1. 最近公司找了一家新的Solution方案公司, 不知道跟ST的比較起來差多少, 有空再來研究一下.
2016年5月31日 星期二
2016年5月12日 星期四
nRF52832 I2C Master Driver
1. 最近才知道原來Nordic有新版的i2c driver, 簡單地做個備份, 才知道以後要怎樣用.
2. 需先include nrf_drv_twi.c & nrf_drv_twi.h, 路徑在\components\drivers_nrf\twi_master\.
3. 需記得打開Define: TWIM_IN_USE.
4. 本範例使用TWI1, 所以記得需至nrf_drv_config.h打開相關的設定及設定I2C GPIO和I2C Frequency.
5. 接下來就是I2C.h & I2C.c的簡易程式碼.
I2C.h
2. 需先include nrf_drv_twi.c & nrf_drv_twi.h, 路徑在\components\drivers_nrf\twi_master\.
3. 需記得打開Define: TWIM_IN_USE.
4. 本範例使用TWI1, 所以記得需至nrf_drv_config.h打開相關的設定及設定I2C GPIO和I2C Frequency.
5. 接下來就是I2C.h & I2C.c的簡易程式碼.
I2C.h
#ifndef __I2C_H__ #define __I2C_H__ #include "nrf_drv_twi.h" bool i2c_write( uint8_t device_address, uint8_t register_address, uint8_t *value, uint8_t number_of_bytes ); bool i2c_read( uint8_t device_address, uint8_t register_address, uint8_t *destination, uint8_t number_of_bytes ); #endif /* __I2C_H__ */I2C.c
#include "I2C.h" bool i2c_write(uint8_t device_address, uint8_t register_address, uint8_t *value, uint8_t number_of_bytes ) { #define i2c_write_data_len 6 uint8_t w2_data[i2c_write_data_len+1], i; const nrf_drv_twi_t twi = NRF_DRV_TWI_INSTANCE(1); nrf_drv_twi_init(&twi, NULL, NULL, NULL); w2_data[0] = register_address; for ( i = 0 ; i < number_of_bytes ; i++ ) { w2_data[i +1] = value[i]; } nrf_drv_twi_enable(&twi); nrf_drv_twi_tx(&twi, (device_address)>>1, w2_data, number_of_bytes+1, false); return true; } bool i2c_read(uint8_t device_address, uint8_t register_address, uint8_t * destination, uint8_t number_of_bytes) { const nrf_drv_twi_t twi = NRF_DRV_TWI_INSTANCE(1); nrf_drv_twi_init(&twi, NULL, NULL, NULL); nrf_drv_twi_enable(&twi); nrf_drv_twi_tx(&twi, (device_address)>>1, ®ister_address, 1, true); nrf_drv_twi_rx(&twi, (device_address)>>1, destination, number_of_bytes); return true; }
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