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Pushed LPC1114 I2C updates to the LPC11C24

pull/20/head
Matthew Else 2013-08-05 17:09:22 +01:00
parent b470ea0e73
commit 7c8c7228c8
1 changed files with 25 additions and 17 deletions
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38
libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11CXX/i2c_api.c
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@ -35,8 +35,9 @@ static const PinMap PinMap_I2C_SCL[] = {
#define I2C_SCLL(x, val) (x->i2c->SCLL = val) #define I2C_SCLL(x, val) (x->i2c->SCLL = val)
#define I2C_SCLH(x, val) (x->i2c->SCLH = val) #define I2C_SCLH(x, val) (x->i2c->SCLH = val)
static const uint32_t I2C_addr_offset[4] = { static const uint32_t I2C_addr_offset[2][4] = {
0x0C, 0x20, 0x24, 0x28 {0x0C, 0x20, 0x24, 0x28},
{0x30, 0x34, 0x38, 0x3C}
}; };
static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) { static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
@ -124,12 +125,17 @@ inline int i2c_start(i2c_t *obj) {
} }
inline int i2c_stop(i2c_t *obj) { inline int i2c_stop(i2c_t *obj) {
int timeout = 0;
// write the stop bit // write the stop bit
i2c_conset(obj, 0, 1, 0, 0); i2c_conset(obj, 0, 1, 0, 0);
i2c_clear_SI(obj); i2c_clear_SI(obj);
// wait for STO bit to reset // wait for STO bit to reset
while(I2C_CONSET(obj) & (1 << 4)); while(I2C_CONSET(obj) & (1 << 4)) {
timeout ++;
if (timeout > 100000) return 1;
}
return 0; return 0;
} }
@ -197,13 +203,13 @@ int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
if ((status != 0x10) && (status != 0x08)) { if ((status != 0x10) && (status != 0x08)) {
i2c_stop(obj); i2c_stop(obj);
return status; return I2C_ERROR_BUS_BUSY;
} }
status = i2c_do_write(obj, (address | 0x01), 1); status = i2c_do_write(obj, (address | 0x01), 1);
if (status != 0x40) { if (status != 0x40) {
i2c_stop(obj); i2c_stop(obj);
return status; return I2C_ERROR_NO_SLAVE;
} }
// Read in all except last byte // Read in all except last byte
@ -212,7 +218,7 @@ int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
status = i2c_status(obj); status = i2c_status(obj);
if (status != 0x50) { if (status != 0x50) {
i2c_stop(obj); i2c_stop(obj);
return status; return count;
} }
data[count] = (char) value; data[count] = (char) value;
} }
@ -222,7 +228,7 @@ int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
status = i2c_status(obj); status = i2c_status(obj);
if (status != 0x58) { if (status != 0x58) {
i2c_stop(obj); i2c_stop(obj);
return status; return length - 1;
} }
data[count] = (char) value; data[count] = (char) value;
@ -232,7 +238,7 @@ int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
i2c_stop(obj); i2c_stop(obj);
} }
return 0; return length;
} }
int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
@ -242,31 +248,33 @@ int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
if ((status != 0x10) && (status != 0x08)) { if ((status != 0x10) && (status != 0x08)) {
i2c_stop(obj); i2c_stop(obj);
return status; return I2C_ERROR_BUS_BUSY;
} }
status = i2c_do_write(obj, (address & 0xFE), 1); status = i2c_do_write(obj, (address & 0xFE), 1);
if (status != 0x18) { if (status != 0x18) {
i2c_stop(obj); i2c_stop(obj);
return status; return I2C_ERROR_NO_SLAVE;
} }
for (i=0; i<length; i++) { for (i=0; i<length; i++) {
status = i2c_do_write(obj, data[i], 0); status = i2c_do_write(obj, data[i], 0);
if(status != 0x28) { if(status != 0x28) {
i2c_stop(obj); i2c_stop(obj);
return status; return i;
} }
} }
i2c_clear_SI(obj); // clearing the serial interrupt here might cause an unintended rewrite of the last byte
// see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
// i2c_clear_SI(obj);
// If not repeated start, send stop. // If not repeated start, send stop.
if (stop) { if (stop) {
i2c_stop(obj); i2c_stop(obj);
} }
return 0; return length;
} }
void i2c_reset(i2c_t *obj) { void i2c_reset(i2c_t *obj) {
@ -344,7 +352,7 @@ int i2c_slave_read(i2c_t *obj, char *data, int length) {
i2c_clear_SI(obj); i2c_clear_SI(obj);
return (count - 1); return count;
} }
int i2c_slave_write(i2c_t *obj, const char *data, int length) { int i2c_slave_write(i2c_t *obj, const char *data, int length) {
@ -373,7 +381,7 @@ void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
uint32_t addr; uint32_t addr;
if ((idx >= 0) && (idx <= 3)) { if ((idx >= 0) && (idx <= 3)) {
addr = ((uint32_t)obj->i2c) + I2C_addr_offset[idx]; addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
*((uint32_t *) addr) = address & 0xFF; *((uint32_t *) addr) = address & 0xFF;
} }
} }