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gex-core/units/i2c/unit_i2c.c

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//
// Created by MightyPork on 2018/01/02.
//
#include "comm/messages.h"
#include "unit_base.h"
#include "utils/avrlibc.h"
#include "unit_i2c.h"
// I2C master
/** Private data structure */
struct priv {
uint8_t periph_num; //!< 1 or 2
bool anf; //!< Enable analog noise filter
uint8_t dnf; //!< Enable digital noise filter (1-15 ... max spike width)
uint8_t speed; //!< 0 - Standard, 1 - Fast, 2 - Fast+
I2C_TypeDef *periph;
GPIO_TypeDef *port;
uint32_t ll_pin_scl;
uint32_t ll_pin_sda;
};
// ------------------------------------------------------------------------
/** Load from a binary buffer stored in Flash */
static void UI2C_loadBinary(Unit *unit, PayloadParser *pp)
{
struct priv *priv = unit->data;
uint8_t version = pp_u8(pp);
(void)version;
priv->periph_num = pp_u8(pp);
priv->anf = pp_bool(pp);
priv->dnf = pp_u8(pp);
priv->speed = pp_u8(pp);
}
/** Write to a binary buffer for storing in Flash */
static void UI2C_writeBinary(Unit *unit, PayloadBuilder *pb)
{
struct priv *priv = unit->data;
pb_u8(pb, 0); // version
pb_u8(pb, priv->periph_num);
pb_bool(pb, priv->anf);
pb_u8(pb, priv->dnf);
pb_u8(pb, priv->speed);
}
// ------------------------------------------------------------------------
/** Parse a key-value pair from the INI file */
static bool UI2C_loadIni(Unit *unit, const char *key, const char *value)
{
bool suc = true;
struct priv *priv = unit->data;
if (streq(key, "device")) {
priv->periph_num = (uint8_t) avr_atoi(value);
}
else if (streq(key, "analog-filter")) {
priv->anf = str_parse_yn(value, &suc);
}
else if (streq(key, "digital-filter")) {
priv->dnf = (uint8_t) avr_atoi(value);
}
else if (streq(key, "speed")) {
priv->speed = (uint8_t) avr_atoi(value);
}
else {
return false;
}
return suc;
}
/** Generate INI file section for the unit */
static void UI2C_writeIni(Unit *unit, IniWriter *iw)
{
struct priv *priv = unit->data;
iw_comment(iw, "Peripheral number (I2Cx)");
iw_entry(iw, "device", "%d", (int)priv->periph_num);
iw_comment(iw, "Speed: 1-Standard, 2-Fast, 3-Fast+");
iw_entry(iw, "speed", "%d", (int)priv->speed);
iw_comment(iw, "Analog noise filter enable (Y,N)");
iw_entry(iw, "analog-filter", "%s", str_yn(priv->anf));
iw_comment(iw, "Digital noise filter bandwidth (0-15)");
iw_entry(iw, "digital-filter", "%d", (int)priv->dnf);
}
// ------------------------------------------------------------------------
/** Allocate data structure and set defaults */
static bool UI2C_preInit(Unit *unit)
{
bool suc = true;
struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv), &suc);
CHECK_SUC();
// some defaults
priv->periph_num = 1;
priv->speed = 1;
priv->anf = true;
priv->dnf = 0;
return true;
}
/** Finalize unit set-up */
static bool UI2C_init(Unit *unit)
{
bool suc = true;
struct priv *priv = unit->data;
if (!(priv->periph_num >= 1 && priv->periph_num <= 2)) {
unit->status = E_BAD_CONFIG;
dbg("!! Bad I2C periph");
return false;
}
if (!(priv->speed >= 1 && priv->speed <= 3)) {
unit->status = E_BAD_CONFIG;
dbg("!! Bad I2C speed");
return false;
}
if (priv->dnf > 15) {
unit->status = E_BAD_CONFIG;
dbg("!! Bad I2C DNF bw");
return false;
}
// assign and claim the peripheral
if (priv->periph_num == 1) {
suc = rsc_claim(unit, R_I2C1);
CHECK_SUC();
priv->periph = I2C1;
} else {
suc = rsc_claim(unit, R_I2C2);
CHECK_SUC();
priv->periph = I2C2;
}
// This is written for F072, other platforms will need adjustments
char portname;
uint8_t pin_scl;
uint8_t pin_sda;
uint32_t af_i2c;
uint32_t timing; // magic constant from CubeMX
#if GEX_PLAT_F072_DISCOVERY
// scl - 6 or 8 for I2C1, 10 for I2C2
// sda - 7 or 9 for I2C1, 11 for I2C2
portname = 'B';
if (priv->periph_num == 1) {
pin_scl = 8;
pin_sda = 9;
} else {
pin_scl = 10;
pin_sda = 12;
}
af_i2c = LL_GPIO_AF_1;
if (priv->speed == 1)
timing = 0x00301D2B; // Standard
else if (priv->speed == 2)
timing = 0x0000020B; // Fast
else
timing = 0x00000001; // Fast+
#elif GEX_PLAT_F103_BLUEPILL
#error "NO IMPL"
#elif GEX_PLAT_F303_DISCOVERY
#error "NO IMPL"
#elif GEX_PLAT_F407_DISCOVERY
#error "NO IMPL"
#else
#error "BAD PLATFORM!"
#endif
// first, we have to claim the pins
Resource r_sda = pin2resource(portname, pin_sda, &suc);
Resource r_scl = pin2resource(portname, pin_scl, &suc);
CHECK_SUC();
rsc_claim(unit, r_sda);
rsc_claim(unit, r_scl);
CHECK_SUC();
GPIO_TypeDef *port = port2periph(portname, &suc);
uint32_t ll_pin_scl = pin2ll(pin_scl, &suc);
uint32_t ll_pin_sda = pin2ll(pin_sda, &suc);
CHECK_SUC();
// configure AF
if (pin_scl < 8) LL_GPIO_SetAFPin_0_7(port, ll_pin_scl, af_i2c);
else LL_GPIO_SetAFPin_8_15(port, ll_pin_scl, af_i2c);
if (pin_sda < 8) LL_GPIO_SetAFPin_0_7(port, ll_pin_sda, af_i2c);
else LL_GPIO_SetAFPin_8_15(port, ll_pin_sda, af_i2c);
LL_GPIO_SetPinMode(port, ll_pin_scl, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetPinMode(port, ll_pin_sda, LL_GPIO_MODE_ALTERNATE);
// set as OpenDrain (this may not be needed - TODO check)
LL_GPIO_SetPinOutputType(port, ll_pin_scl, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinOutputType(port, ll_pin_sda, LL_GPIO_OUTPUT_OPENDRAIN);
if (priv->periph_num == 1) {
__HAL_RCC_I2C1_CLK_ENABLE();
} else {
__HAL_RCC_I2C2_CLK_ENABLE();
}
/* Disable the selected I2Cx Peripheral */
LL_I2C_Disable(priv->periph);
LL_I2C_ConfigFilters(priv->periph,
priv->anf ? LL_I2C_ANALOGFILTER_ENABLE
: LL_I2C_ANALOGFILTER_DISABLE,
priv->dnf);
LL_I2C_SetTiming(priv->periph, timing);
//LL_I2C_DisableClockStretching(priv->periph);
LL_I2C_Enable(priv->periph);
LL_I2C_DisableOwnAddress1(priv->periph); // OA not used
LL_I2C_SetMode(priv->periph, LL_I2C_MODE_I2C); // not using SMBus
return true;
}
/** Tear down the unit */
static void UI2C_deInit(Unit *unit)
{
struct priv *priv = unit->data;
// de-init the pins & peripheral only if inited correctly
if (unit->status == E_SUCCESS) {
LL_I2C_DeInit(priv->periph);
if (priv->periph_num == 1) {
__HAL_RCC_I2C1_CLK_DISABLE();
} else {
__HAL_RCC_I2C2_CLK_DISABLE();
}
LL_GPIO_SetPinMode(priv->port, priv->ll_pin_sda, LL_GPIO_MODE_ANALOG);
LL_GPIO_SetPinMode(priv->port, priv->ll_pin_scl, LL_GPIO_MODE_ANALOG);
}
// Release all resources
rsc_teardown(unit);
// Free memory
free(unit->data);
unit->data = NULL;
}
// ------------------------------------------------------------------------
enum PinCmd_ {
CMD_WRITE = 0,
CMD_READ = 1,
CMD_WRITE_REG = 2,
CMD_READ_REG = 3,
};
static void i2c_reset(struct priv *priv)
{
LL_I2C_Disable(priv->periph);
HAL_Delay(1);
LL_I2C_Enable(priv->periph);
}
static bool i2c_wait_until_flag(struct priv *priv, uint32_t flag, bool stop_state)
{
uint32_t t_start = HAL_GetTick();
while (((priv->periph->ISR & flag)!=0) != stop_state) {
if (HAL_GetTick() - t_start > 10) {
i2c_reset(priv);
return false;
}
}
return true;
}
static bool UU_I2C_Write(Unit *unit, uint16_t addr, const uint8_t *bytes, uint32_t bcount)
{
struct priv *priv = unit->data;
uint8_t addrsize = (uint8_t) (((addr & 0x8000) == 0) ? 7 : 10);
addr &= 0x3FF;
uint32_t ll_addrsize = (addrsize == 7) ? LL_I2C_ADDRSLAVE_7BIT : LL_I2C_ADDRSLAVE_10BIT;
if (addrsize == 7) addr <<= 1; // 7-bit address must be shifted to left for LL to use it correctly
if (!i2c_wait_until_flag(priv, I2C_ISR_BUSY, 0)) {
dbg("BUSY TOUT");
return false;
}
bool first = true;
while (bcount > 0) {
uint32_t len = bcount;
uint32_t chunk_remain = (uint8_t) ((len > 255) ? 255 : len); // if more than 255, first chunk is 255
LL_I2C_HandleTransfer(priv->periph, addr, ll_addrsize, chunk_remain,
(len > 255) ? LL_I2C_MODE_RELOAD : LL_I2C_MODE_AUTOEND, // Autoend if this is the last chunk
first ? LL_I2C_GENERATE_START_WRITE : LL_I2C_GENERATE_NOSTARTSTOP); // no start/stop condition if we're continuing
first = false;
bcount -= chunk_remain;
for (; chunk_remain > 0; chunk_remain--) {
if (!i2c_wait_until_flag(priv, I2C_ISR_TXIS, 1)) {
dbg("TXIS TOUT, remain %d", (int)chunk_remain);
return false;
}
uint8_t byte = *bytes++;
LL_I2C_TransmitData8(priv->periph, byte);
}
}
if (!i2c_wait_until_flag(priv, I2C_ISR_STOPF, 1)) {
dbg("STOPF TOUT");
return false;
}
LL_I2C_ClearFlag_STOP(priv->periph);
return true;
}
static bool UU_I2C_Read(Unit *unit, uint16_t addr, uint8_t *dest, uint32_t bcount)
{
struct priv *priv = unit->data;
uint8_t addrsize = (uint8_t) (((addr & 0x8000) == 0) ? 7 : 10);
addr &= 0x3FF;
uint32_t ll_addrsize = (addrsize == 7) ? LL_I2C_ADDRSLAVE_7BIT : LL_I2C_ADDRSLAVE_10BIT;
if (addrsize == 7) addr <<= 1; // 7-bit address must be shifted to left for LL to use it correctly
if (!i2c_wait_until_flag(priv, I2C_ISR_BUSY, 0)) {
dbg("BUSY TOUT");
return false;
}
bool first = true;
uint32_t n = 0;
while (bcount > 0) {
if (!first) {
if (!i2c_wait_until_flag(priv, I2C_ISR_TCR, 1)) {
dbg("TCR TOUT");
return false;
}
}
uint8_t chunk_remain = (uint8_t) ((bcount > 255) ? 255 : bcount); // if more than 255, first chunk is 255
LL_I2C_HandleTransfer(priv->periph, addr, ll_addrsize, chunk_remain,
(bcount > 255) ? LL_I2C_MODE_RELOAD : LL_I2C_MODE_AUTOEND, // Autoend if this is the last chunk
first ? LL_I2C_GENERATE_START_READ : LL_I2C_GENERATE_NOSTARTSTOP); // no start/stop condition if we're continuing
first = false;
bcount -= chunk_remain;
for (; chunk_remain > 0; chunk_remain--) {
if (!i2c_wait_until_flag(priv, I2C_ISR_RXNE, 1)) {
dbg("RXNE TOUT");
return false;
}
uint8_t byte = LL_I2C_ReceiveData8(priv->periph);
*dest++ = byte;
}
}
if (!i2c_wait_until_flag(priv, I2C_ISR_STOPF, 1)) {
dbg("STOPF TOUT");
return false;
}
LL_I2C_ClearFlag_STOP(priv->periph);
return true;
}
/** Handle a request message */
static bool UI2C_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
{
struct priv *priv = unit->data;
uint16_t addr;
uint32_t len;
// 10-bit address has the highest bit set to 1 to indicate this
uint8_t regnum; // register number
uint32_t size; // register width
switch (command) {
case CMD_WRITE:
addr = pp_u16(pp);
const uint8_t *bb = pp_tail(pp, &len);
if (!UU_I2C_Write(unit, addr, bb, len)) {
com_respond_err(frame_id, "TX FAIL");
return false;
}
break;
case CMD_READ:
addr = pp_u16(pp);
len = pp_u16(pp);
if (!UU_I2C_Read(unit, addr, (uint8_t *) unit_tmp512, len)) {
com_respond_err(frame_id, "RX FAIL");
return false;
}
com_respond_buf(frame_id, MSG_SUCCESS, (uint8_t *) unit_tmp512, len);
break;
case CMD_READ_REG:;
addr = pp_u16(pp);
regnum = pp_u8(pp); // register number
size = pp_u8(pp); // total number of bytes to read (allows use of auto-increment)
if (!UU_I2C_Write(unit, addr, &regnum, 1)) {
com_respond_err(frame_id, "REG ADDR TX FAIL");
return false;
}
// we read the register as if it was a unsigned integer
if (!UU_I2C_Read(unit, addr, (uint8_t *) unit_tmp512, size)) {
com_respond_err(frame_id, "REG VAL RX FAIL");
return false;
}
// and pass it to PC to handle
com_respond_buf(frame_id, MSG_SUCCESS, (uint8_t *) unit_tmp512, size);
break;
case CMD_WRITE_REG:
addr = pp_u16(pp);
regnum = pp_u8(pp); // register number
PayloadBuilder pb = pb_start((uint8_t*)unit_tmp512, 512, NULL);
pb_u8(&pb, regnum);
const uint8_t *tail = pp_tail(pp, &size);
pb_buf(&pb, tail, size);
if (!UU_I2C_Write(unit, addr, (uint8_t *) unit_tmp512, pb_length(&pb))) {
com_respond_err(frame_id, "REG WRT FAIL");
return false;
}
break;
default:
com_respond_bad_cmd(frame_id);
return false;
}
return true;
}
// ------------------------------------------------------------------------
/** Unit template */
const UnitDriver UNIT_I2C = {
.name = "I2C",
.description = "I2C master",
// Settings
.preInit = UI2C_preInit,
.cfgLoadBinary = UI2C_loadBinary,
.cfgWriteBinary = UI2C_writeBinary,
.cfgLoadIni = UI2C_loadIni,
.cfgWriteIni = UI2C_writeIni,
// Init
.init = UI2C_init,
.deInit = UI2C_deInit,
// Function
.handleRequest = UI2C_handleRequest,
};