.direction = kI2C_Read; i2c_transfer.subaddress = sub_addr; i2c_transfer.subaddressSize = sub_addr_len; i2c_transfer.data = d; i2c_transfer.dataSize = len; i2c_transfer.flags = kI2C_TransferDefaultFlag; completion_flag = false; nak_flag = false; I2C_MasterTransferNonBlocking(I2C_PERIPHERAL, &I2C_handle, &i2c_transfer); if(i2c_wait(timeout)) return 1; else return 0; }

Re: LPC55 Flexcomm5 I2C

Alice_Yang — Mon, 31 May 2021 08:01:06 GMT

Hello christianlees,

Recommend you first refer to the I2C demo under SDK:

https://mcuxpresso.nxp.com/en/builder?hw=LPCXpresso55S06

Re: LPC55 Flexcomm5 I2C

christianlees — Tue, 01 Jun 2021 23:03:29 GMT

Alice,

I did that and it worked. But if I start a new project, use the supplies gui tools for setting the clocks and pins and then use the simplest I2C code it still doesn't work. A solution is to not use the GUI tools for this part of my code

Re: LPC55 Flexcomm5 I2C

Alice_Yang — Fri, 04 Jun 2021 01:46:08 GMT

Hello christianlees,

The MCUXpressso config GUI not generate all the related code, you can compare the generated code with demo project code, check which code you need to add .

Alice

topic Re: LPC55 Flexcomm5 I2C in LPC Microcontrollers

LPC55 Flexcomm5 I2C

Re: LPC55 Flexcomm5 I2C

Re: LPC55 Flexcomm5 I2C

Re: LPC55 Flexcomm5 I2C