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gex-core/units/i2c/_i2c_init.c

160 lines
3.8 KiB

//
// Created by MightyPork on 2018/02/03.
//
#include "platform.h"
#include "unit_base.h"
#define I2C_INTERNAL
#include "_i2c_internal.h"
/** Allocate data structure and set defaults */
error_t UI2C_preInit(Unit *unit)
{
struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
if (priv == NULL) return E_OUT_OF_MEM;
// some defaults
priv->periph_num = 1;
priv->speed = 1;
priv->anf = true;
priv->dnf = 0;
return E_SUCCESS;
}
/** Finalize unit set-up */
error_t UI2C_init(Unit *unit)
{
bool suc = true;
struct priv *priv = unit->data;
if (!(priv->periph_num >= 1 && priv->periph_num <= 2)) {
dbg("!! Bad I2C periph"); // TODO report
return E_BAD_CONFIG;
}
if (!(priv->speed >= 1 && priv->speed <= 3)) {
dbg("!! Bad I2C speed");
return E_BAD_CONFIG;
}
if (priv->dnf > 15) {
dbg("!! Bad I2C DNF bw");
return E_BAD_CONFIG;
}
// assign and claim the peripheral
if (priv->periph_num == 1) {
TRY(rsc_claim(unit, R_I2C1));
priv->periph = I2C1;
} else {
TRY(rsc_claim(unit, R_I2C2));
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 STM32F072xB
// scl - 6 or 8 for I2C1, 10 for I2C2
// sda - 7 or 9 for I2C1, 11 for I2C2
if (priv->periph_num == 1) {
// I2C1
if (priv->remap == 0) {
af_i2c = LL_GPIO_AF_1;
portname = 'B';
pin_scl = 6;
pin_sda = 7;
} else if (priv->remap == 1) {
af_i2c = LL_GPIO_AF_1;
portname = 'B';
pin_scl = 8;
pin_sda = 9;
} else {
return E_BAD_CONFIG;
}
} else {
// I2C2
if (priv->remap == 0) {
af_i2c = LL_GPIO_AF_1;
portname = 'B';
pin_scl = 10;
pin_sda = 11;
} else if (priv->remap == 1) {
af_i2c = LL_GPIO_AF_5;
portname = 'B';
pin_scl = 13;
pin_sda = 14;
} else {
return E_BAD_CONFIG;
}
}
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
TRY(rsc_claim_pin(unit, portname, pin_sda));
TRY(rsc_claim_pin(unit, portname, pin_scl));
TRY(hw_configure_gpio_af(portname, pin_sda, af_i2c));
TRY(hw_configure_gpio_af(portname, pin_scl, af_i2c));
hw_periph_clock_enable(priv->periph);
/* 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 E_SUCCESS;
}
/** Tear down the unit */
void UI2C_deInit(Unit *unit)
{
struct priv *priv = unit->data;
// de-init the pins & peripheral only if inited correctly
if (unit->status == E_SUCCESS) {
assert_param(priv->periph);
LL_I2C_DeInit(priv->periph);
hw_periph_clock_disable(priv->periph);
}
// Release all resources
rsc_teardown(unit);
// Free memory
free_ck(unit->data);
}