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cc3200: Improve I2C timeout handling.

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This commit is contained in:
danicampora 2015-03-18 13:16:09 +01:00
parent f43e03ee4f
commit d3912549a3
1 changed files with 39 additions and 32 deletions
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69
cc3200/mods/pybi2c.c
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@ -43,6 +43,7 @@
#include "pybi2c.h"
#include "mpexception.h"
#include "pybsleep.h"
#include "utils.h"
/// \moduleref pyb
/// \class I2C - a two-wire serial protocol
@ -95,7 +96,7 @@
typedef struct _pyb_i2c_obj_t {
mp_obj_base_t base;
int mode;
uint mode;
union {
uint baudrate;
byte slvaddr;
@ -109,9 +110,10 @@ typedef struct _pyb_i2c_obj_t {
#define PYBI2C_MODE_MASTER (0)
#define PYBI2C_MODE_SLAVE (1)
#define PYBI2C_DEF_TIMEOUT_MS (7)
#define PYBI2C_DEF_TIMEOUT_MS (5)
#define PYBI2C_TRANSAC_WAIT_DELAY_US (10)
#define PYBI2C_TIMEOUT_TO_COUNT(to_ms, baud) (((baud) * to_ms) / 16000)
#define PYBI2C_TIMEOUT_TO_COUNT(to_us, baud) (((baud) * to_us) / 16000000)
#define RET_IF_ERR(Func) { \
if (!Func) { \
@ -132,7 +134,6 @@ STATIC void i2c_init (pyb_i2c_obj_t *self) {
// Enable the I2C Peripheral
MAP_PRCMPeripheralClkEnable(PRCM_I2CA0, PRCM_RUN_MODE_CLK | PRCM_SLP_MODE_CLK);
MAP_PRCMPeripheralReset(PRCM_I2CA0);
// Configure I2C module with the specified baudrate
MAP_I2CMasterInitExpClk(I2CA0_BASE, self->baudrate);
}
@ -142,20 +143,27 @@ STATIC void i2c_deinit(void) {
MAP_PRCMPeripheralClkDisable(PRCM_I2CA0, PRCM_RUN_MODE_CLK | PRCM_SLP_MODE_CLK);
}
/******************************************************************************/
/* Micro Python bindings */
/******************************************************************************/
STATIC bool pybI2C_transaction(uint cmd, uint timeout) {
STATIC bool pybI2C_transaction(uint cmd, int timeout) {
// Sanity check, t_timeout must be between 1 and 255
// convert timeout to microseconds
timeout = timeout > 0 ? (timeout * 1000) : 1000;
uint t_timeout = MIN(PYBI2C_TIMEOUT_TO_COUNT(timeout, pyb_i2c_obj.baudrate), 255);
// Clear all interrupts
MAP_I2CMasterIntClearEx(I2CA0_BASE, MAP_I2CMasterIntStatusEx(I2CA0_BASE, false));
// Set the time-out. Not to be used with breakpoints.
MAP_I2CMasterTimeoutSet(I2CA0_BASE, timeout);
// Set the time-out in terms of clock cycles. Not to be used with breakpoints.
MAP_I2CMasterTimeoutSet(I2CA0_BASE, t_timeout);
// Initiate the transfer.
MAP_I2CMasterControl(I2CA0_BASE, cmd);
// Wait until the current byte has been transferred.
// Poll on the raw interrupt status.
while ((MAP_I2CMasterIntStatusEx(I2CA0_BASE, false) & (I2C_MASTER_INT_DATA | I2C_MASTER_INT_TIMEOUT)) == 0);
while ((MAP_I2CMasterIntStatusEx(I2CA0_BASE, false) & (I2C_MASTER_INT_DATA | I2C_MASTER_INT_TIMEOUT)) == 0) {
// wait for a few microseconds
UtilsDelay(UTILS_DELAY_US_TO_COUNT(PYBI2C_TRANSAC_WAIT_DELAY_US));
timeout -= PYBI2C_TRANSAC_WAIT_DELAY_US;
if (timeout < 0) {
return false;
}
}
// Check for any errors in transfer
if (MAP_I2CMasterErr(I2CA0_BASE) != I2C_MASTER_ERR_NONE) {
@ -179,8 +187,7 @@ STATIC bool pybI2C_transaction(uint cmd, uint timeout) {
return true;
}
STATIC bool pybI2C_Write(byte devAddr, byte *data, uint len, bool stop, uint timeout) {
STATIC bool pybI2C_Write(byte devAddr, byte *data, uint len, bool stop, int timeout) {
// Set I2C codec slave address
MAP_I2CMasterSlaveAddrSet(I2CA0_BASE, devAddr, false);
// Write the first byte to the controller.
@ -204,7 +211,7 @@ STATIC bool pybI2C_Write(byte devAddr, byte *data, uint len, bool stop, uint tim
return true;
}
STATIC bool pybI2C_Read(byte devAddr, byte *data, uint len, uint timeout) {
STATIC bool pybI2C_Read(byte devAddr, byte *data, uint len, int timeout) {
uint cmd;
// Set I2C codec slave address
@ -244,7 +251,7 @@ STATIC bool pybI2C_Read(byte devAddr, byte *data, uint len, uint timeout) {
return true;
}
STATIC bool pybI2C_ScanDevice(byte devAddr, uint timeout) {
STATIC bool pybI2C_ScanDevice(byte devAddr, int timeout) {
// Set I2C codec slave address
MAP_I2CMasterSlaveAddrSet(I2CA0_BASE, devAddr, true);
// Initiate the transfer.
@ -270,6 +277,10 @@ STATIC void pyb_i2c_print(void (*print)(void *env, const char *fmt, ...), void *
}
}
/******************************************************************************/
/* Micro Python bindings */
/******************************************************************************/
/// \method init(mode, *, addr=0x12, baudrate=400000)
///
/// Initialise the I2C bus with the given parameters:
@ -374,7 +385,7 @@ STATIC mp_obj_t pyb_i2c_is_ready(mp_obj_t self_in, mp_obj_t i2c_addr_o) {
mp_uint_t i2c_addr = mp_obj_get_int(i2c_addr_o);
for (int i = 0; i < 10; i++) {
if (pybI2C_ScanDevice(i2c_addr, PYBI2C_TIMEOUT_TO_COUNT(PYBI2C_DEF_TIMEOUT_MS, self->baudrate))) {
if (pybI2C_ScanDevice(i2c_addr, PYBI2C_DEF_TIMEOUT_MS)) {
return mp_const_true;
}
}
@ -397,7 +408,7 @@ STATIC mp_obj_t pyb_i2c_scan(mp_obj_t self_in) {
for (uint addr = 1; addr <= 127; addr++) {
for (int i = 0; i < 10; i++) {
if (pybI2C_ScanDevice(addr, PYBI2C_TIMEOUT_TO_COUNT(PYBI2C_DEF_TIMEOUT_MS, self->baudrate))) {
if (pybI2C_ScanDevice(addr, PYBI2C_DEF_TIMEOUT_MS)) {
mp_obj_list_append(list, mp_obj_new_int(addr));
break;
}
@ -418,7 +429,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_i2c_scan_obj, pyb_i2c_scan);
STATIC const mp_arg_t pyb_i2c_send_args[] = {
{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_addr, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = PYBI2C_DEF_TIMEOUT_MS} },
};
#define PYB_I2C_SEND_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_send_args)
@ -436,8 +447,7 @@ STATIC mp_obj_t pyb_i2c_send(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *k
// send the data
if (self->mode == PYBI2C_MODE_MASTER) {
uint timeout = MIN(PYBI2C_TIMEOUT_TO_COUNT(vals[2].u_int, self->baudrate), 255);
if (!pybI2C_Write(vals[1].u_int, bufinfo.buf, bufinfo.len, true, timeout)) {
if (!pybI2C_Write(vals[1].u_int, bufinfo.buf, bufinfo.len, true, vals[2].u_int)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, mpexception_os_operation_failed));
}
} else {
@ -462,7 +472,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_i2c_send_obj, 1, pyb_i2c_send);
STATIC const mp_arg_t pyb_i2c_recv_args[] = {
{ MP_QSTR_recv, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_addr, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = PYBI2C_DEF_TIMEOUT_MS} },
};
#define PYB_I2C_RECV_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_recv_args)
@ -479,8 +489,7 @@ STATIC mp_obj_t pyb_i2c_recv(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *k
// receive the data
if (self->mode == PYBI2C_MODE_MASTER) {
uint timeout = MIN(PYBI2C_TIMEOUT_TO_COUNT(vals[2].u_int, self->baudrate), 255);
if (!pybI2C_Read(vals[1].u_int, (byte *)vstr.buf, vstr.len, timeout)) {
if (!pybI2C_Read(vals[1].u_int, (byte *)vstr.buf, vstr.len, vals[2].u_int)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, mpexception_os_operation_failed));
}
} else {
@ -512,7 +521,7 @@ STATIC const mp_arg_t pyb_i2c_mem_read_args[] = {
{ MP_QSTR_data, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_addr, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_memaddr, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = PYBI2C_DEF_TIMEOUT_MS} },
{ MP_QSTR_addr_size, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
};
#define PYB_I2C_MEM_READ_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_mem_read_args)
@ -539,10 +548,9 @@ STATIC mp_obj_t pyb_i2c_mem_read(mp_uint_t n_args, const mp_obj_t *args, mp_map_
mp_uint_t mem_addr_size = vals[4].u_int >> 3;
// Write the register address to be read from.
uint timeout = MIN(PYBI2C_TIMEOUT_TO_COUNT(vals[3].u_int, self->baudrate), 255);
if (pybI2C_Write (i2c_addr, (byte *)&mem_addr, mem_addr_size, false, timeout)) {
if (pybI2C_Write (i2c_addr, (byte *)&mem_addr, mem_addr_size, false, vals[3].u_int)) {
// Read the specified length of data
if (pybI2C_Read (i2c_addr, (byte *)vstr.buf, vstr.len, timeout)) {
if (pybI2C_Read (i2c_addr, (byte *)vstr.buf, vstr.len, vals[3].u_int)) {
// return the read data
if (o_ret != MP_OBJ_NULL) {
return o_ret;
@ -593,10 +601,9 @@ STATIC mp_obj_t pyb_i2c_mem_write(mp_uint_t n_args, const mp_obj_t *args, mp_map
mp_uint_t mem_addr_size = vals[4].u_int >> 3;
// Write the register address to be write to.
uint timeout = MIN(PYBI2C_TIMEOUT_TO_COUNT(vals[2].u_int, self->baudrate), 255);
if (pybI2C_Write (i2c_addr, (byte *)&mem_addr, mem_addr_size, false, timeout)) {
if (pybI2C_Write (i2c_addr, (byte *)&mem_addr, mem_addr_size, false, vals[3].u_int)) {
// Write the specified length of data
if (pybI2C_Write (i2c_addr, bufinfo.buf, bufinfo.len, true, timeout)) {
if (pybI2C_Write (i2c_addr, bufinfo.buf, bufinfo.len, true, vals[3].u_int)) {
return mp_const_none;
}
}