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Merge pull request #992 from arturo182/nrf_i2c_fix

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nrf: Fix I2C transfers with data larger than HW allows
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Scott Shawcroft 2018-07-08 20:12:09 -07:00 committed by GitHub
commit fd5634e4aa
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 29 additions and 2 deletions
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31
ports/nrf/common-hal/busio/I2C.c
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@ -34,6 +34,7 @@
#include "nrf_gpio.h"
#define INST_NO 0
#define MAX_XFER_SIZE ((1U << NRFX_CONCAT_3(TWIM, INST_NO, _EASYDMA_MAXCNT_SIZE)) - 1)
static uint8_t twi_error_to_mp(const nrfx_err_t err) {
switch (err) {
@ -152,8 +153,21 @@ uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr, const u
if(len == 0)
return common_hal_busio_i2c_probe(self, addr) ? 0 : MP_ENODEV;
const uint32_t parts = len / MAX_XFER_SIZE;
const uint32_t remainder = len % MAX_XFER_SIZE;
nrfx_err_t err = NRFX_SUCCESS;
nrfx_twim_enable(&self->twim);
const nrfx_err_t err = nrfx_twim_tx(&self->twim, addr, data, len, !stopBit);
for (uint32_t i = 0; i < parts; ++i) {
err = nrfx_twim_tx(&self->twim, addr, data + i * MAX_XFER_SIZE, MAX_XFER_SIZE, !stopBit);
if (err != NRFX_SUCCESS)
break;
}
if ((remainder > 0) && (err == NRFX_SUCCESS))
err = nrfx_twim_tx(&self->twim, addr, data + parts * MAX_XFER_SIZE, remainder, !stopBit);
nrfx_twim_disable(&self->twim);
return twi_error_to_mp(err);
@ -163,8 +177,21 @@ uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t addr, uint8_t
if(len == 0)
return 0;
const uint32_t parts = len / MAX_XFER_SIZE;
const uint32_t remainder = len % MAX_XFER_SIZE;
nrfx_err_t err = NRFX_SUCCESS;
nrfx_twim_enable(&self->twim);
const nrfx_err_t err = nrfx_twim_rx(&self->twim, addr, data, len);
for (uint32_t i = 0; i < parts; ++i) {
err = nrfx_twim_rx(&self->twim, addr, data + i * MAX_XFER_SIZE, MAX_XFER_SIZE);
if (err != NRFX_SUCCESS)
break;
}
if ((remainder > 0) && (err == NRFX_SUCCESS))
err = nrfx_twim_rx(&self->twim, addr, data + parts * MAX_XFER_SIZE, remainder);
nrfx_twim_disable(&self->twim);
return twi_error_to_mp(err);