TIWM and GPIO input

RE: TIWM and GPIO input

Øyvind — Fri, 29 Nov 2019 11:41:44 GMT

I'm sorry, I am not able to run it. Can you add your main file/project?

RE: TIWM and GPIO input

lelisele — Fri, 29 Nov 2019 10:38:36 GMT

Thanks for your help.

#define ECG_INTB NRF_GPIO_PIN_MAP(0,19)
#define I2C_SDA2 NRF_GPIO_PIN_MAP(0,21)

#define GYRO_SCLK2_I2C_SCL1 20

#define I2C_SCL2 NRF_GPIO_PIN_MAP(0,23)

nrf_gpio_cfg(GYRO_SCLK2_I2C_SCL1,NRF_GPIO_PIN_DIR_OUTPUT,NRF_GPIO_PIN_INPUT_CONNECT,

NRF_GPIO_PIN_PULLUP,NRF_GPIO_PIN_H0H1,NRF_GPIO_PIN_NOSENSE);

nrf_gpio_cfg(I2C_SDA2,NRF_GPIO_PIN_DIR_INPUT,NRF_GPIO_PIN_INPUT_CONNECT,
NRF_GPIO_PIN_PULLUP,NRF_GPIO_PIN_S0S1,NRF_GPIO_PIN_NOSENSE);

State pin:

nrf_gpio_cfg_input (ECG_INTB,NRF_GPIO_PIN_PULLUP);

The pin GYRO_SCLK2_I2C_SCL1 is connected also with pins I2C_SCL2 but this one is out of service and never worked (perhaps missing soldering) that is way I'm using GYRO_SCLK2_I2C_SCL1 as clock

for TWIM1. The GYRO_SCLK2_I2C_SCL1 is shared with SPI2 for another interface. TWIM1 and SPI2 works well together up to first ECG_INTB lecture as state. I've tried different configuration for not working

2C_SCL2 without any success.

RE: TIWM and GPIO input

Øyvind — Fri, 29 Nov 2019 10:06:55 GMT

Please add all defines as well, as e.g. I2C_SDA2, etc are not in nRF SDK.

RE: TIWM and GPIO input

lelisele — Thu, 28 Nov 2019 10:15:05 GMT

Hi, Thanks for your help.

I2C pins:

nrf_gpio_cfg(GYRO_SCLK2_I2C_SCL1,NRF_GPIO_PIN_DIR_OUTPUT,NRF_GPIO_PIN_INPUT_CONNECT,
NRF_GPIO_PIN_PULLUP,NRF_GPIO_PIN_H0H1,NRF_GPIO_PIN_NOSENSE);

nrf_gpio_cfg(I2C_SDA2,NRF_GPIO_PIN_DIR_INPUT,NRF_GPIO_PIN_INPUT_CONNECT,
NRF_GPIO_PIN_PULLUP,NRF_GPIO_PIN_S0S1,NRF_GPIO_PIN_NOSENSE);

State pin:

nrf_gpio_cfg_input (ECG_INTB,NRF_GPIO_PIN_PULLUP);

I2C initiation:

//Pin definition
NRF_TWIM1->PSEL.SCL = GYRO_SCLK2_I2C_SCL1;
NRF_TWIM1->PSEL.SDA = I2C_SDA2;
// TWIM initialisation
NRF_TWIM1->ADDRESS = 94;
NRF_TWIM1->FREQUENCY = TWIM_FREQUENCY_FREQUENCY_K100 << TWIM_FREQUENCY_FREQUENCY_Pos;
NRF_TWIM1->SHORTS = 0;
//TWIN enable
NRF_TWIM1->ENABLE =TWIM_ENABLE_ENABLE_Enabled << TWIM_ENABLE_ENABLE_Pos; // enable

State pin lecture:

ret = nrf_gpio_pin_input_get (ECG_INTB); //read IntB

I2C data:

static uint8_t LastAddressRead;
static uint8_t tx_buf[2]; /**< TX buffer. */
static uint8_t tx_for_rx_buf[1]; /**< TX buffer. */
static uint8_t rx_buf[1]; /**< RX buffer. */

I2C read:

rx_buf[0] = 0;

NRF_TWIM1->SHORTS = TWIM_SHORTS_LASTTX_STARTRX_Msk | TWIM_SHORTS_LASTRX_STOP_Msk;

tx_for_rx_buf[0] = LastAddressRead;
NRF_TWIM1->TXD.MAXCNT = 1;
NRF_TWIM1->TXD.PTR = (uint32_t)&tx_for_rx_buf[0];

NRF_TWIM1->RXD.MAXCNT = 1;
NRF_TWIM1->RXD.PTR = (uint32_t)&rx_buf[0];

NRF_TWIM1->EVENTS_STOPPED = 0;
NRF_TWIM1->EVENTS_LASTTX = 0;

NRF_TWIM1->TASKS_STARTTX = 1;

while (NRF_TWIM1->EVENTS_STOPPED == 0);

nrf_delay_us(50);

return (rx_buf[0]);

RE: TIWM and GPIO input

Øyvind — Thu, 28 Nov 2019 10:04:40 GMT

Can you please provide your code? I'm not able to see what the issue is.

Thanks!

Kind regards,
Øyvind

RE: TIWM and GPIO input

lelisele — Wed, 27 Nov 2019 09:40:37 GMT

Additionally, after reading input the I2C clock becomes Low even strong PoolUp?

RE: TIWM and GPIO input

lelisele — Wed, 27 Nov 2019 09:34:50 GMT

Is blocked on: while (NRF_TWIM1->EVENTS_STOPPED == 0); I don't understand what one GPIO input reading can change in TWIM periphery?

RE: TIWM and GPIO input

Øyvind — Wed, 27 Nov 2019 09:05:21 GMT

Have you tried debugging the issue to pinpoint where it fails? Are you getting any error messages?

Kind regards,
Øyvind

RE: TIWM and GPIO input

lelisele — Wed, 27 Nov 2019 08:41:06 GMT

Thanks for your quick answer. My TWIM works very well. It is based on the direct access to registers and HAL drivers.

It takes about twenty lines in SW !!!!!!!! to interface my sensor. The problem is when I read one GPIO input (pin 19) the TWIM (pin 21 and 23) is blocked and I need re-download application That is extremely strange.

RE: TIWM and GPIO input

Øyvind — Wed, 27 Nov 2019 08:29:36 GMT

Hello,

Have you tried using our TWI examples to verify connection/functionality?

Kind regards,
Øyvind