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160 lines
3.8 KiB
160 lines
3.8 KiB
//
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// Created by MightyPork on 2018/02/03.
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//
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#include "platform.h"
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#include "unit_base.h"
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#define I2C_INTERNAL
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#include "_i2c_internal.h"
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/** Allocate data structure and set defaults */
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error_t UI2C_preInit(Unit *unit)
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{
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struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
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if (priv == NULL) return E_OUT_OF_MEM;
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// some defaults
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priv->periph_num = 1;
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priv->speed = 1;
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priv->anf = true;
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priv->dnf = 0;
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return E_SUCCESS;
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}
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/** Finalize unit set-up */
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error_t UI2C_init(Unit *unit)
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{
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bool suc = true;
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struct priv *priv = unit->data;
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if (!(priv->periph_num >= 1 && priv->periph_num <= 2)) {
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dbg("!! Bad I2C periph"); // TODO report
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return E_BAD_CONFIG;
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}
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if (!(priv->speed >= 1 && priv->speed <= 3)) {
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dbg("!! Bad I2C speed");
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return E_BAD_CONFIG;
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}
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if (priv->dnf > 15) {
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dbg("!! Bad I2C DNF bw");
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return E_BAD_CONFIG;
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}
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// assign and claim the peripheral
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if (priv->periph_num == 1) {
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TRY(rsc_claim(unit, R_I2C1));
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priv->periph = I2C1;
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} else {
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TRY(rsc_claim(unit, R_I2C2));
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priv->periph = I2C2;
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}
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// This is written for F072, other platforms will need adjustments
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char portname;
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uint8_t pin_scl;
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uint8_t pin_sda;
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uint32_t af_i2c;
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uint32_t timing; // magic constant from CubeMX
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#if STM32F072xB
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// scl - 6 or 8 for I2C1, 10 for I2C2
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// sda - 7 or 9 for I2C1, 11 for I2C2
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if (priv->periph_num == 1) {
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// I2C1
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if (priv->remap == 0) {
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af_i2c = LL_GPIO_AF_1;
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portname = 'B';
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pin_scl = 6;
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pin_sda = 7;
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} else if (priv->remap == 1) {
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af_i2c = LL_GPIO_AF_1;
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portname = 'B';
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pin_scl = 8;
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pin_sda = 9;
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} else {
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return E_BAD_CONFIG;
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}
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} else {
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// I2C2
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if (priv->remap == 0) {
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af_i2c = LL_GPIO_AF_1;
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portname = 'B';
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pin_scl = 10;
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pin_sda = 11;
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} else if (priv->remap == 1) {
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af_i2c = LL_GPIO_AF_5;
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portname = 'B';
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pin_scl = 13;
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pin_sda = 14;
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} else {
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return E_BAD_CONFIG;
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}
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}
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if (priv->speed == 1)
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timing = 0x00301D2B; // Standard
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else if (priv->speed == 2)
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timing = 0x0000020B; // Fast
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else
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timing = 0x00000001; // Fast+
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#elif GEX_PLAT_F103_BLUEPILL
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#error "NO IMPL"
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#elif GEX_PLAT_F303_DISCOVERY
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#error "NO IMPL"
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#elif GEX_PLAT_F407_DISCOVERY
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#error "NO IMPL"
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#else
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#error "BAD PLATFORM!"
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#endif
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// first, we have to claim the pins
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TRY(rsc_claim_pin(unit, portname, pin_sda));
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TRY(rsc_claim_pin(unit, portname, pin_scl));
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TRY(hw_configure_gpio_af(portname, pin_sda, af_i2c));
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TRY(hw_configure_gpio_af(portname, pin_scl, af_i2c));
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hw_periph_clock_enable(priv->periph);
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/* Disable the selected I2Cx Peripheral */
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LL_I2C_Disable(priv->periph);
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LL_I2C_ConfigFilters(priv->periph,
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(priv->anf ? LL_I2C_ANALOGFILTER_ENABLE : LL_I2C_ANALOGFILTER_DISABLE),
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priv->dnf);
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LL_I2C_SetTiming(priv->periph, timing);
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//LL_I2C_DisableClockStretching(priv->periph);
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LL_I2C_Enable(priv->periph);
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LL_I2C_DisableOwnAddress1(priv->periph); // OA not used
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LL_I2C_SetMode(priv->periph, LL_I2C_MODE_I2C); // not using SMBus
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return E_SUCCESS;
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}
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/** Tear down the unit */
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void UI2C_deInit(Unit *unit)
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{
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struct priv *priv = unit->data;
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// de-init the pins & peripheral only if inited correctly
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if (unit->status == E_SUCCESS) {
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assert_param(priv->periph);
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LL_I2C_DeInit(priv->periph);
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hw_periph_clock_disable(priv->periph);
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}
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// Release all resources
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rsc_teardown(unit);
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// Free memory
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free_ck(unit->data);
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}
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