void mcp7941x_set_date_time(struct rtc_time *t) {
static char cmd[] = {MCP7941X_RTCC_TCR_SECONDS};
char reg[] = {0,0,0,0,0,0,0};
reg[MCP7941X_RTCC_TCR_SECONDS] = DEC2BCD(t->tm_sec & 0x7f);
reg[MCP7941X_RTCC_TCR_MINUTES] = DEC2BCD(t->tm_min & 0x7f);
reg[MCP7941X_RTCC_TCR_HOURS] = DEC2BCD(t->tm_hour & 0x1f);
reg[MCP7941X_RTCC_TCR_DAY] = DEC2BCD(t->tm_wday & 0x07);
reg[MCP7941X_RTCC_TCR_DATE] = DEC2BCD(t->tm_mday & 0x3f);
reg[MCP7941X_RTCC_TCR_MONTH] = DEC2BCD(t->tm_mon & 0x1f);
reg[MCP7941X_RTCC_TCR_YEAR] = DEC2BCD(t->tm_year);
reg[MCP7941X_RTCC_TCR_SECONDS] |= MCP7941X_RTCC_BIT_ST;
reg[MCP7941X_RTCC_TCR_DAY] |= MCP7941X_RTCC_BIT_VBATEN;
char data[8];
data[0] = cmd[1];
data[1] = reg[0];
data[2] = reg[1];
data[3] = reg[2];
data[4] = reg[3];
data[5] = reg[4];
data[6] = reg[5];
data[7] = reg[6];
mcp7941x_setup();
bcm2835_i2c_write(data, sizeof(data)/sizeof(char));
}
void mcp7941x_get_date_time(struct rtc_time *t) {
static char cmd[] = {MCP7941X_RTCC_TCR_SECONDS};
char reg[] = {0,0,0,0,0,0,0};
mcp7941x_setup();
bcm2835_i2c_write(cmd, sizeof(cmd)/sizeof(char));
bcm2835_i2c_read(reg, sizeof(reg)/sizeof(char));
t->tm_sec = BCD2DEC(reg[MCP7941X_RTCC_TCR_SECONDS] & 0x7f);
t->tm_min = BCD2DEC(reg[MCP7941X_RTCC_TCR_MINUTES] & 0x7f);
t->tm_hour = BCD2DEC(reg[MCP7941X_RTCC_TCR_HOURS] & 0x3f);
t->tm_wday = BCD2DEC(reg[MCP7941X_RTCC_TCR_DAY] & 0x07);
t->tm_mday = BCD2DEC(reg[MCP7941X_RTCC_TCR_DATE] & 0x3f);
t->tm_mon = BCD2DEC(reg[MCP7941X_RTCC_TCR_MONTH] & 0x1f);
t->tm_year = BCD2DEC(reg[MCP7941X_RTCC_TCR_YEAR]);
}
/**
* @ingroup I2C-RTC
*
* @param slave_address
* @return
*/
uint8_t mcp7941x_start (const uint8_t slave_address) {
#if !defined(BARE_METAL) && !defined(__AVR_ARCH__)
if (bcm2835_init() != 1)
return MCP7941X_ERROR;
#endif
FUNC_PREFIX(i2c_begin());
if (slave_address <= 0)
i2c_mcp7941x_slave_address = MCP7941X_DEFAULT_SLAVE_ADDRESS;
else
i2c_mcp7941x_slave_address = slave_address;
mcp7941x_setup();
if (bcm2835_i2c_write(NULL, 0) == 0)
return MCP7941X_OK;
return MCP7941X_ERROR;
}