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gex-core/units/usart/_usart_init.c

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//
// Created by MightyPork on 2018/01/14.
//
#include "platform.h"
#include "unit_base.h"
#define UUSART_INTERNAL
#include "_usart_internal.h"
extern error_t UUSART_ClaimDMAs(Unit *unit);
extern error_t UUSART_SetupDMAs(Unit *unit);
extern void UUSART_DeInitDMAs(Unit *unit);
/** Allocate data structure and set defaults */
error_t UUSART_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->remap = 0;
priv->baudrate = 115200;
priv->parity = 0; //!< 0-none, 1-odd, 2-even
priv->stopbits = 1; //!< 0-half, 1-one, 2-1.5, 3-two
priv->direction = UUSART_DIRECTION_RXTX; // RXTX
priv->hw_flow_control = false;
priv->clock_output = false;
priv->cpol = 0;
priv->cpha = 0;
priv->lsb_first = true; // LSB first is default for UART
priv->width = 8;
priv->data_inv = false;
priv->rx_inv = false;
priv->tx_inv = false;
priv->de_output = false;
priv->de_polarity = 1; // active high
// this should equal to a half-byte length when oversampling by 16 is used (default)
priv->de_assert_time = 8;
priv->de_clear_time = 8;
return E_SUCCESS;
}
/** Claim the peripheral and assign priv->periph */
static inline error_t UUSART_claimPeriph(Unit *unit)
{
struct priv *priv = unit->data;
if (!(priv->periph_num >= 1 && priv->periph_num <= 5)) {
dbg("!! Bad USART periph");
return E_BAD_CONFIG;
}
// assign and claim the peripheral
if (priv->periph_num == 1) {
TRY(rsc_claim(unit, R_USART1));
priv->periph = USART1;
}
else if (priv->periph_num == 2) {
TRY(rsc_claim(unit, R_USART2));
priv->periph = USART2;
}
else if (priv->periph_num == 3) {
TRY(rsc_claim(unit, R_USART3));
priv->periph = USART3;
}
#if defined(USART4)
else if (priv->periph_num == 4) {
TRY(rsc_claim(unit, R_USART4));
priv->periph = USART4;
}
#endif
#if defined(USART5)
else if (priv->periph_num == 5) {
TRY(rsc_claim(unit, R_USART5));
priv->periph = USART5;
}
#endif
else return E_BAD_CONFIG;
TRY(UUSART_ClaimDMAs(unit));
return E_SUCCESS;
}
/** Claim and configure GPIOs used */
static inline error_t UUSART_configPins(Unit *unit)
{
struct priv *priv = unit->data;
// This is written for F072, other platforms will need adjustments
// Configure UART pins (AF)
#define want_ck_pin(priv) ((priv)->clock_output)
#define want_tx_pin(priv) (bool)((priv)->direction & 2)
#define want_rx_pin(priv) (bool)((priv)->direction & 1)
#define want_cts_pin(priv) ((priv)->hw_flow_control==2 || (priv)->hw_flow_control==3)
#define want_rts_pin(priv) ((priv)->de_output || (priv)->hw_flow_control==1 || (priv)->hw_flow_control==3)
/* List of required pins based on the user config */
bool pins_wanted[5] = {
want_ck_pin(priv),
want_tx_pin(priv),
want_rx_pin(priv),
want_cts_pin(priv),
want_rts_pin(priv)
};
#if GEX_PLAT_F072_DISCOVERY
const struct PinAF *mappings = NULL;
// TODO adjust this, possibly remove / split to individual pin config for ..
// the final board
const struct PinAF mapping_1_0[5] = {
{'A', 8, LL_GPIO_AF_1}, // CK
{'A', 9, LL_GPIO_AF_1}, // TX
{'A', 10, LL_GPIO_AF_1}, // RX
{'A', 11, LL_GPIO_AF_1}, // CTS - collides with USB
{'A', 12, LL_GPIO_AF_1}, // RTS - collides with USB
};
const struct PinAF mapping_1_1[5] = {
{'A', 8, LL_GPIO_AF_1}, // CK*
{'B', 6, LL_GPIO_AF_1}, // TX
{'B', 7, LL_GPIO_AF_1}, // RX
{'A', 11, LL_GPIO_AF_1}, // CTS* - collides with USB
{'A', 12, LL_GPIO_AF_1}, // RTS* - collides with USB
};
const struct PinAF mapping_2_0[5] = {
{'A', 4, LL_GPIO_AF_1}, // CK
{'A', 2, LL_GPIO_AF_1}, // TX
{'A', 3, LL_GPIO_AF_1}, // RX
{'A', 0, LL_GPIO_AF_1}, // CTS
{'A', 1, LL_GPIO_AF_1}, // RTS
};
const struct PinAF mapping_2_1[5] = {
{'A', 4, LL_GPIO_AF_1}, // CK*
{'A', 14, LL_GPIO_AF_1}, // TX
{'A', 15, LL_GPIO_AF_1}, // RX
{'A', 0, LL_GPIO_AF_1}, // CTS*
{'A', 1, LL_GPIO_AF_1}, // RTS*
};
const struct PinAF mapping_3_0[5] = {
{'B', 12, LL_GPIO_AF_4}, // CK
{'B', 10, LL_GPIO_AF_4}, // TX
{'B', 11, LL_GPIO_AF_4}, // RX
{'B', 13, LL_GPIO_AF_4}, // CTS
{'B', 14, LL_GPIO_AF_4}, // RTS
};
const struct PinAF mapping_4_0[5] = {
{'C', 12, LL_GPIO_AF_0}, // CK
{'A', 0, LL_GPIO_AF_4}, // TX
{'A', 1, LL_GPIO_AF_4}, // RX
{'B', 7, LL_GPIO_AF_4}, // CTS
{'A', 15, LL_GPIO_AF_4}, // RTS
};
const struct PinAF mapping_4_1[5] = {
{'C', 12, LL_GPIO_AF_0}, // CK*
{'C', 10, LL_GPIO_AF_0}, // TX
{'C', 11, LL_GPIO_AF_0}, // RX
{'B', 7, LL_GPIO_AF_4}, // CTS*
{'A', 15, LL_GPIO_AF_4}, // RTS*
};
if (priv->periph_num == 1) {
// USART1
if (priv->remap == 0) mappings = &mapping_1_0[0];
else if (priv->remap == 1) mappings = &mapping_1_1[0];
else return E_BAD_CONFIG;
}
else if (priv->periph_num == 2) {
// USART2
if (priv->remap == 0) mappings = &mapping_2_0[0];
else if (priv->remap == 1) mappings = &mapping_2_1[0];
else return E_BAD_CONFIG;
}
else if (priv->periph_num == 3) {
// USART3
if (priv->remap == 0) mappings = &mapping_3_0[0];
else return E_BAD_CONFIG;
}
else if (priv->periph_num == 4) {
// USART3
if (priv->remap == 0) mappings = &mapping_4_0[0];
else if (priv->remap == 1) mappings = &mapping_4_1[0];
else return E_BAD_CONFIG;
}
else return E_BAD_CONFIG;
// Apply mappings based on the 'wanted' table
for (int i = 0; i < 5; i++) {
if (pins_wanted[i]) {
if (mappings[i].port == 0) return E_BAD_CONFIG;
TRY(rsc_claim_pin(unit, mappings[i].port, mappings[i].pin));
TRY(hw_configure_gpio_af(mappings[i].port, mappings[i].pin, mappings[i].af));
}
}
#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
return E_SUCCESS;
}
/** Finalize unit set-up */
error_t UUSART_init(Unit *unit)
{
struct priv *priv = unit->data;
TRY(UUSART_claimPeriph(unit));
TRY(UUSART_configPins(unit));
// --- Configure the peripheral ---
// Enable clock for the peripheral used
hw_periph_clock_enable(priv->periph);
LL_USART_Disable(priv->periph);
{
LL_USART_DeInit(priv->periph);
LL_USART_SetBaudRate(priv->periph, PLAT_APB1_HZ, LL_USART_OVERSAMPLING_16, priv->baudrate);
LL_USART_SetParity(priv->periph,
priv->parity == 0 ? LL_USART_PARITY_NONE :
priv->parity == 1 ? LL_USART_PARITY_ODD
: LL_USART_PARITY_EVEN);
LL_USART_SetStopBitsLength(priv->periph,
priv->stopbits == 0 ? LL_USART_STOPBITS_0_5 :
priv->stopbits == 1 ? LL_USART_STOPBITS_1 :
priv->stopbits == 2 ? LL_USART_STOPBITS_1_5
: LL_USART_STOPBITS_2);
LL_USART_SetTransferDirection(priv->periph,
(priv->direction == UUSART_DIRECTION_RX) ? LL_USART_DIRECTION_RX :
(priv->direction == UUSART_DIRECTION_TX) ? LL_USART_DIRECTION_TX
: LL_USART_DIRECTION_TX_RX);
LL_USART_SetHWFlowCtrl(priv->periph,
priv->hw_flow_control == 0 ? LL_USART_HWCONTROL_NONE :
priv->hw_flow_control == 1 ? LL_USART_HWCONTROL_RTS :
priv->hw_flow_control == 2 ? LL_USART_HWCONTROL_CTS
: LL_USART_HWCONTROL_RTS_CTS);
LL_USART_ConfigClock(priv->periph,
priv->cpha ? LL_USART_PHASE_2EDGE : LL_USART_PHASE_1EDGE,
priv->cpol ? LL_USART_POLARITY_HIGH : LL_USART_POLARITY_LOW,
true); // clock on last bit - TODO configurable?
if (priv->clock_output)
LL_USART_EnableSCLKOutput(priv->periph);
else
LL_USART_DisableSCLKOutput(priv->periph);
LL_USART_SetTransferBitOrder(priv->periph,
priv->lsb_first ? LL_USART_BITORDER_LSBFIRST
: LL_USART_BITORDER_MSBFIRST);
LL_USART_SetDataWidth(priv->periph,
priv->width == 7 ? LL_USART_DATAWIDTH_7B :
priv->width == 8 ? LL_USART_DATAWIDTH_8B
: LL_USART_DATAWIDTH_9B);
LL_USART_SetBinaryDataLogic(priv->periph,
priv->data_inv ? LL_USART_BINARY_LOGIC_NEGATIVE
: LL_USART_BINARY_LOGIC_POSITIVE);
LL_USART_SetRXPinLevel(priv->periph, priv->rx_inv ? LL_USART_RXPIN_LEVEL_INVERTED
: LL_USART_RXPIN_LEVEL_STANDARD);
LL_USART_SetTXPinLevel(priv->periph, priv->tx_inv ? LL_USART_TXPIN_LEVEL_INVERTED
: LL_USART_TXPIN_LEVEL_STANDARD);
if (priv->de_output)
LL_USART_EnableDEMode(priv->periph);
else
LL_USART_DisableDEMode(priv->periph);
LL_USART_SetDESignalPolarity(priv->periph,
priv->de_polarity ? LL_USART_DE_POLARITY_HIGH
: LL_USART_DE_POLARITY_LOW);
LL_USART_SetDEAssertionTime(priv->periph, priv->de_assert_time);
LL_USART_SetDEDeassertionTime(priv->periph, priv->de_clear_time);
// Prepare for DMA
LL_USART_ClearFlag_TC(priv->periph);
LL_USART_EnableDMAReq_RX(priv->periph);
LL_USART_EnableDMAReq_TX(priv->periph);
}
LL_USART_Enable(priv->periph);
// modifies some usart registers that can't be modified when enabled
TRY(UUSART_SetupDMAs(unit));
// timeout based on the baudrate
unit->tick_interval = (uint16_t) ((50 * 1000) / priv->baudrate); // receive timeout (ms)
if (unit->tick_interval < 5) unit->tick_interval = 5;
return E_SUCCESS;
}
/** Tear down the unit */
void UUSART_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_USART_DeInit(priv->periph);
// Disable clock
hw_periph_clock_disable(priv->periph);
UUSART_DeInitDMAs(unit);
}
// Release all resources
rsc_teardown(unit);
// Free memory
free_ck(unit->data);
unit->data = NULL;
}