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Implement a stop condition transmission setting function of I2C. 

User can specify the sending of STOP condition by this implement.
pull/835/head
Masao Hamanaka 2015-01-07 19:10:26 +09:00
parent d469fdf79e
commit b13b047a76
1 changed files with 24 additions and 12 deletions
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36
libraries/mbed/targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/i2c_api.c
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@ -462,16 +462,25 @@ int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
i2c_set_err_noslave(obj);
return I2C_ERROR_NO_SLAVE;
}
/* RIICnSR2.STOP = 0 */
REG(SR2.UINT32) &= ~SR2_STOP;
/* RIICnCR2.SP = 1 */
REG(CR2.UINT32) |= CR2_SP;
/* RIICnDRR read */
value = REG(DRR.UINT32) & 0xFF;
data[count] = (char)value;
/* RIICnMR3.WAIT = 0 */
REG(MR3.UINT32) &= ~MR3_WAIT;
(void)i2c_wait_STOP(obj);
/* If not repeated start, send stop. */
if (stop) {
/* RIICnSR2.STOP = 0 */
REG(SR2.UINT32) &= ~SR2_STOP;
/* RIICnCR2.SP = 1 */
REG(CR2.UINT32) |= CR2_SP;
/* RIICnDRR read */
value = REG(DRR.UINT32) & 0xFF;
data[count] = (char)value;
/* RIICnMR3.WAIT = 0 */
REG(MR3.UINT32) &= ~MR3_WAIT;
(void)i2c_wait_STOP(obj);
} else {
/* RIICnDRR read */
value = REG(DRR.UINT32) & 0xFF;
data[count] = (char)value;
/* RIICnMR3.WAIT = 0 */
REG(MR3.UINT32) &= ~MR3_WAIT;
}
i2c_set_NACKF_STOP(obj);
return length;
@ -506,8 +515,11 @@ int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
i2c_set_err_noslave(obj);
return I2C_ERROR_NO_SLAVE;
}
i2c_stop(obj);
(void)i2c_wait_STOP(obj);
/* If not repeated start, send stop. */
if (stop) {
i2c_stop(obj);
(void)i2c_wait_STOP(obj);
}
i2c_set_NACKF_STOP(obj);
return length;